窄带主动噪声控制系统中频率不匹配的应对理论和方法研究

项目名称： 窄带主动噪声控制系统中频率不匹配的应对理论和方法研究

项目编号： No.61201364

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 刘剑

作者单位： 南京航空航天大学

项目金额： 24万元

中文摘要： 窄带主动噪声控制（ANC）在低频窄带噪声抑制技术中具有重要应用价值。为避免声反馈，在窄带ANC系统中往往采用非声学传感器拾取同步信号，再通过信号发生器产生参考信号。传感器长时间工作，由于磨损等因素，通常导致系统产生参考信号频率与原始噪声频率不匹配（FM）的现象。对于线性系统，FM的存在将使系统无法有效抑制目标噪声。本项目拟研究应对这种窄带ANC系统中FM问题的理论和方法。理论上，拟通过从时域和实域分析存在FM的窄带ANC系统的性能，包括动态和稳态性能，探讨FM对系统性能的制约机理；依据性能分析结果，设计出自适应变步长控制算法，使新系统即使存在一定程度的FM，仍能有效抑制目标噪声。实验中，以管道为实验平台，探讨拟研究的FM应对方法在实际声学环境的应用及其衍生问题。课题研究成果将丰富ANC的理论研究，推进ANC技术的科学进步。

中文关键词： 窄带主动噪声控制；频率不匹配；统计分析；变步长；非线性

英文摘要： Narrowband Active Noise Control (ANC) has the important applicable value among low-frequency narrowband noise suppressing technologies. To avoid the acoustic feedback, in a narrowband ANC system, one non-acoustic sensor may be usually adopted to abtain the synchronization signal fed to the signal generator for generating reference signal. The frequency mismatch (FM) may exist between the reference signal and the primary noise due to sensor aging, fatigue accumulation, etc. It will not effectively suppress the noise being targeted if FM presents in a linear system. The proposed project towards research on theory and approach for mitigation of such FM in a narrowband ANC system. Theoretically, this project will investigate the restriction mechanism of FM on the system through analyzing the performance, including dynamics and steady-state performance, of the narrowband ANC system in the presence of FM, from time and real domains. Based on the analysis results, the project will also design an adaptive variable step-size control algorithm, which enables the modified system to effectively remove the primary noise even in the presence of FM to a certain degree. In experiments, a platform with one pipe is preliminarily set up for the research on real-life applications and variation problems of the proposed approach for

英文关键词： Narrowband active noise control；frequency mismatch；statistical analysis；variable step size；nonlinearity