Recently, very attractive and effective semi-active suspension featuring electro-rheological fluid dampers (ER dampers) has been proposed by many investigators for vibration control of a vehicle system. As evident from these previous studies, ER dampers proposed so far are cylindrical types consisting of a flow duct between inner and outer electrodes. This type of ER damper has a simple mechanism and hence one can easily analyze field-dependent damping forces. However, in order to achieve an acceptable damping force required for a passenger vehicle an advanced ER fluid, which has relatively high-field-dependent yield stress (about 2.5 kPa at 5 kV/mm), needs to be used for the cylindrical ER damper. Currently, there exist a couple of commercially available ER fluids, which can produce the demanded damping forces. But, those ER fluids are very expensive. Consequently, it is necessary to devise a new type of ER damper whose damping force is much less sensitive to the yield stress of ER fluid. This work presents a novel type of ER damper and applies it to a semi-active suspension of a passenger vehicle in order to achieve effective vibration control. The proposed ER damper has flow orifices controlled by the intensity of electric field as well as piston motion (orifice-type ER damper in short). Thus, the damping force of the proposed ER damper is less sensitive to the field-dependent yield stress of ER fluid than that of a cylindrical ER damper. After manufacturing the orifice type of ER damper on the basis of a theoretical model, field-dependent damping forces are evaluated. The proposed ER damper is then incorporated with a full-car model in order to evaluate suspension performance. Vibration control responses of the semi-active suspension system under bump and random road profiles are investigated by employing an optimal controller.
Vibration control of semi-active suspension featuring electrorheological fluid dampers
Die elektrorheologischen Fluiddämpfern ähnlichen Schwingungsdämpfungseigenschaften einer semi-aktiven Suspension
Journal of Sound and Vibration ; 234 , 3 ; 537-546
2000
10 Seiten, 7 Bilder, 5 Quellen
Article (Journal)
English
Schwingungsdämpfung , elektrorheologische Flüssigkeit , Suspension , Flüssigkeitsdämpfer , konstruktiver Aufbau , Elektrode , Dämpfungsmaß , Fließspannung , Pkw (Personenkraftwagen) , Loch (Öffnung) , elektrisches Feld , Kolben (Maschinenelement) , analytische Untersuchung , Rechenmodell , Dämpfungskraft
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