一种基于最优多项式模型的车身耐撞性敏感性分析法

A Novel Sensitivity Analysis Method for Vehicle Body Crashworthiness Based on Optimal Polynomial Models

为评价车身耐撞性对结构参数的敏感性,提出了一种基于最优多项式模型的新型全局敏感性分析方法。通过误差减少比率的结构选择技术构造了描述耐撞性指标和结构设计参数之间关系的最优多项式模型,并利用基于直接积分的Sobol方法进行全局敏感性分析。该方法克服了传统方法计算量大、结果不稳定等缺点,车辆正撞和侧撞工程算例的敏感性分析结果表明了该方法的有效性和实用性。

A novel global sensitivity analysis method based on optimal polynomial model is proposed to evaluate the sensitivity of structure parameters to vehicle body crashworthiness. The optimal polynomial models describing the relationship between crashworthiness indicators and structural design parameters are constructed with the structure selection technique for error reduction ratio,and the Sobol global sensitivity analysis is performed by direct integration. The method proposed overcomes the shortcomings of much computation efforts required and insecure results with traditional method. The results of sensitivity analysis for engineering examples of vehicle frontal and side crashes demonstrate the effectiveness and practicality of the method.