关键词: 灵敏度分析, 垂向弯曲频率, 设计参数, 系统响应

Abstract: The sensitivity analysis about key parameters of a car-body was carried out with the stiffness optimization method to find the relationship among design variables and system responses, the gradient of the structure variables (key parameters of car-body) for the target functions (first order vertical bending frequency of car-body) was obtained. First, the first order vertical bending frequency equation was built from Euler-Bernoulli theory with initial and boundary conditions. Then, the frequency equation was corrected with car-body characteristics to get an accurate result, and the results were tested by a finite element result of a subway car-body. Finally, sensitivity analysis was done with 6 key parameters for the bending vibration frequency of car-body. The conclusions show the significance sequence of main car-body parameters for first order vertical bending frequency according to the sensitivity, which may give some advices to designers.

Key words: sensitivity analysis, vertical bending frequency, design parameter, system response