Whirl Flutter of Turboprop Aircraft Structures by Jiri Cecrdle

By Jiri Cecrdle

Whirl flutter is the aeroelastic phenomenon attributable to the coupling of plane propeller aerodynamic forces and the gyroscopic forces of the rotating plenty (propeller, fuel turbine engine rotor). it might happen at the turboprop, tilt-prop-rotor or rotorcraft plane buildings. Whirl Flutter of Turboprop airplane Structures explores the whirl flutter phenomenon, together with theoretical and useful in addition to analytical and experimental facets of the problem. the 1st introductory half offers a normal evaluate concerning aeroelasticity, by means of the actual precept and the incidence of whirl flutter in aerospace perform. the subsequent part bargains with scan study together with past actions played, relatively from the sixties, in addition to contemporary advancements. next chapters talk about analytical tools akin to uncomplicated and complicated linear versions, and non-linear and CFD dependent tools. ultimate chapters summarize certification concerns together with legislation requisites, an outline of attainable certification methods and a number of other examples of airplane certification from the aerospace perform. eventually, a database of appropriate books and stories is provided.

  • provides complicated details of turboprop plane whirl flutter phenomenon
  • presents either theoretical and sensible (certification similar) issues
  • presents experimental learn in addition to analytical versions (basic and complicated) of matter
  • includes either early-performed works and up to date developments
  • contains a list of proper books and reviews

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Extra resources for Whirl Flutter of Turboprop Aircraft Structures

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The propeller rotating in the windmilling mode was attached by the shaft through a hinge allowing pitch and yaw with adjustable flexibilities. The propeller blade angles were also changeable. Structural damping was simulated by means of removable rubber blocks. 5. The comparison of the experimental results with theory demonstrated that the theoretical aerodynamic derivatives underestimated the whirl flutter speed. 5 NASA propeller wind tunnel model [5] 45 Whirl Flutter of Turboprop Aircraft Structures (excluding the damping force due to the pitch) to the analytical solution made the solution much closer to the experimental results.

They were investigating the aerodynamic forces on the propeller – nacelle model and measured the whirl flutter characteristics. The propeller rotating in the windmilling mode was attached by the shaft through a hinge allowing pitch and yaw with adjustable flexibilities. The propeller blade angles were also changeable. Structural damping was simulated by means of removable rubber blocks. 5. The comparison of the experimental results with theory demonstrated that the theoretical aerodynamic derivatives underestimated the whirl flutter speed.

25 62 Four-blade prop-rotor model [19] Experimental research on whirl flutter results included the structure’s responses in certain combinations of parameters (windflow and rotor revolutions). A similar experiment on the three-blade gimballed windmilling prop-rotor is outlined by Mueller and co-workers in reference [19]. 26. 2 Tilt-rotor aircraft demonstrators The experimental activities performed on aircraft components or on complete models were connected especially with the development work of the specific aircraft type.

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