Dissertations / Theses on the topic 'Time-dependent reliability'
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Buijs, Foekje Akke. "Time-dependent reliability analysis of flood defences." Thesis, University of Newcastle Upon Tyne, 2008. http://hdl.handle.net/10443/888.
Full textKerpicci, Kara Sibel. "Reliability-based Analysis Of Time-dependent Scouring At Bridge Abutments." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610334/index.pdf.
Full textHussin, Razaidi. "A statistical study of time dependent reliability degradation of nanoscale MOSFET devices." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8052/.
Full textHilsmeier, Todd Andrew. "Characterization of time-dependent component reliability and availability effects due to aging /." The Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487950153601096.
Full textMorita, Lia Hanna Martins. "Degradation modeling for reliability analysis with time-dependent structure based on the inverse gaussian distribution." Universidade Federal de São Carlos, 2017. https://repositorio.ufscar.br/handle/ufscar/9120.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Conventional reliability analysis techniques are focused on the occurrence of failures over time. However, in certain situations where the occurrence of failures is tiny or almost null, the estimation of the quantities that describe the failure process is compromised. In this context the degradation models were developed, which have as experimental data not the failure, but some quality characteristic attached to it. Degradation analysis can provide information about the components lifetime distribution without actually observing failures. In this thesis we proposed different methodologies for degradation data based on the inverse Gaussian distribution. Initially, we introduced the inverse Gaussian deterioration rate model for degradation data and a study of its asymptotic properties with simulated data. We then proposed an inverse Gaussian process model with frailty as a feasible tool to explore the influence of unobserved covariates, and a comparative study with the traditional inverse Gaussian process based on simulated data was made. We also presented a mixture inverse Gaussian process model in burn-in tests, whose main interest is to determine the burn-in time and the optimal cutoff point that screen out the weak units from the normal ones in a production row, and a misspecification study was carried out with the Wiener and gamma processes. Finally, we considered a more flexible model with a set of cutoff points, wherein the misclassification probabilities are obtained by the exact method with the bivariate inverse Gaussian distribution or an approximate method based on copula theory. The application of the methodology was based on three real datasets in the literature: the degradation of LASER components, locomotive wheels and cracks in metals.
As técnicas convencionais de análise de confiabilidade são voltadas para a ocorrência de falhas ao longo do tempo. Contudo, em determinadas situações nas quais a ocorrência de falhas é pequena ou quase nula, a estimação das quantidades que descrevem os tempos de falha fica comprometida. Neste contexto foram desenvolvidos os modelos de degradação, que possuem como dado experimental não a falha, mas sim alguma característica mensurável a ela atrelada. A análise de degradação pode fornecer informações sobre a distribuição de vida dos componentes sem realmente observar falhas. Assim, nesta tese nós propusemos diferentes metodologias para dados de degradação baseados na distribuição gaussiana inversa. Inicialmente, nós introduzimos o modelo de taxa de deterioração gaussiana inversa para dados de degradação e um estudo de suas propriedades assintóticas com dados simulados. Em seguida, nós apresentamos um modelo de processo gaussiano inverso com fragilidade considerando que a fragilidade é uma boa ferramenta para explorar a influência de covariáveis não observadas, e um estudo comparativo com o processo gaussiano inverso usual baseado em dados simulados foi realizado. Também mostramos um modelo de mistura de processos gaussianos inversos em testes de burn-in, onde o principal interesse é determinar o tempo de burn-in e o ponto de corte ótimo para separar os itens bons dos itens ruins em uma linha de produção, e foi realizado um estudo de má especificação com os processos de Wiener e gamma. Por fim, nós consideramos um modelo mais flexível com um conjunto de pontos de corte, em que as probabilidades de má classificação são estimadas através do método exato com distribuição gaussiana inversa bivariada ou em um método aproximado baseado na teoria de cópulas. A aplicação da metodologia foi realizada com três conjuntos de dados reais de degradação de componentes de LASER, rodas de locomotivas e trincas em metais.
Baingo, Darek. "A Framework for Stochastic Finite Element Analysis of Reinforced Concrete Beams Affected by Reinforcement Corrosion." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23063.
Full textEmam, Emam. "UTILIZING A REAL LIFE DATA WAREHOUSE TO DEVELOP FREEWAY TRAVEL TIME ELIABILITY STOCHASTIC MODELS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3987.
Full textPh.D.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering
Cheng, Danling. "Integrated System Model Reliability Evaluation and Prediction for Electrical Power Systems: Graph Trace Analysis Based Solutions." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28944.
Full textPh. D.
Miller, Ian Timothy. "Probabilistic finite element modeling of aerospace engine components incorporating time-dependent inelastic properties for ceramic matrix composite (CMC) materials." Akron, OH : University of Akron, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1144941702.
Full text"May, 2006." Title from electronic thesis title page (viewed 11/29/2007) Advisor, Vinod Arya; Co-Advisor, Ali Hajjafar; Faculty reader, Shantaram S. Pai; Department Chair, Kevin Kreider; Dean of the College, Ronald F. Levant; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
Zhu, Weiqi, and ycqq929@gmail com. "An Investigation into Reliability Based Methods to Include Risk of Failure in Life Cycle Cost Analysis of Reinforced Concrete Bridge Rehabilitation." RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080822.140447.
Full textDeng, Yingjun. "Degradation modeling based on a time-dependent Ornstein-Uhlenbeck process and prognosis of system failures." Thesis, Troyes, 2015. http://www.theses.fr/2015TROY0004/document.
Full textThis thesis is dedicated to describe, predict and prevent system failures. It consists of four issues: i) stochastic degradation modeling, ii) prognosis of system failures, iii) failure level estimation and iv) maintenance optimization. The time-dependent Ornstein-Uhlenbeck (OU) process is introduced for degradation modeling. The time-dependent OU process is interesting from its statistical properties on controllable mean, variance and correlation. Based on such a process, the first passage time is considered as the system failure time to a pre-set failure level. Different methods are then proposed for the prognosis of system failures, which can be classified into three categories: analytical approximations, numerical algorithms and Monte-Carlo simulation methods. Moreover, the failure level is estimated from the lifetime distribution by solving inverse first passage problems. This is to make up the potential gap between failure and degradation records to reinforce the prognosis process via first passage problems. From the prognosis of system failures, the maintenance optimization for a continuously monitored system is performed. By introducing first passage problems, the arrangement of preventive maintenance is simplified. The maintenance decision rule is based on a virtual failure level, which is solution of an optimization problem for proposed objective functions
Chen, Chang-Chih. "System-level modeling and reliability analysis of microprocessor systems." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53033.
Full textAhmadivala, Morteza. "Vers une planification optimale de la maintenance des structures existantes sur la base d'une analyse de fiabilité en fonction du temps." Thesis, Université Clermont Auvergne (2017-2020), 2020. http://theses.bu.uca.fr/nondiff/2020CLFAC056_AHMADIVALA.pdf.
Full textCivil engineering structures play an important role in any country for improving the economy together with the social and environmental welfare. An unwanted failure might cause significant impacts at different levels for the structure owner and for users. Fatigue is one of the main degradation processes on steel structures that causes structural failure before the end of the designed service life. To avoid unexpected failures due to fatigue, a comprehensive structural Life Cycle Management (LCM) is required to minimize the life-cycle cost and maximize the structural service life. One of the main objectives within the LCM can be related to optimizing the structural maintenance planning. Achieving this goal is a challenging task which requires to address some challenges such as predicting the structural performance under uncertainty, employing Structural Health Monitoring (SHM) data to reduce uncertainties, taking into account crack propagation behavior for given components, reliability and cost-informed decision making, and effect of maintenance actions among others. Accordingly, following contributions are considered in this research to improve the capabilities of structural LCM which are explained shortly in the sequel.Developing a new time-dependent reliability method for fatigue reliability analysis.Investigating the effectiveness of advanced crack propagation tools to study unwanted fatigue cracking problems and characterizing some possible repair actions on a real case study.Introducing the assumptions and simplification steps required to integrate the proposed time-dependent reliability method with crack propagation models to approximate the time-dependent fatigue reliability.As the first contribution of this thesis, a new time-dependent reliability method called AK-SYS-t is proposed. This method provides an efficient and accurate tool to evaluate time-dependent reliability of a component compared to other available methods. AK-SYS-t relates the time-dependent reliability to system reliability problems and tries to exploit the efficient system reliability methods such as AK-SYS towards time-dependent reliability analysis. It is worth mentioning that time-dependent reliability analysis is necessary in this context since the performance deterioration (such as fatigue) is a time-dependent process associated with time-dependent parameters such as fatigue loading.Another related topic is the study of crack propagation phenomenon with advanced modeling tools such as Finite Element Method (FEM) and eXtended Finite Element Method (XFEM). For illustration purposes, the crack in the root of a fillet weld is considered (common fatigue detail in bridges with orthotropic deck plates). One important issue investigated herein is the influence of the transversal tension in the deck plate on the direction of the crack propagation. It is shown how increasing the transversal tension in the deck plate may change the crack propagation towards the deck plate. Such cracks are considered dangerous since they are hard to inspect and detect. In the end, XFEM is used to investigate the effectiveness of two possible repair solutions.A supplementary contribution is related to introducing the required steps in order to integrate the newly developed time-depend reliability method with crack propagation problems through some applicational examples. This is a challenging task since performing the time-dependent reliability analysis for such problems requires a cycle-by-cycle calculation of stress intensity factors which requires huge computational resources. Therefore, the aim here is to introduce the assumptions and simplification steps in order to adopt the AK-SYS-t for fatigue reliability analysis. Accordingly, two examples are considered. (...)
Liang, Bin. "Estimation of Time-dependent Reliability of Suspension Bridge Cables." Thesis, 2016. https://doi.org/10.7916/D8V69JTN.
Full textChang, Shih-Cheng, and 張仕政. "Cooperative particle swarm optimization for the time-dependent reliability redundancy allocation problems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/2f7am9.
Full textSudarsanam, Nandan. "Methods of estimating stress-strength interference reliability under a time dependent degradation analysis." 2005. http://digital.library.okstate.edu/etd/umi-okstate-1356.pdf.
Full textLiu, Jen-Chieh, and 劉仁傑. "Study of RRAM reliability and switching mechanism using time-dependent dielectric breakdown methods." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/86962169833683697359.
Full text國立交通大學
電子工程學系 電子研究所
102
In this thesis, time-dependent dielectric breakdown (TDDB) characteristics of resistive switching random access memory (RRAM) have been thoroughly studied. Several applications have also been demonstrated, such as long-term reliability prediction and understanding on the resistive-switching (RS) mechanism. In the gate dielectric breakdown theory, there are well-established methodologies for lifetime prediction. These methodologies were introduced in this work to study RRAM read disturb immunity. Furthermore, fast TDDB lifetime projection of the high-resistance state (HRS) was performed by ramp-voltage test and verified by the constant voltage TDDB test. Apart from the advantages such as convenience and accuracy, the ramp-voltage-based method was also available in different RRAM cells, indicating its promising potential to become a general methodology to predict read disturb immunity. Additionally, it is also presented that TDDB of HRS is able to provide additional insight into the resistive switching mechanisms. In the same RRAM cell, two RS modes are obtained using different operation schemes. The two RS modes show distinctive electrical and statistical properties. Furthermore, their time-to-SET (tSET) distribution reveals different reliability concerns. Therefore, a comprehensive measurement methodology involving TDDB of the SET process and electrical characteristics of HRS is developed to clarify the origin of the two RS modes, which can be well explained by different locations where RS took place; in bulk high- or interfacial layer (IL) adjacent to silicon substrate. Moreover, changing the operation conditions led to a gradual evolution of the RS location.