火炮自动装填系统摆动机构的运动精度可靠性与灵敏度

The Kinematic Accuracy Reliability and Reliability Sensitivity Analysis of a Swing Mechanism with the Automatic Loading System of a Cannon

为高效准确地分析某自动装填系统摆动机构的运动精度可靠性,并分析其尺寸参数的可靠性灵敏度,构建摆动机构运动学模型。考虑摆动机构尺寸误差以及铰接间隙的影响,利用稀疏网格数值积分方法获得运动学响应变量的前4阶统计矩,通过鞍点估计方法得到运动学响应变量的概率密度函数,获得某自动装填系统摆动机构运动精度可靠度,并以此为条件通过计算得到尺寸参数的可靠性灵敏度分析结果。研究结果表明:新方法的计算结果能够较好地吻合蒙特卡洛方法获得的结果,且所需样本点较少,验证了方法的有效性,同时计算所得的摆动机构运动精度的失效概率较小,运动精度可靠性较高;主动臂长度对运动可靠性影响较大,其余参数影响较小,为摆动机构基于可靠性的设计提供了参考。

This study aims to analyze the kinematic accuracy reliability of a swing mechanism with an automatic loading system and calculate the reliability sensitivity of dimension parameters.A kinematical model of the swing mechanism is thus established.Considering the influence of dimension error of the swing mechanism and joint clearance,the first four statistical moments are obtained by using the spare grid numerical integration method,and the probability density function of the kinematic response variable is obtained using the saddle point estimation method.The kinematic accuracy reliability of the swing mechanism with the automatic loading system is then calculated,and the reliability sensitivity analysis of dimension parameters is performed based on the results.The simulation results show that the calculation results in the study are identical to those acquired using the Monte Carlo method while requiring fewer sample points.The effectiveness of the methods in the paper is verified,and there is less failure probability of the swing mechanism kinematic accuracy,indicating high reliability in kinematic accuracy.The reliability sensitivity analysis of the dimension parameters reveals that the length of the driving arm has a larger influence on the kinematic reliability,while the other parameters have less influence.This provides references for the reliability-based design of the swing mechanism.