摘要
轨道交通技术的发展对制动系统的电气化与智能化提出了更高的要求,电机械制动系统必将成为新一代制动系统的发展方向。以踏面电机械制动单元为研究对象,采用Matlab/Simpack联合仿真,建立电机械制动单元-车辆-轨道-控制耦合模型,获得地铁车辆启动加速、惰行、减速以及制动等运行工况下的时间-载荷历程。采用雨流计数法,统计并给出载荷谱。运用Miner损伤理论,综合电机械制动单元工作时载荷情况,进行丝杆服役寿命分析计算,静应力分析表明,踏面电机械制动单元最大应力为261 MPa,第一圈滚珠与丝杠的接触位置,考虑车轮和闸瓦同时磨耗到限状态下,最大应力为301 MPa,出现在第一圈滚珠与丝杠的接触位置。其理想状态下的服役寿命约为6.34年,而基于多工况融合其服役寿命约低于4.41年,需进一步优化。
The development of rail transit technology has put forward higher requirements for the electrification and intelligence of the braking system,and the electro-mechanical braking system will become the development direction of the new generation of braking system.The tread electro-mechanical braking unit was taken as the research object,and the coupling model of electro-mechanical braking unit-vehicle-track-control was established by using Matlab/Simpack co-simulation to obtain the time-load history of subway vehicle under startup acceleration,idle running,deceleration and braking operating conditions.The rain flow counting method was used to calculate and the load spectrum was given.The miner’s damage theory was used to analyze and calculate the service life of the lead screw,and the static stress analysis showed that the maximum stress of the tread electro-mechanical brake unit was 261 MPa,the contact position of the first ball and the lead screw,and the maximum stress was 301 MPa under the condition that the wheel and brake shoe were worn to the limit simultaneously,which appeared in the first circle of ball and screw contact position.Its service life was about 6.34 years under ideal conditions,while its service life was less than4.41 years based on multi-condition fusion,which needed further optimization.
作者
吴杨帆
吴萌岭
田春
陈超
Wu Yangfan;Wu Mengling;Tian Chun;Chen Chao(Institute of Railway and Urban Rail Transit,Tongji University,Shanghai 201800,China)
出处
《机电工程技术》
2022年第4期60-64,共5页
Mechanical & Electrical Engineering Technology
关键词
电机械制动
多体动力学建模
雨流计数法
疲劳寿命
electro-mechanical braking
multi-body dynamics modeling
rain flow counting method
fatigue life
