Delft University of Technology
Faculty Mechanical, Maritime and Materials Engineering Transport Technology
W.S. Verkerk Entwicklungsprozess zur methodischen Integration und Überprüfung der Funktionalität eines Dämpferreglers in ein Mehrkörper Gesamtfahrzeugmodell.
Masters thesis, Report 2004.VT.6906, Transport Engineering and Logistics / Vehicle Engineering.
To shorten development times, to carry out practical tests more purposeful and to be able to predict the system's behaviour, simulation plays an important role in the modern vehicle engineering. Also, more and more modern vehicles are equipped with a semi-active chassis. Theoretical considerations show a significant improvement of the performances of a vehicle chassis over a wide frequency range by using semi-active wheel suspensions. Therefore, it is desired to carry out simulations to investigate and to evaluate the influence of variable damping on the vehicle's driving behaviour. For this purpose, a damper controller will be implemented in a complex multi body model of a full vehicle. The used damper controller will be discussed in detail. After that, the complete process of integration of the damper controller in the multi body simulation model will be discussed.
To execute this process, a Matlab/Simulink model of a damper controller is used. This is a model of the damper controller implemented in the ECU of the vehicle. This process is set up as follows. First, this Simulinkmodel is implemented in a simple Simulink vehicle model, in order to perform a model check. When the simulation results seem to be plausible, the damper controller is implemented in the single-component testrig of ADAMS/Ride. Then can be checked, that the responses of the controller to uniform input signals in Matlab and ADAMS are the same. When this is the case, assured can be that the controller is well implemented in ADAMS. Because complex simulation models are considered, the implementation process is set up in this way. Possible irregularities can be discovered as quickly as possible. The cause of these irregularities can be detected purposefully.
The results of the simulations carried out show that variable damping has a positive influence on the comfort of the vehicle. The magnitude of the tyre load variation in the range of the eigenfrequency of the tire (10 - 12 Hz) could to be decreased by the controller. The analysis of the step steer manoeuvre shows no significant influence of variable damping on the handling of an Audi A6.
Reports on Transport Engineering and Logistics (in Dutch) Reports on Vehicle Engineering (in Dutch)
