STRUCTURAL ASPECTS OF ACOUSTIC LOADS
Abstract
A review of the experimental and theoretical work on the various structural aspects of acoustic loads is given. The sound pressure levels in the near field of jets and rockets have been investigated experimentally for a range of operating conditions on a few engines. Extrapolation of these data to other engines shows a rapid decrease in accuracy as the difference in the two engine conditions increases. The considerable amount of data on boundarylayer pressure fluctuations establishes that the skin root-mean-square pressure level up to transonic speeds is approximately equal to 0.006 q and that the spectrum is probably sufficiently well defined for structural response estimates. A large section of the work reported is devoted to the evaluation of structural response to random pressure fluctuations. Theories have been developed for the response of simple structures to noise but none is directly applicable to practical structures because of the lack of normal mode and other data. Some limited investigations on the types of modes being excited have begun. The effective use of additional damping compounds and the assessment of basic damping in a structure depend on a knowledge of the modes being excited. A variety of test procedures and design philosophies have been adopted. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1960
- Accession Number
- AD0294146
Entities
People
- B. L. Clarkson
Organizations
- AGARD