CAJ | 학술논문

基于Helmholtz共振器原理，研究利用声学共振器降低封闭空间内部声压级。首先，利用有限元法计算封闭空间的声模态，为其内部场点和声源位置的选取提供依据。然后，根据所要降低噪声的频率设计出声学共振器，借助Virtual Lab Acoustics软件计算在封闭空间中放置声学共振器前后同一场点的声压级，经对比发现声学共振器可以明显降低封闭空间内部声压级。试验表明仿真计算结果是可信的。
기우Helmholtz공진기원리，연구이용성학공진기강저봉폐공간내부성압급。수선，이용유한원법계산봉폐공간적성모태，위기내부장점화성원위치적선취제공의거。연후，근거소요강저조성적빈솔설계출성학공진기，차조Virtual Lab Acoustics연건계산재봉폐공간중방치성학공진기전후동일장점적성압급，경대비발현성학공진기가이명현강저봉폐공간내부성압급。시험표명방진계산결과시가신적。
Based on Helmholtz resonator theory, sound resonator was applied to reduce the sound pressure level in enclosures. First of all, in order to choose appropriate positions of sound sources and internal field points in the enclosure, acoustic modals of the enclosure were computed by means of finite element method (FEM). Then, the sound resonator was designed according to the frequencies of the noise which need to be controlled. Virtual Lab acoustics software was used to compute the sound pressure level at the field points in the enclosure before and after the resonator installed. By comparing the sound pressure levels at the same field point with and without sound resonator in the enclosure, it was found that the sound resonator can significantly reduce the sound pressure level in the enclosure. Finally, the validity of this numerical method was verified by experiments.