Abstract
A considerable part of the structure borne vibration in small aircraft is caused by both mechanically and acoustically induced vibration from the aircraft engine. The measurement method suggested within this work obtains the acoustic impedance of an active acoustic source; particular emphasis will be placed on the measurement procedure and apparatus for acquiring the source impedance characteristics of an internal combustion engine. The acoustic impedance is directly used to identify a mismatching impedance and when physically implemented with the acoustic source eliminates much of the acoustic energy output. This project utilized a two sensor sampling technique for obtaining the acoustic impedance of an active acoustic system. The two sensor method of analysis incorporates a Digital Signal Analyzer system to calculate incident‐reflected acoustic properties. The laboratory method of experimentation includes exposure of the engine to a broadband random noise while performing sensor signal analysis using a transfer function technique. [Work supported by Nelson Industries, Inc.]
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