Thematische Bibliographien / Technical cleanliness

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Auswahl der wissenschaftlichen Literatur zum Thema „Technical cleanliness“

Autor: Grafiati

Veröffentlicht am 30. Juni 2021

Zuletzt aktualisiert am 26. April 2022

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Zeitschriftenartikel zum Thema "Technical cleanliness"

FABER, Joanna, Krzysztof BRODZIK und Marta NYCZ. „Understanding technical cleanliness: importance, assessment, maintenance“. Combustion Engines 186, Nr. 3 (13.09.2021): 41–50. http://dx.doi.org/10.19206/ce-140531.

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Development of the automotive industry, including so-called dowsizing and rightsizing, entails the need to ensure, and hence to verify, the stringent cleanliness levels of an increasing number of car components. The assurance of proper cleanliness level requires knowledge of the entire production process and precise information on the contaminants that will allow to identify their sources. Obtaining reliable cleanliness information requires establishing of many different factors, i. a. selection of proper contamination extraction and collection technique, proper parameters of extraction, validation of extraction procedure, methods of particles analysis. Analytical techniques which are implemented include gravimetric, optical microscopy and advanced techniques like scanning electron microscopy. This work present’s actual state of knowledge regarding technical cleanliness analysis of components. Important aspects of QA&QC in technical cleanliness assessment are also discussed.

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Koblenzer, Gerhard. „The Highest Standards of Technical Cleanliness“. IST International Surface Technology 13, Nr. 1 (März 2020): 40–41. http://dx.doi.org/10.1007/s35724-019-0084-4.

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Oravec, Milan, Adriana Divoková, Pavol Lipovský, Michal Karásek und Róbert Janošík. „Technical Cleanliness - a Requirement of Precision Manufacturing“. Acta Mechanica Slovaca 23, Nr. 4 (22.08.2020): 46–51. http://dx.doi.org/10.21496/ams.2020.008.

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Vecchio, Irene, Katja Schladitz, Michael Godehardt und Markus J. Heneka. „3D GEOMETRIC CHARACTERIZATION OF PARTICLES APPLIED TO TECHNICAL CLEANLINESS“. Image Analysis & Stereology 31, Nr. 3 (14.11.2012): 163. http://dx.doi.org/10.5566/ias.v31.p163-174.

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During production of mechanical components, residual dirt collects on the surfaces, thus creating a contamination that affects the durability of the assembled products. Residual particles are currently analyzed based on microscopic 2d images. However, the particle's shape is decisive for the damage it can cause, yet can not be judged reliably from 2d data. Micro-computed tomography allows to capture the complex spatial structures of thousands of particles simultaneously. Now new methods to characterize three dimensional shapes are needed to establish 3d cleanliness analysis. In this work, unambiguously indicative geometric features are defined and it is investigated how they can yield a reliable classification in three typical classes: fibers, chips and granules. Finally, the efficiency of the proposed method is proved by analyzing samples of real dirt particles.

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Haarhoff, J., und S. Van Staden. „Technical note: Measurement and expression of granular filter cleanliness“. Water SA 39, Nr. 5 (16.10.2013): 701. http://dx.doi.org/10.4314/wsa.v39i5.15.

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Borde, Yannick, Adrien Danel, A. Roche, Hervé Fontaine und C. Brych. „Cleanliness Management in Advanced Microelectronic“. Solid State Phenomena 145-146 (Januar 2009): 159–62. http://dx.doi.org/10.4028/www.scientific.net/ssp.145-146.159.

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After technical results presented the last two years and new results on volatile contamination, this paper reviews the contamination management in advanced microelectronic and proposes rules for advanced Integrated Circuits (IC) manufacturing. The competitiveness of a production line is insured only if right contamination management rules are applied. These rules must allow a fast introduction of disruptive technologies while keeping as low as possible associated costs: processing on shared equipments, determination of acceptable levels of contamination with a good understanding of their detrimental impact on devices, knowledge on contamination dissemination mechanisms. Moreover, a control of contamination using appropriate cleanings and metrologies is mandatory.

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Englert, Tim, Florian Gruber, Jan Stiedl, Simon Green, Timo Jacob, Karsten Rebner und Wulf Grählert. „Use of Hyperspectral Imaging for the Quantification of Organic Contaminants on Copper Surfaces for Electronic Applications“. Sensors 21, Nr. 16 (19.08.2021): 5595. http://dx.doi.org/10.3390/s21165595.

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To correctly assess the cleanliness of technical surfaces in a production process, corresponding online monitoring systems must provide sufficient data. A promising method for fast, large-area, and non-contact monitoring is hyperspectral imaging (HSI), which was used in this paper for the detection and quantification of organic surface contaminations. Depending on the cleaning parameter constellation, different levels of organic residues remained on the surface. Afterwards, the cleanliness was determined by the carbon content in the atom percent on the sample surfaces, characterized by XPS and AES. The HSI data and the XPS measurements were correlated, using machine learning methods, to generate a predictive model for the carbon content of the surface. The regression algorithms elastic net, random forest regression, and support vector machine regression were used. Overall, the developed method was able to quantify organic contaminations on technical surfaces. The best regression model found was a random forest model, which achieved an R2 of 0.7 and an RMSE of 7.65 At.-% C. Due to the easy-to-use measurement and the fast evaluation by machine learning, the method seems suitable for an online monitoring system. However, the results also show that further experiments are necessary to improve the quality of the prediction models.

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Chu, Hong Yu, Zhi Jiang Xie, Xu Xu, Li Dan Zhou und Qin Liu. „Detection Status of Surface Defect for Precise Optical Element“. Advanced Materials Research 291-294 (Juli 2011): 1733–37. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1733.

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The optical surface defects have a significant impact on functions and reliability of the whole optical system. In recent years, with the great attention on research of large-scale high-power solid-state laser device at home and abroad, the detection of optical surface defect has also been highly valued. Through continuous exploration, defect detection technology has made some achievements, but there are still some urgent technical problems to be solved. In this paper, the technology situation of optical surface defect will be summarized in two aspects: the surface cleanliness and surface flaws. Moreover, the technical difficulties and the problems which are currently facing will be analysis.

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Cheng, Xiaofeng, Xinxiang Miao, Hongbin Wang, Lang Qin, Yayun Ye, Qun He, Zhiqiang Ma, Longbiao Zhao und Shaobo He. „Surface Contaminant Control Technologies to Improve Laser Damage Resistance of Optics“. Advances in Condensed Matter Physics 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/974245.

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The large high-power solid lasers, such as the National Ignition Facility (NIF) of America and the Shenguang-III (SG-III) laser facility of China, can output over 2.1 MJ laser pulse for the inertial confinement fusion (ICF) experiments. Because of the enhancement of operating flux and the expansion of laser driver scale, the problem of contamination seriously influences their construction period and operation life. During irradiation by intense laser beams, the contaminants on the metallic surface of beam tubes can be transmitted to the optical surfaces and lead to damage of optical components. For the high-power solid-state laser facilities, contamination control focuses on the slab amplifiers, spatial filters, and final-optical assemblies. In this paper, an effective solution to control contaminations including the whole process of the laser driver is put forward to provide the safe operation of laser facilities, and the detailed technical methods of contamination control such as washing, cleanliness metrology, and cleanliness protecting are also introduced to reduce the probability of laser-induced damage of optics. The experimental results show that the cleanliness level of SG-III laser facility is much better to ensure that the laser facility can safely operate at high energy flux.

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Shaik, Aqueeb Sohail, und Lewlyn L. R. Rodrigues. „Plant layout optimisation with implementation of technical cleanliness in an automotive industry: a system dynamics approach“. International Journal of Technology, Policy and Management 18, Nr. 3 (2018): 201. http://dx.doi.org/10.1504/ijtpm.2018.093850.

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Dissertationen zum Thema "Technical cleanliness"

Mostafaee, Mani. „Six Sigma for quality assurance of Lithium-ion batteries in the cell assembly process : A DMAIC field study at Northvolt“. Thesis, Luleå tekniska universitet, Institutionen för ekonomi, teknik, konst och samhälle, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-85966.

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Lack of technical cleanliness and particle contaminations in Lithium-ion battery manufacturing affect the performance of batteries which are a risk for the safety and quality of the product. Therefore, part of the manufacturing process occurs inside the Clean and Dry room area to maintain technical cleanliness. This paper aims to provide a framework to control particle contamination inside the Clean and Dry room and strengthen the product's quality and safety. A literature study was conducted, which was completed by a field study at Northvolt Labs in Västerås to achieve the study's aims. The study contributes to existing theories by providing a framework to find root causes of particle contamination in the manufacturing process based on the existing literature and standards. The Six Sigma problem-solving methodology DMAIC was implemented to conduct the field study. A risk assessment was conducted to find the possible threats toward technical cleanliness in the cell assembly process. The risk sources were identified by implementing measurement methods from relevant standards. The results indicate a high risk for technical cleanliness are coming from the decontamination method, material, machines, and environment. Furthermore, several recommendations were given that are expected to decrease the amount of nonconformity in the process.
Brist på teknisk renhet och partikelföroreningar vid tillverkning av litiumjonbatterier påverkar dess prestanda och utgör en risk för produktens säkerhet och kvalitet. Därför sker en del av tillverkningsprocessen i ett Clean & Dry rum för att upprätthålla teknisk renhet. Denna uppsats syftar till att ge ett ramverk för att kontrollera partikelföroreningar och därmed stärka produktens kvalitet och säkerhet. För att uppnå syftet genomfördes först en litteraturstudie vilket vidare kompletterades med en fältstudie vid Northvolt Labs i Västerås. Studien bidrar till befintliga teorier genom att tillhandahålla ett ramverk för att hitta och åtgärda rotorsaker till partikelkontaminering i tillverkningsprocessen baserat på befintlig litteratur och standarder. Sex Sigma problemlösningsmetoden DMAIC implementerades för att genomföra fältstudien. En riskbedömning genomfördes för att hitta riskfyllda aktiviteter i processen. Vidare implementerades mätmetoder från relevanta standarder för att mäta kontamineringsnivån. Resultaten indikerar stor risk för tekniskrenhet från saneringsmetoder, material, maskiner och miljön. Vidare rekommenderas flera åtgärder för att underhålla tekniskrenhet vilka förväntas minska avvikelser i processen.

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Lima, Ana Beatriz Miranda Peixoto. „Análise e redefinição de processos de Electrostatic Discharge & Technical Cleanliness“. Master's thesis, 2021. http://hdl.handle.net/1822/76064.

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Dissertação de mestrado integrado em Engenharia e Gestão Industrial
A presente dissertação, realizada no âmbito do Mestrado Integrado em Engenharia e Gestão Industrial, foi desenvolvida em contexto industrial na empresa APTIV em Braga com o propósito de realizar a análise e redefinição de processos Electrostatic Discharge e Technical Cleanliness. Inserida no ramo da indústria automóvel, dedica-se à produção de componentes plásticos e eletrónicos para a construção componentes automóveis como rádios, sistemas de navegação e sistemas de controlo. O aumento na complexidade da produção técnica exige novos níveis de controlo de partículas que causam contaminações. A multiplicação da complexidade da produção técnica na indústria automóvel exige condições e componentes de produção limpos. A presença de resíduos em peças e na superfície de dispositivos podem produzir produtos não confiáveis ou com desempenho fraco, provocar interrupções, desperdício de materiais e energia, além da devolução do produto. Adicionalmente, se não existirem medidas anti estáticas, esta poderá interferir com o produto originando a sua falha total, degradação de desempenho, redução da expectativa de vida ou operação instável. A eletricidade estática ou Electrostatic Discharge é um fenómeno físico que nem sempre é fácil de detetar, mas origina perda de produção, de tempo e de matéria-prima. Esta pode, ainda, originar incêndios, choque elétrico em operadores, contaminações e danificações aos componentes eletrónicos sensíveis, requerendo elevados custos de manutenção e/ou reparos. Este projeto consiste na realização de um diagnóstico atual aos processos de Electrostatic Discharge e Technical Cleanliness, identificação das medidas que já estão a ser devidamente utilizadas, reconhecer erros e não conformidades com as normas e diretrizes internacionais e, por fim, propor soluções de melhoria. Assim, estudou-se a possibilidade de integrar os diferentes tipos de medições num sistema de gestão e manutenção de equipamentos, o HolisTech. O objetivo é padronizar processos, garantir qualidade dos equipamentos ao cliente, reduzir a ameaça para a produção e garantir a confiabilidade dos produtos eletrónicos.
This dissertation, carried out under the Integrated Master’s Degree in Engineering and Industrial Management, was developed in an industrial context at the company APTIV in Braga with the purpose of carrying out an analysis and redefinition of Electrostatic Discharge and Technical Cleanliness processes. Inserted in the field of the automotive industry, it is dedicated to the production of plastic and electronic components for the construction of automotive components such as radios, navigation systems and control systems. The increasing complexity of the technical production requires new levels of control of particles that cause contamination. The multiplication of the complexity of technical production in the automotive industries requires clean production and components conditions. The presence of residues on parts and on the surface of devices can produce unreliable or poorly performing products that can lead to malfunctions, the waste of materials and energy, and could result on the return of the product. Additionally, if anti-static measures are not taken, it may interfere with the product causing its total failure, performance degradation, reduced life expectancy or unstable conditions of use. Static electricity or Electrostatic Discharge is a physical phenomenon that is not always easy to detect, but it causes loss of production, time and raw materials, could even create fires, electricity shocks in operators, contamination and damage to sensitive electronic components, requiring high maintenance and/or repair costs. The present project consists of carrying out a current diagnosis of the Electrostatic Discharge and Technical Cleanliness processes, identifying the measures that are already in place, determine errors and non-conformities with the international standards and guidelines and, finally, proposing improvement solutions. Baring that in mind, it was analyzed the possibility of integrating different types of measurements into a management and maintenance system equipment, the HolisTech. The objective is to standardize processes, guarantee the quality of equipment for the customer, reduce the threat to production and guarantee the reliability of electronic products.

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Bücher zum Thema "Technical cleanliness"

Obladen, Michael. Oxford Textbook of the Newborn. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198854807.001.0001.

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This richly illustrated book fills a gap in the literature. It is not another history of famous researchers, but a history of endangered newborns and their fate in medicine and society from the earliest days of human thought, investigating what remained in medieval and persists in modern life. Each chapter rests on exhaustive research in hospital archives, libraries, churches, or excavation fields. With a global perspective, the book identifies technical, medical, social, and political conditions that improved—or compromised—the infant’s quality of life. The newborn’s history has multiple cultural implications. It depended on maternal care, breastfeeding, and cleanliness. Legislation had to protect babies from infanticide and to define the viability of preterm or malformed infants. By tracing the history of legal, philosophical, and social ideas about the newborn, the book develops three overarching themes across societies and times: (1) the newborn was not regarded as a complete human being, but as unfinished and endowed with only partial personhood; (2) rites of passage evolved everywhere, aiming to ‘complete’ the newborn and accept it in family and society; and (3) abandonment and infanticide suggest that many newborns were greeted with ambivalence, and that their frequent death was largely accepted by parents and societies. The book embraces all aspects of the transition from fetal to postnatal life. It will be of major interest to scholars, professionals, and students specializing in obstetrics, midwifery, paediatrics, and neonatology. Medical terminology has been used cautiously and a glossary makes the text accessible outside the health professions.

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Buchteile zum Thema "Technical cleanliness"

Panusch, Thorben, Roman Möhle, Ronny Zwinkau und Jochen Deuse. „Reduction of Human Effort in Technical Cleanliness Inspection Through Advanced Image Processing Approaches“. In Advances in Manufacturing, Production Management and Process Control, 108–15. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80462-6_14.

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Brag, Patrick, und Markus Rochowicz. „Safety in Electromobility – Technical Cleanliness Between the Poles of Design Requirements and Efficient Production“. In Advances in Automotive Production Technology – Theory and Application, 319–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62962-8_37.

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Zwinkau, Ronny, Simon Frentrup, Roman Möhle und Jochen Deuse. „Automatic Particle Classification Through Deep Learning Approaches for Increasing Productivity in the Technical Cleanliness Laboratory“. In Advances in Intelligent Systems and Computing, 34–44. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20040-4_4.

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Sarkar, Asis. „Steel Cleanliness &Sequence Length Improvement through Tundish Configuration &Black Refractories Quality Optimization and by Introducing the Concept of Management“. In Proceedings of the Unified International Technical Conference on Refractories (UNITECR 2013), 631–36. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118837009.ch109.

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Warnecke, Hans-Jürgen, und Bernhard Klumpp. „New Test Procedure for the Examination of the Particulate Cleanliness of Technical Surfaces“. In Particles On Surfaces, 289–310. CRC Press, 2020. http://dx.doi.org/10.1201/9781003067429-15.

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Menn, Naftaly, und Boris Chudnovsky. „FTR-Based Expert System for Power Generation Units“. In Frontiers in Artificial Intelligence and Applications. IOS Press, 2021. http://dx.doi.org/10.3233/faia210287.

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The present expert system addresses the well-known problem existing on each large size boiler of a power generation utility - cleaning of fouling deposition created on the furnace walls and surfaces of heat exchangers. Continuous cleaning, which is a must, especially on large size units operated on fossil fuels, is very cumbersome and time-consuming procedure, mostly performed manually by technical staff sometime assisted by intelligence systems based on neural network. The expert system for cleaning suggested in the present study offers a new approach when the inference engine of the system is oriented to optimization of heat transfer inside the furnace. The target of optimization is maximization of the overall cleanliness factor of the furnace. On-going calculation of local heat transfer in different zones of the furnace is performed in real time by FTR devices positioned in different locations on the furnace wall and measuring continuously the Fouling Thickness and Reflectivity (FTR), along with local temperature of the flame. The system algorithm defines at each measurement cycle the optimal position where the next cleaning should be done and the corresponding signals are transferred by the system electronic circuitry to the controllers of the cleaning measures (the group of soot blowers to be activated). During the last two years our expert system has been successfully implemented on four coil-firing boilers of 500–600 MW on two power stations in Israel.

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Konferenzberichte zum Thema "Technical cleanliness"

Meurer, Detlef, und Amela Mrak. „Inspection of Technical Cleanliness“. In International conference Fluid Power 2017. University of Maribor Press, 2017. http://dx.doi.org/10.18690/978-961-286-086-8.12.

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Elo, Lauri, Juuso Pekkonen und Jari Rinkinen. „Technical Cleanliness of Assembled Fluid Power Components“. In 8th FPNI Ph.D Symposium on Fluid Power. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpni2014-7850.

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The demands on the cleanliness of fluid power systems increase continuously. The KompuNW project, which was launched in 2011, aimed to find out the technical cleanliness of fluid power components in Finland, and the technical cleanliness was measured with commercial cleanliness cabinets. These cabinets apply well for hydraulic components where a rinsing pen should reach the test component surfaces that need to be controlled. In some cases the flow rate or the pressure produced by the cleanliness cabinets is insufficient for detaching particles from the surfaces of hollow components e.g. hydraulic cylinders or oil reservoirs. For this reason the functional test bench, designed and constructed in IHA, uses low viscosity hydraulic oil to extract contaminants from the assembled fluid power components. The extracted particles can then be analysed in the test bench with a microscope or an inline particle counter. This paper has several aims. First the backgrounds of fluid power components are described. Then this paper will present the differences in the definitions and codes of oil cleanliness (ISO 4406:1999, SAE AS4059E:2005) and component cleanliness (ISO 16232:2007). In addition, the differences between the test bench and the commercial cleanliness cabinets are presented. Standards ISO 16232:2007-5 and ISO 18413:2002 were applied in the design of the test bench. The main points of these standards are introduced in this paper, too. Finally the extraction procedures of a hydraulic cylinder and oil reservoir are shown with examples of the extraction curves of these components.

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Buchta, Dominic, Albrecht C. Brandenburg und Stefan Adolph. „A cheap, fast, and versatile illumination system for technical cleanliness“. In Unconventional Optical Imaging III, herausgegeben von Marc P. Georges, Gabriel Popescu und Nicolas Verrier. SPIE, 2022. http://dx.doi.org/10.1117/12.2624395.

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Lonsdale, Cameron, Steven Dedmon, Jay Galbraith und James Pilch. „Recent Research to Improve Wheel and Axle Composition, Properties and Designs“. In ASME 2007 Rail Transportation Division Fall Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/rtdf2007-46008.

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This paper describes research efforts by a North American railroad wheel and axle manufacturer to improve steel chemistry, cleanliness, and properties for improved component service performance. The authors describe extensive work to improve steel cleanliness in the melting process. Also they review attempts to correlate ultrasonic testing data with microcleanliness test results, and detail subsequent work to determine steel cleanliness using the Advanced Steel Cleanliness Assessment Technique (ASCAT), which is being developed by a university and a supplier. Emphasis is placed on determining the type, number and size of discontinuities within the steel. Additionally, efforts to improve mechanical properties of microalloyed axles are reviewed along with microstructural details relevant to the work. The role of vanadium, molybdenum, aluminum, and other elements, on axle structure and properties is discussed. A new axle design, with significantly larger body diameter, is described and finite element analysis (FEA) results for the design are presented.

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Anapagaddi, Ravikiran, Rishabh Shukla, Sharad Goyal, Amarendra K. Singh, Janet K. Allen, Jitesh H. Panchal und Farrokh Mistree. „Exploration of the Design Space in Continuous Casting Tundish“. In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34254.

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Due to the stringent requirements of industry, it has become extremely important to have a careful control over the required performance and properties of steels. Performance and properties of advanced high strength steel depend significantly on its cleanliness. Cleanliness is achieved by restricting the inclusion count to a permissible limit. Over the past few years, there has been increased use of tundish, a device that acts as a buffer between ladle and mold, for controlling inclusions. Apart from facilitating inclusion removal, tundish also maintains low dead volume and thermal and chemical homogeneity, which is required for smooth casting operation. Thus, performance of the tundish operation greatly influences the properties and quality of the cast slab. Tundish performance is generally assessed using parameters such as inclusion removal efficiency, dead volume within tundish and effectiveness in maintaining the desired amount of superheat. But, the aforesaid parameters are conflicting in nature. Managing the conflict and providing a satisficing solution based on the customer requirements become essential. In this paper, we present an approach to manage the conflicts involved in designing a tundish. An integrated framework, by linking meta-models with compromise Decision Support Problem (cDSP) construct, is developed to determine a satisficing solution considering conflicting requirements. The utility of the framework is illustrated by providing decision support when an existing configuration for tundish is unable to meet the requirements. This has been done by exploring the design space of tundish and coming up with a design and operating set points suitable for a particular purpose. This approach can be instantiated for other unit operations involved in steel manufacturing. In the future, each unit operation can be integrated to provide a complete picture of steel manufacturing which in turn will help in reducing the time and cost incurred in the development of new materials and products.

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Blizard, Norman C. „Future Diesel Fuel Requirements and Fuel Quality Impacts on Tier 2-4 High Horsepower Offroad Engines With Common Rail Fuel Systems“. In ASME 2014 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icef2014-5426.

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Off highway Tier 2-4 emissions requirements for high speed, high horsepower diesel engines (>750 h.p.) have driven substantial engine, after-treatment and fuel system design improvements. Modern high pressure common rail (HPCR) fuel systems are being applied by engine manufacturers through use of increased injection pressure, precision injection timing, and multiple injection events to achieve emissions targets. In the field, careful attention to diesel fuel quality is now required by the end user to avoid problems with performance, reliability and durability of the fuel systems and after-treatment. Ultra-fine filtration and complete water separation are essential to maintain the fuel clean and dry. Internal Diesel Injector Deposit (IDID) formation due to degradation of the fuel and unintended consequences of additives must also be avoided. This is a voice of a fuel consumer and fuel system integrator to fuel suppliers and end customers on challenges encountered and countermeasures developed to achieve better fuel filtration, water separation, fuel cleanliness practices and end user education.

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Friso, R., N. Casari, A. Suman, M. Pinelli und Francesco Montomoli. „A Design for Fouling Oriented Optimization of an HPT Nozzle“. In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91627.

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Abstract Fouling and erosion are two problems that severely affect gas turbines. The shape of the blade, its roughness, and its structural stability can vary as a consequence of these phenomena. The outcomes of this occurrence can span from the efficiency reduction to the engine shut down according to the nature of the material ingested, to the concentration of contaminants in the air, the cleanliness of fuel and to the particular design of the machine. In this work, an axial turbine airfoil is modified according to the requirement of less sensibility to the phenomena above mentioned, utilizing an automatic optimization algorithm. An artificial neural network surrogate approach is used for searching the optimal shape, minimizing the computational cost of the entire process. The optimum design of the blade is therefore achieved, in order to reduce the effects of deposition on the performance. The methodology here proposed is fully general and it is applied to an HPT nozzle in the present analysis.

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Shukla, Rishabh, Ravikiran Anapagaddi, Amarendra K. Singh, Jitesh H. Panchal, Janet K. Allen und Farrokh Mistree. „Exploring the Design Set Points of Refining Operation in Ladle for Cost Effective Desulfurization and Inclusion Removal“. In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46265.

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This paper is motivated by a need identified by steel makers, namely, the need to produce steel products with new and often more stringent set of specifications and enhanced performances (such as fatigue life and corrosion behavior) using existing equipment cost-effectively. Manufacturing a steel product involves series of unit operations, each having a significant bearing on the properties of the end product. This paper focuses on studying the effect of one such unit operation, namely, ladle refining. The performance like corrosion behavior and fatigue life and properties of advanced high strength steel are greatly influenced by its cleanliness and by maintaining composition within specified bounds. Cleanliness of steel is assessed in terms of the count and nature of inclusions present and the levels of tramp elements such as sulfur, phosphorus and total oxygen present in the liquid steel. The desired composition is maintained with respect to alloying elements (Ni, Cr, Mn, etc.) that are added to impart certain properties to the steel. The ladle furnace is one of the key unit operations for carrying out deoxidation and desulfurization to maintain the levels of oxygen and sulfur within a tolerable limit. Deoxidation reaction during refining lead to formation of a number of which are deleterious in nature and should be removed. The effectiveness of the ladle operation is thus influenced by conflicting goals such as inclusion removal efficiency, desulfurization and the cost of refining. George Box is reputed to have observed that all models are wrong and some are useful. In keeping with George Box’s observation we suggest that our challenge is to determine the set points for the ladle unit operation using computational models that at best capture the essence of reality but not reality itself. Therefore, the need is to find solutions that are relatively insensitive to the inherent uncertainties embodied in the computational model while satisficing the conflicting goals. In this paper we present a method for visualizing and exploring the solution space using the compromise Decision Support Problem (cDSP) as a decision model. We illustrate the efficacy of our method, for use by steel producers, by determining the set points for a ladle, in an industrial setting.

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Kim, Il Hwan, und Sang Chul Park. „Establishment of the Advanced Startup Turnover Process for New Nuclear Power Plants“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25245.

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This paper provides the management and technical issues of a successful turnover process from construction to the nuclear startup organization. The management issues include the development of effective organizations of construction completion group, turnover organization, enhancement of communication between the related groups, the systematic training programs for nurturing startup experts, and also the focused management of essential system turnover for each key event. The paper will also discuss other management issues required for successful systems turnover. Technical issues which will be addressed in this paper for successful turnovers will include the development of computerized Nuclear Power Construction Management System (NPCMS), three dimensional (3-D) CAD program, how to sub-scope the systems and partial turnover to expedite the system turnover, and the issues of maintaining the cleanliness of main control room and electrical equipment rooms.

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Jung, Sangjin, und Timothy W. Simpson. „Multidisciplinary Analysis and Product Family Optimization of Front-Loading Washing Machines“. In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59520.

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In the past decade, the market share of front-loading washing machines has seen explosive growth in the United States. As a result, many companies are now offering families of front-loading washing machines with a variety of features and options. Understanding the tradeoffs within these product families is challenging as existing research has focused primarily on a single disciplinary analysis (e.g., dynamic analysis, strength analysis); few models exist for cleanliness, reliability, energy efficiency, etc. In this paper, we introduce a new integrated multidisciplinary analysis using simulations, mathematical models, and response surface models based on the ratings of product attributes. In order to determine feasible design solutions for a front-loading washer family, we formulate a product family design problem using deviation functions and a product family penalty function. A multi-objective genetic algorithm is applied to solve the proposed formulation, and the results indicate that designers can successfully determine solutions for the best performance, most common, and compromise families of front-loading washers.

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Berichte der Organisationen zum Thema "Technical cleanliness"

Liera, Carla, Mónica García, Kim Andersson und Elisabeth Kvarnström. Combining sewered and non-sewered sanitation in Montero, Bolivia: scaling up sustainably. Stockholm Environment Institute, Februar 2022. http://dx.doi.org/10.51414/sei2022.007.

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The city of Montero, through the cooperative utility COSMOL, has successfully implemented on-site sanitation services for part of its population, in parallel to sewer-based services. However, additional solutions, capacity development and strengthening of governance systems are needed to allow for increased sustainability, for both the sewered and non-sewered sanitation services in the city. Technical improvements are still needed in wastewater and excreta management and treatment, to reduce health and environmental impacts. However, optimizing the existing sanitation systems could increase environmental, health and hygiene sustainability. Urine-diverting dry toilets (UDDTs) have the potential to reduce environmental impact the most, once optimized and if urine and faeces are collected and treated for reuse. Local farmers have expressed demand for sanitation reuse products, as long as low price and quality can be guaranteed. From a household perspective, demand exists for high levels of service and maintenance by providers, no matter the type of system, to ensure simple maintenance by users. But the sanitation system still needs to be affordable, match cleanliness expectations, and remain free of odours, mosquitos and rodents. Upscaling on-site sanitation systems depends strongly on the support of the public institutions and resources available, including legal, economic and technical resources, as well as having a long-term vision.

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