The purpose of the design of active suspensions for road vehicles is that of optimizing the performances of the vehicle with regard to comfort, road holding, and rideability. The results of simulation show an acceptable loss in performance when the passive suspesnion is compared with the active one. Optimal design of an active suspension system for road vehicles can be solved using LQR techniques. Such a problem is equivalent in the frequency domain, to determine the state feedback gain matrix that minimizes the H2 norm of a suitable transfer matrix. A passive suspension system can be seen as the physical realization of a suitable state feedback law whose gains are function of the system parameters. This law, and thus the characteristic elements of the passive suspension, can be determined as an approximation of the H2 optimal solution. This design leads to passive suspensions with the following properties: (i) If the external disturbances can be represented as white noise with covariance matrix I delta(tau), then the root mean square value of the power associated to a dummy output, chosen to characterize the disturbance effect, will be minimized with respect to any other passive suspension. (ii) The passive suspension does not enjoy the fundamental property of optimal control, namely that of minimizing the chosen performance index for any arbitrary initial state x(sub 0). However, it has good performances for different types of disturbances, such as those corresponding to irregularities of the road or corresponding to forces acting on the suspended mass. This methodology allows one to choose the best controller form a constrained subset (i.e., all possible passive suspensions of a particular form) of all possible controllers.
An H2 formulation for the design of a passive vibration-isolation system for cars
Eine H2-Formulierung zur Auslegung von passiven Schwingungsisolationssystemen für Autos
Vehicle System Dynamics ; 26 , 5 ; 381-393
1996
13 Seiten, 9 Bilder, 6 Quellen
Article (Journal)
English
An H2 Formulation for the Design of a Passive Vibration-Isolation System for Cars
Taylor & Francis Verlag | 1996
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