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有源声吸收单元吸声量计算及吸声机理研究
引用本文:陈克安.有源声吸收单元吸声量计算及吸声机理研究[J].振动工程学报,1998,11(4):402-409.
作者姓名:陈克安
作者单位:西北工业大学航海工程学院
基金项目:国家自然科学基金,国家教委“跨世纪优秀人才培养计划”基金
摘    要:多个有源吸声单元可构成有源吸声层,用于吸收任意方向入射的低频声波。本文利用声弹性理论研究吸声单元的声场与振动特性,从理论上计算了有源控制前后吸声单元的吸声性能,研究了影响吸声效果的诸因素以及吸声机理。

关 键 词:吸声  吸声板  有源振动控制  声-振耦合

Study on Mechanisms and Sound Absorption of Active Element
Chen,Kean.Study on Mechanisms and Sound Absorption of Active Element[J].Journal of Vibration Engineering,1998,11(4):402-409.
Authors:Chen  Kean
Abstract:This paper is concerned with sound absorption and mechanisms of the proposed active surface consisting of a number of active elements,which is proposed by the author and applied to actively absorb obliquely incident sound wave at low frequencies.First,the theoretical model of active elements is established,and sound field analysis is carried out using the acoustic elasticity theory.It is demonstrated from analytical investigation and computer simulations that sound absorption of the active surface depends on cavity dimensions,type,number and location of the secondary force sources.Furthermore,it is shown that there exist two kinds of mechanism of sound absorption,suppression of sound radiation at panel controlled frequency and cancellation of geometrical reflection at cavity controlled frequencies.
Keywords:acoustic  absorption  acoustical  board  active  contol  of  vibration  acoustic  structural  coupling
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