螺纹剪切式碰撞吸能装置最优螺纹参数设计

为解决螺纹剪切式汽车碰撞吸能装置的最优螺纹参数的设计问题，利用UG建模、VPG前处理和LS-NYNA求解计算，进行了针对单因素的计算机仿真试验．对螺纹的4个因素（螺纹高、剪切高、螺纹宽和导程）进行了单因素分析，将各因素的尺寸与最大加速度的关系进行了函数曲线拟合，通过适当调整，构造了4个因素与最大加速度的优化模型．用Matlab软件对优化问题求最值，并结合单因素分析结果获得了最优螺纹尺寸．仿真结果表明：该尺寸满足碰撞评价指标，从而为螺纹剪切式汽车碰撞吸能装置的最优螺纹参数，提供了一种优化设计的新方法．

The design for optimal thread parameters of CST-automobile collision energy absorption device

In order to solve the design problems for optimal thread parameters of CST- automobile collision energy absorption device, usihg UG modeling, VPG pre-processing treatment, LS-NYNA computing, computer simulation experiments, which were aimed at single factor, were adopted, then four single factors （Height of thread, Height of cutting, Width of thread, Lead） were analyzed. The relationship between maximum acceleration and the size of each factor was fitted to function＇s curves, and an optimum model was also set up through an appropriate adjustment. At last, Matlab was used to get minimization of this optimum model, combining with the results of single factors analysis, thus the optimal thread parameters were obtained. Simulation result shows that these optimal thread parameters can meet the evaluation indicator, while collision happens. So it provides a new optimization design method for thread parameters of CST-automobile collision energy absorption device.