Abstract:

The outlet pipeline of a centrifugal compressor in a certain enterprise vibrates violently, and on site vibration measurement finds that the maximum vibration acceleration of the pipeline is as high as 185.84 m/s². The particle collision damping technology is used to reduce vibration in the outlet pipeline. An analysis of the causes of pipeline vibration is conducted using ANSYS finite element analysis software. It is found that the second-order modal frequency of 13.195 Hz is almost consistent with the measured excitation frequency of 13 Hz. It is concluded that the reason for the severe vibration of the pipeline is due to the resonance caused by the similarity between the natural frequency of the pipeline machinery and the excitation frequency. Using the discrete element analysis software EDEM to explore the optimal vibration reduction scheme of particle dampers, it is found that when the filling rate is 50%, the structural energy consumption rate is the highest and the vibration reduction effect is the best. On site installation, a vibration reduction scheme with a particle size of 20 mm and a filling rate of 50% is selected, and then the vibration acceleration decreased from 185.84 m/s² to 50.549 m/s², with a maximum reduction of 72.80%, the average reduction in other positions is over 65%. The pipeline vibration is significantly suppressed, the safety of the compressor outlet pipeline is ensured.

Key words:

摘要：

某企业离心式压缩机出口管道振动剧烈，现场振动测量发现管道最大振动加速度高达185.84 m/s²,利用颗粒碰撞阻尼技术对出口管道进行了减振应用。对管道振动原因进行了分析，运用ANSYS有限元分析软件对管道模态分析，发现第2阶模态频率13.195 Hz与实测激振频率13 Hz几乎一致，得出管道剧烈振动原因是由于管道机械固有频率与激振频率相近，发生共振。运用EDEM离散元分析软件探究颗粒阻尼器最优减振方案，计算得出填充率选择50%时结构耗能速率最大，减振效果最好。选择粒径20 mm,填充率50%的减振方案，现场安装后，振动加速度从185.84 m/s²降至50.549 m/s²,最大降幅72.80%,其他位置平均降幅在65%以上，管道振动明显得到抑制，压缩机出口管道的安全得到保障。

关键词: 离心压缩机, 管道振动, 模态分析, 离散元仿真, 颗粒阻尼器, 流体脉动, 颗粒碰撞,