Adaptive Active Control of Low Frequency Noise in a Duct   

管道低频噪声的自适应有源控制(英文)

作　　者：李传光[1] 李悟[1] 韩秀苓[1] 

机构地区：[1]北京理工大学自动控制系,北京100081

出　　处：《Journal of Beijing Institute of Technology》1999年第3期318-323,共6页北京理工大学学报（英文版）

基　　金：北京市自然科学基金

摘　　要：Aim To study a method realizing noise control for a physical model of progressive wave in a duct. Methods A mathematical model was constructed and a transfer function of the adaptive system for noise control was also worked out; moreover, the effects of some algorithms such as RLS,LMS and LSL on noise control were analyzed and compared. Results Without the feedback of sound, the mean noise reduce value(MNRV) of 27 5 dB for broadband noise from 0 to 500?Hz in frequency were achieved. When acoustic feedback took place and an air stream loudspeaker was used, the MNRV was only about 4 9?dB. But if the loudspeaker had a plain frequency feature, MNRV was improved by 10 2?dB. Conclusion The technique is applied to ruducing the noise from engines' exhausted gas pipes. It is, in principle, used for noise cancelling in a closed three dimensional space.目的　针对实际的具有行波的管道模型，研究一种降噪方案． 方法　通过建立数学模型和用来导出降噪的自适应系统的传递函数，对 Ｒ Ｌ Ｓ、 Ｌ Ｍ Ｓ 和 Ｌ Ｓ Ｌ 算法的效果进行分析和比较． 结果　不存在声反馈时，对０ － ５００ Ｈｚ 的宽带噪声可达到平均降噪量（ Ｍ Ｎ Ｒ Ｖ）２７５ ｄ Ｂ． 若存在声反馈并使用气流扬声器时， Ｍ Ｎ Ｒ Ｖ 只有近似４９ ｄ Ｂ． 当该扬声器具有平坦特性时， Ｍ Ｎ Ｒ Ｖ 可提高１０２ ｄ Ｂ． 结论　这项抵消技术可用于对排气管降噪． 原则上，它亦可用于三维封闭空间的降噪问题．

关 键 词：noise control ADAPTIVE mean noise reduce value(MNRV) 

分 类 号：TP273.2[自动化与计算机技术—检测技术与自动化装置]