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Modal analysis of UH-60A instrumented rotor bladesThe dynamic characteristics of instrumented and production UH-60A Black Hawk main rotor blades were measured, and the results were validated with NASTRAN finite element models. The blades tested included pressure and strain-gage instrumented blades, which are part of the NASA Airloads Flight Research Phase of the Modern Technology Rotor Program. The dynamic similarity of the blades was required for accurate data collection in this program. Therefore, a nonrotating blade modal analysis was performed on the first 10 free-free modes to measure blade similarities. The results showed small differences between the modal frequencies of instrumented and production blades and a close correlation with the NASTRAN models. This type of modal testing and analysis is recommended as a standard procedure for future instrumented blade flight testing.
Document ID
19910009739
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hamade, Karen S. (NASA Ames Research Center Moffett Field, CA, United States)
Kufeld, Robert M. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1990
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.15:4239
A-90252
NASA-TM-4239
Accession Number
91N19052
Funding Number(s)
PROJECT: RTOP 505-61-51
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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