NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Method of fan sound mode structure determination computer program user's manual: Modal calculation programA computer user's manual describing the operation and the essential features of the Modal Calculation Program is presented. The modal Calculation Program calculates the amplitude and phase of modal structures by means of acoustic pressure measurements obtained from microphones placed at selected locations within the fan inlet duct. In addition, the Modal Calculation Program also calculates the first-order errors in the modal coefficients that are due to tolerances in microphone location coordinates and inaccuracies in the acoustic pressure measurements.
Document ID
19780009123
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Pickett, G. F. (Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Wells, R. A. (Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Love, R. A. (Pratt and Whitney Aircraft Group East Hartford, CT, United States)
Date Acquired
September 3, 2013
Publication Date
August 1, 1977
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA-CR-135295
PWA-5554-5
Accession Number
78N17066
Funding Number(s)
CONTRACT_GRANT: NAS3-20047
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available