An improved source model for aircraft interior noise studiesThere is concern that advanced turboprop engines currently being developed may produce excessive aircraft cabin noise level. This concern has stimulated renewed interest in developing aircraft interior noise reduction methods that do not significnatly increase take off weight. An existing analytical model for noise transmission into aircraft cabins was utilized to investigate the behavior of an improved propeller source model for use in aircraft interior noise studies. The new source model, a virtually rotating dipole, is shown to adequately match measured fuselage sound pressure distributions, including the correct phase relationships, for published data. The virtually rotating dipole is used to study the sensitivity of synchrophasing effectiveness to the fuselage sound pressure trace velocity distribution. Results of calculations are presented which reveal the importance of correctly modeling the surface pressure phase relations in synchrophasing and other aircraft interior noise studies.
Document ID
19850048238
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mahan, J. R. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Fuller, C. R. (Virginia Polytechnic Institute and State University Blacksburg, VA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1985
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 85-0787
Meeting Information
Meeting: Structures, Structural Dynamics, and Materials Conference