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Monday, July 8 • 16:50 - 17:10
NONLINEAR TORSIONAL VIBRATION ANALYSIS OF DIESEL ENGINE SSION SHAFT SYSTEM

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The diesel engine transmission shaft includes a thrust shaft, an intermediate shaft and a tail shaft. In order to connect the shafts as a whole for power transmission and reduce torsional impact, a flexible coupling is required. The flexible coupling is actually a non-linear element whose stiffness changes with the vibration frequency as the torque ripple changes. Since the stiffness has a great influence on the inherent characteristics of the transmission shafting system and the vibration reduction effect, the influence of the stiffness nonlinearity cannot be ignored. In this paper, the transmission shaft with flexible coupling is taken as the research object. The finite element method is used to establish the nonlinear dynamic model of the transmission shaft, and the nonlinear torsional vibration response under random excitation is solved and the influence of the flexible coupling characteristic parameters on the shafting response and stability is obtained. The results show that the linear stiffness of the flexible coupling can avoid the generation of "resonance"; the nonlinear stiffness can reduce the amplitude, preferably using the soft nonlinear stiffness; increasing the damping of the flexible coupling can also achieve the damping effect.

Moderators
EP

Elsa Piollet

Dr, Polytechnique Montréal
avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →
AR

Annie Ross

Professor, Polytechnique Montreal

Authors

Monday July 8, 2019 16:50 - 17:10 EDT
St-Laurent 8
  T07 Struct. dyn. & nonlin. vib., RS02 Vibr & cntrl of nonlin mech syst