Helicopter Reliability Growth Evaluation

1976 ◽  
Author(s):  
G. S. Conway
Keyword(s):  
Reliability Growth ◽  
Growth Evaluation ◽  
Helicopter Reliability

A novel GREY‒ASMAA model for reliability growth evaluation in the large civil aircraft test flight phase

2019 ◽  
Vol 10 (1) ◽  
pp. 46-55
Author(s):  
Sifeng Liu ◽  
Wei Tang ◽  
Dejin Song ◽  
Zhigeng Fang ◽  
Wenfeng Yuan
Keyword(s):  
Test Data ◽  
Grey Model ◽  
Reliability Growth ◽  
Limited Data ◽  
Content Type ◽  
Flight Phase ◽  
Virtual Test ◽  
Civil Aircraft ◽  
Test Flight ◽  
Growth Evaluation

Purpose The purpose of this paper is to present a novel GREY‒ASMAA model for reliability growth evaluation in the large civil aircraft test flight phase. Design/methodology/approach As limited data are collected during the large civil aircraft test flight phase, which are not enough to meet the requirements of the ASMAA model for reliability growth, four basic GM(1, 1) models, even grey model, original difference grey model, even difference grey model and discrete grey model, are presented. Then both forward and backward grey models GM(1,1) are built to forecast and obtain virtual test data on left and right sides. Then the ASMAA model for reliability growth evaluation can be built based on original and virtual test data. Findings Aiming at the background of poor information data during the large civil aircraft test flight phase, first, a novel GREY‒ASMAA model, which was combined by the grey model GM(1,1) with the ASMAA model, has been put forward in this paper. Practical implications The GREY‒ASMAA model for reliability growth evaluation can be used to solve the problem of reliability growth evaluation with poor information data during the large civil aircraft test flight phase, and it has been used in reliability evaluation of C919 at the test flight stage. Originality/value This paper presents two new definitions of forward grey model GM(1,1) and backward grey model GM(1,1), as well as a novel GREY‒ASMAA model for reliability growth evaluation of large civil aircraft during test flight phase.

Monotone Constraint Model Applied to the Reliability Growth Evaluation of Electromechanical Products

2014 ◽  
Vol 875-877 ◽  
pp. 2042-2046
Author(s):  
Min Huang ◽  
Jun Yi ◽  
Wei Wang
Keyword(s):  
Weibull Distribution ◽  
Comprehensive Evaluation ◽  
Growth Management ◽  
Reliability Growth ◽  
Censored Samples ◽  
Electromechanical Products ◽  
Growth Evaluation ◽  
Constraint Model ◽  
Electromechanical Product ◽  
Growth Assessment

Reliability growth assessment is an important part of the reliability growth management. According to the characteristic that the lifetime of electromechanical product obeys the Weibull distribution, the thesis provides a monotonous constraint model of reliability growth of Weibull distribution, including complete Samples and censored samples. The method proposed in this paper has been verified by actual data, and has good adaptability. The comprehensive evaluation results of MTBF are higher than those got through only utilizing the test data of the last stage.Background Information

Research of Reliability Growth Evaluation of CNC Machine Tools Based on Weibull Distribution

2013 ◽  
Vol 694-697 ◽  
pp. 1812-1816 ◽  
Author(s):  
Jie Yu ◽  
Shuang Yu ◽  
Yu Mei Song ◽  
Ting Ting Wang ◽  
Qiao Chan Li ◽  
...  
Keyword(s):  
Weibull Distribution ◽  
Dynamic Modeling ◽  
Machine Tools ◽  
Test Phase ◽  
Small Samples ◽  
Cnc Machine Tools ◽  
Reliability Growth ◽  
Cnc Machine ◽  
Duane Model ◽  
Growth Evaluation

In light of the characteristics and small samples of the research of the CNC machine tools based on Weibull distributions，dynamic modeling and middle rank are used to evaluate the failure rate of each test phase. Traditional Duane model are referred to fit parameters of the reliability growth model with least squares.

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