Template-Type: ReDIF-Article 1.0 Author-Name: Jinlong Wang Author-X-Name-First: Jinlong Author-X-Name-Last: Wang Author-Name: Junlong Chen Author-X-Name-First: Junlong Author-X-Name-Last: Chen Title: Topology optimisation design of mechanical tee backsheet Abstract: A finite element model of ASTM 114.3 mechanical tee backsheet is established by using the finite element software ANSYS. The stress distribution of backsheet under pretension force load is obtained through the strength analysis, and based on it, a topology optimisation calculations of backsheet is analysed. According to the topology optimisation results, the backsheet structure is redesigned and the finite element analysis to it shows that reducing the volume of the model of the backsheet while improving its stress distribution, the maximum equivalent stress is reduced and the enhanced chip reliability. Journal: Int. J. of Reliability and Safety Pages: 5-17 Issue: 1/2 Volume: 13 Year: 2019 Keywords: mechanical tee backsheet; finite element analysis; topology optimisation; optimal design. File-URL: http://www.inderscience.com/link.php?id=97010 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:5-17 Template-Type: ReDIF-Article 1.0 Author-Name: M.I.M. Ahmad Author-X-Name-First: M.I.M. Author-X-Name-Last: Ahmad Author-Name: A. Arifin Author-X-Name-First: A. Author-X-Name-Last: Arifin Author-Name: S. Abdullah Author-X-Name-First: S. Author-X-Name-Last: Abdullah Author-Name: W.Z.W. Jusoh Author-X-Name-First: W.Z.W. Author-X-Name-Last: Jusoh Author-Name: S.S.K. Singh Author-X-Name-First: S.S.K. Author-X-Name-Last: Singh Title: The probabilistic analysis of fatigue crack effect based on magnetic flux leakage Abstract: In this paper, probabilistic analysis on the fatigue crack effect was investigated by applying the Metal Magnetic Memory (MMM) method, based on Self-Magnetic Leakage Field (SMLF) signals on the surface of metal components. The precision of MMM signals is essential in identifying the validity of the proposed method. The tension-tension fatigue test was conducted using the testing frequency of 10 Hz with 4 kN loaded, and the MMM signals were captured using the MMM instrument. As a result, a linear relationship was observed between the magnetic flux leakage and cyclic loading parameter, presenting the R-squared value at 0.72-0.97. The 2P-Weibull distribution function was used as a probabilistic approach to identify the precision of the data analysis from the predicted, and experimental fatigue lives, thereby showing that all points are placed within the range of a factor of 2. Additionally, the characteristics of PDF, CDF, failure rate and failure probability data analysis were plotted and described. Therefore, a 2P-Weibull probability distribution approach is determined to be an appropriate method to determine the accuracy of data analysis for MMM signals in a fatigue test for metal components. Journal: Int. J. of Reliability and Safety Pages: 18-30 Issue: 1/2 Volume: 13 Year: 2019 Keywords: metal magnetic memory signals; probabilistic; fatigue lives; Weibull distribution. File-URL: http://www.inderscience.com/link.php?id=97011 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:18-30 Template-Type: ReDIF-Article 1.0 Author-Name: Hongjun Li Author-X-Name-First: Hongjun Author-X-Name-Last: Li Author-Name: Peng Yang Author-X-Name-First: Peng Author-X-Name-Last: Yang Author-Name: Xun Huang Author-X-Name-First: Xun Author-X-Name-Last: Huang Author-Name: Hui Yang Author-X-Name-First: Hui Author-X-Name-Last: Yang Title: Reliability assessment of pressure vessel design methods Abstract: Several pressure vessel design methods based on elastic analysis and elastic-plastic analysis are available to designers. This paper proposes a reliability analysis method to assess three pressure vessel design methods: Stress Categorisation Method (SCM), Limit-Load Analysis (LIMIT) in ASME code and DBA-L method which was recently proposed by present authors. It was concluded that with the same input variables into the three analyses, the responses of calculated results of three method were different, which provided an effective guidance to assess and choose the proper design method in engineering practice. Journal: Int. J. of Reliability and Safety Pages: 31-43 Issue: 1/2 Volume: 13 Year: 2019 Keywords: pressure vessel; reliability; SCM; stress categorisation method; LIMIT; limit-load analysis method. File-URL: http://www.inderscience.com/link.php?id=97014 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:31-43 Template-Type: ReDIF-Article 1.0 Author-Name: Qin He Author-X-Name-First: Qin Author-X-Name-Last: He Author-Name: Ruijun Zhang Author-X-Name-First: Ruijun Author-X-Name-Last: Zhang Author-Name: Tianyu Liu Author-X-Name-First: Tianyu Author-X-Name-Last: Liu Author-Name: Yabing Zha Author-X-Name-First: Yabing Author-X-Name-Last: Zha Author-Name: Jie Liu Author-X-Name-First: Jie Author-X-Name-Last: Liu Title: Multi-state system reliability analysis methods based on Bayesian networks merging dynamic and fuzzy fault information Abstract: Traditional Bayesian Networks (BNs) have limited abilities to analyse system reliability with fuzzy and dynamic information. To deal with such information in system reliability analysis, a new multi-state system reliability analysis method based on BNs was proposed. The proposed method effectively solved the deficiencies of existing reliability analysis methods based on BNs incorporating fuzziness and fault information. In this work, fuzzy set theory and changing failure probability function of components were introduced into BNs, and the dynamic fuzzy subset was introduced. The curve of the fuzzy dynamic fault probability of the leaf node fault state and fuzzy dynamic importance were developed and calculated. Finally, a case study of a truck system was employed to demonstrate the performance of the proposed methods in comparison with traditional fault tree and T-S fuzzy importance analysis methods. The proposed method proved to be feasible in capturing the fuzzy and dynamic information in real-world systems. Journal: Int. J. of Reliability and Safety Pages: 44-60 Issue: 1/2 Volume: 13 Year: 2019 Keywords: fuzzy subsets; fuzziness; Bayesian network; travel system of a truck. File-URL: http://www.inderscience.com/link.php?id=97016 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:44-60 Template-Type: ReDIF-Article 1.0 Author-Name: Antony Gratas Varuvel Author-X-Name-First: Antony Gratas Author-X-Name-Last: Varuvel Author-Name: Pratibha Xavier Pruno Author-X-Name-First: Pratibha Xavier Author-X-Name-Last: Pruno Title: Reliability allocation technique for complex system of systems Abstract: Reliability allocation is one of the important tasks during the design phase, which is to be executed as a part of DfR practices. Appropriate methodology is chosen based on the data available and the factors of influence required to be considered. Among those, the widely adopted AGREE method fails to meet the target reliability, when any of the importance indexes is less than unity. In addition, the assumption of exponential pdf is valid only to depict failures arising out of randomness. This paper aims to eliminate the shortcomings. Verification of the model under various boundary conditions has been carried out with the available data in the aerospace domain. Results obtained are found to be achieving the target goal set for the platform, which is a complex SoS. Journal: Int. J. of Reliability and Safety Pages: 61-82 Issue: 1/2 Volume: 13 Year: 2019 Keywords: AGREE; advisory group on reliability of electronics equipment; allocation; failure rate; fighter aircraft; maintainability; MTBF; mean time between failure; MTTF; mean time to failure; reliability. File-URL: http://www.inderscience.com/link.php?id=97017 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:61-82 Template-Type: ReDIF-Article 1.0 Author-Name: Dimpal Tomar Author-X-Name-First: Dimpal Author-X-Name-Last: Tomar Author-Name: Pradeep Tomar Author-X-Name-First: Pradeep Author-X-Name-Last: Tomar Title: New component-based reliability model to predict the reliability of component-based software Abstract: Component-Based Software (CBS) technology has potential impact on the evolution of software development. One of the dominant questions while designing CBS is to preserve its quality in which reliability plays a crucial part. Therefore prognosis of reliability of Component-Based Software System (CBSS) is difficult because mostly components are of black type so the prediction of the emergent properties like reliability is particularly quite difficult. In this paper, we propose a reliability estimation model noted as Component-Based Reliability Model (CBRM) to assess the reliability of individual components and after integration of components, i.e. based on two factors: <i>component reliability (CR) and average number of interaction failures.</i> Journal: Int. J. of Reliability and Safety Pages: 83-95 Issue: 1/2 Volume: 13 Year: 2019 Keywords: CBRM; component-based software reliability; CBSS; component-based software system; interaction ratio; individual component reliability; interaction failure; component interaction graph. File-URL: http://www.inderscience.com/link.php?id=97018 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:83-95 Template-Type: ReDIF-Article 1.0 Author-Name: Ashutosh Sharma Author-X-Name-First: Ashutosh Author-X-Name-Last: Sharma Author-Name: Rajiv Kumar Author-X-Name-First: Rajiv Author-X-Name-Last: Kumar Title: Risk-energy aware service level agreement assessment for computing quickest path in computer networks Abstract: In this paper, a new variant of the Quickest Path Problem (QPP) is addressed with additional factors of risk and energy which leads to the evaluation of Risk-Energy Constrained Quickest Path Problem (REQPP) computation. In REQPP, risk is based on lag-time or delay and energy necessary for the transmission between two adjacent nodes. The formulation of this problem presents a realistic path computation for critical applications. The success of REQPP is measured by defining a Service Level Agreement (SLA). The proposed algorithm is able to solve the risk-energy constrained REQPP for the continuity of communication. SLA fulfills the needs of multi-constrained path whereas its time-complexity is of the order of Dijkstra's algorithm. Finally, in the end, variation of penalty time and risk variation helps to find the high-performance value of the allowed delay time toward success of SLA. Journal: Int. J. of Reliability and Safety Pages: 96-124 Issue: 1/2 Volume: 13 Year: 2019 Keywords: green communications; risk-energy constraints; QPP; quickest path problem; SLA; requested service level agreements. File-URL: http://www.inderscience.com/link.php?id=97019 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:96-124 Template-Type: ReDIF-Article 1.0 Author-Name: Nitin Rohatgi Author-X-Name-First: Nitin Author-X-Name-Last: Rohatgi Author-Name: Krutarth Mehta Author-X-Name-First: Krutarth Author-X-Name-Last: Mehta Author-Name: Parijat Sarkar Author-X-Name-First: Parijat Author-X-Name-Last: Sarkar Author-Name: T. Christo Michael Author-X-Name-First: T. Christo Author-X-Name-Last: Michael Title: Emergency braking mechanism for an elevator using hydraulic and pneumatic actuation Abstract: The proposed idea aims at replacing the current safety mechanisms used by the elevators (i.e., governors) which are rope-based safety mechanism to rope independent, actuated by pneumatic and hydraulic cylinders. The proposed safety mechanism is lightweight and mounted on the top of the elevator. The mechanism involves a pneumatic cylinder actuating a hydraulic master cylinder using a class 1 lever for mechanical advantage. The hydraulic cylinder will pressurise the brake fluid and supply it to the callipers mounted on the elevator body. Callipers will cling to the guide rails upon actuation, thus stopping the elevator in very short distance. The effective force to be stopped by the callipers was calculated and parts were designed accordingly. Analyses of parts are done by considering maximum forces acting on hydraulic calliper mount and lever arm for varying thickness. Through calculations and analyses, the proposed system was found to be safe and reliable. Journal: Int. J. of Reliability and Safety Pages: 125-137 Issue: 1/2 Volume: 13 Year: 2019 Keywords: safety mechanism; elevator; pneumatic cylinder; hydraulic master cylinder; class 1 lever; guide rail; hydraulic calliper mount; lever arm. File-URL: http://www.inderscience.com/link.php?id=97021 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:125-137 Template-Type: ReDIF-Article 1.0 Author-Name: Feng Ye Author-X-Name-First: Feng Author-X-Name-Last: Ye Author-Name: Qian Huang Author-X-Name-First: Qian Author-X-Name-Last: Huang Author-Name: Zhijian Wang Author-X-Name-First: Zhijian Author-X-Name-Last: Wang Author-Name: Ling Li Author-X-Name-First: Ling Author-X-Name-Last: Li Title: A hybrid fault tolerance framework for SaaS services based on hidden Markov model Abstract: With the booming of cloud computing, more and more applications adopt cloud services to implement their critical business. However, failures causing either service downtime or producing invalid results in such applications may range from a mere inconvenience to significant monetary penalties or even loss of human lives. In critical systems, making the cloud services highly dependable is one of the main challenges. Existing researches show that using fault injection for experimental assessment of fault tolerance architecture for cloud services is still an open problem because of the complexity and diversity of failures in cloud environment. Therefore, we propose a hybrid fault tolerance framework which utilises replication and design diversity techniques for SaaS service. In order to verify the effectiveness of the fault tolerance framework in various pragmatic failure scenarios, a mixed fault simulator based on urn and ball model in hidden Markov model is introduced. A series of experiments are carried out for evaluating the reliability of the SaaS service, including single service without replication, single service with retry or reboot, and a service with spatial replication. The results show that the mixed fault simulator is flexible for simulating various faults in cloud environment, and both temporal and spatial redundancy have better effect on the availability and reliability improvement of the SaaS service. Journal: Int. J. of Reliability and Safety Pages: 138-150 Issue: 1/2 Volume: 13 Year: 2019 Keywords: hidden Markov model; SaaS; fault tolerance; cloud services. File-URL: http://www.inderscience.com/link.php?id=97022 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:1/2:p:138-150 Template-Type: ReDIF-Article 1.0 Author-Name: Xin Zhang Author-X-Name-First: Xin Author-X-Name-Last: Zhang Author-Name: Jianmin Zhao Author-X-Name-First: Jianmin Author-X-Name-Last: Zhao Author-Name: Xianglong Ni Author-X-Name-First: Xianglong Author-X-Name-Last: Ni Author-Name: Haiping Li Author-X-Name-First: Haiping Author-X-Name-Last: Li Author-Name: Fucheng Sun Author-X-Name-First: Fucheng Author-X-Name-Last: Sun Title: Bearing health assessment based on Hilbert transform envelope analysis and cluster analysis Abstract: The rolling bearings are one of the most critical and prevalent elements in rotating machinery. It is necessary to develop a suitable health assessment method to prevent malfunctions and breakages during operation. In this paper, a novel health assessment method for bearings based on Hilbert transform envelope analysis and cluster analysis is proposed. The high-pass filter and Hilbert transform envelope analysis are used to enable the original signal to become smooth and gentle, so as to reduce the influence of noise. And the combination of time domain features parameters is chosen to evaluate the bearing health state. Then extracted feature parameters are clustered by using improved K-means algorithm. In this paper, bearing degradation data and fault data are used to prove the effectiveness of the method. Journal: Int. J. of Reliability and Safety Pages: 151-165 Issue: 3 Volume: 13 Year: 2019 Keywords: cluster analysis; bearing; Hilbert transform; envelope analysis; high-pass filter; health assessment; feature parameter; K-means algorithm; degradation; rotating machinery. File-URL: http://www.inderscience.com/link.php?id=101311 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:3:p:151-165 Template-Type: ReDIF-Article 1.0 Author-Name: Vandana Gupta Author-X-Name-First: Vandana Author-X-Name-Last: Gupta Author-Name: Rahul Kumar Author-X-Name-First: Rahul Author-X-Name-Last: Kumar Title: An optimal rejuvenation scheme for improving VoIP service reliability in the existence of resource exhaustion and security breaches 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. Journal: Int. J. of Reliability and Safety Pages: 166-178 Issue: 3 Volume: 13 Year: 2019 Keywords: VoIP; software rejuvenation; CTMC; continuous time Markov chain; system reliability; MTTF; mean time to failure. File-URL: http://www.inderscience.com/link.php?id=101317 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:3:p:166-178 Template-Type: ReDIF-Article 1.0 Author-Name: Rana Majumdar Author-X-Name-First: Rana Author-X-Name-Last: Majumdar Author-Name: P.K. Kapur Author-X-Name-First: P.K. Author-X-Name-Last: Kapur Author-Name: Sunil K. Khatri Author-X-Name-First: Sunil K. Author-X-Name-Last: Khatri Author-Name: A.K. Shrivastava Author-X-Name-First: A.K. Author-X-Name-Last: Shrivastava Title: Effort-based software release and testing stop time decisions Abstract: To remain competitive and at the same time to satisfy the users' desire, these days software organisations are releasing the software early and removing the remaining number of bugs based on users' feedback or report in the post-release testing phase. Early release may affect software performance due to inadequate elimination of faults due to which the manufacturer may bear post-release cost of fixing the undetected faults. On the other hand, late release may increase the risk of more failures in the functioning environment. Software reliability can be achieved by efficient testing and testing is directly proportional to testing effort/resources consumed. In this paper, we propose a testing effort-based cost model to determine the optimal release and testing stop time and corresponding optimal effort consumed by minimising the total cost. Numerical illustration is done to validate the proposed cost model. Journal: Int. J. of Reliability and Safety Pages: 179-193 Issue: 3 Volume: 13 Year: 2019 Keywords: software reliability; release decisions; post-release testing; cost modelling; optimisation. File-URL: http://www.inderscience.com/link.php?id=101318 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:3:p:179-193 Template-Type: ReDIF-Article 1.0 Author-Name: Sana Perveen Author-X-Name-First: Sana Author-X-Name-Last: Perveen Author-Name: Haroon Ashfaq Author-X-Name-First: Haroon Author-X-Name-Last: Ashfaq Author-Name: Mohammad Asjad Author-X-Name-First: Mohammad Author-X-Name-Last: Asjad Title: A fuzzy-based failure mode effect and criticality analysis of solar photovoltaic systems 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. Journal: Int. J. of Reliability and Safety Pages: 194-210 Issue: 3 Volume: 13 Year: 2019 Keywords: FMEA; failure mode and effect analysis; SPV system; fuzzy RPN. File-URL: http://www.inderscience.com/link.php?id=101319 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:3:p:194-210 Template-Type: ReDIF-Article 1.0 Author-Name: Zuhair A. Al-Hemyari Author-X-Name-First: Zuhair A. Author-X-Name-Last: Al-Hemyari Author-Name: Alla K. Jiheel Author-X-Name-First: Alla K. Author-X-Name-Last: Jiheel Title: A TSST of the reliability function for exponential failure model using type II censored data with minimum cost of experimentations 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 (λ<SUB align=right><SMALL>0</SMALL></SUB>) about the unknown parameter λ. The TSST is dependent upon a convenient shrinking factor, conventional estimators, the 'right censored plan' of s<SUB align=right><SMALL>j</SMALL></SUB> 'ordered observations' of a variable sample of 'size' S<SUB align=right><SMALL>j</SMALL></SUB> and by developing five 'testing regions' for screening the 'closeness' of λ<SUB align=right><SMALL>0</SMALL></SUB> 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. Journal: Int. J. of Reliability and Safety Pages: 211-234 Issue: 3 Volume: 13 Year: 2019 Keywords: reliability function; Bessel's function; exponential failure model; two-stage shrinkage; minimum experimentation; type II censored data; efficiency. File-URL: http://www.inderscience.com/link.php?id=101320 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:3:p:211-234 Template-Type: ReDIF-Article 1.0 Author-Name: Om Prakash Bharti Author-X-Name-First: Om Prakash Author-X-Name-Last: Bharti Author-Name: R.K. Saket Author-X-Name-First: R.K. Author-X-Name-Last: Saket Author-Name: S.K. Nagar Author-X-Name-First: S.K. Author-X-Name-Last: Nagar Title: Reliability assessment and performance analysis of DFIG-based WT for wind energy conversion system 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. Journal: Int. J. of Reliability and Safety Pages: 235-266 Issue: 4 Volume: 13 Year: 2019 Keywords: renewable energy; WECS; wind energy conversion systems; WT; wind turbine; synchronous generator; PMSG; permanent magnet synchronous generator; DFIG; doubly fed induction generator. File-URL: http://www.inderscience.com/link.php?id=102878 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:4:p:235-266 Template-Type: ReDIF-Article 1.0 Author-Name: Sanjay Kumar Author-X-Name-First: Sanjay Author-X-Name-Last: Kumar Author-Name: K.S. Anand Kumar Author-X-Name-First: K.S. Anand Author-X-Name-Last: Kumar Author-Name: Sachin Kumar Author-X-Name-First: Sachin Author-X-Name-Last: Kumar Author-Name: Om Prakash Bharti Author-X-Name-First: Om Prakash Author-X-Name-Last: Bharti Author-Name: Lokesh Varshney Author-X-Name-First: Lokesh Author-X-Name-Last: Varshney Author-Name: R.K. Saket Author-X-Name-First: R.K. Author-X-Name-Last: Saket Author-Name: D.N. Vishwakarma Author-X-Name-First: D.N. Author-X-Name-Last: Vishwakarma Title: Probabilistic evaluation and design aspects for reliability enhancement of induction motor 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. Journal: Int. J. of Reliability and Safety Pages: 267-290 Issue: 4 Volume: 13 Year: 2019 Keywords: probabilistic evaluation; design aspect; induction motor; reliability improvement; MTBF; MTTF; failure rate; exponential distribution function. File-URL: http://www.inderscience.com/link.php?id=102879 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:4:p:267-290 Template-Type: ReDIF-Article 1.0 Author-Name: Rakesh Garg Author-X-Name-First: Rakesh Author-X-Name-Last: Garg Title: Parametric selection of software reliability growth models using multi-criteria decision-making approach 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. Journal: Int. J. of Reliability and Safety Pages: 291-309 Issue: 4 Volume: 13 Year: 2019 Keywords: software reliability; SRGMs; software reliability growth models; NHPP; MCDM; multi-criteria decision making; selection indexes; VIKOR. File-URL: http://www.inderscience.com/link.php?id=102888 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:4:p:291-309 Template-Type: ReDIF-Article 1.0 Author-Name: Rania M. Kamal Author-X-Name-First: Rania M. Author-X-Name-Last: Kamal Author-Name: Moshira A. Ismail Author-X-Name-First: Moshira A. Author-X-Name-Last: Ismail Title: On the mixture of flexible Weibull extension and Burr XII distributions 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. Journal: Int. J. of Reliability and Safety Pages: 310-334 Issue: 4 Volume: 13 Year: 2019 Keywords: mixture models; flexible Weibull distribution; Burr XII distribution; reliability; failure rate function; quantile function; moments; order statistics; estimation; Fisher's information matrix. File-URL: http://www.inderscience.com/link.php?id=102889 File-Format: text/html File-Restriction: Access to full text is restricted to subscribers. Handle: RePEc:ids:ijrsaf:v:13:y:2019:i:4:p:310-334