Design for prevention of acoustic fatigueIt is pointed out that new noise prediction methods and acoustic life estimation methods have matured to the point where they can be combined into a unified engineering procedure. "Life derivatives" can be extracted from parametric charts to furnish design data for preventing acoustic fatigue. The acoustic fatigue life is shown to be sensitive to the damping ratio through the use of life derivatives. The localized nature of propeller noise can be quantified with an "isodecibel" contour diagram.Even though the peak sound pressure level may be high, the directional derivatives show the noise decay rates with distance. Acoustic fatigue design is discussed from the overall design methodology and is shown to be similar to other structural design problems. While nonlinearities present a formidable design engineering problem, they are manageable by proven semi-empirical techniques. For new design problems, it is imperative to determine whether the data base completely spans the design variables.
Document ID
19830048564
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smith, H. W. (Kansas, University Lawrence, KS, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
AIAA PAPER 83-0973
Meeting Information
Meeting: Structures, Structural Dynamics and Materials Conference