Keywords: hydromounts, nonlinear modelling, physical modelling, amplitude dependence, full vehicle simulation, road excited vibrations, linear lumped parameter models, motorway driving, rough roads, model complexity, vehicle vibration, high amplitude oscillations
Effects of non-linear modelling of a hydromount in full vehicle simulation
The effects of different levels of model complexity for a hydromount in full vehicle simulation are investigated. In particular, the performances of the classical Kelvin-Voigt model, a standard linear lumped parameter (lever) model and an amplitude-dependent non-linear physical model with respect to their predictive capabilities are studied; thereby special attention is paid to the step from a linear to a non-linear model. The evaluation is based on comparisons with test results for crossing a single obstacle, driving on a motorway and on a rough road, respectively. Assessments in the time domain as well as by statistical means show that the non-linear model is capable of capturing high-amplitude oscillations more precisely, but that the overall differences between the simulation results are not very pronounced.