多因素影响下的连杆机构可靠性分析

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连杆机构可靠性通常研究机构能否有效运转,以及动起来之后是否准确。综合考虑尺寸误差、装配误差、间隙、摩擦系数、载荷、速度共6种因素的影响下,基于多体动力学理论和间隙碰撞理论对典型机构进行建模,并假定上述6种影响因素为正态分布,且相互独立。然后应用MonteCarlo抽样仿真的方法对机构可靠性进行分析,进一步研究各个影响因素在不同变化范围的水平下,对机构可靠度的影响大小,从而确定主要影响因素,为后续机构可靠性研究设计提供了参考。对于其他机构的可靠性研究,也具有一定借鉴意义。 The reliability analysis for link mechanism usually concerns the effectiveness and accuracy of the motion of the mechanism. Considering the influence of dimensional errors, clearances, assembling er- rors, friction coefficients, input driving velocities and external loads comprehensively, the typical mecha- nism model based on multi-rigid-body dynamics and clearance contact theory is established. Assuming that the above factors follow normal probability distribution are independent with each other, the mecha- nism reliability is analyzed by using the Monte Carlo sampling simulation method, and the effects of the a- bove factors on the mechanism reliability are studied further. Then, the significant factors can be identi- fied. The analysis can provide reference for the subsequent reliability analysis of the mechanism. Mean- while, for the reliability analysis of other mechanisms, this paper makes sense for reference.