Computer Science – Sound
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jsv....48..485b&link_type=abstract
Journal of Sound and Vibration, vol. 48, Oct. 22, 1976, p. 485-510. Research supported by Rolls-Royce (1971), Ltd.
Computer Science
Sound
20
Acoustic Measurement, Jet Aircraft Noise, Microphones, Portable Equipment, Digital Computers, Engine Tests, Integral Equations, Noise Generators, Real Time Operation, Signal Processing
Scientific paper
A system has been developed for real-time sound source location on full-size jet engines. It consists of an array of microphones connected to a small digital computer, via a sequence of preamplifiers, analog filters and analog to digital converters and multiplexer. Microphone signals can be processed on-line to give displays of time varying source distributions or statistical averages with respect to position and frequency, by using a color television as well as a display screen and printer/plotter. The whole system can be transported in a small estate car and can be used on both model scale and full size engine test rigs. The general properties of the system are described, including its use to correlate spatially separated sound sources, application in the presence of ground reflections and use in a moving airstream. A series of experiments on a Rolls-Royce/SNECMA Olympus engine is described, in order to illustrate application of the system.
Billingsley J.
Kinns Roger
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