Analysis For400Four-throw Crankshaft

The developing new technology of compressor manufacturing is gradually meetingthe targets for low energy consumption, low emissions, and low noise. At the same timethe structure reliability design and vibration control of the compressor are put forwardhigher request. Along with this trend, the torsional vibration problems of the internalcombustion engine shafting shows up gradually. The crankshaft is one of the mostimportant parts of the compressor. And it is the most complicated mechanicalcomponent to affect the reliability of the compressor and the service life. With thedevelopment of the compressor technology, the increasingly harsh working conditionshave strict requirement for the strength of the crankshaft. In this context, further perfecttorsional vibration theory and new solution of torsional vibration are imperative. Thispaper summarizes some predecessors’ the methods about calculation of shaft torsionalvibration. Based on finite element, complex shafting torsional vibration is calculatedand analyzed by using the method of system matrix. Unit shafting torsional vibrationcharacteristics of the dynamic response and steady-state are acquired. In this paper, themain work include several aspects such as the three-dimensional modeling ofcompressor shaft system, shafting natural frequency analysis, force analysis of the staticand dynamic strength under the simple harmonic, shafting steady dynamic vibrationcharacteristic analysis and structure optimization and so on to. As follows:(1) The4M80compressors of YuanDa Compressor Company are the researchobject in this paper. Firstly, make modeling and assembly of parts by using thethree-dimensional modeling software ProE. Then import the three-dimensional model tosoftware ANSYS WORKBENCH and apply boundary conditions to the correspondingstatic structure analysis, modal analysis, etc.(2) Analyze the inherent frequency and principal mode of the compressorcrankshaft system model. Analyze the disturbing force generated from incentive load onthe crank-gas forces and inertia force, and calculate forced vibration of shaft system toobtain dynamic vibration of shaft system.(3) According to the dynamic vibration of shaft system steady state characteristics, combined with the strength of materials comprehensively to assess the reliability of thewhole shafting, and vibration absorber vibration reduction measures are taken to avoidthe vibration of shaft system problem.By the above work and its results, the actual situation of the compression shafttorsional vibration can be analyze and predicted. And by using the ANSYSWORKBENCH software, various working conditions can be conveniently simulated.This method is very suitable for engineering research and development of compressor.