分散式有源声屏障系统稳定性研究  

Stability analysis of decentralized active noise barrier

作　　者：骆耀东 邹海山[1] 邱小军 Luo Yaodong;Zou Haishan;Qiu Xiaojun(Key Laboratory of Modern Acoustics,Ministry of Education,Institute of Acoustics,Nanjing University,Nanjing,210093,China;Center for Audio,Acoustics and Vibration,Faculty of Engineering and Information Technology,University of Technology Sydney,Sydney 2007,Australia)

机构地区：[1]近代声学教育部重点实验室,南京大学声学研究所,南京210093 [2]悉尼科技大学工程与信息技术学院,声与振动中心,悉尼2007,澳大利亚

出　　处：《南京大学学报（自然科学版）》2020年第6期909-916,共8页Journal of Nanjing University（Natural Science）

基　　金：国家自然科学基金(11874218,11874219)。

摘　　要：有源声屏障可提升传统声屏障的低频降噪性能.使用多通道控制系统的有源声屏障分为集中式系统和分散式系统,前者复杂度高,后者采用具有独立控制单元的分散式系统来降低前者的复杂度,但稳定性降低.首先从理论上分析保持分散式系统稳定的必要条件和提升系统稳定性的方法,其次,通过数值仿真研究分散式系统次级路径传递函数相关的特定矩阵的特征值分布规律,最后根据分布规律提出一种简单易行的方法,即通过调整特定矩阵特征值的相位,提升分散式系统的稳定性.仿真结果表明,该方法可使满足一定条件的不稳定分散式系统变得稳定,且不影响系统收敛稳定后的降噪性能.Active noise barriers can improve the insertion loss of traditional noise barriers at low frequencies.Noise barriers with multi-channel active control can be categorized into centralized or decentralized systems.The former has higher complexity,but the latter has lower system stability due to its independent and simpler control units.In this paper,the necessary conditions and possible improvements for the stability of the decentralized system are analyzed theoretically and numerically.The eigenvalue distribution of the specific matrix generated by the secondary path transfer functions of the system is investigated.An effective method is proposed to adjust the phase of the specific matrix eigenvalues to improve the stability of the decentralized system.The simulation results show that the proposed method can improve the system stability under certain conditions without scarificing its noise reduction performance.

关 键 词：有源控制 声屏障 分散式 系统稳定性 

分 类 号：O429[理学—声学]