Optimierung der dynamik einer CVT-kette

The improvement of the dynamics of a CVT is an important task when designing a CVT-chain. In this contribution an optimisation is carried out using a powerful optimisation algorithm. A detailed dynamical model of the gear represents all effects which are necessary for quantifying the optimisation objective. By referring to a certain application the potential of this approach is illustrated which is also convenient for other optimisation tasks in propulsion technology: the noise emission of the CVT has to be minimised by determining an optimal rocker pin geometry of the chain. For this purpose a detailed dynamical model of the CVT is introduced which includes an exact treatment of the rocker pin kinematics of the chain. The geometry of the rocker pin joints is defined by the optimisation parameters p. A good choice for a measure f of the noise emission are the amplitudes of the forces in the bearings in a certain frequency domain. They are used to form the target function. A numerical simulation provides a mapping p → f (p) between the optimisation parameters and the objective function, which is not given analytically and takes high simulation effort. Therefore the optimisation algorithm implicit filtering is applied to solve the optimisation problem. The quite easy use of the method and its robustness are important advantages for industrial application. The noise emission of the CVT can be significantly reduced with the suggested approach.