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

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.
Date: May 1953
Creator: Stokes, George M & Davis, Don D , Jr
Partner: UNT Libraries Government Documents Department