Crankshaft Torsional Vibration Analysis of Multi-cram Reciprocating Compressor with ANSYS

With the enlargement of scale of petro-chemistry,there is a growing trend that reciprocating compressor develops towards large scale and multi-crank.The natural frequency of crankshaft torsion decreases with the increasing amount of crank of compressor,which also extend the possibility of torsional vibration.General experience shows that it is necessary to analyze the crankshaft torsional vibration for 6M reciprocating compressor.Some new methods are utilized for the dynamics analysis of crankshaft in compressor with the development of FEM.By virtue of ANSYS,6M50 reciprocating compressor is discussed with the respect of static,mode and dynamic analysis.The results reveal that such analysis technology is capable of full-scale analyzing various dynamic characteristic of crankshaft and obtaining direct and precise stress distribution in different time and areas,which provide efficient theoretical support to the compressor design.