摘要:
为了有效指导新型车架的结构和轻量化设计,以某款骑式125摩托车车架为对象,在试验场强化道路上采集载荷谱并进行损伤等效处理,显著压缩试验周期,同时保证与实际道路载荷对样车的疲劳损伤基本一致。利用MTS四通道轴耦合道路模拟试验台,以实测载荷谱为初始输入,在MTS上通过远程参数控制系统RPC等效迭代得到近似实际路面激励的等效输入信号。基于名义应力法和疲劳累积损伤理论,在nSoft中建立车架的时域疲劳分析模型。以等效实际路面激励为仿真输入进行有限元分析,得到车架的疲劳损伤分布并预估车架疲劳寿命。
Abstract:
In order to improve the structure and design a light weight frame of new motorcycle,taking a motorcycle of bestriding 125 as an object,the collection of practical road load spectrum in the proving ground and the treatment of equivalent damage are introduced to compress test cycle significantly while the prototype of fatigue damage are basically the same compared to real road excitation.Using the MTS axis coupled road simulator of four channel test stand,taking the load spectrum for initial input,through the remote parameter control(RPC) system,the closed real road excitation equivalent input signal is obtained by iteration.A time domain fatigue analysis model of the motorcycle frame is built with nSoft software,which is based on the nominal stress method and fatigue damage cumulative theory,taking the equivalent real road excitation as simulation input signal for finite element analysis,the fatigue damage and life of the motorcycle frame are evaluated.
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