管道联接件参数识别的行波法

基于结构振动的行波理论,提出了一种管道联接件物理参数识别的新方法.以未充液直管在平面内的弯曲振动为例,建立了入射波和出射波在联接件处的散射关系,并结合波模式幅值系数的识别,得到一组包含待识别参数的非线性方程组.在每一个频率下求解该方程组得到联接件的动刚度,最后采用最小二乘法一次识别得到联接件的物理参数.数值仿真结果表明,行波法在管道联接件参数辨识中,识别精度高,而且采用矩阵条件数小的传感器阵列,可以提高参数辨识的精度.

Junction Identification in Piping Systems Based on Traveling Wave Method

Based on the traveling wave theory,a new method for determining the junction parameters of piping systems is presented.For the flexural vibration of a pipe without inner fluid,the scattering relation at junctions is obtained.The dynamic stiffness of the junction can be derived by solving these equations for each frequency.Therefore,the parameters of the junction are deduced via least squares techniques.The validity and feasibility of this approach are verified with numerical example,and traveling wave method,accompanying with the critical enables to accurately idenify the junctions.