Acoustic protection on payload fairings of expendable launch veh

Details Acoustic protection on payload fairings of expendable launch veh Acoustic protection on payload fairings of expendable launch veh

1995-06-21

1997-09-23

Dang, Khanh

Acoustics

Sound-modifying means

Sound absorbing panels

181288, 181292, 181294, 181295, E04B 182

Patent

active

056707584

ABSTRACT:
By means of this acoustic protection it is possible to protect the payloads of expandable launch vehicles effectively against noise emissions from the rocket propulsion system which result in damage of the payloads. For this purpose acoustic absorbers (8) tuned to a defined frequency range are provided and are arranged in foamed plastic mats (7) disposed on the insides (6) of the payload fairing (1). The acoustic absorbers (8) are composed of a cup-shaped lower part (12) and an upper part (13) having a horn (18). The horn (8) tapers in a curved-conical manner from a larger diameter (D.sub.m) to a smaller diameter (D.sub.t) and projects into the lower part (12) by a defined distance (a) from a bottom (14) thereof. Slits (21) for the dissipation of the directed flow energy occurring in the horn (18) are disposed in the wall of the horn in the area of the smaller diameter (D.sub.t).

REFERENCES:
patent: 3887031 (1975-06-01), Wirt
patent: 4667768 (1987-05-01), Wirt
patent: 5185504 (1993-02-01), Jen
patent: 5445861 (1995-08-01), Newton et al.

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