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Abstract: The principle and method of calculation for the coupled torsional-axial vibration based on Rayleigh
differential method of crankshaft for a high speed diesel engine are presented. The internal combustion engine crankshaft is simplified to a continuous stepped shaft model and the kinetic formulas of shafts and masses are constructed. By means of the Lagrange formulation, the motion equation of torsional vibration and axial vibration are deduced. According to coupling principle and excited force of shafting system, a model of coupled tor-sional-axial forced vibration can be constructed. Using a vector matrix, a single order or a whole system vibration can be analyzed. With a newly designed testing set-up, the axial and tor-sional vibrations of the crankshaft at the free-end of a 4-cylinder diesel engine are measured. Compared with the practical measurement results, the calculated results are to be in agreement in main order.
Key words: ICE(Internal combustion engine) Crankshaft
Rayleigh differential Vibration
CLC No: TH166
Received 20051027, received in revised form 20051207 |