Severe vibration was observed at a scrubber system connected to a reciprocating compressor during commissioning stage. Field measurements including vibration, pressure pulsation, and modal experiment were conducted to determine the causes of vibration, which showed that the excessive vibration was caused by pressure pulsation-induced mechanical resonance. Vibration reduction treatment for mechanical resonance avoidance via the installation of support on scrubber was proposed and then validated by resonance analysis and one-way fluid structure interaction (FSI) analysis. Resonance analysis showed both the dominant frequencies of pressure pulsation and rotational frequencies of compressor were beyond resonance regions, and FSI analysis indicated that the vibration levels of the scrubber system at its design conditions were within the allowable limit. Installation of two braces with a band clamp on the scrubber was implemented. The effectiveness of the treatment was verified by comparison of measured data before and after scrubber modification; the peak amplitudes occurring at the dominant excitation frequencies in both vibration and pulsation spectra declined greatly after modification, which guaranteed the long-term stable operation of the scrubber.

中文翻译：

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连接到往复式压缩机的洗涤塔系统的振动诊断和处理

在调试阶段，在连接到往复式压缩机的洗涤塔系统中观察到严重振动。进行了包括振动，压力脉动和模态实验在内的现场测量，以确定振动的原因，结果表明，过度振动是由压力脉动引起的机械共振引起的。提出了通过在洗涤塔上安装支撑件来避免机械共振的减振方法，然后通过共振分析和单向流体结构相互作用（FSI）分析进行了验证。共振分析表明，压力脉动的主导频率和压缩机的旋转频率均超出共振区域，而FSI分析表明，洗涤器系统在其设计条件下的振动水平在允许的范围内。在洗涤器上安装了两个带夹的支架。通过比较洗涤塔改造前后的测量数据，验证了该处理的有效性。修改后，振动谱和脉动谱中主要激发频率处出现的峰值幅度大大降低，从而保证了洗涤塔的长期稳定运行。