The Noise, Vibration and Harshness (NVH) behaviour of the powertrain, the driveline and the mounting is playing a very important role in the vehicle development process. The method described in this paper presents the coupling of Multi Body Simulation (MBS) with mathematical optimization tools exemplary for a powertrain mounting at a passenger car vehicle.
It is shown, how this approach is integrated in the IAV - development process for validation and for optimization, i.e. finding the best solution for reaching the NVH targets. In early stage of development process, torsional vibration models are used to simulate e.g. the decoupling between engine and transmission. To simulate further physical effects, the models must be more and more detailed with a lot of additional parameter. One challenge for valid models is the parameter identification.
The process to do this successfully with mathematical methods will be described. After validation of the basic model the optimization procedure will start. To reach the defined NVH targets, e.g. mounting acceleration or sound pressure in the passenger compartment, a sensitivity analysis is done. Based on this the influence of several parameters to the targets is investigated.
Results are many best possible parameter solutions w.r.t. other restriction, e.g. manufacturing and costs, the optimum of parameter values is detected.