Dissertations / Theses: 'Maintenance'

1

Khuncumchoo, Non. "Roof Maintenance Record Analysis Toward Proactive Maintenance Policies." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14506.

Full text

Abstract:

The objective of this study is to propose an approach that assists facility managers in obtaining the needed information to establish a proactive roof maintenance plan. Two main methodologies are used in this research. The first approach, Historical Maintenance Data Analysis (HMDA), investigates and pinpoints the root cause of roof leaks by thoroughly collecting and analyzing roof maintenance records. HMDA hypothesizes that a mathematical model can be developed to reveal relationships between potential roof leak causes and leak incidences. The second approach, Roof Service Life Prediction (RSLP), investigates the applicability of the Factor Method in roof maintenance. The use of RSLP for leak predictions is based on the assumption that the first-time leak has a linear relationship with the estimated service life (ESL) of the roof. This research demonstrates that roof maintenance records can be used to predict and identify major factors that are likely causes of roof leaks in a mathematical causal model. Roof leaks are not totally random events and can be predicted. In this study, three parameters (Age, Workmanship, and Roof Repair) have a significant impact on the roof leaks probability within the first three years of a roof life. A unit change of workmanship and roofs age increases the odds of a roof leak. On the other hand, changes in roof repair decrease the odds of a roof leak. The Factor Method performed in the RSLP confirms the existence of a relationship between the ESL and the first-time leak. The correlations discovered are positive and significant to highly significant. The extents of correlation are found to be low to medium. The finding also illustrates a relatively simple and useful factor method technique that can be applied to the roof maintenance decision-making process. The estimated service life of a roof provides a reasonable estimation of a maintenance-free period. When ESL information is used in conjunction with knowledge obtained from HMDA, the new synthesis of knowledge will expand the facility maintenance professionals ability to develop and schedule a proactive roof maintenance plan.

APA, Harvard, Vancouver, ISO, and other styles

2

Amin, R. A. "Condition-based maintenance : innovation in building maintenance management." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1513270/.

Full text

Abstract:

Maintenance is a continuous process implemented by Facilities Management (FM) providers as one their core competences to effectively manage and maintain critical assets throughout the whole life of a building and prevent downtime of essential systems. Maintenance actions are usually categorised into two main streams: corrective (CM) and precautionary (PM). In CM equipment is repaired after a failure occurs (i.e. reactively). In contrast, PM is applied based on a fixed-time or age-schedule (i.e. preventive). However, a subdivision of PM that is widely discussed in literature, yet rarely implemented in practice within FM, is Condition-based Maintenance (CBM), which enables maintenance to be applied predictively. CBM exploits the operating condition of equipment to predict a failure occurrence, thus preventing any unexpected downtime and reducing maintenance cost by avoiding unnecessary preventive actions. The underlining theory of CBM is based on the belief that 99 per cent of equipment will evidence some sort of indicators prior to failure. Therefore, it is possible to identify the fault, determine the cause and establish the severity and longevity of the equipment’s optimum life through monitoring and evaluating data collected through various techniques. Nevertheless, although the theoretical foundations of CBM are relevant to building maintenance management, such data and technology-focused strategies are seldom considered to be a viable and feasible option within the FM strategy. Therefore, this thesis details a mixedmethods, action research project undertaken within this industry sector, which has been significantly suppressed of innovative contributions. The study investigates the viability, practicality and impact of implementing an innovative CBM focused maintenance framework that is inclusive of real-time vibration analysis and enhanced with statistical data analysis. The CBM framework is demonstrated to be economically viable, technically feasible and complimentary to the inadequacies of the existing time-based regime. The framework adds value to the buildings maintenance management objectives.

APA, Harvard, Vancouver, ISO, and other styles

3

Falkman, Elin. "Planned maintenance." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-94436.

Full text

Abstract:

This report contains a maintenance plan to a tenant-owners´ society who administers by Riksbyggen. The maintenance plan is an aid to the administrator and the house owner. It describes what you need to do on the building, when you need to do it and who much it cost. It is important to plan the future maintenance and be prepared to the maintenance expenses. You also get knowledge about the deposition of the year and are able to keep the charge down. Properties need external maintenance of the ground, external and internally maintenance of the building and maintenance of installations and machines in the house. The maintenance can be neglected if you don´t look after the property. Examinations of Sweden´s present-day resident indicate that the maintenance is neglected.
Rapporten innefattar en underhållsplan till en bostadsrättsförening som förvaltas av Riksbyggen. Underhållsplanen är ett hjälpmedel till fastighetsägare och förvaltare som beskriver vad som behöver göras, när det ska göras och kostnaden på det som ska åtgärdas i fastigheten. Det har stor betydelse att kunna planera det kommande underhållet så man är förberedd på kommande underhållskostnader. Man får även kännedom om det årliga avsättningsbehovet och kan därefter skapa en god boendekostnad. Fastigheter kräver utvändigt underhåll av marken, utvändigt och invändigt underhåll av byggnaden samt underhåll av installationer och maskiner i byggnaden. Sköts inte underhållsarbetet finns det risk för att det blir eftersatt. Undersökningar om bostadsbeståndets nuvarande skick i landet påvisar att det finns eftersatt underhåll och att det förmodligen kommer att öka i framtiden.

APA, Harvard, Vancouver, ISO, and other styles

4

Haglund, Johan, and Fabian Syrén. "Efficient maintenance." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-95141.

Full text

Abstract:

Rapporten innefattar ett förslag till Riksbyggen på en mer lättförstålig underhållsplan, manual till datorprogrammet Summarum, samt några övriga arbeten som relaterar till underhållsarbetet. Tillvägagångssättet för att utforma underhållsplan och manualen har varit genom intervjuer, med berörda parter, som sedan analyserats. Resultaten visas i bifogade bilagor, bilaga 2 (underhållsplan) och bilaga 3 (manual). Genom intervjuerna har det framgått att man tyckt att underhållsplanen varit rörig och saknat viss information. För att avhjälpa problemet har det endast behövts små justeringar då den befintliga underhållsplanens innehåll var god. Det största problemet ligger inte i underhållsplanen utan svikande kunskap i användandet av den.
This report contains a proposal to Riksbyggen on a more simplified maintenance plan, a manual to the computer program Summarum and some other changes relating to the maintenance plan. The approach to designing the maintenance plan and the manual was trough interviews with affected parties, which was then analyzed. The result is shown in the attachments, enclosure 2(maintenance plan) and enclosure 3(manual). We have trough the interviews realized that the affected parties thought the maintenance plan was hard to understand, with some information missing. To fix this problem we only had to do some small changes to the maintenance plan, as we realized there was more of a problem in the customer’s knowledge in maintenance.

APA, Harvard, Vancouver, ISO, and other styles

5

Seifert, Fanny. "Smart Maintenance." Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV, 2018. https://slub.qucosa.de/id/qucosa%3A32446.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Syce, Melvin. "Designing for maintenance." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/440.

Full text

Abstract:

This treatise is a study of the methodology and the thought processes followed when buildings are designed, in order to determine to what extent, if any, designers consider the need for buildings to be maintained long after they walk off site and part with the project. The concept of taking future maintenance requirements into account as part of the design process is referred to as “designing for maintenance” (DFM). It can be assumed that, from a professional perspective, designers must keep the client’s needs in mind when designing. Facilities managers face the challenge of balancing a budget with maintaining a functional building – a dream building would be a maintenance-free building. Armed with the knowledge of DFM it is hoped that future buildings will be designed in a manner that will facilitate maintenance, thereby achieving significant savings on the life cycle costing of buildings. Buys (2004) suggests that designers should adopt a more open-minded approach toward maintenance during the design stages of buildings. Maintenance, with reference to access, methods, material and funding, could benefit from this approach, with a positive effect on the life cycle costing of a building. In order of priority when starting a building project, the design process is at the top of the list. Because this process happens right at the outset of a project, it is important to address the level of maintenance awareness that goes into designing, at this stage. The research concludes that one of the methods which could have a permanent effect on designers’ awareness of DFM would be to include it in the subjects taught at schools where designers are trained. This idea was discussed with a number of lecturers in this field and they were all in favour of this approach. There is a perception that built environment practitioners and professionals such as architects and contractors in the various fields related to the built environment, often engage in their particular task as if they exist in isolation from the project as a whole and from the rest of the project team. However, it is becoming increasingly evident that all built environment aspects are interwoven and interlinked, and that all are part of a larger context. With reference to the built environment as a whole, no action or element exists in isolation from a larger web of activity. The challenge, to nurture within students an awareness of the range and interconnectedness of elements and processes that contribute to the holistic idea, rests with the educators in the design fields, because it is clear that the final impact of any project relies to a large extent on what was specified by the designers in terms of materials and construction methods. The impact of the world’s six billion inhabitants on the environment is clearly a critical issue but does little to influence the actions of most design professionals. Documented experiences should serve as valuable tools to guide designers towards making more educated decisions on building design. Built environment professionals should educate themselves about the range of issues involved in the analysis, design and production of the built environment and the interaction between these factors.

APA, Harvard, Vancouver, ISO, and other styles

7

Galloway, Alasdair. "Maintenance of hierarchy." Thesis, University of Glasgow, 1990. http://theses.gla.ac.uk/1972/.

Full text

Abstract:

This work considers how it is that company structures, based on hierarchy, are able to persist over time. This question, though simple, is basic to industrial society, since although business organizations do in general operate with sufficient cohesion to produce their goods/services for sale, the traditional hierarchical structure has on occasions come under attack. Our aim will be to establish and understand the conditions under which hierarchy is able to persist - or conversely, under what conditions we might expect it to come apart. Our consideration does not however, preclude the possibility that the attack on hierarchy is more apparent than real - that any attack is at the level of limited ideology rather than social praxis. Hence it will be our position that we shall suspend belief in the persistence of the hierarchical structure and in this way be able to consider the conditions both for its persistence, and also for any challenge to be made to it. By pursuing the initial problem in this way we do not preclude the possibility of either 1) the permanence of hierarchy, or 2) the inevitability of its replacement with more/less democratic structures. Our aim is to understand the conditions for the persistence of hierarchical structures, and by implication the conditions under which they may be challenged by more democratic structures. There are two important features to our theoretical perspective: A) the process of knowledge selection to produce and structure expectations, B) a theory of power to structure the situation in which these expectations are made. In respect of the former we shall rely heavily on the work of Schutz, Habermas, and of Laing and Esterson, while for the latter we shall consider Lukes' three dimensional theory of power, developed from the perspective of Habermas, and in particular his Ideal Speech Thesis. This will result in a theory of the Lifeworld, which while substantially consistent with Schutz continues to establish in what respects the Lifeworld creates but conceals the possibility of the exercise of power. The importance of Schutz for us is that he provides a theoretical basis for knowledge creation for the individual social actor, and the structuring of knowledge into categories, which is consistent with our own view. We shall argue, however, that the view presented by Schutz does not take adequate account of the `restricting' or `limiting' aspects of the Lifeworld and the taken-for-grantedness (or uncritical attitude) which it sets up - that as Morgan's `Images' suggests the Lifeworld (as our `subjective stock of knowledge') can be a `Psychic Prison'. This argument in turn leads on to possible exercises of power of which the participants (ie power holder and subject) are not conscious. This will be developed by reference to Habermas's work. The importance of Lukes is his provision of an analytical framework for power, which recognises that power is a concept of greater variation than has been realised. Lukes, however, does not make sufficiently clear the meaning - particularly at the empirical level - of his third ('radical') dimension of power. For this reason we shall introduce the thesis of ideal speech, put forward by Habermas, to clarify and extend Lukes' work in a manner which is theoretically and empirically stronger, and methodologically more practical. We shall use a synthesis of Lukes and Habermas as a basis for our analysis of the social situation in which expectations are a) structured b) developed as a project in a social situation. By bringing together these two elements (ie the Habermasian adaption of Schutz and Lukes) we shall argue that individuals make expectations on their company which they develop from their Lifeworld and its subjective stock of knowledge. This process of knowledge selection and development of expectations, analytically sets a number of issues which shall be important to us in considering whether there is the social asymmetry we suggested exists as a support to existing organizational structures: 1) the knowledge selected may be so structured as to forestall the development of particular expectations, or so constrain behaviour that, in either situation, the structure of the organization goes unchallenged. 2) expectations can only be satisfied in competition with others - hence interaction with other employees will be important and particularly the Lifeworld definition of these employees (for instance competition between Management and Hourly paid may be influenced by the definition which the latter make of the former). 3) expectations shall be arbitrated upon by the company decision-making system (ie by the individual/group who have the authority to make the decision in question). At a relatively superficial level we must consider the values of this individual/group - but we have to go still deeper to understand the conditions under which this authority is regarded as legitimate or conversely regarded as illegitimate. These issues are closely connected since the legitimacy and illegitimacy or the decision-making system are largely determined - in our model - by the selection of knowledge, part of which is constituted by one's experience and/or interaction with other employees, as well as wider social knowledge which is employed by defining and interpreting the behaviour of others to develop expectations. Our perspective on this process is composed of two parts: 1) Employees make expectations of their company. 2) These expectations are generated in a process of experience and learning. We see no causal implications in this, but instead take the view that employees select from the knowledge available to them, in order to structure, guide and justify their behaviour. For instance this may be to A) justify the expectation of having more influence in their company's decision-making, and to indicate what would be appropriate behaviour to this end. Or alternatively B) indicate that this is not a reasonable expectation, and not a reasonable form of behaviour. Similarly the knowledge which is accessible can be employed to define and interpret the behaviour of relevant others in their own group and throughout the work situation -to account for, and explain what is happening, to foretell how to behave/not behave in the future. The process can, in other words, encourage or discourage the taking up of particular projects. Our particular interest is the dominance of hierarchy is maintained, restraining the development of more democratic organizational forms.

APA, Harvard, Vancouver, ISO, and other styles

8

Barlis, Alan Rainen. "Municipal maintenance facility." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/64537.

Full text

Abstract:

Thesis (M. Arch.)--Massachusetts Institute of Technology, Dept. of Architecture, 1997.
Includes bibliographical references (p. 93-94).
a structure is placed in tompkins square park it is part of a network of civic spaces intended for civil contribution. to the passer-by or the passer-through this distraction, this construction, occupied by some others involves me somehow. at the end near the branch library is a clustering of facilities facilities related to political activity, organizational offices, places for discussions ones begun by two people yesterday or ones on-going for generations by countless many ones that started in this area (neighborhood! community?) or somewhere else pressing issues, burning desires, casual comments, silent observations the right to speak nonsense. voices whether i listen or not, are there with or without mine but with consequence for me my absence will be noted with my presence, i will be held accountable.
by Alan Rainen Barlis.
M.Arch.

APA, Harvard, Vancouver, ISO, and other styles

9

Blackwelder, Reid B. "Maintenance of Certification." Digital Commons @ East Tennessee State University, 2005. https://dc.etsu.edu/etsu-works/6914.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Asp, Björn. "Maintenance Program development and the definition of the maintenance program process." Thesis, Mälardalen University, Department of Mathematics and Physics, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-628.

Full text

Abstract:

Under the economical pressure most airlines currently experiences, there is no margin to do too much or not enough of maintenance.

Customers’ demands high regularity, punctuality and safety. It is all about finding a balance in the maintenance program to be able to control costs and to deliver what the customers expect.

To actively work with the maintenance program and to continuously evaluate the same is of these reasons utterly important.

This report considers three methods and defines a process for working with optimization of maintenance intervals.

The study was carried out at Malmö Aviation, 2006-2007, the purpose was to establish a procedure for working with evaluation of Maintenance Program tasks based on conducted maintenance.

Under den starka ekonomiska press de flesta flygbolag befinner sig idag finns det inte marginaler att utföra för mycket eller för lite underhåll.

Kunderna kräver hög regularitet, punktlighet och säkerhet. Det gäller att hitta balans i underhållsprogrammet för att kunna kontrollera kostnaderna och leverera det kunderna förväntar sig.

Att aktivt arbeta med underhållsprogrammet och att kontinuerligt utvärdera detsamma är av dessa anledningar otroligt viktigt.

Detta arbete tar upp tre arbetssätt och definierar en process för arbete med optimering av underhålls intervall.

Studien utfördes på Malmö Aviation, 2006-2007, syftet var att ta fram en procedur för utvärdering av underhållsprogrammets uppgifter baserat på utfört underhåll.

APA, Harvard, Vancouver, ISO, and other styles

11

ROSA, OTÁVIO ARAUJO LEITÃO. "TEST-DRIVEN MAINTENANCE: AN APPROACH FOR THE MAINTENANCE OF LEGACY SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=18385@1.

Full text

Abstract:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Test-Driven Development é uma técnica de desenvolvimento de software baseada em pequenos ciclos que alternam entre a escrita de testes e a implementação da solução para que os testes sejam aprovados. O desenvolvimento orientado a testes vem apresentando excelentes resultados em diversos aspectos da construção de novos sistemas de software. Maior manutenibilidade, melhoria de design, redução da densidade de defeitos, maior documentação e maior cobertura do código são vantagens que contribuem para a diminuição do custo de desenvolvimento e, conseqüentemente, para a maximização do retorno sobre o investimento obtido quando adotamos a técnica. Todos esses benefícios têm contribuído para que Test- Driven Development se torne uma prática cada vez mais crítica na aplicação de metodologias ágeis no processo de desenvolvimento. Quando avaliamos a técnica, sob a ótica dos muitos sistemas legados existentes, nos deparamos com uma clara incompatibilidade para sua adoção neste contexto. Test-Driven Development parte da premissa de que os testes devem ser construídos antes do código e, quando trabalhamos com legados, já possuímos milhares de linhas escritas e funcionando. Diante deste cenário, apresentamos a técnica, que chamamos de Test-Driven Maintenance, resultado da adaptação de Test-Driven Development para o contexto de legados, detalhamos o processo de adaptação necessário para que chegássemos à forma descrita e realizamos uma avaliação das características da técnica original que se estenderam à técnica adaptada. Buscando obter resultados que fossem, de fato, aplicáveis, produzimos uma avaliação empírica baseada nos resultados obtidos na introdução da técnica em um sistema legado, em constante uso e evolução, de uma empresa do Rio de Janeiro.
Test-Driven Development is a software development technique based on quick cycles that switch between writing tests and implementing a solution that assures that tests do pass. Test-Driven Development has produced excellent results in various aspects of building new software systems. Increased maintainability, improved design, reduced defect density, better documentation and increased code test coverage are reported as advantages that contribute to reducing the cost of development and, consequently, to increasing return on investment. All these benefits have contributed for Test-Driven Development to become an increasingly relevant practice while developing software. When evaluating test driven development from the perspective of maintaining legacy systems, we face a clear mismatch when trying to adopt this technique. Test-Driven Development is based on the premise that tests should be written before coding, but when working with legacy code we already have thousands of lines written and running. Considering this context, we discuss in this dissertation a technique, which we call Test-Driven Maintenance, that is a result of adapting Test-Driven Development to the needs of maintaining legacy systems. We describe how we have performed the adaptation that lead us to this new technique. Afterwards, we evaluate the efficacy of the technique applying it to a realistic project. To obtain realistic evaluation results, we have performed an empirical study while introducing the technique in a maintenance team working on a legacy system that is in constant evolution and use by an enterprise in Rio de Janeiro.

APA, Harvard, Vancouver, ISO, and other styles

12

Scaglioso, Giovanni. "Modelling, simulation and optimization of maintenance considerations on condition based maintenance." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8308/.

Full text

Abstract:

Globalization has increased the pressure on organizations and companies to operate in the most efficient and economic way. This tendency promotes that companies concentrate more and more on their core businesses, outsource less profitable departments and services to reduce costs. By contrast to earlier times, companies are highly specialized and have a low real net output ratio. For being able to provide the consumers with the right products, those companies have to collaborate with other suppliers and form large supply chains. An effect of large supply chains is the deficiency of high stocks and stockholding costs. This fact has lead to the rapid spread of Just-in-Time logistic concepts aimed minimizing stock by simultaneous high availability of products. Those concurring goals, minimizing stock by simultaneous high product availability, claim for high availability of the production systems in the way that an incoming order can immediately processed. Besides of design aspects and the quality of the production system, maintenance has a strong impact on production system availability. In the last decades, there has been many attempts to create maintenance models for availability optimization. Most of them concentrated on the availability aspect only without incorporating further aspects as logistics and profitability of the overall system. However, production system operator’s main intention is to optimize the profitability of the production system and not the availability of the production system. Thus, classic models, limited to represent and optimize maintenance strategies under the light of availability, fail. A novel approach, incorporating all financial impacting processes of and around a production system, is needed. The proposed model is subdivided into three parts, maintenance module, production module and connection module. This subdivision provides easy maintainability and simple extendability. Within those modules, all aspect of production process are modeled. Main part of the work lies in the extended maintenance and failure module that offers a representation of different maintenance strategies but also incorporates the effect of over-maintaining and failed maintenance (maintenance induced failures). Order release and seizing of the production system are modeled in the production part. Due to computational power limitation, it was not possible to run the simulation and the optimization with the fully developed production model. Thus, the production model was reduced to a black-box without higher degree of details.

APA, Harvard, Vancouver, ISO, and other styles

13

Proença, Sara Salgueiro. "Organization of the maintenance : method to implement a maintenance management system and methodology for efficient maintenance on heavy machinery." Master's thesis, Instituto Politécnico de Setúbal. Escola Superior de Tecnologia de Setúbal, 2019. http://hdl.handle.net/10400.26/31375.

Full text

Abstract:

Relatório de Dissertação do Mestrado em Engenharia de Produção
Este trabalho dá início à construção de um método para implementação de um sistema de gestão da manutenção e é também um estudo de organização e disponibilidade de máquinas pesadas. A pesquisa tem como fundamento base a manutenção e todas as questões inerentes a esta. Irá descrever e salientar a importância da manutenção e resolução de problemas nos dias de hoje nas empresas. Para o sector específico da manutenção de máquinas pesadas, apresento uma proposta de organização com o objetivo de fazer melhor uso dos recursos humanos e materiais. O trabalho será apresentado como um estudo de caso geral. Perante os modelos existentes de manutenção, a realidade, o propósito / finalidade, princípios e ferramentas, apresento novas perspetivas de como atuar e desenvolver o trabalho que permita encontrar a melhor forma de fazer a gestão da manutenção eficiente e eficaz. No desenvolvimento do trabalho é importante conhecer todas as variáveis da manutenção porque apesar desta ser planeada podem existir e / ou verificar-se desvios do planeamento, o que acontece com alguma frequência. A criação de uma metodologia de implementação de um sistema tem como objetivo não só a sua implementação, mas também a eliminação de falhas e a procura da melhoria continua. Após conhecer bem a manutenção é tempo de começar uma nova pesquisa para o desenvolvimento do sistema em si. Na continuação deste trabalho, serão criados procedimentos e apoio à decisão, a fim de sustentar a organização da manutenção e o sistema de gestão da mesma. Este estudo foi realizado para três tipos de equipamentos: escavadora, máquina florestal e pá carregadora de rodas).
This paper is the beginning of the construction of a method for implementation of a maintenance management system and a study organization and availability of heavy machines. It is a research of base fundaments of maintenance and all the issues that arise from the maintenance. It will describe the importance of maintenance on these days to the companies and their problems with maintenance. A specific sector, maintenance of heavy machinery with the proposal to organized, to make better use of human and material resources, will be presented as a general case study. Given the maintenance models, the reality, the end of destination, principles and tools, a new perspective, how to act and develop the work in order to find the best ways to perform the maintenance management in an effective and efficient manner will arise. It is important to know all the variables of maintenance. Because even if maintenance is planned deflections of the plan can be possible and that happens very often. The creation of a methodology to the implementation of the system aims its implementation and therefore the elimination of waste and always looking for improvement. Now that we know well the maintenance the question is the time to begin a new research for the development of the system itself. On the continuing of this work procedures and decision supports will be created in order to sustain the maintenance organization and the maintenance management system focussing on specialised equipment’s (excavator, forest machine and wheel loader).

APA, Harvard, Vancouver, ISO, and other styles

14

Ararsa, Bete Birhanu. "Green Maintenance : A literature survey on the role of maintenance for sustainable manufacturing." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-15653.

Full text

Abstract:

A growing uncertainty in the global economy is forcing many manufacturers to reassess their corporate outlook towards the environment. Today there is a growing attention to sustainability in industry accompanied by a paradigm shift towards realizing a sustainable society. It is now very common to hear about Green Production and Green Systems, but few literature exist that deal with the relatively newer subject of Green Maintenance. The term green production is often used to describe production with a sustainable perspective. Also, lean production has been proposed as a means of achieving sustainability. Lean and Green production systems require efficient production and low use of resources such as energy, materials, etc. One major facilitator of this is effective maintenance. Sometimes regarded as the necessary evil, maintenance still has a negative image in the industry. But as the paradigm on manufacturing shift towards realizing a sustainable society, we should also begin to realize the changing role of maintenance. Still, the impact of maintenance on sustainability and Green production is not very well described in research. This Master Thesis within the School of Innovation Design and Engineering at Mälardalen University presents a literature review on green maintenance by trying to identify and assess the key factors of maintenance effects on green production, life cycle assessment and sustainability of maintenance activities. In addition, a brief introduction to the greening of remanufacturing activity, part of a green process by itself, is provided. The research is based upon extensive literature study, questionnaire survey and interviews with relevant industry as well as academic personnel. A discussion of the results of the interview followed by a conclusion on the key factors of maintenance on sustainability is provided. Future research areas have also been suggested. Keywords: Green maintenance, Production maintenance, Sustainable maintenance, Total Productive Maintenance

APA, Harvard, Vancouver, ISO, and other styles

15

Williamsson, Ia. "Total Quality Maintenance (TQMain) A predictive and proactive maintenance concept for software." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2281.

Full text

Abstract:

This thesis describes an investigation of the possibility to apply a maintenance concept originally developed for the industry, on software maintenance. Today a large amount of software development models exist but not many of them treat maintenance as a part of the software life cycle. In most cases maintenance is depicted as an activity towards the end of the software life cycle. The high cost ascribed to software maintenance motivates for improvements. The maintenance concept TQMain proposed in this thesis distinguishes from other maintenance concepts by its use of preventive, predictive and proactive maintenance strategies. TQMain uses a common database to store real-time data from various departments and uses it for analyse and assessment to track the development of deviations in the condition of the production process and product quality at an early stage. A continuous cyclic improvement of the maintenance strategy is reached by comparing the data from the real-time measurements with data from the database. The ISO/IEC Software engineering – Product qualities is used as a source of empiric data to conclude that the correct quality characteristics are used for identifying software product quality and its characteristics and compare them with the characteristics of industrial product quality. The results presented are that in the conceptual outline of TQMain measures are obviously not the same as in software maintenance, but the aspect of product quality is common for both. The continuous cyclic improvement of the product quality that TQMain features together with the aspect of detecting potential failures before they occur would, judging from the conceptual outline of TQMain be applicable on software maintenance.

APA, Harvard, Vancouver, ISO, and other styles

16

Boznos, Dimitrios. "The use of computerised maintenance management systems to support team-based maintenance." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/11133.

Full text

Abstract:

With increasing competitive pressures in a global economy, manufacturing organisations are constantly looking for new methods to maximise efficiency and effectiveness, and hence profitability. Philosophies like Total Productive Maintenance (TPM), and Reliability-Centred Maintenance (RCM) have been employed to help companies achieve this aim, by focusing on the maintenance function and activities. As a result, in many such organisations, the manufacturing and production environments have changed dramatically. The modern maintenance model now revolves around empowered teams. This maintenance environment is also characterised by fewer engineers or craftspeople being required to be more productive. ln addition, more data, information, and knowledge are essential for attaining full technical and operational understanding of the plant, equipment and processes. Information technology is being called upon to assist in achieving a broad range of objectives in contemporary maintenance management. Computerised maintenance management systems (CMMS) in particular, are nowadays expected to facilitate teamwork, and support maintenance programmes based on the contemporary philosophies of TPM and RCM. This thesis investigates the design, as well as the use and application of CMMS in manufacturing industry. The main outcome provides the principal aspects and necessary features of CMMS that can successfully facilitate teamwork, and support TPM or RCM programmes across the whole manufacturing sector. The research was actually based on an extensive literature survey from a plethora of available information sources, as well as a manufacturing industry survey based on postal questionnaires and actual visits to manufacturing plants.

APA, Harvard, Vancouver, ISO, and other styles

17

Boznos, D. "The use of computerised maintenance management systems to support team-based maintenance." Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/11133.

Full text

Abstract:

With increasing competitive pressures in a global economy, manufacturing organisations are constantly looking for new methods to maximise efficiency and effectiveness, and hence profitability. Philosophies like Total Productive Maintenance (TPM), and Reliability-Centred Maintenance (RCM) have been employed to help companies achieve this aim, by focusing on the maintenance function and activities. As a result, in many such organisations, the manufacturing and production environments have changed dramatically. The modern maintenance model now revolves around empowered teams. This maintenance environment is also characterised by fewer engineers or craftspeople being required to be more productive. ln addition, more data, information, and knowledge are essential for attaining full technical and operational understanding of the plant, equipment and processes. Information technology is being called upon to assist in achieving a broad range of objectives in contemporary maintenance management. Computerised maintenance management systems (CMMS) in particular, are nowadays expected to facilitate teamwork, and support maintenance programmes based on the contemporary philosophies of TPM and RCM. This thesis investigates the design, as well as the use and application of CMMS in manufacturing industry. The main outcome provides the principal aspects and necessary features of CMMS that can successfully facilitate teamwork, and support TPM or RCM programmes across the whole manufacturing sector. The research was actually based on an extensive literature survey from a plethora of available information sources, as well as a manufacturing industry survey based on postal questionnaires and actual visits to manufacturing plants.

APA, Harvard, Vancouver, ISO, and other styles

18

Bergström, Anna. "Winter maintenance and cycleways." Doctoral thesis, KTH, Civil and Architectural Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3346.

Full text

Abstract:

Increasing cycling as a means of personal travel couldgenerate environmental benefits if associated with acorresponding decrease in car-based transport. In seeking topromote cycling in wintertime, it is desirable to understandhow important the road surface condition is compared to otherfactors in people's decision to cycle or not. In this thesis,the possibility of increasing the number of cyclists byimproving the winter maintenance servicelevel on cycleways isexamined. The attitudes towards cycling during winter ingeneral, and in relation to winter maintenance of cycleways inparticular, is studied through questionnaire surveys. Bicyclemeasurements are related to weather data from Road WeatherInformation System, in order to know the influence on cycleflow during winter from different weather factors. Fieldstudies are performed testing unconventional winter maintenancemethods, in order to see if a higher service level could beachieved on cycleways and if that would lead to an increase inwinter cycling frequency. The field studies are evaluatedthrough road condition observations, measurements of friction,bicycle counts, a questionnaire survey and interviews. A visualmethod to assess winter road conditions on cycleways isdeveloped, in order to compare the service levels achievedusing different winter maintenance methods.

There is a clear difference in mode choice between seasons.With improved winter maintenance service level it could bepossible to increase the number of bicycle trips to work duringwinter with, at the most, 18 %, and decrease the number of cartrips with 6 %. However, it could not be concluded with bicyclemeasurements, that an enhanced service level in fact, generateda higher winter cycling frequency.

To increase cycling during winter, snow clearance is themost important maintenance measure. Skid control is not assignificant for the choice of mode but is important to attendto for safety reasons. Winter road condition propertiesimportant both with regard to safety and accessibility ofcyclists, are icy tracks formed when wet snow freezes, snowdepths greater than about 3 cm of loose snow or slush,unevenness in a snow covered surface, loose grit on a baresurface.

Weather factors with negative influence on winter cyclingfrequency, are temperatures below +5 ° C,precipitationand strong winds. Only the occurrence of precipitation, not theamount of rain or snow, is significant for the cycle flow. Lowtemperatures are more important in reducing the cycle flow thanprecipitation. Temperatures around 0 ° C seem to be extracritical for cyclists, probably due to the larger influence ofprecipitation and slippery road conditions at thesetemperatures.

An unconventional method using a power broom for snowclearance and brine or pre-wetted salt for de-icing, provides ahigher service level than winter maintenance methodstraditionally used, but it is about 2 to 3 times moreexpensive. The method has great potential in regions, such assouthern Sweden, with low snow accumulations but with major iceformation problems. To assess the maintenance service level,the visual assessment method developed and tested in thisproject is adequate for the purpose, however, furtherimprovements are desirable. As a complement to the visualassessment, a Portable Friction Tester can be used to measurethe surface friction on cycleways during wintertime.

Keywords:Cycleways, winter maintenance, maintenanceservice level, mode choice, winter cycling frequency, wintermaintenance equipment, winter road condition assessment,bicycle measurements, friction measurement.

APA, Harvard, Vancouver, ISO, and other styles

19

Ruud, Niklas. "Computerized maintenance management system." Thesis, Linköping University, Machine Design, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-51343.

Full text

Abstract:

In this thesis have an implementation of a maintenance program called Computerized Maintenance Management System that has been developed together with the personal from SKF. The work has been conducted for 10 weeks at Sapa Thermal Heat Transfer (Shanghai) Ltd on the maintenance department. Sapa manufacture, sell and deliver to the automobile market. The goal has been to understand and learn how to use the new computer system CMMS. It shall help Sapa to save on doing unnecessary maintenance and make it easier to order spare part, scheduled maintenance and to see the problems and the solution the problems in the CMMS database. My report is limited to parts of the CMMS. The edge guides critical points that are the position transducer and the vertical roller bearing. I describe the failures that can occur and recommend some solutions to the problems. With the creation of different concepts, explanations are given to guide you to the right solution. I give a short introduction to the current maintenance in Sapa and how to update the database through the creating of a user manual directed to Sapa. Interviews have been conducted at Sapa maintenance department with SKF and API Pro personal. The biggest helping tool has been from the CMMS there I have been able to read about current problems with the edge guide. Fact has also been taken from the Internet and material provided by Sapa The report shows a few recommendations and helping tools for how to continue the update in the CMMS for the new hot mill. Optimize the maintenance to the smallest component with the goal of saving money and production time. The reason is that CMMS shall contribute to manage the maintenance so much that the machine should have availability above 90 percent.

APA, Harvard, Vancouver, ISO, and other styles

20

Salonen, Antti. "Formulation of Maintenance Strategies." Licentiate thesis, Mälardalen University, School of Innovation, Design and Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-4836.

Full text

Abstract:

In industry, there is a constant demand for increased productivity in order to stay competitive. Still, Swedish industry has an average utilization of about 60% in its production systems. One important factor for increasing the equipment utilization is effective maintenance of production assets.

Within process industry a strategic view on maintenance activities is common and most companies regard maintenance as a profit centre. Meanwhile, the discrete units manufacturing industry still in many cases view maintenance as a cost driver. However, with the spread of Toyota-inspired production concepts, the manufacturing industry is beginning to view maintenance as a strategic asset. Still, though, many companies have no formulated maintenance strategy.

The main purpose of the research, presented in this thesis, has been to develop a work-process for formulation of effective maintenance strategies for enterprises in the manufacturing industry.

Through one descriptive and two prescriptive case studies a work-process for formulation of maintenance strategies has been developed. The descriptive study revealed some of the differences between companies with and without maintenance strategies. It also showed how some companies view the strategic contributions of maintenance. The first prescriptive study showed how stakeholder involvement may contribute to the identification of relevant performance measures for the maintenance activities. Stakeholder involvement also contributes to the organizational acceptance of the maintenance strategy. Last, the second prescriptive case study led to the development of a work-process for formulation of maintenance strategies. The work-process was tested and verified in three companies, handling different challenges for their maintenance activities. All three companies intend to use the formulated maintenance strategy as a road map for the development of their production maintenance.

APA, Harvard, Vancouver, ISO, and other styles

21

Nyström, Birre. "Punctuality and railway maintenance." Licentiate thesis, Luleå, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26559.

Full text

Abstract:

Long and frequent train delays, striking many periodically make headlines. The question is raised: what might be done about it? The on-going deregulation of the Swedish railway, with more actors entering the market, contributes to the question's topicality. In this thesis, problems and symptoms concerning punctuality are described and analysed. Herein, punctuality is defined as the extent to which an event takes place when agreed, for example the agreement between passengers and the company selling the ticket, considering the event that the train arrives at a certain time. The terminology in use on punctuality-related entities is floating. Causes for unpunctuality are related to the infrastructure, locomotives, wagons and personnel. Herein, primarily failures related to infrastructure are discussed. Maintenance, i.e. correcting and preventing failures, together with the track, rolling stock, weather, driver, other personnel and the timetable determine how good the punctuality will be. To the ore and steel transports studied it is more important to limit the lengths of the transport times, rather than having high punctuality, i.e. adherence to timetable. Generally, for freight transports it is difficult to give an estimation of the cost for unpunctuality. To find the root cause of a delay is vital, as is identification of symptoms and triggering events, in order to be able to carry out appropriate actions. Often the information needed to do so is lacking in the Ofelia database for infrastructure failures. Comparisons between regions or over time are complexified by the varying policies on how failure coding is to be performed. To improve punctuality by learning from others is made more difficult by e.g. different countries employing different ways of denoting punctuality. In the transport chain of post in Norway, terms related to punctuality varied even more among stakeholders. They considered being informed on estimated time of arrival as important, but getting this information was, despite this, not among the quantified goals. Few requirements were quantified, despite this often being simple to do. The consequences of failure are important to consider, not only e.g. the number of failures. Studying the variation in transport time on different line sections might help in identifying problems, because coding of delays shorter than five minutes is not carried out in the Swedish railway. Such causes of delay include low contact wire voltage, minor problems with locomotives and slippery rails due to leaves on the track. Disadvantageously, this variation is masked in the case of heavy trains or steep and curvy lines. In a studied maintenance organisation, the indicators of maintenance measured the result of the entire maintenance process. In order to manage each sub process better, it is more advantageous to measure the performance of them individually. Considering the specific sub process that decides which maintenance actions are to be carried out, it only uses expenses for the action itself when deciding, not resulting future costs and punctuality. The indicators focus on measuring past performance, not on facilitating planning for the future. A design of information systems facilitating information usage from different functions of the organisation would facilitate informed decisions. Information concerning technology, traffic and economy need to be integrated.
Godkänd; 2005; 20061218 (haneit)

APA, Harvard, Vancouver, ISO, and other styles

22

Nyström, Birre. "Punctuality and railway maintenance /." Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/41.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Andersson, Matilda, and Fredrik Wandfelt. "Optimization of maintenance system." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104015.

Full text

Abstract:

This report presents an optimization of the allocation of maintenance resources for Air Navigation Service (ANS) equipment of which LFV is responsible for the maintenance. The purpose the authors have worked after is to research ways of minimizing travelling time linked to maintenance visits for ANS equipment, this report includes the suggestions where the maintenance facilities should be placed in order to minimize the total travelling time. The report describes the problem background and presents the customer, LFV. It includes a chapter on some of the theories used for facility location and routing, and also presents methods for reducing the total travelling time used for maintenance visits annually. The authors have worked with a given set of airports in Sweden. Information about the general work with maintenance as well as the annual demand of maintenance, including the frequency of visits, for each airport included in this project was received by Pär Oberger, the task expert and contact at LFV for this report. A model for facility location based on the p-median model have been created and used when solving the problem, it was written in AMPL and solved with the CPLEX solver. The model was modified with two additional constraints regulating the minimum annual working time and the maximum distance for one-way travelling. The authors deems that a solution with five facilities is better since the benefit of additional facilities, in term of lower total distance, do not compensate for the assumed cost of establishing them.

APA, Harvard, Vancouver, ISO, and other styles

24

Sankaranarayanan, Vairamayil. "Maintenance – Wind Energy Production." Thesis, Mälardalens högskola, Innovation och produktrealisering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-27620.

Full text

Abstract:

This thesis investigates issues like maintenance problems, key factors, maintenance challenges, maintenance solutions and practical difficulties in wind energy. In this case, surveys and interviews have been taken from several companies and maintenance experts, to find most prevailing problems and problem-solving methods since last few years. It helps to show, how the energy maintenance has been developed in past few years. Also it analyses the impact of fourth generation maintenance in wind energy production. From research questions, key factors involved in wind energy maintenance provides us with valuable suggestions to develop the maintenance methods in future vision.

APA, Harvard, Vancouver, ISO, and other styles

25

Taylor, Mark John. "Methodologies and software maintenance." Thesis, University of Salford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265393.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

McGinley, Susan. "Studying Low Maintenance Turf." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1993. http://hdl.handle.net/10150/622365.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Shockley, Keith J. "Intelligent Maintenance Aid (IMA)." Thesis, Monterey, California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/2719.

Full text

Abstract:

Technological complexities of current ground combat systems require advanced maintenance methods to keep the fleet in a state of operational readiness. Currently, maintenance personnel use paper Technical Manuals (TM) that are cumbersome and not easily transportable or updated in the field. This thesis proposes using the latest technology to support maintainers in the field or depot by integrating the TMs with the onboard diagnostics Built-In-Test (BIT) and Fault Isolation Test (FIT) of the vehicle, to provide the maintainer with an improved diagnostics tool to expedite troubleshooting analysis. This will be accomplished by connecting the vehicle, using the vehicle's 1553 multiplex bus, with the Graphical User Interface (GUI) of an Intelligent Maintenance Aid (IMA). The IMA will use Troubleshooting Procedure (TP) codes generated during BIT and FIT testing. Using the information provided by these TP codes, through the IMA GUI, information from the technical manuals will be displayed to aid the maintainers in their diagnostic work. The results of this thesis will serve as a baseline for further research and will be presented to the program management office for combat systems (PM-CS) for further consideration and development.
US Army RDECOM-TACOM author (civilian).

APA, Harvard, Vancouver, ISO, and other styles

28

Bowen, Brennan P. "Manufacturing system maintenance development." Master's thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-01262010-020257/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

De, Supinski Bronis R. "Logical time coherence maintenance." Full text, Acrobat Reader required, 1998. http://viva.lib.virginia.edu/etd/theses/supinski98.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Semones, Gary I. "Maintenance mishap investigation course." CSUSB ScholarWorks, 1986. https://scholarworks.lib.csusb.edu/etd-project/418.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Lindholm, M. (Mira). "Regenerative maintenance in buildings." Bachelor's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201910243012.

Full text

Abstract:

Abstract. University Properties of Finland is involved in European Cost Restore project, where the main point is to survey strong and regenerative sustainable development’s challenges in built environment. Starting point of the project is view, where the built environment is not sustainable just being “less bad”, for example more energy efficient, than before. Instead built environment must be in the future “better” and it must aim at strengthened and regenerative sustainability. The aim of the work is to do comprehensive literary survey of evolution in real estate service and maintenance of the properties. The whole is approached first as a level of whole surrounding natural system, second as a level of location of property and third as a level of the property. First this work concentrate surrounding natural system, second regenerative building and last regenerative maintenance. The focus before anything is at campus areas, commercial and office premises, but the views might be applicable more widely.Regeneratiivinen kiinteistöjen ylläpito. Tiivistelmä. SuomenYliopistokiinteistöt Oy on mukana eurooppalaisessa COST RESTORE -verkostohankkeessa, jossa kartoitetaan vahvan ja uudistavan kestävän kehityksen haasteita rakennetussa ympäristössä. Keskeisenä lähtökohtana on näkemys, että rakennettu ympäristö ei ole kestävä olemalla "vähemmän huono" eli esimerkiksi vähemmän energiatehokkaampi kuin aiemmin. Sen sijaan rakennetun ympäristön on oltava tulevaisuudessa "enemmän hyvä" ja sen on pyrittävä sekä vahvistamaan että uudistavaan kestävyyteen. Tämän työn päätavoitteena on tehdä kattava kirjallisuuskatsaus kestävän kehityksen evoluutiosta kiinteistöpalveluissa ja kiinteistön ylläpidossa. Kokonaisuutta lähestytään kaupunkiympäristön kontekstissa, kiinteistön sijainnin tasolla ja kiinteistön tasolla. Ensiksi työssä keskitytään ympäröivään luontosysteemiin, toiseksi regeneratiiviseen rakennukseen ja kolmanneksi regeneratiiviseen ylläpitoon. Työssä keskitytään toimi- ja liiketiloihin sekä kampusalueisiin, mutta työssä esiteltävät keinot ovat sovellettavissa mahdollisesti laajemminkin.

APA, Harvard, Vancouver, ISO, and other styles

32

Pierotti, Mark J. "Aircraft Maintenance Engineering : developing Aircraft Maintenance Programme using Reliability Centred Maintenance/MSG3 analysis and taking into consideration ETOPs and low utilisation." Thesis, City University London, 2005. http://openaccess.city.ac.uk/8461/.

Full text

Abstract:

The thesis is entitled "Aircraft Maintenance Engineering: Developing an Aircraft Maintenance Programme using Reliability Centred Maintenance/ MSG3 Analysis Taking into Consideration ETOPS and Low Utilisation", It brings together and explains an area that the author feels is not well documented or published today in the world of aviation maintenance management, yet it is fundamental on the continued airworthiness of an aircraft, it can be considered as the building block for maintaining the inherent reliability and airworthiness of the design. It is the author's experience that too many times operators have attempted to carry out the function of maintenance engineering with out full understanding of the reasons and implication of their actions, thus ending up with an ineffective and non applicable collection of maintenance activities that can only add to the expense of the technical operation and even at times contribute to the possibility of occurrences. The thesis also goes on to develop new decision tree diagrams based upon Reliability Centred Maintenance (RCM) / Maintenance Steering Group 3 (MSG3) analysis for the use in developing the Maintenance and Reliability Programme and incorporating new aspects of aircraft operation.

APA, Harvard, Vancouver, ISO, and other styles

33

Lo, Cheuk-shing. "Maintenance planning for heritage buildings developing a maintenance planning model for Hong Kong /." Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B31476910.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Rastegari, Ali. "Strategic Maintenance Development focusing on use of Condition Based Maintenance in Manufacturing Industry." Licentiate thesis, Mälardalens högskola, Innovation och produktrealisering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-28486.

Full text

Abstract:

The growth of global competition caused remarkable changes in the way manufacturing companies operate. These changes have affected maintenance and made its role even more crucial in business success. In order to stay competitive, manufacturing companies need to continuously increase the effectiveness and efficiency of their production processes. Further, by introducing lean manufacturing the concern about equipment availability is increased and so, the demand for effective maintenance. Despite the increasing demand on reliable production equipment, few manufacturing companies work with strategic maintenance development. Moreover, conventional maintenance strategies such as corrective maintenance are not sufficient today to fulfill the industrial needs on maximum reduction of failures and degradations of manufacturing systems. The concept of maintenance has evolved over the last few decades from a corrective attitude (maintenance intervention after a failure), to a predictive attitude (maintenance intervention fixed to prevent the fault). Strategies and concepts such as Condition Based Maintenance (CBM) have thus evolved to support this ideal situation. CBM is a set of maintenance actions based on real-time or near real-time assessment of equipment condition, which is obtained from embedded sensors and/or external tests and measurements taken by portable equipment and/or subjective condition monitoring. CBM is becoming recognized as the most efficient strategy for carrying out maintenance in a wide variety of industries. However, the practical implementation of advanced maintenance technologies, such as CBM, in manufacturing industry is more scarce. Therefore, the objective with this research is to study on how to implement and develop an effective and efficient CBM strategy in manufacturing industry. This thesis will start with an analysis of the overall maintenance management to illustrate how to formulate a maintenance strategy, following with the focus on CBM; cost effectiveness of implementing CBM; an introductory review of applied CBM practices and CBM implementation process, all in manufacturing industry. The data was collected through case studies mainly at one major manufacturing site. The main part of the data was collected during a pilot project to implement CBM. As the result, a formulated maintenance strategy has been developed and presented. Factors to evaluate CBM cost effectiveness have been assessed. These factors indicate the benefits of CBM mostly in reducing probability of having maximal damage in production equipment and reducing production losses particularly in high production volumes. Further, a process of CBM implementation has been presented. Some of the main elements in the process are selection of the components to be monitored, techniques and technologies as well as installation of the technologies and finally how to analyze the results from the condition monitoring.

APA, Harvard, Vancouver, ISO, and other styles

35

Thiruvengadam, Arunprakash. "A practical method for assessing maintenance factors using a value stream maintenance map." Thesis, Wichita State University, 2009. http://hdl.handle.net/10057/2499.

Full text

Abstract:

In today's highly competitive business environment every company is heading to increase its overall production and profit by decreasing its consumed manufacturing cost. Reduction in manufacturing cost can be effectively achieved by means of reducing the non-value added costs and activities involved in the production process. Breakdown maintenance effectiveness plays a vital role in machines availability for production. Assessing breakdown maintenance activities helps an organization to organize and effectively streamline the maintenance actions carried out in order to reduce the consumption of input resources. In this research work, a method is proposed for assessing the breakdown maintenance factors using a value stream maintenance map (VSMM) enabling the assessment of measurable maintenance factors. To attain the proposed method, initially, various breakdown maintenance factors are identified and grouped. Then a breakdown maintenance performance measures hierarchy and a framework are developed in this thesis. Next a method which incorporates the calculation of key breakdown maintenance metrics and a VSMM along with the key breakdown maintenance metrics and their respective trends is detailed. Finally the proposed method is implemented in a hypothetical and three industrial case studies. This helps to record and assess the breakdown maintenance effectiveness of a production line and thus leading to continuous improvement opportunities. vi
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Industrial and Manufacturing Engineering

APA, Harvard, Vancouver, ISO, and other styles

36

Dietrich, Stephanie [Verfasser], and Waltraud [Akademischer Betreuer] Kahle. "Cost optimal maintenance in systems with imperfect maintenance / Stephanie Dietrich ; Betreuer: Waltraud Kahle." Magdeburg : Universitätsbibliothek, 2016. http://d-nb.info/1118572165/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Lo, Cheuk-shing, and 盧焯成. "Maintenance planning for heritage buildings: developing a maintenance planning model for Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31476910.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Iyer, Prasad. "The Effect of Maintenance Policy on System Maintenance and System Life-Cycle Cost." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31815.

Full text

Abstract:

This research presents a framework system dynamics (simulation) model that evaluates the effect of maintenance policies on system performance and life-cycle cost. The model highlights factors such as learning, aging and the technological upgrades that occur during the life-cycle of a system. The metrics used to measure the effectiveness of maintenance policies are the system life-cycle cost and cumulative breakdowns. In this research, a varying maintenance policy has been modeled using system dynamics methodology to determine the future performance of the system that is dependent upon its past performance when breakdowns occur randomly. The main objective of this modeling approach is to balance the cost of preventive maintenance actions with the opportunity losses due to system breakdowns. The approach used in this research primarily involves forecasting future breakdowns using an average of accumulated opportunity losses. This research effort was mainly aimed at developing a (framework) model to determine effective maintenance policy for a system and evaluating the effect on the life-cycle cost for various scenarios. This model could further form the basis of a decision support system for maintenance modeling.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

39

Bergkvist, Erik, and Tommy Sabbagh. "Smart Future Solutions for Maintenance of Aircraft : Enhancing Aircraft Maintenance at Saab AB." Thesis, Linköpings universitet, Industriell Produktion, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176561.

Full text

Abstract:

This master thesis has the purpose to analyse and identify smart efficient future solutions within the Maintenance, Repair and Overhaul (MRO) process for aircraft. The efficiency solutions, in form of new technologies and tools, should present a foundation that MRO suppliers can continue to develop to enhance and streamline their maintenance processes. The project was performed as a case study at the aerospace and defense company Saab AB in Linköping, where the company's MRO process was investigated. Through identifying possibilities and alternative technologies available today and in the near future, one continues to have a competitive and future-proof position in the market. Through an own constructed course of action influenced from established methods, the thesis' purpose and aim was attained. The method was based on authentic approaches for case studies but also inspired by the so-called "Requirement Engineering". The combination of the methods resulted in a precise focus on the relevant subjects, together with a clear structure of the requirements on the technologies to reach a successful implementation. Through a detailed data collection comprised of study visits, interviews, literature studies, market analyses, and document reviews, multiple relevant technologies and requirement-lists for utilization were identified. To concretize the use and potential improvements with the technologies, the project had the objective to develop a demonstrator with one of the technologies presented. The demonstrator should focus on minimizing the use of paper, which is a common problem among many market actors today. The most promising technology was considered to be a tablet application with an accommodated application. The selection of the tablet solution was based on the motivation that it is a well-established technology and a favorable first step from paperwork. To conclude this master thesis, a tablet application was developed in Novacura Flow Studio, where the majority of the identified requirements were fulfilled. Beyond the demonstrator, an introduction and analysis of technologies, such as AR-glasses, voice guidance, additive manufacturing, and a digital twin, was presented.

APA, Harvard, Vancouver, ISO, and other styles

40

Azevedo, Celso. "Et maintenant, la maintenance les potentialités d'une fonction essentielle pour les réseaux d'autobus urbains." Paris 12, 1991. http://www.theses.fr/1991PA120011.

Full text

Abstract:

Dans le section des transports collectifs urbains (TCU) et principalement dans les réseaux d'autobus, la gestion de la maintenance se heurte à un paradoxe : elle concerne peu les entreprises et pourtant, celles-ci ne peuvent pas éviter d'investir pour améliorer cette fonction. Face à cette réalité, notre travail s'inscrit dans le mouvement de recherche d'une productivité dans les TCU. Notre problématique concerne alors des questions portant d'une part sur la place accordée à la maintenance au sein des réseaux d'autobus et d'autre part, sur la nature des gains de productivité possibles dans les activités des ateliers. La première partie du travail est une étude approfondie sur les spécificites du produit de la maintenance. Dans la deuxième partie de notre travail, nous proposons une méthode appropriée à une évaluation technico-économique des résultats de maintenance destinée à mettre en évidence les gains de productivité réalisables dans cette fonction. En testant cette méthode dans le réeau d'Orleans, nous avons pu confirmer sa validité en tant qu'outil de prévisions, en ce qui concerne aussi bien la charge de travail que l'impact économique de la maintenance
In the urban transportation (UT. ) industry and mainly in the bus systems, the maintenance management faces a paradox: companies are not aware enough of its importance, even though they cannot avoid to invest to improve that function. Taking this into account, our work intends to help in the search for an improved productivity in the UT we had here two main concerns: one hand, we tried to answer the questions concerning the place granted to bus maintenance inside the bus system; on the other hand we intended to answer the questions about the nature of potential productivity increase in the workshop activities. The first part of this work is devoted to a deep study about the characteristics of maintenance product. In the second part we propose an appropriate method to make a bout technical and economical evaluation of the maintenance results, in order to outline possible productivi8ty increase that is to obtain in this function. While testing this method in Orleans’ bus system, we could validate its ability to be an efficient prevision tool to evaluate both the workload and the economical repercussions of maintenance

APA, Harvard, Vancouver, ISO, and other styles

41

Coetzee, Jasper Lodewikus. "An Optimised instrument for designing a maintenance plan - A sequel to reliability centred maintenance." Thesis, University of Pretoria, 2002. http://hdl.handle.net/2263/30007.

Full text

Abstract:

Reliability Centred Maintenance (RCM) started a new chapter in the history of preventive maintenance strategy setting. It was now possible to develop a scientifically based, highly successful maintenance program for complex systems. It developed as a result of the reliability problems and cost of maintenance of aircraft during the late 50’s and early 60’s. The result was a methodology called MSG-1, followed by the improved MSG-2. When MSG-2 was used contractually for the United States Department of Defence, it led to the present definition of RCM. In academic circles there developed a growing dissatisfaction with the technique [Pintelon et al (1999], of which part stems from watering down its scientific basis to make RCM more marketable [Moubray (2000)], while at least part is based on perceived inherent scientific weaknesses in the methodology itself. This thesis, in setting out to solve these limitations, makes several important contributions to the RCM methodology. The first of these is a method of concentrating the RCM analysis effort on the most important failure modes encountered by the organisation. Secondly, it introduces a Quality Improvement task in the RCM task selection tree, based on a limitation identified by Harris (1985). The third contribution is the addition of a formal task packaging methodology, following Gits (1984). The thesisalso combines the use of RCM for the most important failure modes with conventional maintenance tasks for the remaining failure modes, to form a total methodology for the typical industrial concern. It furthermore introduces the application of sound management principles in the implementation of RCM and lastly, blends concepts from different RCM authors, together with the innovations listed above, into one logical whole. In summary, the proposed revised methodology can play a very important part to achieve the goal of World Class manufacturing standards, including ensuring that the organisation’s maintenance effort is as proactive as possible. D13/4/90
Thesis (PhD (Industrial Engineering))--University of Pretoria, 2002.
Industrial and Systems Engineering
unrestricted

APA, Harvard, Vancouver, ISO, and other styles

42

Hartmann, Jens. "Analysis of maintenance records to support prediction of maintenance requirements in the German Army." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA392054.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Donaldson, Isaac J. "Visualization of big data through ship maintenance metrics analysis for fleet maintenance and revitalization." Thesis, Monterey, California: Naval Postgraduate School, 2014. http://hdl.handle.net/10945/41370.

Full text

Abstract:

Approved for public release; distribution is unlimited.
There are between 150 and 200 parameters for measuring the performance of ship maintenance processes in the U.S. Navy. Despite this level of detail, budgets and timelines for performing maintenance on the Navy's fleet appear to be problematic. Making sense of what these parameters mean in terms of the overall performance of ship maintenance processes is clearly a big data problem. The current process for presenting data on the more than 150 parameters measuring ship maintenance performance costs and processes, containing billions of data points, is still done by static, cumbersome spreadsheets. The central goal of this thesis is to provide a means to aggregate voluminous maintenance data in such a way that the causal factors contributing to cost and schedule overruns can be better understood by ship maintenance leadership. Big data visualization software was examined to determine if visualization tools could improve the understanding of U.S. Navy ship maintenance by its leaders. This thesis concludes that the visualization of big data supports decision making by enabling leaders to quickly identify trends, develop a better understanding of the problem space, establish defensible baselines for monitoring activities, perform forecasting, and evaluate metrics for use.

APA, Harvard, Vancouver, ISO, and other styles

44

Toves, Peter Rocky. "Evaluating Success Factors in Implementing E-Maintenance in Maintenance, Repair, and Overhaul (MRO) Organizations." ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/767.

Full text

Abstract:

Despite more than a decade-long process to transition aircraft maintenance practices from paper-to electronic-based systems, some organizations remain unable to complete this transition. Researchers have indicated that while organizations have invested resources in technology improvements, there remains a limited understanding of the factors that contribute to effectively managing technology-enabled change. The purpose of this case study was to identify and explore socio-technical (ST) factors that inhibit an effective transition from a paper-based system to an electronic-based system for aircraft maintenance. A conceptual model applying theories of change management, technology acceptance, systems thinking, and ST theory informed the research. Thirteen participants provided data via semistructured interviews, field observations, follow-up interviews, other documentation, and a questionnaire. Data were analyzed with open and axial coding techniques to identify themes, which were then crosschecked and triangulated with observation and follow-up interview data. Findings revealed communication issues, a fundamental misconception in training, and a false assumption that all personnel easily acquire computer literacy. Benefits gained from this study should assist maintenance, repair, and overall (MRO) organizations within the Department of Defense to improve current and future technology implementation as the research underscores real-life issues from a comparable organization. The implications for positive social change provide a greater understanding of technology-enabled change and contribute to the development of best practices for technology initiatives that address common ST issues in the MRO workplace.

APA, Harvard, Vancouver, ISO, and other styles

45

Cancian, Glen Andrew. "Heuristic Based Optimisation of Pavement Management Scheduling." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/366768.

Full text

Abstract:

The issue of effectively scheduling pavement maintenance and rehabilitation treatments over a multi-year planning horizon plagues road authorities around the world with the significance of this issue being amplified by both an ageing pavement network and the trend towards insufficient fund allocation. The scope of the problem can be quantified as follows: if only a single treatment is able to be applied to each individual road segment in a single year, then the total number of possible programmed maintenance and rehabilitation schedule alternatives for a moderate-sized network of 1,000 road segments, with eight different treatments possible, over a twenty year anaysis period is ((1.0 × 103)8)20 = 1.0 × 10480. Assuming that a computer can build and evaluate 100 complete maintenance and rehabilitation schedules a second, to identify the optimal schedule for this 1,000 segment road network would take 3.17 × 10471 years. The overall goal of this study is to investigate the benefits of applying modern heuristic optimisation techniques to the problem of pavement main- tenance and rehabilitation scheduling over a multi-year planning horizon. To address this goal, a four stage approach was utilised using a real road network with real pavement condition data as the test benchmark.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Engineering
Science, Environment, Engineering and Technology
Full Text

APA, Harvard, Vancouver, ISO, and other styles

46

Muyingo, Henry. "Property maintenance concepts and determinants /." Licentiate thesis, Stockholm : Skolan för arkitektur och samhällsbyggnad, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11356.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Nannetti, Federica. "Expert Systems in Maintenance Diagnostic." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

Find full text

Abstract:

Lo scopo di questo lavoro è introdurre il lettore all’utilizzo dei sistemi esperti nell’ambito manutentivo, specialmente riguardo alla diagnostica. La struttura della dissertazione è articolata in tre parti principali. La prima consiste in una panoramica sulla manutenzione e sui metodi più comuni che ne fanno parte, focalizzandosi specialmente su quelli che sono più attinenti ai sistemi esperti. Nella seconda parte il lettore può trovare le tipologie, le caratteristiche rilevanti e la storia dei sistemi esperti. L’ultima parte della tesi è dedicata allo sviluppo del caso di studio, introdotto da una descrizione del software utilizzato per la sua progettazione (VisiRule). A conclusione del lavoro sono presentate delle considerazioni sugli aspetti positivi dell’utilizzo di sistemi esperti nell’ambito della diagnostica manutentiva.

APA, Harvard, Vancouver, ISO, and other styles

48

Bargeron, Jay M. "Optimal depot level maintenance planning." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA303505.

Full text

Abstract:

Thesis (M.S. in Operations Research) Naval Postgraduate School, September 1995.
"September 1995." Thesis advisor(s): Siriphong Lawphongpanich. Includes bibliographical references. Also available online.

APA, Harvard, Vancouver, ISO, and other styles

49

Para, Alessia. "Meristem Maintenance in Arabidopsis thaliana." Doctoral thesis, Uppsala universitet, Fysiologisk botanik, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4310.

Full text

Abstract:

The shoot apical meristem (SAM) is the structure that shapes the aerial architecture of the plant, by producing lateral organs throughout development. In the model plant Arabidopsis thaliana, the SAM is always identifiable as a characteristic dome, whether it is found in the centre of a rosette of leaves or at the tip of an inflorescence. When senescence occurs and organogenesis ceases, the now inactive SAM still retains its characteristic appearance and it is never consumed into a terminal structure, such as a flower. Mutant plants that undergo termination represent a valuable tool to understand how the SAM structure and function are maintained during plant life. The aim of this work was to investigate the dynamics of meristem development through morphological and genetic studies of three Arabidopsis mutants that exhibit distinct modes of SAM termination: distorted architecture 1 (dar1), adenosine kinase 1 (adk1) and terminal flower 2 (tfl2). The dar1 mutation is characterised by a severely distorted cellular architecture within the SAM. We propose that dar1 affects the pattern of cell differentiation and/or cell proliferation within the SAM apical dome, resulting in termination by meristem consumption. Instead, the adk1 mutation affects the organogenic potential of the SAM, without altering its structure. The adk1 mutant has increased levels of cytokinins and, as a consequence of this, cell division is enhanced and cell differentiation is prevented in the apex, causing termination by meristem arrest. Finally, tfl2 is mutated in the conserved chromatin remodelling factor HP1, a transcriptional repressor with multiple roles during plant development. The tfl2 SAM terminates by conversion into a floral structure, due to de-repression of floral identity genes. Interestingly, tfl2 mutants also show an altered response to light, an indication that TFL2 might act as a repressor also in the context of light signalling.

APA, Harvard, Vancouver, ISO, and other styles

50

Mullen, Nadia, and n/a. "Maintenance of interventions in organisations." University of Otago. Department of Psychology, 2007. http://adt.otago.ac.nz./public/adt-NZDU20071015.160435.

Full text

Abstract:

Many successful interventions are not maintained after researchers leave an organisation at the conclusion of a study. This research was conducted to assess the magnitude of this problem and determine which variables affect intervention maintenance. Maintenance was examined in a review and analysis of 125 applicable studies published in the Journal of Organizational Behavior Management from 1977 - 1999. Where necessary, authors of studies were contacted to determine the maintenance status of their intervention. The analysis found the extent of this problem in published studies is substantial. Intervention maintenance was necessary to maintain the intervention�s effects in two thirds of studies with successful interventions. Of all studies where maintenance was necessary, approximately 40% failed to maintain the intervention. The maintenance procedures derived from the literature, researchers in the field, and journal analysis included planning for a wide range of positive outcomes, designing the intervention to be long-term, and communicating the benefits of the intervention to the organisation. For this thesis, three studies were conducted to examine the effectiveness of these maintenance procedures. The first two studies partially replicated studies where the interventions had been successful but not maintained, with the inclusion of maintenance procedures. Intervention maintenance occurred in a university cafeteria in Study 1, and in one of three supermarkets in Study 2. Study 3 improved on the design and procedure of Study 2, including a manipulation of the maintenance procedures. During intervention in the control supermarket, signs designed to increase customer donations to the supermarket foodbank bin were placed on shelves near discounted items. In the experimental supermarket, both maintenance procedures and signs were used. During 6 weeks of follow-up, the signs were maintained in both supermarkets. The researcher then ceased regular observations, returning only for 1 month, 2 month, and 1 year follow-ups. After researcher presence was withdrawn, maintenance of the signs continued only in the experimental supermarket. This study demonstrates that the maintenance procedures were effective, and necessary, for long-term maintenance to occur after the researcher left the organisation. It was concluded that the maintenance procedures were effective for encouraging intervention maintenance, and recommended that researchers incorporate the procedures into their studies when maintenance is desirable.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Maintenance'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles