Abstract
Flexible coupling is one of the crucial components for vibration attenuation used in vehicle power train. Vibration attenuation characteristics and stiffness identification of flexible coupling are profoundly studied aiming at one vehicle power train. Firstly, the dynamics model of each crucial transmission component in power train is constructed. And the torsional vibration model of power train is established according to the concentrated mass method. The effects of coupling stiffness on vibration responses of power train are thoroughly analyzed based on system concentrated mass dynamics model. Secondly, the sensitivities of natural frequency and main forced vibration response parameters are calculated. The coupling stiffness is proved to be a sensitive parameter. Finally, taking the Geislinger coupling as an example, the damping and stiffness characteristics are acquired according to the parameter identification method based on the quantity of test data. The results provide the theory basis for the dynamics optimization of power train.
Highlights
E flexible coupling is one of the crucial vehicle components for system resonance frequency shift and vibration attenuation. e damping performances of flexible coupling for power train system were widely studied [12, 18, 19]. e stiffness and damping parameters of flexible coupling were identified by numerical simulation and test [20, 21]
E stiffness of the Geislinger coupling changes with the variation of the transmission angle. It is coupled with system dynamics characteristics. erefore, the parameter identification of flexible coupling is important for the dynamics analysis of vehicle power train
Aiming at a vehicle power train, torsional natural vibration model of the vehicle power train is constructed based on the concentrated mass method. e influences of coupling stiffness on vehicle power train dynamics behaviors are thoroughly analyzed. e sensitivity formulas of free and forced torsional vibrations are derived
Summary
A Geislinger coupling with internal oil injection, as shown in Figure 2, is simplified as a dual-inertia torsional dynamics model for the study of frequency shift and vibration attenuation in the powertrain. A Geislinger coupling with internal oil injection, as shown, is simplified as a dual-inertia torsional dynamics model for the study of frequency shift and vibration attenuation in the powertrain. E torsional stiffness kc and damping cc of the Geislinger coupling change with excitation frequency ω [24]. Cc κkc, ωG where ωG is the angular frequency of external excitation, ωc0 is the natural frequency of coupling, kcs is the static stiffness of coupling, and κ is the damping factor. E vibration responses vary with the angular frequency of external excitation. It shows that the coupling stiffness is associated with the torsional vibration responses. E damping depends on the working state of the internal oil-filled Geislinger coupling [24]. TKN where T0 is the stable working torque of coupling and TKN is the rated coupling torque
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