The Dynamic Characteristic Analysis of the Reciprocating Compressor's Crankshaft

The reciprocating compressor's crankshaft dynamic characteristic was studied by FEA and MSS. The analysis model of dynamics of compressor crankshaft was developed. The mode analysis was preceded,and then the first 8 steps natural frequency and modal shape of the crankshaft under free and operated conditions were studied. Displacements and stresses distribution,stress changing pattern with time of the crankshaft were obtained through calculating dynamic response of the crankshaft. The analysis results show that the finite element model of the crankshaft reflects dynamic characteristics of crankshaft of the actual structure,and each order natural frequency of the crankshaft is much higher than the operating frequency,so the possibility of crankshaft resonance is small,with high structural strength reliability of crankshaft. The reliability of structure strength of crankshaft is higher. The research results can provide theoretical basis for the structure optimization of the crankshaft.