新型客车磁流变缓速器制动力计算与仿真

Braking moment calculation and simulation of a novel coach magnetorheological retarder

随着汽车工业的进步,商用汽车逐步向高速及大型化发展,制动安全问题日益突出。安装辅助制动装置是实现大型车辆安全制动的重要途径之一。文章分析传统电涡流缓速器及液力缓速器优缺点,设计一种新型的单盘型客车磁流变缓速器。该缓速器在挤压-剪切混合模式下工作;以磁流变液(MRF)的流变特性为基础,推导该缓速器制动力矩计算公式,并在MATLAB环境下对该制动力矩公式进行仿真和分析,结果显示客车磁流变缓速器制动力矩主要与磁场强度大小有关,与转速和磁流变液间隙厚度关系很小。

With the advance of automotive industry, commerc into high speed and large-scale vehicles. As the braking fun ial vehicles are gradually developing ction of the commercial vehicle has faced great challenges, installing auxiliary braking device is an effective way to achieve the safe braking of large-scale vehicles. The advantages and disadvantages of the traditional eddy current re- tarder and magnetorheological retarder were analysed. A novel coach single-plate magnetorheological retarder was designed, which operates under compression plus shear mode. Based on the rheological properties of magnetorheological fluid （ MRF）, the braking moment was derived and simulated. The results indicate that the braking moment mainly depends on the intensity of magnetic field and is hardly affected by the speed and the thickness of MRF.