Workshop Report for the 4th AIAA Aeroacoustics Conference

Abstract

T*HE AIAA is ever striving to keep its membership inA formed of the latest developments and status of its several disciplines. The Aeroacoustic Technical Committee, at its 3rd Specialists Conference, established a concept of technical workshops to review the respective subject areas. These workshops are intended to create open discussion on the state of the various subtechnology problems, recent accomplishments, the major problem areas, to air legitimate differences, and to propose future needs and courses of action all from a technological point of view. These workshops are now a regular part of Aeroacoustic Conferences. This article is a summary-of the workshops conducted at the 4th AIAA Aeroacoustic Conference in October of 1977. The chairmen of these workshops prepared written summaries. These have been edited and give an overview of the status of noise technology. Specifically addressed are Jet Exhaust Noise, Turbomachinery Noise, Duct Acoustics, Aircraft Engine Core Noise, Airframe Noise, Sonic Boom and Atmospheric Wave Propagation, and V/STOL Noise Technology. Aeroacoustics is a maturing technology. Significant Advances have been made to reduce aircraft noise; witness the current widebody aircraft and the future aircraft whose designs are now under serious consideration. Substantial work will be required to produce additional significant reductions. The trend of diminishing support for technology research and development is counter to future large-increment reductions in aircraft noise. Noise is a difficult and complicated technology; new sources often appear as current sources are suppressed o«r reduced. How quiet is quiet enough? is always a valid question. However, proposed and projected noise legislation certainly will necessitate a relatively major national commitment (a reversal of trends). Much work, from basic mechanism understanding to applied demonstrations, remains to be done.