Propeller modelling effects on interior noise in cylindrical cavities with application to active controlThe coupling of a vibrating finite elastic cylinder and its interior cavity, closed with rigid end caps, is examined. Results are presented for several types of excitation including a point force, a single external acoustic monopole, and an array of external monopoles. Modal spectra are examined for a frequency range typical of the harmonic noise produced by advanced turbo-props. The effect of frequency and source distribution on modal content is presented. Significant interface modal filtering, which would have a beneficial impact on an active system for reducing interior noise, was found to occur for all cases. Some preliminary experimental data for a stiffened, composite cylinder are presented and discussed.
Document ID
19890046386
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Silcox, R. J. (NASA Langley Research Center Hampton, VA, United States)
Lester, H. C. (NASA Langley Research Center Hampton, VA, United States)