Accession Number : AD0270457

Title :   RESPONSE OF ELECTRONICS TO INTENSE SOUND FIELDS

Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MASS

Personal Author(s) : NOISEUX,DENNIS U. ; COLES,JAMES J.

Report Date : NOV 1961

Pagination or Media Count : 1

Abstract : The intense sound fields present in missiles and other flight vehicles may cause serious malfunction of electronic equipment. Efforts were made to determine the possible ways in which intense sound can excite electronic equipment, to localize the probable areas of failure or malfunction, and to propose testing procedures for electronic equipment. Two areas of possible malfunction were investigated. The first is the printed circuit board, which serves as the final supporting structure for an electronic component. It was found that the electrical noise output from biased condensers mounted on the printed circuit boards was in the order of 10 microvolts per g of acceleration. It was found, furthermore, that the usual hard coatings applied to the boards tended to increase the electrical noise output. This was also observed to some extent when a hard plaster damping material was applied to the boards. The second area of investigation was the response of a rectangular box to acoustic and to vibration excitation. It was found that the acoustic transmissibility of the largest panel of the box was about unity at a resonance and 20 db below this off resonance. Other tests showed that the coupling of vibration among the sides of the box was predominantly by mechanical paths and, furthermore, that the transmissibility of vibration approached 30 db at certain resonances. (Author)

Descriptors :   *ACOUSTIC IMPEDANCE, *ACOUSTICS, *CIRCUITS, *ELECTRONIC EQUIPMENT, *PRINTED CIRCUITS, ACCELERATION, AIRBORNE, CAPACITORS, DAMPING, GUIDED MISSILES, MEASUREMENT, RELIABILITY, RESONANCE, VIBRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE