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Published in:
2020 | OriginalPaper | Chapter
Model-Based Estimation of Damper Excitations and Velocities Due to Road Surface Irregularities with Focus on Ride Comfort
Authors : David Benz, Peter E. Pfeffer
Published in: Advances in Dynamics of Vehicles on Roads and Tracks
Publisher: Springer International Publishing
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Abstract
In this paper a model-based method for estimating the damper excitations and velocity amplitudes by means of synthetic road irregularities are shown. They are based on a stationary white noise process with power density 1. With two 1st order filters it is possible to generate realistic synthetic road irregularities which are limited to an adequate magnitude level for both, small frequencies and higher frequencies.
To estimate the damper excitations and velocity amplitudes two methods are presented. The first method is based on the standard deviation method, which takes the appearance probability of 99.7% of simulated damper excitations and velocity amplitudes into account. The main disadvantage of these method, no information of the amount of amplitudes can be extracted, can be overcome with the second method. It is based on the relative frequency of the damper excitations and velocity amplitudes.
Three different synthetic roads based on the road types highway, main road and urban road, with an equivalent road surface quality index are generated. With a quarter vehicle model, which consists of a nonlinear so called VDA-characteristic simulations are presented to estimate the damper excitations and velocity amplitudes by means of the two described methods.