Accession Number:

AD1004465

Title:

Test-Bed Design and Modeling for Aircraft Interior Acoustic Control

Descriptive Note:

Journal Article

Corporate Author:

Massachusetts Institute of Technology Cambridge United States

Personal Author(s):

• Fripp,Michael L.
• O'Sullivan,Donald Q.
• Hall,S. R.
• Hagood,N. W.
• Lilienkamp,K.

Report Date:

1997-06-01

Pagination or Media Count:

12.0

Abstract:

A cylindrical test-bed has been designed and modeled to aid in the study and control of interior acoustics in aircraft. The test-bed accounts for local as well as global structural-acoustic dynamics encountered in typical aircraft. The design is based on several existing aircraft and models used to study aircraft dynamics. The test-bed incorporates the basic geometry and materials common to a majority of aircraft, including an aluminum skin shrouding a framed structure composed of ribs and stringers. The design is approximately a one-third scale representation with a cylindrical geometry measuring 0.91 m diameter and 1.98 m long. The test-bed has been modeled using finite element methods and Rayleigh-Ritz assumed modes analysis. The models were used to refine the design of the test-bed as well as to model the coupled structural-acoustic dynamics. The models predict that the test-bed will have a modal structure commensurate with experimental identifications on existing aircraft.

Descriptors:

• aircrafts
• control systems
• test beds
• structural properties
• acoustics
• models

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE