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International Journal of Reliability and Safety最新文献

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Stochastic analysis of a three-unit non-identical repairable system with priority to main unit for operation and repair 具有主机组优先运行和维修权的三机组非相同可修系统的随机分析
International Journal of Reliability and Safety Pub Date : 2020-01-01 DOI: 10.1504/IJRS.2020.10035805
N. Gitanjali, S. Kadyan, S. Malik
{"title":"Stochastic analysis of a three-unit non-identical repairable system with priority to main unit for operation and repair","authors":"N. Gitanjali, S. Kadyan, S. Malik","doi":"10.1504/IJRS.2020.10035805","DOIUrl":"https://doi.org/10.1504/IJRS.2020.10035805","url":null,"abstract":"Here, stochastic analysis of a three-unit repairable system is carried out with one main unit (class I unit) and two cold standby identical secondary units (class II units). The secondary units are less efficient than the main unit and neither can bear the load of the main unit. However, the secondary units can work simultaneously at the failure of the main unit. The priority is given to the class I unit for operation and repair. Repair activities are handled by a single server and assumed to be perfect. Failures of class I unit and class II units are different but constant. The repair distributions of both types of units are taken as general. The expressions for reliability measures and profit function are derived using Semi-Markov Process (SMP) and regenerative point technique. The application of the proposed model can be visualised in a power supply system.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66709640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Time-varying reliability analysis method for micropolar fluid elastohydrodynamic lubrication 微极流体弹流动力润滑时变可靠性分析方法
International Journal of Reliability and Safety Pub Date : 2020-01-01 DOI: 10.1504/IJRS.2020.10035799
M. Dai, Y. Tao
{"title":"Time-varying reliability analysis method for micropolar fluid elastohydrodynamic lubrication","authors":"M. Dai, Y. Tao","doi":"10.1504/IJRS.2020.10035799","DOIUrl":"https://doi.org/10.1504/IJRS.2020.10035799","url":null,"abstract":"Reliable lubrication of a bearing means that the roller and bearing are separated by the oil film, resulting in less wear and longer life. During the bearing lubrication process, some particles are produced due to wear and other reasons. Generally, the particle size in the micropolar fluid gradually increases with time. Moreover, velocity and load of the bearing are uncertain. It is very important to consider the time-varying reliability of bearing lubrication. In this paper, a time-varying reliability analysis method for micropolar fluid elastohydrodynamic lubrication is proposed based on response surface method and first passage method. The response surface method is applied to construct the response function of minimum oil film thickness, and the reliability model of lubrication is developed by the film thickness ratio. Then, the reliability of lubrication is calculated by first passage method. The numerical results show that both the accuracy and efficiency of the proposed method are high.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66709479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimisation design for wind turbine mainshaft bearing based on lubrication reliability 基于润滑可靠性的风电主轴轴承优化设计
International Journal of Reliability and Safety Pub Date : 2020-01-01 DOI: 10.1504/IJRS.2020.10037445
Liang Cao, S. Gong, Y. Tao
{"title":"Optimisation design for wind turbine mainshaft bearing based on lubrication reliability","authors":"Liang Cao, S. Gong, Y. Tao","doi":"10.1504/IJRS.2020.10037445","DOIUrl":"https://doi.org/10.1504/IJRS.2020.10037445","url":null,"abstract":"The lubrication of the mainshaft bearing has a great influence on the safe operation of wind turbines. In this paper, an optimal design model of the mainshaft bearing of a wind turbine is established on the lubrication reliability analysis. The maximum rated dynamic load is set as the design objective. The roller number, roller diameter, roller length and wall thicknesses are design parameters. Constraints are formulated mainly based on lubrication reliability and structure consideration. In the lubrication reliability constraint model, the lubrication reliability criterion was determined by solving the minimum film thickness of numerical calculation model of grease EHL. The reliability of bearing lubrication is calculated by Monte Carlo Simulation, and uncertain variables based on sensitivity analysis are selected to improve calculation precision. In the structure constraints, range for the design variables is determined in terms of requirements of geometric structure and strength. Finally, the mainshaft bearing was optimised and analysed by genetic algorithms. The analysis results show that the rated dynamic load of bearing is improved from 1.3e6 N to 2e6 N. Meanwhile the lubrication reliability is improved about 10%. The model presented shows great advantages and practical usefulness in the mainshaft bearing research of wind turbines.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66709728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probabilistic evaluation and design aspects for reliability enhancement of induction motor 提高感应电动机可靠性的概率评估和设计
International Journal of Reliability and Safety Pub Date : 2019-09-27 DOI: 10.1504/ijrs.2019.10024306
D. N. Vishwakarma, L. Varshney, R. K. Saket, O. Bharti, Sachin Kumar, Sanjay Kumar, K.S. Anand Kumar
{"title":"Probabilistic evaluation and design aspects for reliability enhancement of induction motor","authors":"D. N. Vishwakarma, L. Varshney, R. K. Saket, O. Bharti, Sachin Kumar, Sanjay Kumar, K.S. Anand Kumar","doi":"10.1504/ijrs.2019.10024306","DOIUrl":"https://doi.org/10.1504/ijrs.2019.10024306","url":null,"abstract":"This paper presents the probabilistic evaluation, design aspects and scientific suggestions to improve the reliability and performance of an industrial induction motor. The induction motors have experienced a long life and a high efficiency in service with appropriate design and quality control. However, reliability quantification and adequacy evaluation are still necessary and important for customer satisfaction, design improvement, marketing, vendor selection, production plan, service life determination, and scheduled maintenance. The industrial data related to manufacturing and failure of induction motors are analysed for reliability assessment and design suggestions. The reliability indices like Mean Time Between Failure (MTBF) and failure rate of induction motors are evaluated using industrial data-based exponential probabilistic distribution function, which is issued to plan the maintenance schedule of the industrial induction motors. The technological suggestions are finally presented in this paper to reduce the failure rate and enhance the MTBF for reliability improvement of induction motors.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45876566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Reliability assessment and performance analysis of DFIG-based WT for wind energy conversion system 基于dfig的风电转换系统WT可靠性评估与性能分析
International Journal of Reliability and Safety Pub Date : 2019-09-27 DOI: 10.1504/ijrs.2019.10024305
O. Bharti, R. K. Saket, S. K. Nagar
{"title":"Reliability assessment and performance analysis of DFIG-based WT for wind energy conversion system","authors":"O. Bharti, R. K. Saket, S. K. Nagar","doi":"10.1504/ijrs.2019.10024305","DOIUrl":"https://doi.org/10.1504/ijrs.2019.10024305","url":null,"abstract":"This paper presents the reliability assessment and performance analysis of Doubly Fed Induction Generator-based Wind Turbine (WT) for accurate DFIG-based WT modelling. This model calculates and describes the reliability of each unit and component of the WECs by using Markov process. To analyse the DFIG-based WT during transient and steady-state operations, both the control and modelling of the system have been illustrated in detail. The main contributions of this paper are the reliability assessment of the DFIG based WT units in terms of failures as well as repair rate and performance analysis in normal as well as faulted conditions. For fault analysis of the WECs, DFIG-based WT has been simulated in MATLAB Simulink for line to line, line to ground and double line to ground fault studies.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43578778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On the mixture of flexible Weibull extension and Burr XII distributions 柔性Weibull扩展与Burr XII分布的混合
International Journal of Reliability and Safety Pub Date : 2019-09-27 DOI: 10.1504/ijrs.2019.10024310
R. Kamal, M. Ismail
{"title":"On the mixture of flexible Weibull extension and Burr XII distributions","authors":"R. Kamal, M. Ismail","doi":"10.1504/ijrs.2019.10024310","DOIUrl":"https://doi.org/10.1504/ijrs.2019.10024310","url":null,"abstract":"This paper is devoted to study a new mixture model. This newly suggested model is a mixture of flexible Weibull extension and Burr XII distributions. We study the characteristics of the proposed distribution that includes probability density function, cumulative distribution function, reliability function and ageing behaviour through the failure rate function. Some statistical properties of the proposed distribution such as quantile function, the mode, median, r-th moments, the moment generating function and the order statistics are discussed. Moreover, the method of maximum likelihood is proposed for estimating the model parameters and also the Fisher's information matrix is derived. Finally, the performance of the proposed distribution is compared with existing distributions using applications of two real data sets to show the flexibility and efficiency of the new model.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41491789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Parametric selection of software reliability growth models using multi-criteria decision-making approach 基于多准则决策方法的软件可靠性增长模型参数选择
International Journal of Reliability and Safety Pub Date : 2019-09-27 DOI: 10.1504/ijrs.2019.10024309
R. Garg
{"title":"Parametric selection of software reliability growth models using multi-criteria decision-making approach","authors":"R. Garg","doi":"10.1504/ijrs.2019.10024309","DOIUrl":"https://doi.org/10.1504/ijrs.2019.10024309","url":null,"abstract":"The present research aims at the development of a computation procedure based on the mathematical procedures to solve the problem of Software Reliability Growth Model's (SRGMs) selection problem. The present selection problem is set as a Multi-Criteria Decision Making (MCDM) problem in this study and an MCDM approach, namely VIseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) is implemented to solve the same. To demonstrate the working of the VIKOR, two real-time failure data sets have been used on which 16 SRGMs are evaluated against a set of 12 selection indexes. The present study produces a comprehensive ranking of the various SRGMs based on their relative proximity as the result. The model having the smallest proximity value is graded at position-1 and the model with largest proximity value at the last position.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48927400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
A fuzzy-based failure mode effect and criticality analysis of solar photovoltaic systems 基于模糊的太阳能光伏系统失效模式效应及临界分析
International Journal of Reliability and Safety Pub Date : 2019-04-30 DOI: 10.1504/IJRS.2019.10020941
Sana Perveen, H. Ashfaq, M. Asjad
{"title":"A fuzzy-based failure mode effect and criticality analysis of solar photovoltaic systems","authors":"Sana Perveen, H. Ashfaq, M. Asjad","doi":"10.1504/IJRS.2019.10020941","DOIUrl":"https://doi.org/10.1504/IJRS.2019.10020941","url":null,"abstract":"In this research work, a Failure Mode and Effect Analysis (FMEA) has been applied to a Solar Photovoltaic (SPV) system that consists of a photovoltaic module, an inverter, connecting cable, battery and a charge controller. The FMEA is a tool that can gauge the possible failure mode(s) in order to determine the probability of the failure. The traditional (crisp) method of FMEA ranks all failure modes using Risk Priority Number (RPN) according to severity order. However, traditional FMEA has several disadvantages (like chance of error, human intelligence, etc.) which may be overcome by integrating them with artificial intelligence techniques. Therefore, fuzzy logic is implemented to assess and ranks associated with each failure mode of different subassemblies of SPV system. Ranking of all failure modes has been done on the basis of fuzzy RPN, which is calculated by weighted Euclidean distance formula and centroid defuzzification method. It is expected that this work will help the designers and engineers by making them aware of the qualitative analysis of SPV systems.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42803352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A TSST of the reliability function for exponential failure model using type II censored data with minimum cost of experimentations 用最小实验代价用II型截尾数据求指数失效模型可靠性函数的TSST
International Journal of Reliability and Safety Pub Date : 2019-04-30 DOI: 10.1504/IJRS.2019.10020942
Z. Al-Hemyari, Alla K. Jiheel
{"title":"A TSST of the reliability function for exponential failure model using type II censored data with minimum cost of experimentations","authors":"Z. Al-Hemyari, Alla K. Jiheel","doi":"10.1504/IJRS.2019.10020942","DOIUrl":"https://doi.org/10.1504/IJRS.2019.10020942","url":null,"abstract":"This paper considers a class of an efficient 'two-stage shrinkage testimator' (TSST) of 'reliability function' of 'exponential distribution', and the class uses additional information which can be obtained from the past practices, and in the form of past initial estimates (λ0) about the unknown parameter λ. The TSST is dependent upon a convenient shrinking factor, conventional estimators, the 'right censored plan' of sj 'ordered observations' of a variable sample of 'size' Sj and by developing five 'testing regions' for screening the 'closeness' of λ0 to λ by different 'criteria'. The computations of 'bias', 'mean squared error', 'expected sample size' and 'relative efficiency' show that the behaviour of the class of 'TSST' is almost similar to existing testimators and better than classical and similar estimators in several properties, for different constants and variables involved in it. Throughout the paper an application to a 'life time' problem is provided to illustrate applicability of the 'TSST' and expressions that are obtained from it. The behaviour of the developed 'TSST' and the significant comparative results offer some useful and sufficient insights for researchers to continue in the 'TSST' direction, and give adequate reasons for experimenters/practitioners to use 'TSST' in their applications.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43956068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
An optimal rejuvenation scheme for improving VoIP service reliability in the existence of resource exhaustion and security breaches 在存在资源耗尽和安全漏洞的情况下，提高VoIP业务可靠性的最佳年轻化方案
International Journal of Reliability and Safety Pub Date : 2019-04-30 DOI: 10.1504/IJRS.2019.10020939
Rahul Kumar, Vandana Gupta
{"title":"An optimal rejuvenation scheme for improving VoIP service reliability in the existence of resource exhaustion and security breaches","authors":"Rahul Kumar, Vandana Gupta","doi":"10.1504/IJRS.2019.10020939","DOIUrl":"https://doi.org/10.1504/IJRS.2019.10020939","url":null,"abstract":"The escalating number of end-users of VoIP and the challenges faced in furnishing first-class quality of service (QoS) are the major driving forces for research in the area of VoIP. When the resources allotted to every end-user get exhausted, it leads to a decline in the QoS. Further, as VoIP is an application operating on the internet, it is prone to security breaches. This paper addresses the issues of resource exhaustion and security breaches in a VoIP network. To help avert performance degradation in a VoIP system, software rejuvenation is also performed. The performance of a VoIP system in the existence of resource exhaustion and security breaches is modelled by means of a continuous time Markov chain (CTMC) to study the system reliability. From the CTMC the mean time to failure (MTTF) is obtained. Furthermore, an optimal rejuvenation scheme is proposed for achieving the best attainable value of MTTF.","PeriodicalId":39031,"journal":{"name":"International Journal of Reliability and Safety","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44678019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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