| An investigation on the acoustic characteristics of microperforated muffler |
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| 引用本文： | HUANG Qibai, LU Wenxiang, SHI Hanmin and YANG Shuzi(Mechanical Engineering Department. Huazhong University of Science and Tech. Wuhan 430074). An investigation on the acoustic characteristics of microperforated muffler[J]. 声学学报：英文版, 1994, 0(1) |
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| 作者姓名： | HUANG Qibai LU Wenxiang SHI Hanmin and YANG Shuzi(Mechanical Engineering Department. Huazhong University of Science and Tech. Wuhan 430074) |
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| 摘 要： | I.lntroductionTheac0usticperformanccofmicropcrforatedmumerhasbeengreatlynoticedinre-ccntyears.Especially,itshighsi1encingva1ueandbroadsi1encingfrequencyrangeenableittobeusedwidelyinmanyyiclds,suchasvehicleexhaustsystem,ventilator.Butitisdifficulttodesignagoodsilcnccrbecauseoritscomp1exacousticperformanccwithinPerforatedtubes.Thegoverningwaveequationofmicroperforatedmufflerisnotlinearduetothenonuniformmassflowofgasaswc11asthetcmpcraturegradientalongthePerforatedducts.Inordertoutilizethegoodsi…
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An investigation on the acoustic characteristics of microperforated muffler |
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| HUANG Qibai, LU Wenxiang, SHI Hanmin and YANG Shuzi. An investigation on the acoustic characteristics of microperforated muffler[J]. Chinese Journal of Acoustics, 1994, 0(1) |
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| Authors: | HUANG Qibai LU Wenxiang SHI Hanmin YANG Shuzi |
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| Affiliation: | Mechanical Engineering Department. Huazhong University of Science and Tech. Wuhan 430074 |
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| Abstract: | A mathematical model for insertion loss in a micro-perforated muffler with the effects of temperature gradient, gas flow speed and structure parameter is obtained by the mode matching technique. By dividing the microperforated tube into N segments, and assuming the flow speed and temperature are constant in each element, sound pressure and volume velocity of each segment can be readily acquired. The transmission matrix of microperforated muffler can be established based on the continuity condition of adjacent elements on the boundary. The numerical results of the present theory are calculated and the experiment is performed in Shanghai-495A engine. The experimental results of microperforated muffler show that they are in good agreement with the theoretical results. |
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| Keywords: | Muffler Microperforated acoustic plate Temperature gradient Noise control Insertion loss |
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