基于蒙特卡洛法的矿用车辆减震器支座可靠性分析

Reliability Analysis of Damper Seat of Mining Truck Based on Monte Carlo Method

矿用车辆中减震器支座和活塞杆的刚性连接方式使得减震器的可靠性容易发生失效破坏。为分析矿用车辆减震器支座的可靠性,首先采用我国自主品牌的CMT96型矿用卡车在不同的标准道路进行测试,收集得到减震器部位的震动位移数据,处理为可用于台架试验的载荷谱;然后建立力学模型,对处理后的载荷谱进行理论分析,并采用蒙特卡洛方法对基于路谱载荷的应力—强度干涉模型进行数值模拟;最后选取了200个道路谱样本进行台架耐久性试验,并进行了对比验证和分析。研究表明:矿用车辆的减震器可靠性值在1.6万km以内为1,1个完整的路谱周期过后呈现阶梯式下降规律,直至0.86,略低于模拟结果 0.95。大样本训练数量总体上反映了减震器支座的变形规律,采用蒙特卡洛方法并基于路谱载荷的应力—强度干涉模型对矿用车辆减震器进行可靠性分析,对于矿用车辆减震器支座的可靠性设计有一定的参考意义。

The rigid connection of the shock absorber support and the piston rod in the mining vehicle makes the reli-ability of the shock absorber prone to failure and damage.In order to study the reliability of the shock absorber support formining vehicles,firstly,Chinese self-owned brand mining truck(CMT96)was used to test on different standard roads,the vi-bration displacement data of the shock absorber was collected,and processed for a load spectrum used for bench experiments.Then,the mechanical model was established,and the theoretical analysis was carried out through the stress-strength interfer-ence model based on the processed load spectrum.Finally,200 road spectrum samples were selected for bench durabilitytest,and comparative verification and analysis were conducted. The study results showed that the reliability value of theshock absorber of the mining vehicle within 16 000 km is 1,and after one complete road spectrum cycle,which was slightlylower than the simulated result of 0.95.The large number of training samples reflects the deformation law of the shock absorb-er bearing on the whole.The Monte Carlo method based on the stress-strength interference model of road spectrum load wasused to analyze the reliability of the shock absorber bearing of mining vehicles,which has a certain reference significance forthe reliability design of the damper seat of mining vehicles.