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《Diesel Engine》 2019-06
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Analysis on the Composite Stress Control for Torsional Vibration of a Diesel Engine Crankshaft

Xu Congcong;Liu Kai;Jiao Yafei;Liu Dajiang;Zhou Guoqiang;Shanghai Marine Diesel Engine Research Institute;Changjiang Shipping Science Research Institute;CCS Wuhan Rules & Research Institute;  
To deal with the excessive torsional vibration excitation force in the torsional vibration calculation of a new type of diesel engine, the excitation was analyzed and torsional vibration calculation was carried out. To reduce excessive torsional vibration compound stress, different methods were tried. The following conclusions were obtained. The diesel engine strengthening index has been improved continuously, but the amplitude of the gas excitation harmonic component recommended by CCS is relatively small. From the perspective of safety, the calculation of torsional vibration should be calculated according to excitation data provided by diesel engine manufacturers. The excessive vibration stress in resonance region can be reduced by determining the harmonic component of the main contributer and adjusting the component's parameters of the node position. Excessive vibration in the non-resonant region is normal vibration response, which can be adapted by enhancing the torsional vibration fatigue strength of the crankshaft, but the feasibility of the diesel engine design should be considered comprehensively.
【CateGory Index】: TK422
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