Abstract
An acoustic model study was made of the silencer for a propeller engine test cell in which the acoustical treatment consisted of conventional splitters for high frequency silencing and thick splitters designed to give low frequency reduction. After construction of the test cell, field measurements were made of the noise reduction provided by the silencing treatment, using as a sound source both a propeller engine and loudspeakers driven by a thermal noise source. In this paper, the techniques developed for simulation in the scale model of the acoustic properties of the full scale silencer will be discussed. The model study results will be presented and compared to theoretical predictions and to the field measurements on the full scale structure.
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