汽车盘式制动器的拖滞仿真分析

针对制动拖滞会降低制动器的使用寿命,增加整车油耗的问题。以盘式浮动制动器为研究对象,对拖滞因素进行了概述,并对断面跳动和零部件刚度两方面的因素作了深入分析。理论上,得出了端面跳动与制动器工作间隙的关系;通过对制动器进行受力变形分析,得出了零部件变形量与拖滞参量的关系。建立了考虑两方面影响因素的仿真模型,并通过试验结果验证了模型的可行性,由仿真得出了制动器主要部件的刚度及制动盘的端面跳动对拖滞的影响规律。此仿真方法可以用于分析拖滞因素及在设计阶段评估拖滞。

基于侧面碰撞工况下B柱抗弯性能优化设计

基于侧碰工况,选取B柱薄弱截面,将其等效简化为单帽型薄壁梁.建立三点弯曲试验模型,研究单帽梁的抗弯性能.选取截面长宽比和外板厚度为设计变量,加载力峰值和比吸能为优化指标,轻量化和抗弯稳定性为约束条件.利用最优拉丁超立方设计采取30组样本点,建立优化目标的响应面模型,通过NCGA遗传算法进行多目标优化.优化后最大加载力下降7.87%,比吸能提高14.4%,同时加载力波动度下降10.5%,质量下降8.97%.抗弯性能得到显著提高.

Analysis of Impact of Disc Lateral Runout on Brake Drag

Brake drag is the main factor affecting the transmission efficiency and vehicle fuel consumption. This paper focused on analyzing the impact of assembled disc lateral runout on brake drag. First the impact mechanism of lateral disc runout on drag was analyzed theoretically. Then the brake drag torque under different assembled disc lateral runout was tested to figure out the relationship between them. And then, the influence factors on disc lateral runout were analyzed and the disc lateral runout was optimized. Finally, the vehicle resistance of the original car and the prototype with optimized brake were compared. The result shows that the vehicle resistance after optimized is reduced by 3%.