The attenuation characteristics of four specially designed mufflers tested on a practical engine setup

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Description

Attenuation characteristics of four different resonator mufflers were determined in both cold tests and engine field tests and compared with the theoretical calculations. These mufflers were specifically designed for a helicopter. Engine-exhaust sound pressures, temperatures, and noise levels from the helicopter were measured. The experimental muffler cold tests indicated close a agreement with theory, whereas the engine tests indicated some discrepancies. Test results show the usefulness of the theoretical equation used for predicting muffler attenuation characteristics.

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30 p. : ill.

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Stokes, George M. & Davis, Don D., Jr. May 1953.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 108 times. More information about this report can be viewed below.

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  • Main Title: The attenuation characteristics of four specially designed mufflers tested on a practical engine setup
  • Series Title: NACA Technical Notes

Description

Attenuation characteristics of four different resonator mufflers were determined in both cold tests and engine field tests and compared with the theoretical calculations. These mufflers were specifically designed for a helicopter. Engine-exhaust sound pressures, temperatures, and noise levels from the helicopter were measured. The experimental muffler cold tests indicated close a agreement with theory, whereas the engine tests indicated some discrepancies. Test results show the usefulness of the theoretical equation used for predicting muffler attenuation characteristics.

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30 p. : ill.

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  • Accession or Local Control No: 93R12973
  • URL: http://hdl.handle.net/2060/19930083683 External Link
  • Report No.: NACA-TN-2943
  • Center for AeroSpace Information Number: 19930083683
  • Archival Resource Key: ark:/67531/metadc56727

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

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  • May 1953

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  • Nov. 16, 2011, 7:33 a.m.

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  • April 11, 2018, 2:31 p.m.

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Stokes, George M. & Davis, Don D., Jr. The attenuation characteristics of four specially designed mufflers tested on a practical engine setup, report, May 1953; (https://digital.library.unt.edu/ark:/67531/metadc56727/: accessed September 13, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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