Comparability of dynamic chassis measurements with full vehicle tests using the example of a sports car

Abstract

on ride comfort. Therefore the differences between measurements of full car tests with the results from traditional 4-post test rigs and finally with the dynamic suspension test rig up to a frequency around 30 Hz are analysed. For this research a standardized driving surface and bump is used for the full car test. On the 4-post and dynamic suspension test rig the dynamic transmission behaviour is inspected with a sinus sweep with constant amplitude and frequency velocity and a vertical bump. The study shows that the results of all three measurement methods used for the subsystem suspension are comparable. Further a multi body simulation (mbs) is validated with the measurements. The results of the simulation are nearly the same compared to the real tested measurements. Furthermore this study investigates a method to analyse the maximum and minimum eigenfrequency of a suspension. Another eigenfrequency within the suspension is possible with a stiff damper stiffness and is affected by the wheel trajectory angle and the longitudinal elasticity of a suspension. This eigenfrequency can be affected by the damper position. Furthermore all three parameters influence each other. This reciprocal dependency is also investigated of accelerations on the chassis dome, wheel carrier and seat by driving over a bump. With this study it is possible to increase the spread of best-in-class handling performance and optimal ride comfort.