Current vehicle suspension systems cannot solve satisfactory the vehicles oscillations problem or they are very expensive and complex. One possible solution to solve these difficulties is to use elctromagnetic actuators in order to improve the performance of suspension system without increasing the energy consumption and the costs. A levitating suspension system using only an electromagnetic actuator between the sprung and the unsprung masses may be considered. However, in this situation the actuator must provide the entire force needed to support the sprung mass weight. This problem can be solved by a spring supporting the body weight, which allows for a significant reduction in terms of the actuator dimensions. Then, the actuator is controlled in order to compensate the spring deformation force, which results in a like-levitating behaviour. As the sprung mass really do not levitate due to the spring contact, the proposed system was called by Martins et al. as a pseudo-levitating suspension system. In this paper it was proposed, analysed, designed and evaluated a pseudo-levitating suspension system using an electromagnetic linear actuator and working under an adaptive on-the-road-disturbance main-frequency control law. It was also analysed the feasibility of a disturbance observer. From simulation, it is concluded that there is an improvement in passengers comfort when comparing the behaviour of the proposed system and the active suspension used as reference. Improvements are clear when results are compared to the standards of tolerance of the human body to the vibration. The proposed system works in the acceptable range in almost all the frequency values, although a rough variation near the resonance frequency value of the unsprung mass is verified.
Automobile suspensions using electromagnetic linear actuators
Aktives Fahrwerk mit elektromagnetischen Linearaktuatoren
2000
8 Seiten, 13 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
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