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Abstract
This review will focus on the necessity for developing seat vibration control systems as a part of manufacturers&rsquo investigation into finding innovative methods to increase the comfort and safety of the vehicles&rsquo drivers. Operators of either on-road or off-road vehicles are regularly subjected to an extended variety of various vibration levels, especially at low frequencies. Considering that exposure to such vibration in long term has some damaging effects on driver&rsquos health, many comprehensive investigations have been carried out and researchers have proposed several measures for estimating discomfort and the suitability of various vehicles&rsquo seats such as those of trucks, cars and agricultural vehicles in operating condition. Active, passive and semi-active suspension systems are employed in vehicle seats to alleviate the harmful and damaging effects due to the transmitted vibration to the human body. In order to improve riding comfort, the operator&rsquos body displacement and acceleration must be reduced. According to the research, active suspension control systems are the best choice to reduce the transmitted vibration to the drivers&rsquo body and provide the best ride comfort in comparison with passive and semi-active systems.