针对频率失调问题的挖掘机ANC系统优化设计  

Optimized Design of Excavator ANC Systems for Frequency Mismatch

作　　者：袁守利[1,2] 陈际 刘志恩[1,2] 吴方博 YUAN Shouli;CHEN Ji;LIU Zhien;WU Fangbo(School of Automotive Engineering,Wuhan University of Technology,Wuhan Hubei 430070,China;Hubei Provincial Key Laboratory of Modern Auto Parts Technology,Wuhan University of Technology,Wuhan Hubei 430070,China)

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]武汉理工大学现代汽车零部件技术湖北省重点实验室,湖北武汉430070

出　　处：《传感技术学报》2024年第9期1563-1570,共8页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(52175111)。

摘　　要：在进行窄带主动噪声控制(Narrowband Active Noise Control,NANC)过程中,常采用非声学传感器来获取参考信号,但非声学传感器会因老化和疲劳积累产生误差,使NANC系统频率失调(Frequency Mismatch,FM),导致降噪性能下降,甚至失效。针对此问题,提出一种基于自适应补偿(Adaptive Compensation,AC)的控制方案,该方案利用滤波增强信号与原始信号的相关性,设计一个频率跟踪质量评价因子,使该方案能更精准地实现对频率的追踪,以取得更优的FM补偿效果。通过仿真对比发现,与传统解决方案相比,AC方案能应对更大FM,使NANC系统具有更好的稳定性,初步验证了算法的优越性。进一步开展台架试验与实机实验,试验结果表明:当FM达到10%,经AC方案优化的NANC系统对挖掘机2、4、6阶噪声降噪量仍达到了15.2 dB、24.1 dB、21.2 dB,进一步验证了AC方案的性能。同时,也表明所提AC方案能有效实现对FM的控制,具有较高的实用价值。In narrowband active noise control(NANC),non-acoustic sensors are often used to obtain reference signals,but non-acoustic sensors can cause errors due to aging and fatigue accumulation,resulting in frequency mismatch(FM)in the NANC system,leading to reduced noise reduction performance.To address this problem,an adaptive compensation(AC)based control scheme is proposed,which uses filtering to enhance the correlation between the fittering enhanced signal and the original signal,and a frequency tracking quality evaluation factor is designed,so that the scheme can achieve more accurate tracking of frequency to achieve better FM compensation results.Through simulation comparison,it is found that the AC scheme can cope with larger FM compared to the conventional solution,giving the NANC system better stability and initially verifying the superiority of the algorithm.Further bench tests and real machine tests are carried out,and the test results show that when the FM reached 10%,the NANC system optimised by the AC solution still achievs 15.2 dB,24.1 dB and 21.2 dB noise reduction for the 2nd,4th and 6th order of the excavator,further verifying the performance of the solution.It also shows that the scheme can effectively achieve the control of FM and has high practical value.

关 键 词：窄带主动噪声控制 频率失调 延时陷波算法 最速下降法 非声学传感器 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TB535[自动化与计算机技术—控制科学与工程]