Department of Physics and Astronomy, N283 ESC, Brigham Young University, Provo, Utah 84602, USA.
J Acoust Soc Am. 2010 Feb;127(2):EL66-72. doi: 10.1121/1.3272632.
Recent experiments in active noise control (ANC) have used near-field error sensors whose locations are determined according to the minimization of sound power. Sensors should be placed in regions where the sound pressure reductions are the greatest during sound power minimization of the ANC system. Near-field pressure measurements of noise sources with and without ANC were made. With the error sensors in theoretically ideal locations, the measured near-field pressure map approximates the theoretical map created under the condition of minimized radiated power. Moving the error sensors to theoretically nonideal locations greatly reduces the attenuation of radiated sound power.
最近的有源噪声控制（ANC）实验使用了近场误差传感器，其位置是根据声功率最小化来确定的。传感器应放置在 ANC 系统声功率最小时声压降低最大的区域。对有和没有 ANC 的噪声源进行了近场压力测量。在理论上理想的位置放置误差传感器时，测量的近场压力图近似于在辐射功率最小化条件下创建的理论图。将误差传感器移动到理论上不理想的位置会大大降低辐射声功率的衰减。
