Acoustic guide for noise-transmission testing of aircraft

Details Acoustic guide for noise-transmission testing of aircraft Acoustic guide for noise-transmission testing of aircraft

1985-07-03

1987-02-24

Ciarlante, Anthony V.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73589, 73599, G01N 2900

Patent

active

046447946

ABSTRACT:
The invention is an apparatus which allows selective testing of aircraft or other vehicular components without requiring disassembly of the vehicle or components. The invention consists of a broad-band noise source 11, a guide 12 to direct the acoustic energy, soft sealing insulation 17 to seal the guide to the noise source and to the vehicle component, and noise measurement microphones 13, 14, both outside the vehicle at the acoustic guide output and inside the vehicle to receive attenuated sound. By directing acoustic energy only to selected components of a vehicle via the acoustic guide, it is possible to test a specific component, such as a door or window, without picking up extraneous noise which may be transmitted to the vehicle interior through other components or structure. This effect is achieved because no acoustic energy strikes the vehicle exterior except at the selected component. Also, since the test component remains attached to the vehicle, component dynamics with vehicle frame are not altered.

REFERENCES:
patent: 3254739 (1966-06-01), Hardy
patent: 3470734 (1969-10-01), Agdur et al.
patent: 4204432 (1980-05-01), Pujolle et al.
patent: 4289032 (1981-09-01), Tominaga et al.
patent: 4366712 (1983-01-01), Bathmann et al.
patent: 4397187 (1983-08-01), Stribling

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