压缩机复杂管路压力脉动及管道振动研究

Study on Pressure Pulsation and Piping Vibration of Complex Piping of Reciprocating Compressor

围绕往复式压缩机管道系统的振动及往复式压缩机的管道压力脉动问题,依据平面波动理论,采用转移矩阵和刚度矩阵计算出复杂管路的气柱固有频率和压力脉动。借助于有限元方法的离散思想,建立了往复式压缩机管道振动及应力分析的数学模型,提出了恰当的边界条件,利用基于有限元的管道分析软件CAESARⅡ对模型进行求解,获得了管道系统的振动模态结果。对比试验结果与计算结果发现,利用一维平面波动方程可以比较准确地计算出往复式压缩机管路的气柱固有频率、压力脉动。

This paper presents a preliminary research on the piping vibration and pressure pulsation of reciprocating compressor piping system. On the basis of plane wave theory, the calculation of gas column natural frequency and pressure pulsation in complex pipelines is done by using the transfer matrix method and stiffness matrix method, respectively. With the discretization method of FEM, a mathematical model for calculating the piping vibration and stress of reciprocating compressor piping system is established, and proper boundary conditions are proposed. Then the structural modal and stress of the piping system are calculated with CAESAR II. The comparison of measured and calculated values found that the one dimensional wave equation can accurately calculate the natural frequency and pressure pulsation in gas column of piping system for reciprocating compressor.