Nonlinear vibration of a dual mass flywheel considering the friction torque and clearance variation characteristics of the stiffness of damping spring

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (6) : 231-237.

ZENG Liping1, CHEN Qiping1,SONG Liquan2

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Abstract

For a circumferential short spring dual mass flywheel (DMF) with singlestage stiffness, there is a certain empty angle between the primary flywheel and secondary flywheel for machining and assembly reasons. When the flywheel turns across the empty angle,the shock between the elastic element and flywheel may occur. By introducing a friction bearing block into the DMF located between the primary flywheel and secondary flywheel, and loading an axial pretightening force to produce friction torque, the shock between the spring seats and secondary flywheel caused by the empty angle can be released. Considering the friction torque and the piecewise stiffness owing to the clearance of the damping spring in the DMF, the torsional vibration model of the vehicle powertrain system equipped with the DMF and the corresponding nonlinear differential equations were established.The average method was applied in the derivation of the approximate solution of the system nonlinear frequency characteristics, and the influence of the input harmonic incentive amplitude and DMF parameters on the system nonlinear characteristics was analyzed. The study provides a theoretical basis for establishing the dynamic characteristics analysis model of the DMF which is fairly close to actual state and improving the vibration reduction performance of the DMF.

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dual mass flywheel / friction torque / clearance / nonlinear vibration / average method

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ZENG Liping1, CHEN Qiping1,SONG Liquan2. Nonlinear vibration of a dual mass flywheel considering the friction torque and clearance variation characteristics of the stiffness of damping spring[J]. Journal of Vibration and Shock, 2018, 37(6): 231-237

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