Practical considerations when using the two-load method to determine the transmission loss of mufflers and silencers

X. Hua; David W. Herrin

doi:10.4271/2013-01-1881

Practical considerations when using the two-load method to determine the transmission loss of mufflers and silencers

X. Hua, David W. Herrin

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The two-load method is commonly used to determine the transmission loss of a muffler or silencer. Several practical measurement considerations are examined in this paper. First of all, conical adapters are sometimes used to transition between impedance tubes and the muffler. It is demonstrated that the effect of adding the adapter can be quite significant at low frequencies especially if the adapter is short in length. The effect of changing the length of the adapter was examined via measurement and plane wave theory. Secondly, the effect of selecting the reference microphone was examined experimentally. It was found that measurements are improved by selecting a downstream reference. Finally, the effect of using different frequency response function estimation algorithms (H₁, H₂ and H_v) was compared sans flow. This had little effect on the measurement. 2013 SAE International.

Original language	English
Pages (from-to)	1094-1101
Number of pages	8
Journal	SAE International Journal of Passenger Cars - Mechanical Systems
Volume	6
Issue number	2
DOIs	https://doi.org/10.4271/2013-01-1881
State	Published - 2013

ASJC Scopus subject areas

Modeling and Simulation
Automotive Engineering
Safety, Risk, Reliability and Quality
Mechanical Engineering

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10.4271/2013-01-1881

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abstract = "The two-load method is commonly used to determine the transmission loss of a muffler or silencer. Several practical measurement considerations are examined in this paper. First of all, conical adapters are sometimes used to transition between impedance tubes and the muffler. It is demonstrated that the effect of adding the adapter can be quite significant at low frequencies especially if the adapter is short in length. The effect of changing the length of the adapter was examined via measurement and plane wave theory. Secondly, the effect of selecting the reference microphone was examined experimentally. It was found that measurements are improved by selecting a downstream reference. Finally, the effect of using different frequency response function estimation algorithms (H1, H2 and Hv) was compared sans flow. This had little effect on the measurement. 2013 SAE International.",

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AB - The two-load method is commonly used to determine the transmission loss of a muffler or silencer. Several practical measurement considerations are examined in this paper. First of all, conical adapters are sometimes used to transition between impedance tubes and the muffler. It is demonstrated that the effect of adding the adapter can be quite significant at low frequencies especially if the adapter is short in length. The effect of changing the length of the adapter was examined via measurement and plane wave theory. Secondly, the effect of selecting the reference microphone was examined experimentally. It was found that measurements are improved by selecting a downstream reference. Finally, the effect of using different frequency response function estimation algorithms (H1, H2 and Hv) was compared sans flow. This had little effect on the measurement. 2013 SAE International.

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Practical considerations when using the two-load method to determine the transmission loss of mufflers and silencers

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