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A study of methods to predict and measure the transmission of sound through the walls of light aircraft. Integration of certain singular boundary element integrals for applications in linear acousticsAn alternative method for performing singular boundary element integrals for applications in linear acoustics is discussed. The method separates the integral of the characteristic solution into a singular and nonsingular part. The singular portion is integrated with a combination of analytic and numerical techniques while the nonsingular portion is integrated with standard Gaussian quadrature. The method may be generalized to many types of subparametric elements. The integrals over elements containing the root node are considered, and the characteristic solution for linear acoustic problems are examined. The method may be generalized to most characteristic solutions.
Document ID
19860001445
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Zimmerle, D.
(Purdue Univ. West Lafayette, IN, United States)
Bernhard, R. J.
(Purdue Univ. West Lafayette, IN, United States)
Date Acquired
September 5, 2013
Publication Date
July 1, 1985
Subject Category
Acoustics
Report/Patent Number
REPT-0226-16
HL-85-21
NAS 1.26:176229
NASA-CR-176229
Accession Number
86N10912
Funding Number(s)
CONTRACT_GRANT: NAG1-58
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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