Wang Shuping, Sun Hongmei, Pan Jie, Qiu Xiaojun
Key Laboratory of Modern Acoustics and Institute of Acoustics, Nanjing University, Nanjing 210093, People's Republic of China.
School of Mechanical and Chemical Engineering, The University of Western Australia, Perth, Western Australia 6009, Australia.
J Acoust Soc Am. 2018 Aug;144(2):598. doi: 10.1121/1.5049145.
Near-field error sensing is beneficial to the compactness and stability of an active noise control system. This paper proposes an error sensing strategy based on the spatial Fourier transform to achieve active directivity control of radiated sound. The error microphone array is located on a plane close to the primary source and the cost function is the weighted sum of the error signals from the microphones. The weighting factor is related to the phase shift from the error microphones to the plane perpendicular to the direction where noise reduction is required. The geometric configurations of the error microphone array for effective directivity control are investigated. It is found that the distance between neighboring error microphones must be less than approximately half the wavelength of the frequency of interest and the equivalent size of the microphone array should be larger than twice the size of the primary source. Numerical simulations and experiments demonstrate the feasibility of the proposed strategy.
近场误差传感有利于有源噪声控制系统的紧凑性和稳定性。本文提出一种基于空间傅里叶变换的误差传感策略，以实现辐射声的有源指向性控制。误差传声器阵列位于靠近主声源的平面上，代价函数是来自传声器的误差信号的加权和。加权因子与从误差传声器到垂直于需要降噪方向的平面的相移有关。研究了用于有效指向性控制的误差传声器阵列的几何配置。发现相邻误差传声器之间的距离必须小于感兴趣频率波长的大约一半，并且传声器阵列的等效尺寸应大于主声源尺寸的两倍。数值模拟和实验证明了所提策略的可行性。
