This technology generates a linear torsional model of a manual transmission rotating system and a nonlinear multi-stage clutch damper model incorporating hysteresis and gear backlash under wide-open throttle conditions. It then uses these models to analyze gear rattle phenomena in single-mass and dual-mass flywheel systems based on clutch damper characteristics.
Gear-train rotating systems, such as transmissions and large engines, experience vibration impacts due to clearance-type nonlinearities arising from gear backlash and multi-stage clutch characteristics, which degrade vehicle sound quality. Experimental countermeasures are costly and time-consuming, and there has been a lack of systematic simulation methods to analyze gear rattle from various perspectives across different input torque profiles and operating conditions.
This technology reduces a 14-degree-of-freedom model to a 6-degree-of-freedom model based on eigenvalues and frequency response functions, confirming the alignment of dynamic characteristics to finalize the linear model. It simulates vibration impacts using a mathematical model of clutch torque based on stiffness, hysteresis, and relative displacement. Reducing degrees of freedom maintains analytical accuracy while decreasing computation time for high-DOF nonlinear models. Applicable to powertrain NVH design and clutch damper/flywheel specification selection for vehicle and transmission manufacturers, it reduces prototype testing and enables the development of low-rattle drivetrain designs at an early stage.
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