Abstract
To study the nonlinear dynamic characteristics of the dual-mass flywheel (DMF) under the conformal contact action between the friction damping ring and primary flywheel pressure plate, the contact action model is established and analyzed based on Winkler model. Through analysis and calculation, the contact deformation, contact pressure at different contact positions, and equivalent torsional contact stiffness are obtained. The nonlinear dynamic analysis model of three-degree-of-freedom (3DOF) which takes the conformal contact into account and two-degree-of-freedom (2DOF) without considering conformal contact is established. The approximate analytical solution of the nonlinear frequency characteristics of the system at steady state is derived. By comparing with the results obtained from numerical method, the theoretical analysis process is proved to be valid. And it is found that the overall amplitude and angular displacement transmissibility of the 3DOF model are smaller than the 2DOF model, especially at resonance frequency. The effects of the friction damping ring moment inertia, stiffness of DMF, and axial friction torque on the frequency characteristics of system and angular displacement transmissibility are analyzed. The forced vibration response analysis of the 3DOF model is conducted, through which the torsional angle variations of the primary flywheel, friction damping ring, and secondary flywheel with time are obtained. The results show that the amplitude of the secondary flywheel is much smaller than that of the primary flywheel, indicating that the DMF has prominent damping performance.
Highlights
Dual-mass flywheel (DMF), which was first proposed by companies represented by LuK, can efficiently reduce the torsional vibration and noise, relieve impact, realize the protection of engine and gearbox against overload, and enable the engine to operate at lower speeds to reduce fuel consumption [1,2,3,4]
To verify the validity of the solution process, the results are compared with the system steady-state response amplitude obtained by applying the fourth-order Runge–Kutta numerical method with fixed step. e steady-state frequency characteristics and angular displacement transmissibility of the three-degree-of-freedom (3DOF) model which takes conformal contact into account are compared with the two-degree-offreedom (2DOF) model without considering conformal contact. e effects of moment inertia ratio, DMF stiffness, and axial friction torque on the frequency characteristics of system dynamic response and angular displacement transmissibility are demonstrated
In order to study the nonlinear dynamic characteristics of the DMF under the conformal contact action between the friction damping ring and the primary flywheel pressure plate, a conformal contact analysis model based on the Winkler model is established. e contact deformation, contact pressure at different contact positions, and equivalent torsional contact stiffness are analyzed. en, two nonlinear dynamic analysis models of the DMF are established, and the averaging method is used to derive the approximate analytical solution of the nonlinear frequency characteristics of the system at steady state
Summary
Dual-mass flywheel (DMF), which was first proposed by companies represented by LuK, can efficiently reduce the torsional vibration and noise, relieve impact, realize the protection of engine and gearbox against overload, and enable the engine to operate at lower speeds to reduce fuel consumption [1,2,3,4]. Song et al [18] proposed the design theory of a two-stage piecewise variable stiffness DMF, and the torque characteristics and frequency characteristics are analyzed by theoretical study and experiments. Wang et al [19] investigate the kinetic parameters matching and designing method for a multistage torsional stiffness DMF based on torsional vibration control by using the numerical analysis methods and proved by tests on an actual vehicle. E present work is devoted to study the nonlinear dynamic characteristics of DMF with considering the conformal contact action between the friction damping ring and the primary flywheel pressure plate. E effects of moment inertia ratio, DMF stiffness, and axial friction torque on the frequency characteristics of system dynamic response and angular displacement transmissibility are demonstrated To verify the validity of the solution process, the results are compared with the system steady-state response amplitude obtained by applying the fourth-order Runge–Kutta numerical method with fixed step. e steady-state frequency characteristics and angular displacement transmissibility of the three-degree-of-freedom (3DOF) model which takes conformal contact into account are compared with the two-degree-offreedom (2DOF) model without considering conformal contact. e effects of moment inertia ratio, DMF stiffness, and axial friction torque on the frequency characteristics of system dynamic response and angular displacement transmissibility are demonstrated
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