往复压缩机轴系扭振谐响应分析

HARMONIC ANALYSIS ON CRANKSHAFTS TORSIONAL RESONANCE OF RECIPROCATING COMPRESSOR

往复压缩机是石油化工行业关键的动力设备,轴系动力学特性直接影响压缩机机组运转的可靠性。以某6列往复压缩机为例,利用有限单元法对轴系进行模态和谐响应分析。结果表明:轴系存在弯曲、扭转以及弯扭组合等多种模态振型;扭转共振是轴系动力学特性主要表现形式;轴系扭转共振通常只考虑一阶扭转模态振型,二阶及以上扭转模态可忽略不计。该结论对大型往复压缩机研制及故障诊断有重要的指导作用。

Reciprocating compressor, as power equipment, plays a key role in petrochemical industry. Crankshaft＇ s dynamics characteristics affect not only the lifetime of crankshaft, but also safety and stability of compressor units. Based on 6M50 type reciprocating compressor, modal and Harmonic analysis of crankshafts are analyzed by Finite Element Method. The results obtained show that： Torsional resonance is only possible form of resonance, which can be clear that various kinds of bending and transverse modal don＇ t have to be considered; The 2nd and more order torsional resonance can be negligible, which provides theoretical foundation to analyze and study only on 1 st torsional natural frequency of large reciprocating compressors. These conclusions can provide some guidance to structure design and solving the default problem for reciprocating compressor.