Try Mobilus Beta
Search tips
 This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Practical Considerations when using the Two-Load Method to Determine the Transmission Loss of Mufflers and Silencers

Journal Article
2013-01-1881
ISSN: 1946-3995, e-ISSN: 1946-4002
DOI: https://doi.org/10.4271/2013-01-1881
Published May 13, 2013 by SAE International in United States
Practical Considerations when using the Two-Load Method to Determine the Transmission Loss of Mufflers and Silencers
Sector:
Citation: Hua, X. and Herrin, D., "Practical Considerations when using the Two-Load Method to Determine the Transmission Loss of Mufflers and Silencers," SAE Int. J. Passeng. Cars - Mech. Syst. 6(2):1094-1101, 2013, https://doi.org/10.4271/2013-01-1881.
Language: English

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.

Recommended Content

Journal Article Adding Bypass Ducts to Enhance Muffler Performance without Increasing Size
Journal Article Investigation of Post-Flame Oxidation of Unburned Hydrocarbons in Small Engines
Technical Paper Exhaust Muffler Design and Analysis Using a Boundary Element Method Based Computer Program