Abstract
Suspension plays an important role as a first gate to exterior environment. Especially suspension deals with vibration suppression and handling. But the conventional suspension cannot achieve those two simultaneously. Therefore it necessiates a demand on the several kinds of electronic controlled suspensions. Semi-active suspension has several advantages over the active suspension like low-cost, low weight and easy maintenance. But it also has some disadvantages like being unable to do attitude control and small control range. To overcome disadvantages, new type of semi-active suspension is proposed which has two actuators, variable damper and variable air-spring. And an algorithm is presented which can synthesize and coordinate two actuators. To verify the effectiveness of the proposed system, simulations and tests have been conducted.