Mechanical Component Reliability Calculation through Multi-Plane Combination Method

2013 ◽  
Vol 423-426 ◽  
pp. 1636-1639
Author(s):  
Hai Tao Lu ◽  
Yu Ge Dong
Keyword(s):  
System Reliability ◽  
Combination Method ◽  
Component Reliability ◽  
Performance Function ◽  
Reliability Calculation ◽  
Mechanical Component ◽  
First Order Second Moment ◽  
Estimate System ◽  
Second Moment Method ◽  
Probable Failure

For the performance function with high nonlinearity around the most probable failure region, stress-strength interference model and advanced first-order second-moment method (AFOSM) can cause huge errors in the computation results. The multi-plane combination method is presented to calculate reliability of the mechanical component, in which the component reliability calculation is first transformed into a relatively simple system reliability problem, and then the equivalent calculation method is applied to estimate system reliability. The example application shows the accuracy and efficiency of the multi-plane combination method.

Reliability Model for Complex Mechanical Component Design

2013 ◽  
Vol 365-366 ◽  
pp. 28-31
Author(s):  
Li Yang Xie ◽  
Wen Xue Qian ◽  
Ning Xiang Wu
Keyword(s):  
System Reliability ◽  
Failure Modes ◽  
Statistical Dependence ◽  
Series System ◽  
Reliability Model ◽  
Component Reliability ◽  
Damage Site ◽  
Mechanical Component ◽  
Component Design ◽  
Element Failure

Taking into account the uncertainty in material property and component quality, a complex mechanical component such as a gear should be treated as a series system instead of a component when evaluating its reliability, since there exist many sites of equal likelihood to fail. Besides, conventional system reliability model is not applicable to such a system because of the statistical dependence among the failures of the every element (damage site). The present paper presents a model to estimate complex mechanical component reliability by incorporating order statistic of element strength into load-strength interference analysis, which can deal with multiple failure mechanisms, reflect statistical dependence among element failure events and that among different failure modes.

Engineering Structural Reliability Calculation Based on Algorithm of Most Optimization Calculation and its Realization with Lingo

2010 ◽  
Vol 163-167 ◽  
pp. 3089-3093
Author(s):  
Li Li ◽  
Hong Yi Jiang ◽  
Yi Zheng ◽  
Jia Long Xu ◽  
Mei Zhu Sun
Keyword(s):  
System Reliability ◽  
Optimization Design ◽  
Structural Engineering ◽  
Structural Reliability ◽  
Reliability Theory ◽  
Performance Function ◽  
Reliability Calculation ◽  
Program Calculation ◽  
Optimization Calculation ◽  
Push Forward

Algorithm of most optimization calculation is favor for the most technology personnel, for its result is ideal and it doesn’t need derivative of performance function. Combined with theory of nonlinear programming and method of optimization calculation for structural reliability, the program calculation is written by means of Lingo, including system reliability calculation. With the example, the results prove the method was accurate and fast. It was very efficiency and convenience and objection to make program of Lingo for the reliability calculation, which is grasped for the engineers. So its applying research would push forward application of structural reliability theory and optimization design in structural engineering.

Reliability analysis of a structural element based on the Advanced First-Order-Second-Moment Method.

1985 ◽  
Vol 51 (472) ◽  
pp. 2811-2816
Author(s):  
Yoshisada MUROTSU ◽  
Masaaki YONEZAWA ◽  
Hiroo OKADA ◽  
Satoshi MATSUZAKI ◽  
Toshiki MATSUMOTO
Keyword(s):  
Reliability Analysis ◽  
Moment Method ◽  
Structural Element ◽  
Second Moment ◽  
First Order ◽  
First Order Second Moment ◽  
Second Moment Method

Reliability Assessment of Piping With Cracks Using Advanced First-Order Second-Moment Method

2009 ◽  
Author(s):  
Shinji Yoshida ◽  
Hideo Machida
Keyword(s):  
Safety Factor ◽  
Reliability Assessment ◽  
Limit Load ◽  
Service Level ◽  
Assessment Method ◽  
J Integral ◽  
Reference Stress ◽  
First Order Second Moment ◽  
Fracture Assessment ◽  
Second Moment Method

This paper describes applicability of the 2 parameter assessment method using a reference stress method from the viewpoint of reliability. The applicability of the reference stress method was examined comparing both the GE-EPRI method. As a result, J-integral and limit load at the time of fracture evaluated by the reference stress method is almost equivalent to that by the GE-EPRI method. Furthermore, the partial safety factor (PSF) evaluated by reliability assessment has little difference between two methods, and the required safety factor is enveloped by the safety factor for Service Level-A and B defined in fitness for service (FFS) codes. These results show that of the reference stress method is applicable for J-integral calculation in fracture assessment.

A Partial Safety Factor Method for System Reliability Prediction With Outsourced Components

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Zhengwei Hu ◽  
Xiaoping Du
Keyword(s):  
System Reliability ◽  
Joint Probability ◽  
System Level ◽  
Safety Factors ◽  
Component Reliability ◽  
Reliability Method ◽  
Component Supplier ◽  
Partial Safety Factors ◽  
Joint Probability Density ◽  
Probability Density Function Pdf

System reliability is usually predicted with the assumption that all component states are independent. This assumption may not accurate for systems with outsourced components since their states are strongly dependent and component details may be unknown. The purpose of this study is to develop an accurate system reliability method that can produce complete joint probability density function (PDF) of all the component states, thereby leading to accurate system reliability predictions. The proposed method works for systems whose failures are caused by excessive loading. In addition to the component reliability, system designers also ask for partial safety factors for shared loadings from component suppliers. The information is then sufficient for building a system-level joint PDF. Algorithms are designed for a component supplier to generate partial safety factors. The method enables accurate system reliability predictions without requiring proprietary information from component suppliers.

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