Accession Number : AD0710696

Title :   THE RESPONSE OF, AND THE ACOUSTIC RADIATION FROM PANELS EXCITED BY TURBULENT BOUNDARY LAYERS.

Descriptive Note : Technical rept. 1 Dec 66-30 Nov 68,

Corporate Author : SOUTHAMPTON UNIV (ENGLAND) INST OF SOUND AND VIBRATION RESEARCH

Personal Author(s) : Szechenyi,Edmond

Report Date : JUN 1970

Pagination or Media Count : 187

Abstract : The principal aim of the work is to develop approximate solutions for both the response of skin-stringer panels to turbulent boundary layer excitation and the subsequently acoustic radiation from these structures. As a first step, the solution for the response of single simply supported panels is extended to include panels with clamped edges. Using this as the basic theory, solutions for the response of rows and arrays of skin-stringer panels are found by applying a method of effective (or pseudo) wavelengths. Equations for the radiation characteristics of single panels both with fixed and with simply supported edges are established from basic principles. These solutions are then used to find the radiation from arrays of bays by introducing a qualitatively derived system of relative bay phases. The combination of the radiation characteristics and of the response gives acoustic power radiation due to turbulent boundary layer excitation. This shows an interesting result which is probably particular to this form of exciation, that is, that for most practical configurations the acoustic power radiated by an array of bays does not exceed the arithmetic sum of the powers radiated separately by each bay. (Author)

Descriptors :   (*AIRPLANE PANELS, VIBRATION), (*AIRCRAFT NOISE, TURBULENT BOUNDARY LAYER), RESPONSE, AIRCRAFT CABINS, FUSELAGES, GREAT BRITAIN

Subject Categories : Aircraft
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE