多因素耦合下机构运动精度可靠性仿真试验及寿命评估

Reliability Simulative Trial of Kinematic Accuracy and Life Evaluation for Planar Mechanism with Multi-factor Coupling

针对影响平面机构运动精度因素较多且不能忽视的问题,将影响机构运动精度可靠性因素分为非累积性因素和累积性因素,提出了非累积性因素和累积性因素耦合作用下平面机构的运动精度可靠性仿真试验方法;根据可靠性仿真试验得出了累积性因素中机构允许的最大磨损量,利用Archard磨损模型分析铰链的磨损速率,然后基于最大允许磨损量和磨损速率建立了概率可靠性寿命评估模型和模糊可靠性寿命评估模型,根据该模型分别对机构进行寿命评估,并进行了对比。以曲柄滑块机构为例进行分析,得到了该机构不同铰链间隙下运动精度可靠度以及该机构的可靠性寿命,验证了方法的可行性。

Aiming at the factors that affect kinematic accuracy of planer mechanism is more and cannot be ignored,the influence factors of the reliability in kinematic accuracy of planar mechanism are classified as non-cumulative factors and cumulative factors. The reliability simulation trial for kinematic accuracy of planar mechanism under the condition of coupling non-cumulative and cumulative factors is proposed. According to the reliability simulative trial,the allowed maximum wear capacity in mechanism is obtained,the wear rate of hinge is analyzed by using Archard wear model. The life evaluation model of probability reliability and the life evaluation model of fuzzy reliability are established on the basis of the allowed maximum wear capacity and the wear rate. The life evaluation of mechanism is carried out respectively by each model and the evaluation model is compared one to the other. Taking slider-crank mechanism as an example to analyze,the kinematic accuracy under the conditions of different hinge gap and reliable life of mechanism is obtained,the feasibility of method is verified.