A generalized multibody dynamic model for dual-clutch transmissions with wet clutchsets

A generalized multibody dynamic model enabling coupled vibration analysis of dual clutch transmissions (DCT) operating under any duty cycle is proposed. The model includes a new three-dimensional elastic continuum representation of wet clutchsets and predicts both steady state and transient response of DCTs. The coupled dynamic and thermal governing equations with localized, nonlinear multi-axis excitations acting on the clutch disk surface are solved. The nonlinear time-varying wet clutch dynamic model is benchmarked against experimental test results for its dynamic response and pad temperature distribution. Newmark's time-step marching-based integration is used to determine the time-varying dynamic response of a complete transmission system. For the corresponding linear time-invariant version of the model, natural modes are obtained by solving the eigenvalue problem. The proposed model is exercised using a common transmission architecture operating at several different operating conditions and clutch pad schemes. The resulting impact from non-torsional dynamic loads generated due to time-varying clutch pad friction, rotordynamics, gear dynamics, and clutch dynamics is investigated with a specific focus on axial and transverse rotodynamic displacements and bearing dynamic loads.