A review of active noise and vibration control in road vehicles

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Description/Abstract

Active control works by destructive interference between the original sound or vibration field in
the vehicle and that generated by a controllable, secondary, source. Physical limitations
generally confine its usefulness to low frequencies and so that it complements conventional
passive control methods. The development of powerful processors at an affordable cost and the
increasing trend towards integration in vehicles has allowed the commercial implementation of
active control systems by several manufacturers, mainly for the reduction of low frequency
engine noise. As vehicles become lighter to achieve fuel efficiency targets, it is expected that
active control will play an important part in maintaining an acceptable NVH environment, in
terms of sound quality as well as overall level.