Structure-borne noise generated by tire contact on road irregularities is a very important factor in interior vehicle noise. This kind of low-frequency noise can seriously affect the driver's concentration and passenger comfort. In order to reduce this vibration-induced noise, an active vibration control of the vehicle suspension is proposed, as opposed to acoustic noise control. Since modeling uncertainties are inevitable in characterizing the dynamics of the vibration transmission path, robust feedback controllers are considered. In this paper, an H-infinity robust controller and a my-synthesis robust controller are designed to reduce the vibrations using actuators acting directly on the suspension. First, closed-loop simulation results are obtained on a quarter-car suspension at the Universite de Sherbrooke, showing a significant reduction in vibration. Second, simulation of the controllers is conducted on a real car. Closed-loop test results are presented and the effectiveness of the robust feedback controllers is discussed. This work shows that Hinfinite and my-synthesis robust controllers can achieve an acceptable tradeoff between robustness and performance for vehicle suspension systems. However, more efforts are needed to make them work more effectively on an actual system. Disturbance and control signals are co-located in this paper, however, this is not realistic. A better setup is to use independent actuators for each suspension. In this case, new transmission paths from the actuator inputs to the output sensors should be modeled. Modeling and controller design for the car's three other suspension systems should be completed. Since the structure of the back suspensions is different from the front ones, based on our experience, more modeling work may be needed for them. Once the experimental car is finished setting up, further experiments can be done to check the effectiveness of the robust controllers on the real system.
Structure-borne noise reduction through active control of vehicle suspension
Reduzierung des Körperschalls durch aktive Regelung der Fahrzeugaufhängung
2009
10 Seiten, 7 Bilder, 5 Quellen
Conference paper
English
Active control of structure-borne noise
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