Abstract
The paper will present the optimisation of reduction of torsional oscillations and noise of truck powertrains. For this purpose, a mathematical model was made that predicts the dynamic behaviours of parts of powertrains [1]. The simulation made with help of this mathematical model is compared with measured characteristics of an existing powertrain in operation. For this experiment powertrains of Czech manufacturer AVIA were chosen. With the use of the mathematical model two main stages of optimisation of powertrain can be achieved and will be described.
The first stage concerns the optimisation of behaviour of clutches. The model described above helps to make optimum choice of clutch.
The second stage is to minimise the oscillations of powertrain as much as possible. The use of dynamic absorbers for this purpose will be elaborated.
For use in automobiles, the classical concept of absorber (dependence of absorber of tuned frequency), must become more sophisticated: an actuator has to be inserted between primary and secondary mass. The paper will discuss active and semi-active dynamic absorber that are capable of damping a range of oscillation frequencies. The comparison between the behaviour of a system with one mass and multi-mass absorber will be shown. The simulation of linear and non-linear control of absorber will be presented.