The formalism proposed in this article has allowed us to establish an efficient 'hydromultibody' model of a modern car equipped with a novel suspension technology. Thanks to the symbolic approach underlying our multibody program and to the way the hydraulic components have been assembled at the equational level, the complete model is able to run in real time on a standard computer, in a user-friendly environment (Simulink in this case), suitable for the needs of our industrial partner. The modelling of the hydraulic subsystem has been achieved without resorting to intermediate 'fictitious' elements, by properly coupling the hydraulic components on the basis of their equational representation and of the constraints imposed by their assembling. The hydraulic model has been implemented in order to be applied to other configurations of the H2 Kinetic suspension system. Another key point of our modelling approach is to ensure a rigorous coupling between the hydraulic and multibody dynamic models at the same integration time step, leading to a purely ODE formulation for the global system (hydraulic and mechanical constraints being solved during the global reduction) and without resorting to co-simulation techniques which require additional numerical techniques to obtain accurate results. Moreover, the use of co-simulation packages (with Simulink for instance), although proposed by most of commercial multibody programs, was not envisaged by our industrial partner for both economy and efficiency purposes. After a model identification performed on four-poster test rig, the expected performances of the Kinetic H2 system are highlighted and quantified by simulation, in comparison with a car equipped with classical suspensions and anti-roll bars. Using, as input, the carbody corner vertical accelerations and the damper velocities, a controller can now be designed in Simulink using the present model, as it was recently done by Tenneco Automotive for the same car with four independent semi-active dampers equipped with the same electrovalves. As usual, the goal is to obtain a good compromise between comfort (human body accelerations) and handling (roll, curve entry, over/understeering, etc.) and at longer term, to contribute, via reliable models, to the subjective evaluation of a given suspension system, with respect to the above-mentioned criteria.
Multiphysics modelling of multibody systems: Application to car semi-active suspensions
Multiphysik-Modellieren von Mehrkörpersystemen: Anwendung bei aktiven Fahrzeugfederungen
Vehicle System Dynamics ; 48 , 12 ; 1439-1460
2010
22 Seiten, 19 Bilder, 18 Quellen
Article (Journal)
English
Multiphysics modelling of multibody systems: application to car semi-active suspensions
Taylor & Francis Verlag | 2010
|Multiphysics modelling of multibody systems: application to car semi-active suspensions
Automotive engineering | 2010
|Multiphysics modelling of multibody systems: application to car semi-active suspensions
Online Contents | 2010
|Springer Verlag | 2006
|Springer Verlag | 2019
|