NDLI: Analytical and experimental investigation of mistuning in propfan flutter

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Analytical and experimental investigation of mistuning in propfan flutter

Content Provider	NASA Technical Reports Server (NTRS)
Author	Moss, Larry A. Mehmed, Oral Williams, Marc Kaza, Krishna Rao V.
Copyright Year	1987
Description	An analytical and experimental investigation of the effects of mistuning on propfan subsonic flutter was performed. The analytical model is based on the normal modes of a rotating composite blade and a three-dimensinal subsonic unsteady lifting surface aerodynamic theory. Theoretical and experimental results are compared for selected cases at different blade pitch angles, rotational speeds, and free-stream Mach numbers. The comparison shows a reasonably good agreement between theory and experiment. Both theory and experiment showed that combined mode shape, frequency, and aerodynamic mistuning can have a beneficial or adverse effect on blade damping depending on Mach number. Additional parametric results showed that alternative blade frequency mistuning does not have enough potential for it to be used as a passive flutter control in propfans similar to the one studied. It can be inferred from the results that a laminated composite propfan blade can be tailored to optimize its flutter speed by selecting the proper ply angles.
File Size	2800140
Page Count	21
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870008683
Archival Resource Key	ark:/13960/t72v7f80k
Language	English
Publisher Date	1987-01-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Finite Element Method Rotor Blades Turbomachinery Prop-fan Technology Wind Tunnel Tests Mathematical Models Ply Orientation Flutter Analysis Composite Structures Aeroelasticity Tuning Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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