Experimental Study on Active Noise Control by Controllable Thin-plate Vibration as Secondary Sound Source
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摘要: 提出应用于有源噪声控制的改良自适应滤波算法，然后搭建管道噪声有源控制实验装置，并分别以可控式薄板振动和扬声器作为次级声源进行管道有源噪声控制实验研究。结果表明：在低频段时，以可控式薄板振动为次级声源的有源噪声控制效果小于传统的扬声器，但在中、高频时降噪效果较为明显；在1 200 Hz以后管道截止频率之前，次级声源为平板时，控制前后管道下游的衰减量可达50 dB，相较于传统的次级声源扬声器高出了约10 dB。在管道有源消声中，由于平板声源具有较好的指向性，因此可从管道噪声主动控制扩展到空间噪声主动控制，以此来弥补平板在低频声辐射能力不足的缺点。Abstract: An improved adaptive filtering algorithm for active noise control (ANC) is proposed, and the experimental device for ANC of duct noise is set up, in which the controllable thin-plate vibration and loudspeaker are as secondary sound sources, respectively. The results show that:in the low frequency band, the active noise control effect with controllable thin-plate vibration as the secondary sound source is less than that of the traditional loudspeaker, but the noise reduction effect of controllable thin-plate vibration as the secondary sound source is much better in the middle and high frequency. From 1 200 Hz to the cut-off frequency of the duct, the attenuation of the downstream of duct with thin-plate vibration as the secondary sound source before and after controlled, is up to 50 dB, it is about 10 dB higher than the traditional secondary loudspeaker. In duct active noise elimination, the low frequency noise is mainly eliminated, however, due to the good directivity of the plate sound source, it can be extended from the active control of the duct noise to the active control of the space noise, in order to make up the shortcoming of the insufficient sound radiation ability of the plate in the low frequency band.
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表 1 3种方法的参数设定
名称 FXLMS Akhtar 改良算法 收敛因子 μ=0.001 μ=0.001
μmax=0.04
μmin=0.0007μmax=0.001
μmin=0.0007自适应滤波器长度的采样点数量/个 32 32 32 次级通道滤波器估测长度的采样点数量/个 50 50 50 
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