Transient torsional vibration analysis of marine diesel engine under short-circuit impact
[Objectives]In order to formulate an optimization scheme for the torsional vibration parameters of a marine diesel generator shaft system,it is necessary to analyze the transient torsional vibration character-istics of the diesel generator under short-circuit impact.[Methods]The shafting transient torsional vibration characteristics of a 20-cylinder V-type diesel generator set under short-circuit impact are analyzed by the New-mark method,and the effects of different shafting parameters on its shafting transient torsional vibration char-acteristics under short-circuit conditions are discussed.A new selection scheme of shock absorber stiffness and coupling stiffness is then determined.[Results]The calculation results show that the shafting torsional vibra-tion characteristics deteriorate significantly when short-circuit impact occurs.After optimization(the stiffness of the torsional shock absorber and coupling are optimized to 90%and 70%of the original value respectively),the maximum transient torque of the motor shaft,maximum transient torque of the coupling and maximum transient stress of each segement of the crankshaft under short-circuit impact conditions are reduced by 13.43%,10.51%and 5.29%respectively.[Conclusions]The proposed optimized design scheme can effect-ively reduce the transient torsional vibration level of shaft systems.The results of this study can provide use-ful references for the vibration and noise reduction design of diesel generator sets.
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