CAJ | 학술논문

应用二维有限元法计算穿孔管阻性消声器的横向模态，利用数值模态匹配法计算其传递损失，推导了相应的公式并编写了计算程序。对于圆形同轴穿孔管阻性消声器的传递损失，数值模态匹配法计算结果与三维有限元法计算结果以及实验值吻合良好，表明了二维有限元法计算穿孔管阻性消声器横向模态和数值模态匹配法预测消声性能的准确性。进而分析孔径、穿孔率、吸声材料的密度和穿孔管偏移对圆形直通穿孔管阻性消声器横向模态和消声特性的影响。结果表明，孔径减小、穿孔率增大，或者穿孔管偏移量增大均能使消声器有效的平面波区域变宽，高频消声效果变好，但中频消声效果变差；增加吸声材料的填充密度则能提高消声器中高频的消声量。
응용이유유한원법계산천공관조성소성기적횡향모태，이용수치모태필배법계산기전체손실，추도료상응적공식병편사료계산정서。대우원형동축천공관조성소성기적전체손실，수치모태필배법계산결과여삼유유한원법계산결과이급실험치문합량호，표명료이유유한원법계산천공관조성소성기횡향모태화수치모태필배법예측소성성능적준학성。진이분석공경、천공솔、흡성재료적밀도화천공관편이대원형직통천공관조성소성기횡향모태화소성특성적영향。결과표명，공경감소、천공솔증대，혹자천공관편이량증대균능사소성기유효적평면파구역변관，고빈소성효과변호，단중빈소성효과변차；증가흡성재료적전충밀도칙능제고소성기중고빈적소성량。
The two-dimensional finite element method was used to calculate the transversal modes of a perforated tube dissipative silencer,and the numerical mode matching method was developed to predict its acoustic attenuation performance .The corresponding formulation was derived and the computational code was written.For a circular concentric configuration,the transmission losses achieved using the numerical mode matching method,the three-dimensional finite element method and tests agreed well.This fact demonstrated the correctness of the 2-D finite element method to calculate the transversal modes and that of the numerical mode matching method to predict the transmission loss of a perforated tube dissipative silencer,respectively.The numerical mode matching method was then used to investigate the effects of hole diameter,porosity,density of sound-absorbing material and offset of a perforated tube on the transversal modes and acoustic attenuation characteristics of the circular straight-through perforated tube dissipative silencer.The results showed that smaller hole diameter or higher porosity or bigger offset of perforated tube may lead to wider effective frequency range of plane wave domination,better acoustic attenuation performance in a high-frequency range,and worse acoustic attenuation performance in a middle-frequency range;increasing the filling density of sound-absorbing material may improve the acoustic attenuation of the silencer in a mid to high frequency range.