Reliability and Maintenance - An Overview of Cases最新文献

A Survivable and Reliable Network Topological Design Model 一种可生存可靠的网络拓扑设计模型

Reliability and Maintenance - An Overview of Cases Pub Date : 2020-07-01 DOI: 10.5772/INTECHOPEN.84842

F. Robledo, P. Romero, Pablo Sartor, Luis Stábile, Omar Viera

{"title":"A Survivable and Reliable Network Topological Design Model","authors":"F. Robledo, P. Romero, Pablo Sartor, Luis Stábile, Omar Viera","doi":"10.5772/INTECHOPEN.84842","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.84842","url":null,"abstract":"This work is focused on the resolution of a mixed model for the design of large-sized networks. An algorithm is introduced, whose initial outcomes are promising in terms of topological robustness regarding connectivity and reliability. The algorithm combines the network survivability and the network reliability approaches. The problem of the topological design has been modeled based on the generalized Steiner problem with node-connectivity constraints (GSPNC), which is NP-hard. The aim of this study is to heuristically solve the GSP-NC model by designing low-cost highly connected topologies and to measure the reliability of such solutions with respect to a certain prefixed lower threshold. This research introduces a greedy randomized algorithm for the construction of feasible solutions for the GSP-NC and a local search algorithm based on the variable neighborhood search (VNS) method, customized for the GSP-NC. In order to compute the built network reliabilities, this work adapts the recursive variance reduction (RVR) technique, as a simulation method since the exact evaluation of this measurement is also NP-hard. The experimental tests were performed over a wide set of testing cases, which contained heterogeneous topologies, including instances of more than 200 nodes. The computational results showed highly competitive execution times, achieving minimal local optimal solutions of good quality fulfilling the imposed survivability and reliability conditions.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116095248","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

Microgrid System Reliability 微电网系统可靠性

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-07-15 DOI: 10.5772/INTECHOPEN.86357

R. Ahshan

{"title":"Microgrid System Reliability","authors":"R. Ahshan","doi":"10.5772/INTECHOPEN.86357","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.86357","url":null,"abstract":"This chapter presents the reliability evaluation of a microgrid system considering the intermittency effect of renewable energy sources such as wind. One of the main objectives of constructing a microgrid system is to ensure reliable power supply to loads in the microgrid. Therefore, it is essential to evaluate the reliability of power generation of the microgrid under various uncertainties. This is due to the stochastically varying wind speed and change in microgrid operational modes which are the major factors to influence the generating capacity of the individual generating unit in the microgrid. Reliability models of various subsystems of a 3-MW wind generation system are developed. The impact of stochastically varying wind speed to generate power by the wind turbine system is accounted in developing sub-system reliability model. A microgrid system reliability (MSR) model is developed by integrating the reliability models of wind turbine systems using the system reliability concept. A Monte Carlo simulation technique is utilized to implement the developed reliability models of wind generation and microgrid systems in a Matlab environment. The investigation reveals that maximizing the use of wind generation systems and storage units increases the reliability of power generation of the proposed microgrid system in different operating modes.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133062135","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 Evaluation of Power Systems 电力系统可靠性评估

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-05-13 DOI: 10.5772/INTECHOPEN.85571

A. Al-Shaalan

{"title":"Reliability Evaluation of Power Systems","authors":"A. Al-Shaalan","doi":"10.5772/INTECHOPEN.85571","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.85571","url":null,"abstract":"Reliability evaluation of electric power systems is an essential and vital issue in the planning, designing, and operation of power systems. An electric power system consists of a set of components interconnected with each other in some purposeful and meaningful manner. The object of a reliability evaluation is to derive suitable measures, criteria, and indices of reliable and dependable performance based on component outage data and configuration. For evaluating generated reliability, the components of interest are the generating units and system configuration, which refer to the specific unit(s) operated to serve the present or future load. The indices used to measure the generated reliability are probabilistic estimates of the ability of a particular generation configuration to supply the load demand. These indices are better understood as an assessment of system-wide generation adequacy and not as absolute measures of system reliability. The indices are sensitive to basic factors like unit size and unit availability and are most useful when comparing the relative reliability of different generation configurations. The system is deemed to operate successfully if there is enough generation capacity (adequate reserve) to satisfy the peak load (maximum demand). Firstly, generation model and load model are convolved (mutually combined) to yield the risk of supply shortages in the system. Secondly, probabilistic estimates of shortage risk are used as indices of bulk power system reliability evaluation for the considered configuration.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132440303","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: 753

Maintenance and Asset Life Cycle for Reliability Systems 可靠性系统的维护和资产生命周期

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-05-13 DOI: 10.5772/INTECHOPEN.85845

C. Patiño-Rodríguez, F. Carazas

{"title":"Maintenance and Asset Life Cycle for Reliability Systems","authors":"C. Patiño-Rodríguez, F. Carazas","doi":"10.5772/INTECHOPEN.85845","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.85845","url":null,"abstract":"This chapter presents tools, methods, and indicators, in order to develop a successful and modern maintenance program. These are based on reliability engineering that improves the reliability of a system or complex equipment. Frequently, the industry implements maintenance schemes, which are based on equipment’s manufacturer’s recommendations and may not apply changes throughout the asset life cycle. In this sense, several philosophies, methodologies, and standards seek to assist this process, but most of them do not take into consideration their operation characteristics, production necessity, and other factors that are regarded as being important to one’s company. This method is based on the analysis of preventive component replacements and the subsequent critical consequences. These analy-ses may be used as a decision-making tool for defining component replacement decisions. In this chapter, the first section introduces and justifies the importance of this topic being approached from the perspective of asset management. Next, it discusses key maintenance concepts and techniques, with the aim of establishing the foundation of a maintenance management. The purpose of the final section is to present a maintenance strategy model, and it presents the findings of the case study about model implementation at home cleaning service company.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115747645","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: 2

Reliability Technology Based on Meta-Action for CNC Machine Tool 基于元作用的数控机床可靠性技术

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-04-22 DOI: 10.5772/INTECHOPEN.85163

Y. Ran, Wei Zhang, Zongyi Mu, Genbao Zhang

引用次数: 2

Reliability Analysis Based on Surrogate Modeling Methods 基于代理建模方法的可靠性分析

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-02-28 DOI: 10.5772/INTECHOPEN.84640

Qian Wang

{"title":"Reliability Analysis Based on Surrogate Modeling Methods","authors":"Qian Wang","doi":"10.5772/INTECHOPEN.84640","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.84640","url":null,"abstract":"Various surrogate modeling methods have been developed to generate approximate functions of expensive numerical simulations. They can be used in reliability analysis when integrated with a numerical reliability analysis method such as a first-order or second-order reliability analysis method (FORM/SORM), or Monte Carlo simulations (MCS). In this chapter, a few surrogate modeling methods are briefly reviewed. A reliability analysis approach using surrogate models based on radial basis functions (RBFs) and successive RBFs is presented. The RBF surrogate modeling method is a special type of interpolation method, as the model passes through all available sample points. Augmented RBFs are adopted to create approximate models of a limit state/performance function, before the failure probability can be computed using MCS. To improve model efficiency, a successive RBF (SRBF) surrogate modeling method is investigated. Several mathematical and practical engineering examples are solved. The failure probabilities computed using the SRBF surrogate modeling method are fairly accurate, when a reasonable sample size is used to create the surrogate models. The method based on augmented RBF surrogate models is useful for probabilistic analysis of practical problems, such as civil and mechanical engineering applications.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114367368","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

Treatment of Uncertainties in Probabilistic Risk Assessment 概率风险评估中不确定性的处理

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-01-16 DOI: 10.5772/INTECHOPEN.83541

V. D. Vasconcelos, W. A. Soares, Antônio Carlos Lopes da Costa, A. Raso

{"title":"Treatment of Uncertainties in Probabilistic Risk Assessment","authors":"V. D. Vasconcelos, W. A. Soares, Antônio Carlos Lopes da Costa, A. Raso","doi":"10.5772/INTECHOPEN.83541","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.83541","url":null,"abstract":"Probabilistic risk assessment (PRA), sometimes called probabilistic safety analysis, quantifies the risk of undesired events in industrial facilities. However, one of the weaknesses that undermines the credibility and usefulness of this technique is the uncertainty in PRA results. Fault tree analysis (FTA) and event tree analysis (ETA) are the most important PRA techniques for evaluating system reliabilities and likelihoods of accident scenarios. Uncertainties, as incompleteness and imprecision, are present in probabilities of undesired events and failure rate data. Fur-thermore, both FTA and ETA traditionally assume that events are independent, assumptions that are often unrealistic and introduce uncertainties in data and modeling when using FTA and ETA. This work explores uncertainty handling approaches for analyzing the fault trees and event trees (method of moments) as a way to overcome the challenges of PRA. Applications of the developed frameworks and approaches are explored in illustrative examples, where the probability distributions of the top event of fault trees are obtained through the propagation of uncertainties of the failure probabilities of basic events. The application of the method of moments to propagate uncertainty of log-normal distributions showed good agreement with results available in the literature using different methods.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132834009","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: 2

Advantages of Condition-Based Maintenance over Scheduled Maintenance Using Structural Health Monitoring System 使用结构健康监测系统进行状态维护优于定期维护

Reliability and Maintenance - An Overview of Cases Pub Date : 2019-01-11 DOI: 10.5772/INTECHOPEN.83614

Ting Dong, R. Haftka, N. Kim

{"title":"Advantages of Condition-Based Maintenance over Scheduled Maintenance Using Structural Health Monitoring System","authors":"Ting Dong, R. Haftka, N. Kim","doi":"10.5772/INTECHOPEN.83614","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.83614","url":null,"abstract":"This chapter quantifies the advantages of condition-based maintenance on the safety and lifetime cost of an airplane fuselage. The lifecycle of an airplane is modeled as blocks of crack propagation due to pressurization interspersed with inspection and maintenance. The Paris-Erdogan model with uncertain parameters is used to model fatigue crack growth. The fuselage skin is modeled as a hollow cylinder, and an average thickness is calculated to achieve a probability of failure in the order of 1 in 10 million with scheduled maintenance. Condition-based maintenance is found to improve the safety of an airplane over scheduled maintenance and will also lead to savings in lifecycle cost. The main factor of the savings stems from the reduced net revenue lost due to shortened downtime for maintenance. There are also other factors such as work saved on inspection and removing/installing surrounding structures for manual inspection. In addition to cost savings, some potential advantages of condition-based maintenance are discussed such as avoiding damage caused by removing/installing surrounding structures, more predictable maintenance, and improving the safety issues of same aircraft model by posting the frequently occurred damages into Airworthiness Directives, Service Bulletins, or Service Letters.","PeriodicalId":357808,"journal":{"name":"Reliability and Maintenance - An Overview of Cases","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128638504","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: 8