Robust optimization design for car bodies’ noise transfer functions based on six sigma
NIE Zuo-xing1，YU De-jie2，ZHOU Jian-wen1，ZHOU Zhou1
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1.China Automotive Engineering Research Institute, Chongqing 400039，China；2.State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082，China
In order to improve the design robustness of the vehicle’s NVH performance, a six sigma robust optimization method is introduced into the optimization process of noise transfer functions. In this method, the influence of various uncertain factors which result from objective functions, design variables and constraint conditions are considered by integrating six sigma quality management approach, reliability design approach and robust design approach into the optimization design process. Therefore, not only the proper optimal solution and reliability of system are achieved but also the robustness of production design process is improved. Based on the acoustic-structure coupling finite element model and the quadratic response surface approximate model, the proposed method is implemented to optimize the noise transfer function of a car body. In this numerical example, the probabilistic characteristics of the design variables are known, total mass and the first natural frequency of a car body are considered as constrains, and the root mean square value of SPL measured near the driver’s ear is defined as the objective function. The result verifies the accuracy and efficiency of the proposed method, compared with traditional deterministic optimization design.
NIE Zuo-xing;YU De-jie;ZHOU Jian-wen;ZHOU Zhou.
Robust optimization design for car bodies’ noise transfer functions based on six sigma [J]. Journal of Vibration and Shock, 2014, 33(14): 155-159
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