This paper describes the use of digital measurements to assess acoustic intensity close to the various surfaces of a two litre gasoline engine. Using phase-locked data acquisition an acoustic power balance is constructed for the engine which is shown to correlate well with three other methods - lead covering, average surface vibration level and close microphone. However, the prediction of sound pressure level from these power balances is shown to be difficult, at least at 1 m from the surface. A simple relationship between acoustic intensity and sound pressure level in the frequency domain has been found.
Digital Acoustic Intensity Techniques in Gasoline Engine Noise Studies
Sae Technical Papers
SAE International Congress and Exposition ; 1982
1982-02-01
Conference paper
English
Digital Acoustic intensity Techniques in Gasoline Engine Noise Studies
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