The Resource Turbofan aft duct suppressor study : program listing and user's guide, M.C. Joshi, R.E. Kraft, (microform)

Turbofan aft duct suppressor study : program listing and user's guide, M.C. Joshi, R.E. Kraft, (microform)

Label
Turbofan aft duct suppressor study : program listing and user's guide
Title
Turbofan aft duct suppressor study
Title remainder
program listing and user's guide
Statement of responsibility
M.C. Joshi, R.E. Kraft
Creator
Contributor
Subject
Language
eng
Summary
"A description of the structure of the Annular Flow Duct Program (AFDP) for the calculation of acoustic suppression due to treatment in a finite length annular duct carrying sheared flow is presented. Although most appropriate for engine exhaust ducts, this program can be used to study sound propagation in any duct that maintains annular geometry over a considerable length of the duct. The program is based on the modal analysis of sound propagation in ducts with axial segments of different wall impedances. For specified duct geometry, wall impedance, flow and acoustic conditions in the duct (including mode amplitude distribution of the source) and duct termination reflection characteristics, the program calculates the suppression due to the treatment in the duct. The presence of forward and backward traveling modes in the duct due to the reflection and redistribution of modes at segment interfaces and duct end terminations are taken into account in the calculations. The effects of thin wall boundary layers (with a linear or mean flow velocity profile) on the acoustic propagation are also included in the program. A functional description of the major subroutines is included and a sample run is provided with an explanation of the output."--NTIS abstract
Member of
Cataloging source
COD
http://library.link/vocab/creatorName
Joshi, M. C
Funding information
NASA (NASA Lewis Research Center) contract no.
Government publication
federal national government publication
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
technical reports
http://library.link/vocab/relatedWorkOrContributorName
  • Kraft, R. E.
  • Douglas Aircraft Company
  • Lewis Research Center
  • United States
Series statement
CR
Series volume
175067
http://library.link/vocab/subjectName
  • Airplanes
  • Airplanes
  • Air ducts
  • Exhaust systems
  • Acoustic impedance
  • Acoustic propagation
  • Annular ducts
  • Applications programs (computers)
  • Engine noise
  • Exhaust systems
  • Noise reduction
  • Turbofan engines
  • User manuals (computer programs)
Type of report
Final report.
Label
Turbofan aft duct suppressor study : program listing and user's guide, M.C. Joshi, R.E. Kraft, (microform)
Instantiates
Publication
Note
  • "May 1983."
  • Distributed to depository libraries in microfiche
Base of film
safety base undetermined
Carrier category
microfiche
Carrier category code
he
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
txt
Content type MARC source
rdacontent
Control code
ocm233990580
Dimensions
4x6 in. or 11x15 cm.
Emulsion on film
diazo
Extent
iii, 99 pages
Form of item
microfiche
Generation
service copy
Media category
microform
Media MARC source
rdamedia
Media type code
h
Other physical details
illustrations.
Positive negative aspect
negative
http://bibfra.me/vocab/marc/reductionRatio
02
ReductionRatioRange
normal reduction
Reproduction note
Microfiche.
Specific material designation
microfiche
Stock number
N 86-25357
System control number
(Sirsi) a1140754
Label
Turbofan aft duct suppressor study : program listing and user's guide, M.C. Joshi, R.E. Kraft, (microform)
Publication
Note
  • "May 1983."
  • Distributed to depository libraries in microfiche
Base of film
safety base undetermined
Carrier category
microfiche
Carrier category code
he
Carrier MARC source
rdacarrier
Color
black and white
Content category
text
Content type code
txt
Content type MARC source
rdacontent
Control code
ocm233990580
Dimensions
4x6 in. or 11x15 cm.
Emulsion on film
diazo
Extent
iii, 99 pages
Form of item
microfiche
Generation
service copy
Media category
microform
Media MARC source
rdamedia
Media type code
h
Other physical details
illustrations.
Positive negative aspect
negative
http://bibfra.me/vocab/marc/reductionRatio
02
ReductionRatioRange
normal reduction
Reproduction note
Microfiche.
Specific material designation
microfiche
Stock number
N 86-25357
System control number
(Sirsi) a1140754

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