To describe the dynamic responses of a vehicle model to random excitations generated by the vertical road irregularity, analytical formulae have been derived. The effects of road excitation frequency and road roughness, which are associated with ride comfort, road holding, and noise and harshness of a vehicle, were studied. To find the best compromise for the trade-off between these effects, an optimisation technique using sequential quadratic programming based on the derivation of simultaneous nonlinear equations was developed. A modified skyhook control, with two independent variables to be specified, is designed and tuned to precisely achieve the type of desired response. The simulation result showed that a semi-active suspension system with the proposed control strategy improved ride comfort, road holding, and noise and harshness significantly, compared with the conventional passive suspension systems as well with semi-active suspension for static optimal damping coefficients. However, when the vehicle went on a rough road characterised by an excitation frequency range of greater than 4 Hz, the optimal damping coefficients could not be obtained with respect to the rattle space and the tyre deflection constraints. One of the main advantages of the proposed control strategy is that it can be adapted to various roads, excitation frequencies, and vehicle speeds. An interesting issue in future work is the application of the developed control strategy to a full-car model which includes pitch, yaw, and roll motions.
Road-frequency based optimisation of damping coefficients for semi-active suspension systems
Straßenwelligkeit-basierte Optimierung der Dämpfungskonstanten für halbaktive Federungssysteme
International Journal of Vehicle Design ; 63 , 1 ; 84-101
2013
18 Seiten, 6 Bilder, 4 Tabellen, 38 Quellen
Article (Journal)
English
Anwendung im Fahrzeugbau , Pkw (Personenkraftwagen) , dynamisches Verhalten , Skyhook-Regelung , aktive Federung , Dämpfungskonstante , Schwingungsverhalten , Regelungsstrategie , Frequenzbereich , Anregungsspektrum , Schwingungsfrequenz , Fahrzeugschwingung , Fahrbahnunebenheit , Fahrzeuggeräusch , Fahrkomfort , Optimierungsverfahren , Rechnersimulation
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