Optimization of dissipative mufflers

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Abstract

The method of selecting the configuration of dissipative mufflers with the required acoustic efficiency is considered. The peculiarity of the considered approach is the use of an integral indicator of acoustic efficiency and dimensionless geometric parameters. The studies were carried out using finite element calculations. In the finite element model of a dissipative mufflers, acoustic characteristics of a fibrous sound-absorbing material obtained from experimental studies were used.

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About the authors

A. I. Komkin

Bauman Moscow State Technical University

Author for correspondence.
Email: akomkin@mail.ru
Russian Federation, Moscow, 105005

A. I. Bykov

Bauman Moscow State Technical University

Email: akomkin@mail.ru
Russian Federation, Moscow, 105005

L. S. Karnaukhova

Bauman Moscow State Technical University

Email: akomkin@mail.ru
Russian Federation, Moscow, 105005

References

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Supplementary files

Supplementary Files
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2. Fig. 1. Calculation model of a dissipative noise muffler.

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3. Fig. 2. Transmission losses for the first (1) and second (2) muffler configurations as functions of (a) frequency and (b) dimensionless frequency.

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4. Fig. 3. Dependences of transmission losses of prototype mufflers on (a) porosity and (b) diameter of perforation holes.

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5. Fig. 4. Dependences of transmission losses of prototype mufflers on (a) fiber diameter and (b) SPM density.

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6. Fig. 5. Dependences of generalized transmission losses on (a) the porosity coefficient and (b) the diameter of the muffler perforation holes for its relative dimensions: 1 − m = 16, n = 4; 2 − m = 9, n = 7; 3 – m = 4, n = 15.

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7. Fig. 6. Dependences of generalized transmission losses on (a) density and (b) diameter of the ZPM fiber. (The designations are the same as in Fig. 5).

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8. Fig. 7. Dependences of generalized transmission losses on the relative volume of the muffler for ZPM (a) — with ρ = 200 kg/m³, dв = 10 μm and (b) — with ρ = 150 kg/m³, dв = 30 μm at different degrees of expansion of the muffler.

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