Service Reliability Assessment of Weld Repaired CrMoV Steel Rotors

2007 ◽  
Vol 78 (1) ◽  
pp. 52-57
Author(s):  
Guodun Wang ◽  
J. Ernesto Indacochea ◽  
Youngkun Oh
Keyword(s):  
Reliability Assessment ◽  
Service Reliability

Damage Modes and Strength Reliability Strategies of Railway Wheel Set

2010 ◽  
Vol 118-120 ◽  
pp. 80-89 ◽  
Author(s):  
Yong Xiang Zhao ◽  
Bin Zhang
Keyword(s):  
Life Prediction ◽  
Growth Models ◽  
Reliability Assessment ◽  
Damage Analysis ◽  
Service Reliability ◽  
Growth Behaviour ◽  
Railway Wheel ◽  
Professional Societies ◽  
Stable Growth ◽  
Non Destructive

Damage modes, causes, and effects of railway wheel set are investigated from wide production fields. And then, the reliability strategies are classified as service reliability and development reliability. The development one includes design, material and manufacturing, quality approval/authentication, which is a basis of the service one. The service one is the true product quality, which has not only the basis of development reliability but also the effects of non-destructive monitoring level, damage analysis and assessment capacity, and repairing and renewing policies. Reliability of wheel set is so important that a series of code-based regularities have been issued by professional societies or associations. Optimal design is a most effective way to improve wheel set reliability. And in service, non-destructive inspection and repair opportunities are valuable to be synthetically programmed. The critical damage defect/flaw sizes should be scientifically determined. Three advances in strength reliability field should be introduced. They are affordable and appropriate method for reliability assessment and fatigue life prediction including the super long life regime, no-Paris type crack growth models which include crack initiation, stable growth, and approach fracture, and fatigue S-N relation derived from short cracking growth behaviour.

scholarly journals Cloud service reliability assessment approach based on multi-valued neutrosophic cross-entropy and entropy measures

Filomat ◽  
2018 ◽  
Vol 32 (8) ◽  
pp. 2793-2812 ◽  
Author(s):  
Yi Wang ◽  
Xiao-Kang Wang ◽  
Jian-Qiang Wang
Keyword(s):  
Decision Making ◽  
Reliability Assessment ◽  
Cloud Service ◽  
Cross Entropy ◽  
Distance Measures ◽  
Service Reliability ◽  
Entropy Measures ◽  
Assessment Approach ◽  
Criteria Weights ◽  
Better Than

Cloud service reliability assessment is a vital decision-making activity for companies and individuals. In this assessment, the evaluation information can be represented by multi-valued neutrosophic numbers (MVNNs). MVNNs are regarded as an integration of single-valued neutrosophic numbers (SVNNs) and hesitant fuzzy numbers (HFNs); therefore, considering the defects of entropy and crossentropy measures for SVNNs and HFNs, we first define a framework of entropy measures and a family of cross-entropy measures for MVNNs in this paper. Second, a novel extended VIKOR (VlseKriterijumska Optimizacija I Kompromisno Resenje) method based on entropy and cross-entropy measures is developed to address the decision-making problems when information about criteria weights is absolutely unknown. Finally, we apply the proposed method to evaluate cloud service reliability; also, a sensitivity analysis and a comparative analysis are made to interpret the practicality and effectiveness of it. The results of analyses verify that the proposed method based on cross-entropy is much better than the methods using general distance measures.

A Service Reliability Assessment Method for the Rigidity-Flexibility Coupling Open Arc Welding Robot

2013 ◽  
Vol 365-366 ◽  
pp. 780-783 ◽  
Author(s):  
Xing Han ◽  
Chang Li ◽  
Xiao Gang Ma
Keyword(s):  
Arc Welding ◽  
Reliability Assessment ◽  
Welding Process ◽  
Mathematic Model ◽  
Monte Carlo Sampling ◽  
Assessment Method ◽  
Service Reliability ◽  
Virtual Model ◽  
Welding Robot ◽  
Stochastic Errors

The open arc welding robots have been used widely nowadays; however, the elastic deformations of every inner link inevitably affect the welding quality. In this paper, it proposes an effective method of service reliability assessment for the rigidity-flexibility coupling open arc welding robot. Firstly, a parametric virtual model of the robot is built in ADAMS/View-AutoFlex module. Secondly, the stochastic errors generated in the working process are simulated by a program created from pseudo-random numbers which have been written by multiplicative congruence method. Lastly, Monte Carlo sampling calculation is implemented for the virtual model, and large sample data of the dynamic characteristics in welding process are obtained and used to calculate the service reliability of the welding robot. This method includes simplicity (no need to solve complex mathematic model) and high accuracy which make it highly promising for application in mechanism design.

scholarly journals Manufacturing service reliability assessment in cloud manufacturing

Procedia CIRP ◽  
2018 ◽  
Vol 72 ◽  
pp. 940-946 ◽  
Author(s):  
Khamdi Mubarok ◽  
Xun Xu ◽  
Xinfeng Ye ◽  
Ray Y Zhong ◽  
Yuqian Lu
Keyword(s):  
Reliability Assessment ◽  
Cloud Manufacturing ◽  
Service Reliability
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