CAJ | 학술논문

传统的消声器声学性能计算和实验测量都是在消声器进出口管道作为平面波声场的条件下进行，当进出口管道内出现有高阶模态激发的三维声场时，这些计算方法和实验测量方法就不再适用。由此，采用消声器进出口管道内加径向隔板的方法来计算消声器的声学性能，当原来管道声场中出现高阶模态时，仍然可以用平面波方法计算消声器的传递损失。应用该方法对进气滤清消声器进行传递损失数值计算，在原来进出口管道的平面波声场范围内，计算结果与传统方法计算结果均接近实验的测量结果，验证了该方法预测消声器声学性能的可行性。进而在所设计的消声器中频声学性能实验测试台架上，用声波分解法对阻性消声器进行传递损失测试，实验测量结果和有限元仿真结果也吻合良好。
전통적소성기성학성능계산화실험측량도시재소성기진출구관도작위평면파성장적조건하진행，당진출구관도내출현유고계모태격발적삼유성장시，저사계산방법화실험측량방법취불재괄용。유차，채용소성기진출구관도내가경향격판적방법래계산소성기적성학성능，당원래관도성장중출현고계모태시，잉연가이용평면파방법계산소성기적전체손실。응용해방법대진기려청소성기진행전체손실수치계산，재원래진출구관도적평면파성장범위내，계산결과여전통방법계산결과균접근실험적측량결과，험증료해방법예측소성기성학성능적가행성。진이재소설계적소성기중빈성학성능실험측시태가상，용성파분해법대조성소성기진행전체손실측시，실험측량결과화유한원방진결과야문합량호。
The traditional calculation and measurement methods of the transmission loss of mufflers are based on the assumption of plane wave propagation in the inlet and outlet ducts. These methods are not valid any more to predict the acoustical performance of mufflers when the three-dimensional sound field excited by the higher-order modes occurs in inlet and outlet ducts. In this paper, a method was proposed to calculate the acoustic performance of mufflers by adding radial panels in the inlet and outlet ducts. Therefore the plane wave decomposition method could still be used to predict the transmission loss of the mufflers until the second higher order modal frequency occurred. This method was then applied to calculate the transmission loss of an intake filter muffler, and the computation results agreed well with the experimental results and conventional finite element prediction, which confirmed the applicability of the method. A test-bench for middle frequency acoustic performance of mufflers was designed, and the plane wave decomposition method was employed to measure the transmission loss of a dissipative muffler. The measurement result and finite element numerical result are in good agreement generally.