Error sensor location optimization for active soft edge noise barrier

Active control is used to improve the performance of noise barrier at low-frequency range and the excess insertion loss due to the active control system is influenced by the positions of the error sensors. The positional optimization for the error sensors in an active soft edge noise barrier was investigated. Both numerical simulations and experiments show that there is an optimum in the distance between the secondary sources and the error sensors, and that the error sensors should be placed above the secondary sources.