Journal of Applied Mechanical Engineering

Fusion design of mechanical system reliability allocation and robust design

4^th International Conference and Exhibition on Mechanical & Aerospace Engineering

October 03-04, 2016 Orlando, USA

Yang Zhou and Cheng Jia

Northeastern University, PR China

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

In current reliability robust design method, the target reliability of constraint condition is specified by a value determined, while other factors that affect the reliability of the subsystem are not considered. The paper in view of the reliability design related issues, a comprehensive robust design method which considers reliability allocation is proposed. Based on FMEA nonlinear third-order correction conversion function, by considering the correlation of failure mode, failure frequency and failure severity, a reliability allocation method of tandem system based on gumbel copula function is established. The reliability allocation method obtain the reliability of each subsystem combining Kendall Ï? related coefficient of failure, and then using the fourth-order moment theory of edge-worth series method and subsystem reliability that obtained from reliability allocation, the important part of the subsystem is optimized by reliability robust design, and sensitivity analysis is carried out to prove this result. The method comprehensively considers the integration of mechanical systems and the correlation between subsystems, and reduces the sensitivity of the variables to the maximum extent under the condition of the reliability of the subsystem. So, parts and overall system robustness are improved. The CNC lathes spindle system, as example, which contains the main spindle system reliability allocation and spindle reliability-based robust design, to illustrate the characteristics and applicability of the method. This new method not only in theory, but also in practice to reflect and implement the specific reliability index, so as to guide the design and research, reduce the processing and maintenance costs.

Biography :

Email: yangzhou790823@163.com