扩展工况传递路径分析方法改进

摘要

Here,an optimal way to improve the operational-X (OPAX)transfer path analysis method's accuracy was presented to calculate dynamic stiffness using the inverse sub-structuring technology,to process measured signals with the wavelet de-noising technology,and to predict loads with a neural fuzzy logic algorithm.Taking a microbus as a user example,some data were measured including the frequency response functions (FRFs)of system level and component level,the dynamic stiffness of engine mounts,and the vibration acceleration signals of imput and response points when the microbus was running.Then,the dynamic stiffness,the loads and the transfer path contributions (TPCs)were calculated using the optimized OPAX method and the OPAX one with MATLAB procedures programmed,respectively.Taking the dynamic stiffness, the loads and TPCs obtained with the conventional transfer path analysis method or tests as benchmarks,comparing them with those calculated,the results indicated that the optimized OPAX method has a higher accuracy than the OPAX method does.This study enriched the theory of the OPAX method.%为提高扩展工况传递路径分析（OPAX）方法的精度，提出用逆子结构技术计算动刚度、测试信号降噪处理和用神经模糊逻辑算法测算载荷的改进方法。以一款微型客车为验证对象，测试系统水平和子结构水平频响函数、悬置动刚度以及车辆行驶中激励点和响应点加速度信号；利用Matlab软件建立程序，分别用改进OPAX方法和已有OPAX方法计算动刚度、载荷和传递路径贡献量；以用传统传递路径方法所得结果或测试结果作为标杆，将这三个参数分别与之作对应比较，比较显示改进方法得到的结果具有较高的精度。所作研究也丰富了OPAX方法理论。