Abstract
Electromagnetic active suspension system is considered to have improved stability and better dynamic response, compared to the hydraulic active suspension system. To investigate the influence of suspension parameters on system characteristics, the frequency response of quarter vehicle model is analyzed through Bode plots by varying the spring stiffness and damping coefficient. The sprung mass acceleration, suspension deflection and tire deflection are investigated respectively. This paper proposes a novel electromagnetic suspension system, comprising of a linear switched reluctance motor (LSRM) and a passive spring. The mechanical and electrical characteristics of the proposed linear motor are obtained and verified by using two-dimensional finite element method (FEM). The magnetic flux densities at specific translator positions are demonstrated. In order to study the feasibility and evaluate the performance of the proposed suspension system, a LQR optimal controller is developed and simulated with the quarter-vehicle model. The sprung mass acceleration, suspension deflection and related force applied by the actuator are investigated under different road disturbance. Both frequencies of disturbance are approximate to the suspension natural frequencies, which are the most severe working point of active suspension system. Simulation results demonstrate that good dynamic response and better ride comfort can be achieved by the proposed active suspension system.
Highlights
The fundamental purpose of ground vehicle suspension system is to maintain continuous contact between the wheels and road surface, and to isolate passengers or cargo from the vibration induced by the road irregularities
The hydraulic active suspension is modeled by a conventional passive suspension with an addition of active actuator between the sprung and unsprung masses [5], while in the electromagnetic active suspension system the passive damper is replaced by the active actuator
The transfer function from road vertical velocity to sprung mass acceleration, suspension deflection and tire deflection are: xs = kt s(bs s + ks )
Summary
The fundamental purpose of ground vehicle suspension system is to maintain continuous contact between the wheels and road surface, and to isolate passengers or cargo from the vibration induced by the road irregularities. These two purposes are responsible for the handling quality and ride comfort, respectively. Et al proposed a slot-less brushless tubular permanent magnetic actuator [3], and Bose Corporation applied a multi-phase alternating current (AC) electric motor in their suspension system. There is a big drawback in NdFeB magnet that it would lose magnetization around 150 °C In view of this situation, a novel configuration of linear switched reluctance motor (LSRM) is proposed in this paper.
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