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Active Road Noise Control
 
An active feedforward control system has been developed to reduce the road booming noise that has strong nonlinear characteristics. 4 acceleration transducers were attached to the suspension system to detect reference vibration and 4 loudspeakers were used to attenuate the noise near the headrests of 2 front seats and 2 rear seats. Multiple coherence analysis is applied to determine the reference sensor placement and filtered-X LMS Algorithm is used to control the road noises. During the test drive on the rough asphalt at a constant speed of 60 km/h, we were able to achieve a reduction of around 4~5dB of A-weighted sound pressure level in the road booming noise range.