Passive suspension does not meet ride comfort and stability over a broad range of road disturbances due to constant damping coefficient. In semi-active suspension system, value of damping coefficient changes which depends on control strategy implemented. So, in semi-active suspension, ride comfort and vehicle stability can be achieved in a wide range of frequency. Design and development of control strategies are according to the application like for city driving, off-road riding, or track racing. There are various control strategies available such as skyhook, groundhook, hybrid, fuzzy, neural network, and H-infinity [1-3].
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