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Letteratura scientifica selezionata sul tema "Service life (Engineering)"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 agosto 2024

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Articoli di riviste sul tema "Service life (Engineering)"

DODERO, JUAN MANUEL, ERNIE GHIGLIONE e JORGE TORRES. "ENGINEERING THE LIFE-CYCLE OF SEMANTIC SERVICES-ENHANCED LEARNING SYSTEMS". International Journal of Software Engineering and Knowledge Engineering 20, n. 04 (giugno 2010): 499–519. http://dx.doi.org/10.1142/s0218194010004852.

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Service-oriented learning environments are the new paradigm for interoperability of learning management systems. They support a wider range of needs by integrating existing and emergent services, leading to an entirely new architectural design for such systems. The engineering life-cycle of resources and services can be enhanced and integrated in current and future virtual learning environments. This work defines a services-enhanced learning architecture and describes two levels of integration carried out to author, deploy and enact learning services from open web-based interaction protocols and semantic web service descriptions.

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Camera, Fernanda, John Ahmet Erkoyuncu e Steve Wilding. "Service Data Quality Management Framework to Enable Through-life Engineering Services". Procedia Manufacturing 49 (2020): 206–10. http://dx.doi.org/10.1016/j.promfg.2020.07.020.

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(Gray)Byrd, L. G. "Service Life and Life of Service: The Maintenance Commitments". Transportation Research Record: Journal of the Transportation Research Board 1650, n. 1 (gennaio 1998): 5–9. http://dx.doi.org/10.3141/1650-01.

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The magnitude of today’s highway maintenance challenge, the impact of research on maintenance, basic objectives that should drive a maintenance program, and the progress made in meeting them over the last 4 decades are discussed. Highway maintenance should include the objectives of providing a consistently safe, comfortable, and efficient travel way for highway users and a safe environment for maintenance crews; providing optimum service life; maintaining as-built capacity and reliability; inviting, supporting, and using research and innovation; and performing with professionalism, competence, and diligence. Some of the challenges in meeting these objectives today are accelerating rates of deterioration, limited time available to work, complex interchanges and crowded rights-of-way, environmental restrictions, a litigious society, and public skepticism about all government functions. Three categories of responses are technologies, policies, and professionalism. A significant array of new, innovative tools and other products of research are making maintenance technology more effective. Maintenance managers need to be activists in promoting progressive policies in providing as-built capacity while performing maintenance and repair work and in procuring products and services. Maintenance policies should include recognition of user costs, use of performance specifications, fabrication of off-site repair components, design of repairable highway systems, use of corrosion-resistant materials, privatization of segments of the maintenance program, and establishment of an international maintenance technology reference program. Individual professionals must embrace continuing education, environmental sensitivity, community service, research and development, innovative management, and societal and political responsibilities.

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Harrison, H. W. "Estimating Service Life". Batiment International, Building Research and Practice 13, n. 1 (gennaio 1985): 37–41. http://dx.doi.org/10.1080/09613218508551240.

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Masters, Larry W. "Service life prediction". Batiment International, Building Research and Practice 15, n. 1-6 (gennaio 1987): 292–96. http://dx.doi.org/10.1080/09613218708726837.

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Linins, Oskars, Ernests Jansons, Armands Leitans, Irina Boiko e Janis Lungevics. "Estimation of Service Life of Mechanical Engineering Components". Key Engineering Materials 799 (aprile 2019): 71–76. http://dx.doi.org/10.4028/www.scientific.net/kem.799.71.

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The paper is aimed to the methodology for estimation of service life of mechanical engineering components in the case of elastic-plastic contact of surfaces. Well-known calculation methods depending on physics, theory of probability, the analysis of friction pair’ shape and fit include a number of parameters that are difficult or even impossible to be technologically controlled in the manufacturing of mechanical engineering components. The new approach for wear rate estimation using surface texture parameters as well as physical-mechanical properties and geometric parameters of components is proposed. The theoretical part of the calculations is based on the 3D surface texture principles, the basics of material fatigue theory, the theory of elasticity and the contact mechanics of surfaces. It is possible to calculate the service time of the machine, but the process of running-in of the components is relatively short (less than 5%), therefore, the service time is mainly determined by a normal operating period, which also was used to evaluate this period. The calculated input parameters are technologically and metrologically available and new method for calculating the service time can be used in the design process of the equipment. The results of approbation of the method for estimation service time of mechanical engineering, which prove the applicability of mentioned method, are offered as well.

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Masood, Tariq, Johannes Egger e Maximilian Kern. "Future-proofing the Through-life Engineering Service Systems". Procedia Manufacturing 16 (2018): 179–86. http://dx.doi.org/10.1016/j.promfg.2018.10.162.

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He, Y., C. Li, T. Zhang, J. Liu, C. Gao, B. Hou e L. Wu. "Service fatigue life and service calendar life limits of aircraft structure: aircraft structural life envelope". Aeronautical Journal 120, n. 1233 (19 settembre 2016): 1746–62. http://dx.doi.org/10.1017/aer.2016.93.

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ABSTRACTThe service life of aircraft structure includes the fatigue life and calendar life. The Aircraft Structural Life Envelop (ASLE) is a safe and reliable life scope of aircraft structures in service. The specific steps to establish the ASLE are developed, and a residual life prediction method for aircraft structure under service environments is established by combining the ASLE with the Miner theory. Furthermore, a service life extension method of aircraft structure is proposed based on a scope extension of the ASLE, including methods based on reliability analysis and structural repair. Finally, an application example of the ASLE is presented.

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Zhang, Yufeng, e Lihong Zhang. "Organizing complex engineering operations throughout the lifecycle". Journal of Service Management 25, n. 5 (14 ottobre 2014): 580–602. http://dx.doi.org/10.1108/josm-07-2013-0182.

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Purpose – Strategic trends towards service operations have been widely reported in the recent literature, but organisational capabilities to support such service-centred strategies are less well understood. The purpose of this paper is to identify key organisational issues in managing complex engineering service operations throughout the lifecycle. Design/methodology/approach – Using instruments developed from the product lifecycle management technologies and the network configuration concept, key organisational issues for engineering service operations were identified through case studies focusing on complex engineering products and services systems across a variety of industrial sectors. Findings – The case studies demonstrated different organisational features and strategic priorities of engineering service operations along the whole lifecycle. A generic trend has been observed for engineering systems to move from being design, development and manufacturing focused to embracing support and end-of-life recycling matters. Originality/value – This paper provides an overall framework for integrating key organisational issues in engineering service operations. It contributes to the service literature by highlighting the need of developing appropriate organisational capabilities to support service-centred strategies with engineering cases. It also provides guidance for companies to manage their engineering network operations throughout the whole lifecycle of complex products and services systems.

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Aljawarneh, Shadi. "Cloud Security Engineering". International Journal of Cloud Applications and Computing 1, n. 2 (aprile 2011): 64–70. http://dx.doi.org/10.4018/ijcac.2011040105.

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Information security is a key challenge in the Cloud because the data will be virtualized across different host machines, hosted on the Web. Cloud provides a channel to the service or platform in which it operates. However, the owners of data will be worried because their data and software are not under their control. In addition, the data owner may not recognize where data is geographically located at any particular time. So there is still a question mark over how data will be more secure if the owner does not control its data and software. Indeed, due to shortage of control over the Cloud infrastructure, use of ad-hoc security tools is not sufficient to protect the data in the Cloud; this paper discusses this security. Furthermore, a vision and strategy is proposed to mitigate or avoid the security threats in the Cloud. This broad vision is based on software engineering principles to secure the Cloud applications and services. In this vision, security is built into all phases of Service Development Life Cycle (SDLC), Platform Development Life Cycle (PDLC) or Infrastructure Development Life Cycle (IDLC).

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Tesi sul tema "Service life (Engineering)"

Balla, Chaitanya Kumar. "Prediction of Remaining Service Life of Pavements". University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1279316853.

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Garcia-Ruiz, Johnnatan A. "Service Life Assessment of Culverts in Ohio". Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1470833987.

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Mahmoodian, Mojtaba. "Reliability analysis and service life prediction of pipelines". Thesis, University of Greenwich, 2013. http://gala.gre.ac.uk/11374/.

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Pipelines are extensively used engineering structures for conveying of fluid from one place to another. Most of the time, pipelines are placed underground, surcharged by soil weight and traffic loads. Corrosion of pipe material is the most common form of pipeline deterioration and should be considered in both the strength and serviceability analysis of pipes. The study in this research focuses on two different types of buried pipes including concrete pipes in sewage systems (concrete sewers) and cast iron water pipes used in water distribution systems. This research firstly investigates how to involve the effect of corrosion as a time dependent process of deterioration in the structural and failure analysis of these two types of pipes. Then two probabilistic time dependent reliability analysis methods including first passage probability theory and the gamma distributed degradation model are developed and applied for service life prediction of the pipes. The obtained results are verified by using Monte Carlo simulation technique. Sensitivity analysis is also performed to identify the most important parameters that affect pipe failure. For each type of the pipelines both individual failure mode and multi failure mode assessment are considered. The factors that affect and control the process of deterioration and their effects on the remaining service life are studied in a quantitative manner. The reliability analysis methods which have been developed in this research, contribute as rational tools for decision makers with regard to strengthening and rehabilitation of existing pipelines. The results can be used to obtain a cost-effective strategy for the management of the pipeline system. The output of this research is a methodology that will help infrastructure managers and design professionals to predict service life of pipeline systems and to optimize materials selection and design parameters for designing pipelines with longer service life.

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Custer, Nicholas C. "Ash impacts on gasoline particulate filter performance and service life". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100142.

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Thesis: S.M. in Mechanical Engineering, and S.M in Naval Architecture and Marine Engineering, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 71-74).
New regulations in the United States and Europe, designed to address climate change concerns by reducing greenhouse gas emissions, are causing increased use of gasoline direct-injection (GDI) engines in light-duty vehicles (LDV). Separate new regulations that aim to reduce particulate emissions to address air pollution concerns are taking effect concurrent with greenhouse gas limitations in both jurisdictions. GDI engines are proven to create more particulate emissions than previously utilized port-injection technology. Increasing particulate emissions rates combined with falling regulatory particulate emissions limits requires new strategies to reduce these emissions from gasoline powered LDVs. Particulate filters have been successfully implemented to reduce particulate emissions from diesel engine exhaust for over a decade. Diesel particulate filters have a demonstrated filtration efficiency of 95% or greater and have reduced diesel particulate mass (PM) emissions by one to two orders of magnitude. GDI engines require no more than one order of magnitude reduction in particulate emissions to meet new regulations. Existing particulate filter technology in use in diesel vehicles is capable of reducing GDI engine emissions to new regulatory levels; however, it is proposed that these reduction may be achievable through means other than gasoline particulate filters (GPF). A GPF will create an additional back-pressure in the engine exhaust system that will reduce engine power and efficiency. This backpressure will increase as PM is trapped in the filter and decrease as combustible PM removed. A buildup of incombustible ash present in engine-out PM will increase the baseline backpressure of the filter during the course of its service life. It is important to understand the impact of ash on the filter pressure drop performance before implementing GPF to meet new emissions regulations. This study builds on existing diesel particulate filter technology and demonstrates through experimental results the mechanisms by which ash increases GPF pressure drop. Ash deposits are also shown to increase the light-off temperature of three-way catalyst coatings in GPF.
by Nicholas C. Custer.
S.M. in Mechanical Engineering, and S.M in Naval Architecture and Marine Engineering

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Sohawon, Haris. "Service life extension of reinforced concrete structures using hydrophobic impregnation". Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29806.

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Over the last few decades, the increasing premature deterioration of reinforced concrete structures, mainly due to rebar corrosion, has become a worldwide concern. This has been attributed to insufficient quality and quantity of cover concrete resulting from inadequate mix design and poor onsite workmanship respectively. Engineers also often lack understanding of concrete durability and prescribe insufficient cover depths relative to the exposure conditions. Concrete degradation has many financial and social implications on a larger scale. Direct costs relate to the repair and rehabilitation of existing structures to maintain serviceability while indirect costs include loss in productivity and reduced economic growth. With increasing demand for infrastructure and subsequent expansion of the built environment, there is greater need for concrete to withstand and perform in corrosive environments. Hence, designing for durability has gained significant importance amongst engineers and other stakeholders in the construction industry. Furthermore, the appearance of cracks can be considered as an inevitable phenomenon in the design life of reinforced concrete structures, due to concrete being an inherently cracked material. The presence of cracks within the cover zone changes the dynamics of transport mechanisms and corrosion development. Cracks provide preferential ingress paths for deleterious species such as chlorides and this leads to a reduction in the time taken for reinforcement corrosion initiation and thus reduces the service life of the structure. Most service life models also consider concrete only in the uncracked state, leading to an overestimation of the actual performance and design life of reinforced concrete infrastructure. Extensive research has been carried out to find means to promote the service life of reinforced concrete structures in aggressive environments. Hydrophobic (silane) impregnation represents a cost-effective way to increase the durability of concrete structures in cases where insufficient cover quality and depth have been achieved. The hydrophobic impregnation agent lines the internal capillary pore structure and provides a water-repellent surface without affecting the external appearance of the concrete. Thus, the risk of reinforcement corrosion and subsequent deterioration can be reduced as the ingress of water-dissolved aggressive species is minimised or prevented. The influence of silane impregnation on chloride ingress is well documented in literature and several experiments have been carried out over the last decades. However, there is limited work on the service life modelling of silane treated concrete. Hence, the purpose of this study was to investigate and quantify the influence of silane impregnation as a remedial measure for poor quality cover or insufficient cover depth in newly constructed structures and ultimately predict the time to corrosion initiation for specific cover depths and concrete types. The effectiveness of silane impregnation in cracked concrete was also studied. Two w/b ratios (w/b = 0.45 and w/b = 0.60) and four binder types (CEM I 52.5N, Fly-ash (FA), Ground granulated Corex slag (GGCS) and CEM III/B 42.5N) were selected. Hence, a total of 8 main (normal) concrete mixes and 4 poor quality mixes were used. Poor quality concrete was produced by exposing the concrete specimens to relatively high temperature at early age. Cracked concrete was obtained by loading notched reinforced beams until the formation of cracks. Steel spacers were then placed in the notch and the beams were unloaded to create crack widths of 0.2 mm and 0.6 mm (below and above the commonly assumed crack width threshold of 0.4 mm). Silane treatment was performed at a specimen age of 28 days by applying Sikagard®-706 Thixo at a consumption rate of 400 g/m2 . Several experimental tests were performed on untreated and silane treated concrete. Compressive strength and Durability Index (DI) tests were carried out to characterise the concrete mixes. Accelerated carbonation and moisture profiling tests were undertaken to assess the influence of silane impregnation on concrete carbonation and relative humidity. Finally, uncracked and cracked (untreated and treated) concrete mixes were ponded in sodium chloride (NaCl) solution for 80 days, followed by chloride profiling. The data for the uncracked concrete was curve fitted using a solution to Fick’s second law of diffusion. The regression parameters obtained (surface chloride concentration (Cs) and apparent chloride diffusion coefficient (Da)) were then incorporated in a mathematical solution to Fick’s second law to obtain suitable expressions that describe the penetration of chlorides with time for silane treated and untreated concrete mixes. Hence by determining the time taken for chloride concentration at the rebar level to reach the critical threshold (assumed to be 0.4% by mass of binder), the time to corrosion initiation of untreated and silane treated concrete was predicted for particular cover depths. The results indicate that the silane penetration depth is highly dependent on the quality (porosity) and moisture content of the near surface zone as deeper penetration was recorded in the higher w/b ratio and poor-quality concrete mixes. Silane impregnation also reduced the capillary absorption and chloride conductivity for all the mixes. In terms of the bulk diffusion test, chloride ingress in the treated concrete mixes was suppressed and lower chloride surface concentration (Cs) and apparent chloride diffusion coefficient (Da) were recorded. The influence of silane impregnation on carbonation was negligible in the w/b = 0.45 concrete mixes while a slight decrease in carbonation depth was observed in the w/b = 0.60 concrete mixes. The relative humidity of treated concrete (near the surface) initially increased relative to the untreated concrete. However, the difference in relative humidity between silane-treated and untreated concrete is reduced with time. Higher chloride concentrations were measured in the cracked concrete at depths of 50-60 mm compared to the uncracked concrete. Greater chloride ingress was also recorded in the 0.6 mm crack width relative to the 0.2 mm crack width. For a particular crack width, chloride ingress in cracked concrete was influenced by the type of binder; a significant reduction in chloride content was recorded in the cracked slag (GGCS and CEM III/B) concrete mixes relative to the CEM I mix. The results also suggest that silane impregnation reduces chloride ingress in cracked concrete (up to a crack with of 0.6 mm) and consequently minimises the risk of premature reinforcement corrosion initiation, especially in slag concrete. The service life prediction results emphasized the importance of adequate cover depths in the extreme marine exposure class (XS3) and highlighted the superior performance of slag concrete relative to CEM I concrete. A lower rate of chloride ingress was predicted in the silane treated concrete and consequently to achieve the same time to corrosion initiation, smaller cover depths are required. Alternatively, the results also show that the initiation period of rebar corrosion in structures with insufficient cover depth and quality can be effectively extended using silane impregnation.

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Maleki, Elaheh. "A Systems Engineering-based semantic model to support “Product-Service System” life cycle". Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0064/document.

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Les Systèmes Produit-Service (PSS) résultent d'une intégration de composants hétérogènes couvrant à la fois des aspects matériels et immatériels (mécanique, électrique,logiciel, processus, organisation, etc.). Le processus de développement d’un PSS est fortement collaboratif impliquant des acteurs métier très variés.Ce caractère interdisciplinaire nécessite des référentiels sémantiques standardisés pour gérer la multitude des points de vue métier et faciliter l’intégration de tous les composants hétérogènes dans un système unique. Ceci est encore plus complexe dans le cas des PSS personnalisables, majoritaires dans le milieu industriel. Malgré les nombreuses méthodologies dans littérature, la gestion des processus de développement du PSS reste encore limitée face à cette complexité. Dans ce contexte, l'Ingénierie des systèmes (IS) pourrait être une solution avantageuse au regard de ses qualités bien prouvé pour la modélisation et la gestion de systèmes complexes. Cette thèse vise à explorer le potentiel d'utilisation de l'Ingénierie des systèmes (IS) comme fondement conceptuel pour représenter d’une façon intégrée tous les différents points de vue métier associés au cycle de vie du PSS. Dans ce cadre, un méta-modèle de PSS est proposé et exemplifié dans des cas industriels. Un modèle ontologique est aussi présenté comme une application d’une partie des modèles pour structurer le référentiel commun de la plateforme ICP4Life
Product-service systems (PSS) result from the integration of heterogeneous components covering both tangible and intangible aspects(mechanical, electrical, software, process, organization, etc.). The process of developing PSS is highly collaborative involving a wide variety of stakeholders. This interdisciplinary nature requires standardized semantic repositories to handle the multitude of business views and facilitate the integration of all heterogeneous components into a single system. This is even more complex in the case of customizable PSS in the industrial sector. Despite the many methodologies in literature, the management of the development processes of the PSS is still limited to face this complexity. In this context, Systems Engineering (SE) could bean advantageous solution in terms of its proven qualities for the modeling and management of complex systems. This thesis aims at exploring the potentials of Systems Engineering (SE) as a conceptual foundation to represent various different business perspectives associated with the life cycle of the PSS. In this context, a meta-model for PSS is proposed and verified in industrial cases. An ontological model is also presented as an application of a part of the model to structure the common repository of the ICP4Life platform

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Rahman, A. B. M. Mostafizur. "Assessment of Bridge Service Life Using Wireless Sensor Network". Youngstown State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1340424183.

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Yu, Jianxiong. "Pavement Service Life Estimation And Condition Prediction". See Full Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2005. http://www.ohiolink.edu/etd/view.cgi?toledo1132896646.

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Dissertation (Ph.D.)--University of Toledo, 2005.
Typescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Engineering." Bibliography: leaves 69-74.

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Ali, Muhammad Shafqat. "Enhancement of service life of prestressed concrete bridge girders using FRP composites". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123187.

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This research aims at enhancing the service life of the prestressed concrete bridge girders, using fiber-reinforced polymer (FRP) composite shell on the lower flange to impede the ingress of deleterious elements into the concrete. The FRP shell would help to retard the resulting deterioration reactions and achieve more durable bridges for a considerably increased service life. The behavior of prestressed concrete bridge girders with FRP shells on the tension flange was investigated experimentally.The flexural characteristics of FRP shell and concrete interface along with the effect of the steel reinforcement ratio were studied experimentally. This FRP shell was bonded around the lower part of the concrete beams, constructed with four different reinforcement ratios. The beam specimens with the FRP shell showed a significant enhancement in their strength, stiffness and energy absorption capacities, as compared with the associated control beams. The flexural behavior of cast-in-place prestressed concrete beams with FRP shell was studied to examine the contribution of the bonded FRP shell to the strength, stiffness, ductility and energy absorption capacity of prestressed concrete beam specimens, for five different levels of prestressing. The initial cracking, yield and ultimate strengths of the beam specimens with FRP shell were significantly higher than those of the associated control beam specimens. The FRP shell and the prestressing force enhanced the strength and stiffness of the beams. The long-term durability of the FRP shell to act as a barrier against ingress of aggressive elements, such as moisture and chlorides into the proposed FRP shell-concrete system, was examined experimentally in a preliminary manner. Detailed tests on concrete specimens reinforced externally with FRP shells subjected to accelerated moisture and salt solution at control temperatures were performed. In addition, scanning electron microscopy (SEM) was used to determine the effects caused by aging, with time, temperature and chloride injection pressure. The FRP shell, acting as a barrier, showed a significant resistance against chloride ingress by significantly slowing down the chlorides ingress rate and the total amount of chlorides. For a prestressed concrete girder with an FRP shell, the accumulated time for chloride penetration and reaching the level of prestressing steel strands was predicted to be more than 135 years. These results suggest that the FRP shell is quite effective in improving the durability characteristics of prestressed concrete girders and can significantly extend their service life.
Cette recherche vise à améliorer la durée de vie des poutres de pont en béton précontraint à l'aide de coquilles de composite de polymères renforcés de fibres (FRP) appliquées à la semelle inférieure pour empêcher l'infiltration d'éléments nocifs dans le béton. La coque en FRP permettrait de retarder les réactions de détérioration et de réaliser des ponts plus durables ayant une durée de vie considérablement accrue. Le comportement de ces poutres de a été étudié expérimentalement. Les caractéristiques en flexion de la coquille en FRP et de son interface de béton ainsi que de l'effet du pourcentage d'armature d'acier ont été étudiés expérimentalement. La coquille en FRP a été collée autour de la partie inférieure de poutres béton construites avec quatre pourcentages d'armature. Les spécimens de poutres avec la coquille de FRP ont montré une amélioration significative dans leurs résistances, rigidités et capacités d'absorption d'énergie par rapport aux poutres sans coquilles. Le comportement en flexion de poutres de béton précontraint coulées en place avec la coquille de FRP a été étudié afin d'examiner la contribution de la coquille à la résistance, rigidité, ductilité et capacité d'absorption d'énergie pour cinq pourcentages de précontraintes. La limite de fissuration, la limite d'élasticité et la limite ultime des spécimens avec FRP étaient sensiblement supérieures à ceux des spécimens sans coquille. La coquille en FRP et la force de précontrainte a amélioré la résistance et la rigidité des poutres. La contribution à la durabilité à long terme de la coquille de FRP contre les infiltrations d'éléments agressifs dans la coquille et le béton, tels que l'humidité et les chlorures, a été étudiée expérimentalement de façon préliminaire. Des tests accélérés sur des échantillons de béton renforcés extérieurement avec des coquilles de FRP ont été effectuées en les soumettant à l'humidité et une solution saline à température contrôlées. La microscopie électronique (SEM) a aussi été utilisée pour déterminer les effets du vieillissement par rapport au temps d'exposition, à la pression d'injection, à la température et aux chlorures. La coquille de FRP, agissant comme une barrière, a augmenté significativement la résistance contre la pénétration des chlorures en réduisant significativement le taux de pénétration des chlorures et de la quantité totale d'ions chlorure. Pour une poutre en béton précontraint avec une coque en FRP, le temps total pour que les ions chlorure atteignent les câbles d'acier de précontrainte est estimé à 135 ans. Ces résultats suggèrent que la coquille de FRP est très efficace pour améliorer la longévité des poutres en béton précontraints et peut allonger considérablement leur durée de vie.

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Thorsell, Thomas I. "Vacuum insulation in buildings : means to prolog service life". Licentiate thesis, KTH, Civil and Architectural Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4149.

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Vacuum insulation panels, VIPs, constitute a new insulation material, 6 to 8 times better than traditional insulation materials, which utilizes the positive influence vacuum has on the thermal properties of certain materials. A VIP is a composite with a flat core enclosed by an envelope preventing the core to fill with gas. The vacuum in the core is vital to reach thermal conductivities down to 0,0035 W/(m K), if the vacuum is lost the panel has reached the end of its service life time. Metal sheets would the preferred material to create an impermeable envelope but would creates a large thermal bridge at the edges of a panel when it folds over the edges of the panel.

A serpentine edge has been proposed in order to deal with this large thermal bridge. This serpentine edge has been evaluated first as a numeric model in software and then by measuring on a prototype edge element in a hot and cold plate instrument. Measured temperatures were used to validate the numerical model. Results show that a serpentine edge can greatly reduce the thermal bridge if designed correctly.

Another direction taken in the development of the VIP barrier is to use very thin metal layers, metallization layer or coating, incorporated into multi layered polymer composite film. This creates barrier films with very good barrier properties and only small thermal bridges. The modeling of gas flux through films with more than one coating has only just started. Existing models for flux through multi coated films all assume that flux is only taking place through defects in the coating layers, that all defects are of the same size and that all defects are positioned in square lattices. The model discussed herein use the same assumption of flux through pinholes only but it does take defect sizes and positions into account. Barrier film, from a regular vacuum insulation panel, with double coatings has been evaluated in light microscopy to characterize the defects in each of the coatings. The data found have been fed into the model and the results comply well with reported permeabilities of similar barrier films.

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Più fonti

Libri sul tema "Service life (Engineering)"

Martin, Jonathan W. Service Life Prediction of Polymeric Materials: Global Perspectives. Boston, MA: Springer US, 2009.

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Fishman, Kenneth L. LRFD metal loss and service-life strength reduction factors for metal-reinforced systems. Washington, D.C: Transportation Research Board, 2011.

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N, Parkins Redvers, e National Association of Corrosion Engineers., a cura di. Life prediction of corrodible structures. Houston, TX: NACE International, 1994.

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J, Solin, e Valtion teknillinen tutkimuskeskus, a cura di. Plant life management: Progress for structural integrity. Espoo, Finland: VTT, 2003.

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Martin, Jonathan W. Methodologies for predicting the service lives of coating systems. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1994.

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J, Solin, e Valtion teknillinen tutkimuskeskus, a cura di. Plant life management: Midterm status of a R & D project. Espoo, Finland: VTT, 2001.

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Spath, Pamela L. Life cycle assessment of coal-fired power production. Golden, Colo. (1617 Cole Blvd., Golden 880401-3393): National Renewable Energy Laboratory, 1999.

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Bement, Laurence J. Approach for service life extension of explosive devices for aircraft escape systems. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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Podio, Fernando L. Development of a testing methodology to predict optical disk life expectancy values. Gaithersburg, MD: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1991.

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Podio, Fernando L. Development of a testing methodology to predict optical disk life expectancy values. Gaithersburg, MD: U.S. Dept. of Commerce, National Institute of Standards and Technology, 1991.

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Capitoli di libri sul tema "Service life (Engineering)"

Charrett, Donald. "Design life or service life". In Contracts for Construction and Engineering Projects, 77–94. 2^a ed. London: Informa Law from Routledge, 2021. http://dx.doi.org/10.4324/9781003206897-8.

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Wang, W., e M. J. Carr. "Component Level Replacements: Estimating Remaining Useful Life". In Complex Engineering Service Systems, 297–314. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-189-9_16.

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Fu, Ming Wang. "Die Design and Service Life Analysis". In Engineering Materials and Processes, 95–130. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46464-0_4.

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Wittern, Erik, e Robin Fischer. "A Life-Cycle Model for Software Service Engineering". In Service-Oriented and Cloud Computing, 164–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40651-5_13.

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Tasker, Paul, Andy Shaw, Ben Sheridan e Sarah Kelly. "TES Service Innovation and the Role of Standards". In Through-life Engineering Services, 359–71. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12111-6_21.

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Gromadova, Monika. "Service Life of the Cam Mechanisms". In Lecture Notes in Civil Engineering, 243–55. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9121-1_19.

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Rozenfeld, Henrique, Maiara Rosa, Sânia da Costa Fernandes, Marina de Pádua Pieroni, Carolina Queiroz Souza, Érica Gonçalves Rezende e Cristina Targas Gurian. "Product-Service Systems (PSS)". In Life Cycle Engineering and Management of Products, 205–33. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78044-9_9.

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Hingorani, Ramon, e Peter Tanner. "Application of risk analysis in structural engineering – gas explosions". In Advances in Modeling Concrete Service Life, 65–78. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2703-8_7.

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Lingegård, Sofia, e Mattias Lindahl. "Identification of Risks Related to Integrated Product Service Offerings of Rail Infrastructure: A Swedish Case". In Through-life Engineering Services, 323–40. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12111-6_19.

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He, Yu Ting, Hong Peng Li, Feng Li e Chao Hua Fan. "Study on the Service Life of Electronic Equipment". In Key Engineering Materials, 2896–99. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-456-1.2896.

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Atti di convegni sul tema "Service life (Engineering)"

Suhardi, Novianto Budi Kurniawan e Jaka Sembiring. "Service computing system engineering life cycle". In 2017 4th International Conference on Electrical Engineering, Computer Science and Informatics (EECSI). IEEE, 2017. http://dx.doi.org/10.1109/eecsi.2017.8239136.

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Jensen, Jakob Laigaar, Lars Jensen, Matias Valenzuela e Raul Vasquez. "Service Life Performance Design of Chacao Bridge". In IABSE Symposium, Vancouver 2017: Engineering the Future. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2017. http://dx.doi.org/10.2749/vancouver.2017.2816.

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Franke, Dominik, Corinna Elsemann e Stefan Kowalewski. "Reverse Engineering and Testing Service Life Cycles of Mobile Platforms". In 2012 23rd International Workshop on Database and Expert Systems Applications (DEXA). IEEE, 2012. http://dx.doi.org/10.1109/dexa.2012.40.

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Gao Na, Zhao Songzheng e Liu Jing. "Research service design based on product life cycle for service-oriented manufacturing". In 2010 2nd International Conference on Information Science and Engineering (ICISE). IEEE, 2010. http://dx.doi.org/10.1109/icise.2010.5691675.

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De Luca, Antonio, Zhi Zhang e Liling Cao. "Service Life Prediction of Concrete Parking Structures: Case Studies". In Ninth Congress on Forensic Engineering. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484548.020.

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Tatum, Nathan, Sven Rodenbeck e Robert C. Williams. "Engineering for Life: A History of the Public Health Service Engineers". In Third National Congress on Civil Engineering History and Heritage. Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40594(265)45.

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Savage, M. "Parabolic Log-Log Fatigue Life Model". In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/rsafp-14470.

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Abstract A rapid method for determining service fatigue strength data is to test the product or device at an elevated load. Load-life relationships for engineering materials normally show a large reduction in life for a small increase in load. Unfortunately, there is little agreement on the exact nature of this load-life relationship. Some sources show a linear semi-log relationship. Some show a single linear log-log relationship. And some show a two-line log-log relationship with the shallower slope line active after ten-million load cycles or more. The two-line relationship agrees more closely with expected behavior. It predicts a difference between the load-life characteristics in the field at moderate service loads and the load-life characteristics in the laboratory with high test loads. However, the determination of the location and slope of the second, shallow, high-life line is an expensive proposition. In this paper, a parabolic log-log load-life model which predicts a gradual transition from the short-life testing environment to the long-life use environment is presented and compared to the two linear models. Fitting the model to test data is described as is the use of the model in planning tests for failure prevention prediction.

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Trunov, N. B., V. S. Popadchuk, S. E. Davidenko e R. Ju Zhukov. "Actual Problems of VVER SG Tubing Service Life Management". In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75096.

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Reliable operation of steam generator heat exchanging tubes is the major problem for NPPs of different types. The paper deals with current approaches to horizontal steam generator tubes inspection and plugging and the actual problems of service life management. The causes and laws of tubing corrosion degradation are considered using the information - analytical system. The results of SG prototype corrosion tests are presented. A possibility of corrosion degradation process management is demonstrated. The experimental verification was made to prove the possibility of flaws initiation under standby modes. The methodology of the plugging criteria choosing and the proposals on their optimization are given. The studies are provided for pressure loading of the tubes with real flaws. The recommendations are given for improving of SG operation.

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Xu, Xun, e Shi-zhong Qiang. "Damage Safety Assessment and Service Life Prediction of Bridges". In First International Conference on Transportation Engineering. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/40932(246)365.

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Tanimoto, Shigeaki, Ken Takahashi, Taro Yabuki, Kazuhiko Kato, Motoi Iwashita, Hiroyuki Sato e Atsushi Kanai. "Risk assessment quantification in life log service". In 2014 15th IEEE/ACIS International Conference on Software Engineering, Artificial Intelligence, Networking and Parallel/Distributed Computing (SNPD). IEEE, 2014. http://dx.doi.org/10.1109/snpd.2014.6888723.

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Rapporti di organizzazioni sul tema "Service life (Engineering)"

Cooke. L51783 100000 Hour Design Life of Turbo Compressor Packages. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), gennaio 1998. http://dx.doi.org/10.55274/r0010340.

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The gas pipeline industry continues to respond to the challenges of competitive markets and the need to manage the cost of service effectively. A major cost element being reviewed by the industry is the operating and maintenance expense for its fleet of older turbo compressor units. Many turbo-machinery manufacturers and operators typically quote 100,000 hours as a design limit for service life of turbo compressor components. The Pipeline Research Committee initiated this study to review the life limiting criteria for certain critical components and determine if the design target of 100,000 hours can be safely and reliably met or extended with special component management practices. The first phase of the project was to select the turbomachinery components that would be included in the review. Committee members were surveyed with a detailed questionnaire designed to identify critical components based on: high hours (eg. at or approaching 100,000 hours), the most common engine types operated by the member organizations, and the components of greatest concern from a risk and expense point of view. The selection made covers a wide range of engine types that are of interest to most of the committee companies. This selection represents some 78% of the "high hour" units operated by the committee and includes components from GE Frame 3 and Frame 5, Solar Saturn, Rolls Royce Avon, and Cooper RT56 engines. The report goes into detail regarding the various damage mechanisms which can be the main life limiting factor of the component; creep, fatigue, environmental attack, wear and microstructure instability. For each of the component types selected, the study identifies the life limiting criteria and outlines how the components may be managed for extended life. Many of the selected components can be reliably operated beyond 100,000 hours by following the management practices set out in the report. The decision to continue to operate components or replace with new components is usually based on either a predetermined engineering life limit or retirement for cause. Operating life limits are based on engineering calculations that establish the component life, beyond which the risk of failure is high. Such limits assume a standard, or most often, a worst case set of operating conditions to be conservative for all types of service. Retirement for cause is based on specific inspection techniques applied at appropriate intervals to ensure that damage below a defined limit is identified and the parts are then removed for either refurbishment or retirement.

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Smalley, A. J., e P. J. Pantermuehl. TR-97-2 Foundation Guidelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), gennaio 1997. http://dx.doi.org/10.55274/r0011730.

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These guidelines provide guidance to engineers responsible for installing or repamng the foundations of reciprocating compressors. If followed, the guidance should help assure an installation with a long life of trouble-free service. They address, in particular, mechanical integrity of the compressor/foundation installation, with emphasis on design of mounts, anchor bolts, and foundation block to carry the required dynamic loads. They defer to existing texts on vibration engineering for foundation blocks on their soil.

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Jaske e Hart. L52047 PRCI Pipeline Repair Manual 6th Edition. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), agosto 2006. http://dx.doi.org/10.55274/r0010249.

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Note the PRCI Pipeline Repair Manual 2021 Edition is now available and supersedes this edition. The 2021 Edition is available here. Technology advancements in materials, techniques, new products, procedures, etc. offer pipeline companies the opportunity to extend the safe life of assets in place. A comprehensive Pipeline Repair Manual is needed to address these new advances, provide engineering guidance to choose appropriate repair techniques for specific defects in pipelines. This new updated Pipeline Repair Manual provides guidance to pipeline operators as they: (1) choose appropriate repair techniques for specific defects in in-service pipelines; (2) develop or enhance their own procedures and/or manuals for pipeline repairs; (3) or train or qualify maintenance personnel. The manual presents a catalog of known pipeline repair techniques, and discusses the various types of pipeline defects that lend themselves to being repaired while in-service. A matrix is provided to match defects in need of repair with appropriate repair methods. In addition defect assessment methods are presented as are safety considerations related to making in-service repairs. The manual is divided into the following major sections: (1) Response to the discovery of an anomaly or defect - this section presents safety issues and defines critical information that is required to make an appropriate repair response. (2) Pipeline repair methods - this section describes the known methods of repairing in-service pipelines. (3) Appropriate repairs for various types of defects - this section matches the types of defects that are likely to be encountered in in-service pipelines with appropriate repair methods. (4) Repair methods in Europe - this section was added after a review of the draft by a committee of pipeline repair specialists from several European pipeline operators who are members of the Group Europeene de Recherches Gazieres (GERG). It contains suggestions made by the committee to enhance the substance of this manual and to inform readers concerning European practices. (5) Guidelines for repair procedures - this section presents a model procedure, which a pipeline operator may use to create, enhance, or evaluate repair procedures. This document was formerly known as 'Updated Pipeline Repair Manual Revision 6'

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Tiku, Sanjay, Binoy John e Arnav Rana. PR-214-183816-R01 Full-scale Fatigue Testing of Field Dents. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), gennaio 2022. http://dx.doi.org/10.55274/r0012202.

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Significant effort has been spent in understanding dent fatigue behavior and developing engineering assessment tools for dent integrity management involving full-scale dent testing and numerical modeling through Pipeline Research Council International (PRCI), United States Department of Transportation (DOT) and Canadian Energy Pipeline Association (CEPA) sponsored research [1][2][3][4][5]. The results of the research work have been incorporated in American Petroleum Institute (API) recommended practice (RP), API RP 1183 [6]. The assessment tools have been validated and calibrated against full-scale dent fatigue tests. The experimental database of dent full-scale fatigue tests; however, consisted of dents created in the laboratory and the majority of these were created using dome shaped (semi-elliptical end caps) indenters. The current project scope was developed to address the specific gap between fabricated samples developed for full-scale test and real world samples, and to provide further validation of the dent fatigue life assessment methodologies incorporated in API RP 1183[6]. The field dents tested under the current project ranged in depth from 0.6 % to 11 % and included pipe samples with diameters ranging from 10" OD to 40" OD. The experimental data generated using former in-service pipeline samples was used to assess and validate the Level 2 and Level 3 dent fatigue assessment tools incorporated in API RP 1183 and support the improved management of mechanical damage so that dig programs can be better managed and the resources effectively utilized by the operating companies. Related webinar

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Lazor, Robert B. DTRS56-03-T-0011 Validation of Sleeve Weld Integrity and Workmanship Level Development. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luglio 2006. http://dx.doi.org/10.55274/r0012038.

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This project was initiated to support a methodology for conducting an engineering assessment to determine the tolerable dimensions of flaw indications at full encirclement repair sleeve welds. The work described herein has been undertaken to validate the stresses estimated in finite element analysis (FEA) models against actual in-service loading conditions experienced at reinforcing sleeves. This project was intended to prove the feasibility of the concept and to provide details that could be incorporated into a future guidance note on sleeve installation procedures. The following general tasks were undertaken: (1) Collection of full-scale structural behavior data during the sleeve installation process and during line operation;, (2) Calibration of a sleeve weld finite element model against field data; and (3) Demonstration of the model as a design tool.

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Tiku, Sanjay, Arnav Rana, Binoy John e Aaron Dinovitzer. PR-214-203805-R01 Performance Evaluation of ILI Systems for Dents and Coincident Features. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), marzo 2024. http://dx.doi.org/10.55274/r0000056.

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Pipeline integrity management involves the analysis of pipeline condition information (e.g., pipe size, presence and size of features), operational/environmental conditions and line pipe material properties in engineering assessment (fitness-for-purpose) tools to evaluate operational risk. While nominal or minimum specified material properties and SCADA reported, design or estimated operational loading conditions can be considered, pipeline operators depend heavily on pipeline condition data from in-line inspection (ILI) systems. The current project presents the details of performance trials evaluating the ability of ILI systems to provide pipeline condition information for dents with coincident or closely aligned features. A set of sample dent features were prepared along with a trial protocol and performance metrics beyond those presented in API 1163 that were used to characterize performance. ILI system pull and pump through trials of magnetic, ultrasonic and caliper-based ILI technologies from four ILI Service Providers were performed. Data from these trials were used to quantify detection, identification, and sizing performance of the ILI systems for isolated corrosion features, dents with variety of shapes including those without coincident features and those with corrosion, gouges and/or cracks. The effect of dents on the ILI system detection, identification and sizing of the coincident features was evaluated.

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Tiku, Sanjay. PR-214-203820-R01 Performance Evaluation of ILI for Dents with Cracks and Gouges. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), luglio 2023. http://dx.doi.org/10.55274/r0000031.

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Pipeline integrity management involves the analysis of pipeline condition information (e.g., pipe size, presence and size of features), operational/environmental conditions and line pipe material properties in engineering assessment (fitness-for-purpose) tools to evaluate operational risk. While nominal or minimum specified material properties and SCADA reported, design or estimated operational loading conditions can be considered, pipeline operators depend heavily on pipeline condition data from in-line inspection (ILI) systems. The current project presents the details of performance trials evaluating the ability of ILI systems to provide pipeline condition information for dents with coincident or closely aligned features. A set of sample dent features were prepared along with a trial protocol and performance metrics beyond those presented in API 1163 that were used to characterize performance. ILI system pull and pump through trials of magnetic, ultrasonic and caliper-based ILI technologies from seven ILI Service Providers were performed. Data from these trials were used to quantify detection, identification, and sizing performance of the ILI systems for isolated corrosion features, dents with variety of shapes including those without coincident features and those with corrosion, gouges and/or cracks. The effect of dents on the ILI system detection, identification and sizing of the coincident features was evaluated.

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Chauhan, Priyanshi, e Ria Sinha. Bridging Perspectives: Innovative Finance Insights from India. Indian School Of Development Management, settembre 2023. http://dx.doi.org/10.58178/2309.1026.

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This case study engages with the journey of Dhwani Rural Information Systems, a social enterprise that traces its earliest origins back to 2012. Founded by the duo of Sunandan Madan and Swapnil Aggarwal – engineers by training who met while studying for a postgraduate course at the Institute of Rural Management Anand (IRMA) – Dhwani since its inception has been trying to help a range of social sector organizations effectively integrate technology without disrupting the core ways in which these organizations work. Notably, it has been amongst one of the early enterprises in the sector which has taken efforts to understand in-depth the technology-related “pain points” common across organizations, and to bring a degree of standardisation to their solutions. The case builds an appreciation towards the fact that at the core of a successful technology-centric social enterprise, which can offer relevant and affordable digital products and services to the sector, lies building a composite culture that can straddle both the developmental and technological landscapes. Such a culture seeks to combine engineering and consulting skills in equal measure, and seeks to solve problems mindful of the particularities of the developmental sector, while also retaining a service orientation. In particular, the case looks to draw attention to the ideas of hybridity and elasticity that are integral to such a culture and how these have to be sustained against continuous pressures of talent sourcing, compensation, retention, and learning and development. In a short period of time, Dhwani has become a mature set-up with a clear sector-agnostic product and service value proposition to the sector, with a team strength of over 120 people and over 50 projects, and a variety of organizations, including nonprofits, philanthropies, CSR divisions and governments as clients. Therefore, the experiences of the founders and members of the team offer valuable lessons for other like-minded practitioners. At the same time, to researchers in the field of social enterprise the case may provide a more granular view of important aspects of culture-building in emerging social enterprises. The fact that such enterprises have to draw from a talent pool in constant competition with their private sector counterparts imparts added force to the above considerations.

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Rao, Menaka, Shantanu Menon e Kushagra Merchant. Dhwani Rural Information Systems: Bridgnig the Technological divide. Indian School Of Development Management, giugno 2023. http://dx.doi.org/10.58178/2306.1025.

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Peña, Ignacio, e Micaela Jenik. Deep Tech: The New Wave. Inter-American Development Bank, giugno 2023. http://dx.doi.org/10.18235/0004947.

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DeepTech startups are companies based on a scientific discovery or meaningful engineering innovation. Deep Tech startups involve significant technological risk and R&D. However, Deep Tech innovation is critical to effectively address humanities grand challenges. DeepTech companies have the potential to catalyze change, establish new industries, and disrupt existing ones. Cutting-edge technologies like AI, solar power, electric vehicles, biotech, advanced manufacturing, and space-based broadband have the potential to pave new paths for economic growth, social equity, and environmental sustainability in the region. Today, with 340 ventured-back DeepTech startups, the DeepTech ecosystem in LAC is valued at USD 8 billion and has much potential to grow. The LAC region has strong advantages such as talent and R&D cost, to further develop and grow the DeepTech ecosystem in LAC. By fostering DeepTech in the region, LAC countries will benefit from the creation of jobs, as well as from potential access to improved basic products and services. Poor and vulnerable communities may greatly benefit from the adoption and creation of new technologies.

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