Abstract:

Structural optimization for radiation noise control of a simply supported plate is carried out using the time domain radiation modes. Recent study shows that these radiation modes in the time domain can radiate sound power individually, and the first order radiation mode is the dominant one. Based on these findings the design of Active Structureal Acoustic Control system is presented to cancel the first radiation modes amplitude by filter xLMS algorithm. And the optimization of arrangement of controlling force sources is analyzed and discussed. Finally, the validity of the proposed method is verified by a numerical example.

Key words: acoustics, noise, timedomain radiation mode, active control, simulation

摘要：

以简支矩形板为例，利用时域声辐射模态进行噪声的结构优化控制。已有研究表明时域辐射模态能独立地辐射声功率，并且振动结构辐射的声功率主要由第一阶辐射模态的声功率决定。在此基础上进行简支板辐射噪声的结构优化控制，并对最优控制力源的位置进行了讨论和分析。最后设计自适应前馈控制系统对控制效果进行仿真验证。

关键词: 声学, 噪声, 时域辐射模态, 主动控制, 仿真