Abstract
Low‐frequency noise emission from facilities designed for the ground runup testing of jet engines can be a source of annoyance to communities near military air bases. Noise measurements, using arrays of microphones and accelerometers at a number of U.S. Air Force hush houses, provide information regarding the source characteristics. Comparisons are made between noise from a single aircraft both inside and outside a hush house. Source location calculations indicate that low‐frequency noise originates from a region near the trailing edge of the jet exhaust deflector. Coherence between selected near‐field and far‐field sensors is found to be sufficiently high to warrant experimental investigation of the active reduction of noise from a full scale hush house, using feedforward control techniques, following on from the small scale hush house experiments described by J. P. Smith et al. [ 3332(A) (1994)]. [Work sponsored by the U.S. Air Force.]
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