动作可靠性分析评价方法

Analysis and Evaluation of Motion Reliability

机构动作失效形式多,各失效之间存在相关性,同时,基于数值计算法很难进行系统动作可靠性的分析计算.为解决这一问题,利用动作可靠性仿真数据获得各失效参数之间的相关系数,并给出了联合密度法、界限法和条件概率法求解系统可靠度的公式,进行了机构动作可靠性的综合评价.所提方法较之独立假设条件下的系统可靠度计算结果,更接近实际.

Many failure modes were found in mechanism motion and there is a correlation between different failure modes. In addition, numerical computation is hard to analyze and calculate the system motion reliability. To solve the problem, the correlation coefficients between different failure parameters are acquired according to the data from the simulation of motion reliability, thus giving the formulae of different method to solve the system reliability, including the joint probability density, bounded and conditional probability methods. Then, a comprehensive evaluation was carried out by any of the methods for the motion reliability of a mechanism, and the result showed that the system reliability thus calculated is more accurate in comparison to that calculated with parameters assumed separately.