汽车多通道多频点自适应降噪方法研究  

Research on Multi-Channel Multi-Frequency Adaptive Denoise Method of Vehicle

作　　者：吴从兵[1] WU Cong-bing(West Anhui University,Anhui Liuan 237012,China)

机构地区：[1]皖西学院

出　　处：《机械设计与制造》2019年第12期220-224,共5页Machinery Design & Manufacture

基　　金：2016年安徽省高校优秀青年人才支持计划重点项目(gxyqZD2016247)

摘　　要：为了降低汽车驾驶室噪声、营造良好的驾驶和乘坐环境,提出了多通道多频点自适应降噪方法。分析了驾驶室噪声特征,建立了噪声频率与发动机转速关系模型;分析了单通道噪声主动控制方法,提出了自适应步长LMS算法,使收敛因子随噪声误差自适应变化,兼顾了算法收敛速度和稳态误差;以此为基础,设计了多通道多频点噪声主动控制方法。经仿真验证可以看出,自适应LMS算法不仅提高了算法收敛速度,而且降低了稳态误差;经驾驶室两通道降噪实验可以看出,多通道噪声主动控制技术可以实现驾驶室多区域降噪,通道一总声压级降低了4.3dB,通道二总声压级降低了9.8dB,充分证明了设计的多通道噪声主动控制方法的有效性。To reduce the noise of cab and construct a favorable driving and riding environment,multi-channel multi-frequency adaptive denoise method is put forward.By analyzing noise feature in cab,the relationship of noise frequency and engine speed is built.Single-channel noise active control method is analyzed,adaptive step-length LMS algorithm is proposed,which make convergency factor varies with noise error adaptively,so that the algorithm not only can speed up convergency,but it can also reduce steady state error.Based on the above improved content,multi-channel multi-frequency noise active control method is designed.it is clarified by simulation that adaptive LMS algorithm not only can speed up convergency,but it can also reduce steady state error.It can be seen from cab two-channel denoise experiment,multi-area noise in cab is reduced by multi-channel noise active control technique.Total sound pressure level of channel 1 reduces by 4.3dB,and 9.8 of channel 2,which prove validity of multi-channel noise active control method proposed by the essay.

关 键 词：噪声主动控制 自适应步长LMS算法 收敛速度 稳态误差 多通道多频点 

分 类 号：TH16[机械工程—机械制造及自动化]