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中文核心期刊

对低频声波的吸声体

Low frequency sound absorbers

  • 摘要: 本文考察了对20Hz—100Hz的低频声的有效吸声体。分析表明,电磁感应式表面吸声体是个可行的选择方案。单一表面吸声体的理想吸声系数极限为50%。若在此表面体的背后平行地放置一硬墙壁面就构成共振吸声系统。这样的系统可以在整个低频波段上吸收55%以上的声能,在其中的一些频率区域内还达90%以上。表面体的运动还可以用电子线路来控制从而使得该表面体的等效参数达到最佳值。用这种途径可以较容易地研制成对高强度低频声波的理想吸声系统。

     

    Abstract: Several kinds of effective absorbers of very low frequency (20 Hz-100 Hz) sound waves are examined. Comparisons show that a surface absorber of electromagnetic induction type is a feasible choice. The theoretical limitation of the absorption coefficient of the single surface absorber is 50%. A resonator system of sound absorption can be constructed by the surface absorber and a rigid wall on the back of and parallel to the surface. Absorption coefficients larger than 55% for the entire range of very low frequency may be obtained by the system. The absorption coefficients at some frequencies may be larger than 90%. The motion of the surface can be controled by an electronic circuitry in order to obtain optimum values of the equivalent parameters of the surface. It is therefore rather easy, based on the electromagnetic induction surface absorber, to develop a sturdy and perfect absorber system of very low frequency sound waves.

     

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