Numerical method for Weibull generalized renewal process and its applications in reliability analysis of NC machine tools

2012 ◽  
Vol 63 (4) ◽  
pp. 1128-1134 ◽  
Author(s):  
Zhi-Ming Wang ◽  
Jian-Guo Yang
Keyword(s):  
Numerical Method ◽  
Reliability Analysis ◽  
Renewal Process ◽  
Machine Tools ◽  
Nc Machine ◽  
Nc Machine Tools

Reliability Analysis Based on Improved Bayes Method of AMSAA Model

2012 ◽  
Vol 482-484 ◽  
pp. 2336-2340
Author(s):  
Yang Qiang ◽  
Lei Zhang ◽  
Zhi Li Sun ◽  
Yi Liu ◽  
Xue Bin Bai
Keyword(s):  
Reliability Analysis ◽  
Machine Tools ◽  
Interval Estimation ◽  
Point Estimation ◽  
Life Data ◽  
Failure Data ◽  
Amsaa Model ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Five Axis

Aiming at the defects that failure samples of five-axis NC machine tools is small, traditional reliability analysis is not accurate, this paper presents reliability analysis mode based on improved Bayesian method for AMSAA model. Firstly, we obtain the failure model of NC machine tools meets the AMSAA model according to goodness-of-fit test, and in order to meet the requirements of simplifying engineering calculations, this paper adpots a method of Coefficient equivalent which converts failure Data into index-life data; then using Bayesian methods to estimate reliability parameters for the Index-life data; for the last we proceed point estimation and interval estimation for the MTBF of the machine. Take High-speed five-axis NC machine tools t of VMC650m for example, the result proved that the method can take advantage of a small sample of the equipment to proceed point estimation and interval estimation for MTBF failure data, and provide a reference for the optimization of maintenance strategies and Diagnostic work of the NC machine tools.

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