基于GA-MVFOSM法的DSA250型受电弓运动可靠性分析

为分析运动副磨损与杆件尺寸不确定性2种因素对受电弓运动可靠性的影响，提出一种基于遗传一次二阶矩法(GA-MVFOSM)的受电弓运动可靠性计算方法。首先，构建受电弓运动学方程，应用Archard磨损理论建立其运动副磨损可靠性模型。在此基础上，考虑运动副磨损与杆件尺寸的不确定性，结合可靠性理论建立受电弓运动可靠性模型。其次，利用遗传算法优化一次二阶矩法，提出GA-MVFOSM算法，用以求解受电弓的运动可靠度。最后，以DSA250型受电弓为研究对象，利用所提方法分析其运动可靠性，并与传统方法进行对比。分析结果表明:各运动副磨损量分别在0.230 0 mm、0.136 6 mm、0.006 6 mm内时，运动副磨损可靠度处于较高水平，2种因素耦合情况下弓头运动可靠度最小值为0.964 7；基于遗传一次二阶矩的计算方法可以有效提高传统方法计算精度，为提高受电弓工作可靠性提供参考依据。

Kinematic Reliability Analysis of DSA250 Pantograph Based on GA-MVFOSM Method

In order to analyze the influence of abrasion of kinematic pair and size uncertainty of pantograph members on pantograph kinematic reliability, a method for calculating the kinematic reliability of pantograph based on genetic first order second moment method (GA-MVFOSM) is presented. First, the kinematics equation of pantograph is constructed, using Archard wear theory to establish the reliability model of wear of kinematic pair. On this basis, considering the abrasion of kinematic pair and size uncertainty of rods, the reliability model of pantograph motion was established based on the reliability theory. Finally, DSA250 pantograph was taken as the research object, analyzing the kinematic reliability of it with the method, and compared with traditional method. Analysis results show that: When the wear amount of each kinematic pair is within 0.230 0 mm, 0.136 6 mm and 0.006 6 mm respectively, the kinematic pair wear reliability is at a high level, the minimum value of pantograph head`s kinematic reliability at the condition of the two factors are coupled is 0.964 7; the method based on genetic first order moment can improve the accuracy of traditional method and provide reference for improving the reliability of pantograph.