有源声屏障中误差传感器的位置优化

Error sensoring optimization in active noise barrier system

有源声屏障利用有源控制系统提高声屏障低频段的降噪效果。有源控制系统中误差传感器的位置对整个系统的降噪效果有较大的影响。通过数值模拟和实验研究误差传感器的位置优化问题,得出了有源控制系统中误差传感器摆放位置的两条结论:(1)所介绍的三种摆放中,误差传感器的位置在次级声源的正上方时,有源控制系统在屏障后方声影区引入的新增插入损失最好,特别是对于距离屏障较远的区域;(2)当误差传感器的位置在次级声源的正上方时,误差传感器与次级声源间的距离存在一个最优距离使得屏障后方声影区的衍射声得到最好的降低。

Active noise barrier utilized active control system to increase the low-frequency effect of the barrier. The effect of active noise barrier was influenced by the locations of the error sensors. The optimization of the locations of the error sensors in the active noise barrier system was investigated. Two conclusions were obtained through numerical simulations and experiments： （1） When the error sensors＇ positions were above the secondary sources in three arrangements, the excess insertion losses in the “dark area” were greatest, especially when the observational points were far away from the barrier; （2） There was an optimized distance between the error errors and the secondary sources for achieving the greatest excess insertion loss in the “dark area”, when the positions were above the secondary sources.