Research On The Dynamic Characteristics Of Crankshaft For Large-Scale Reciprocating Compressor

Large reciprocating compressor is the core equipment of the petroleum, the chemical industry used as gas compression. Its complex structure, multiple components, bad operating conditions and unnormal component failure will pose a great hidden danger to normal machine operating and enterprise safety production, bringing some serious economic loss. Crankshaft is the key part of the reciprocating compressor, in the process of unit operation it is under alternating load varies with time periodically. The vibration, produced by the crankshaft rotation in high speed, plays an important role in causing compressor unit resonance. The shafting dynamic characteristics will not only affect the service life of the crankshaft, and directly be related to the security and stability of the unit, and will also have a greatly negative impact on other parts’life and performance.First of all, based on consulting a large number of domestic and foreign literature information, we take the large reciprocating compressor as the research object to do the dynamics analysis and statics analysis of the shafting movement, and then gain some understanding of the crankshaft moving characteristics and stress distribution, which provides the basis for its dynamic characteristic analysis.Secondly, combined with the dynamics analysis and statics analysis of the shafting movement, we use ADMAS software for crankshaft dynamics analysis, and then obtain each crank load in the weekly crankshaft movement, which provides the basis for its Instantaneous dynamics analysis.Finally, by use of Pro/E software to do3D entity modeling for compressor crankshaft, and through the Pro/E and ANSYS Workbench interface, the model will be into Workbench module in ANSYS, so as to establish the finite element model of the crankshaft. And by using the module in ANSYS, the crankshaft will be imposed on corresponding constraints according to the working condition of compressor, which will lay a foundation for design and improvement of crankshaft mechanism by use of the crankshaft modal analysis and transient dynamics analysis.Through the above research, we can get some useful conclusions and data that provide some reference for the optimization of reciprocating compressor crankshaft, which is certainly theoretical and practical.