Abstract:

The analysis of radiated sound and vibrational signatures of engines may be useful for monitoring an engine's performance and assessing the need for maintenance. Measurements of the vibrational signatures and exhaust noise produced by normal engines and engines with known faults will be presented along with a corresponding model for engine exhaust noise. The results of power spectral and higher-order spectral processing of the engine noise will be compared and their usefulness as a means of detecting faulty engine operation will be discussed. [Work supported by the Office of Naval Research, Contract No. N00014-96-1-0298-7.]