往复压缩机声学脉动分析及出口管道减振模拟

往复压缩机出口管道振动容易引起管道疲劳破坏,可以通过改变管系内气柱的固有频率来避开往复压缩机的激振频率。结合往复压缩机与管道系统的振动机理及减振方法,建立了往复压缩机结构等效数学模型,利用振动分析软件对机体进行声学脉动模拟,并依据分析结果对其出口管道进行减振设计。研究结果表明:增设孔板可明显降低往复压缩机出口管道的固有频率,使之避开共振响应区域,降低管系气柱压力不均匀度和脉动幅值。模拟结果为往复压缩机的安全使用与疲劳计算提供了科学依据,也为后续的配管设计工作提供了参考。

Acoustic pulsation analysis and outlet pipeline vibration reduction simulation on reciprocating compressor

The vibration of reciprocating compressor outlet pipelines can easily lead to fatigue failure of the pipelines. The excitation frequency of reciprocating compressor can be avoided by changing the natural frequency of the gas column in the pipeline system. In this paper, the equivalent mathematical model of reciprocating compressor structure was established by combining reciprocating compressor’s and pipeline system’s vibration mechanisms and vibration reduction methods. Then, the acoustic pulsation of the compressor was simulated by the vibration analysis software. Finally, vibration reduction design was carried out on the outlet pipelines according to the analysis results. It is shown that increasing the number of orifices can significantly reduce the natural frequency of reciprocating compressor outlet pipelines to keep it out of resonant response range and decrease the pressure unevenness and pulsation amplitude of the gas column in the pipeline system. The simulation calculation provides the scientific basis for the safe operation and fatigue calculation of reciprocating compressors and the theoretical reference for subsequent piping design.