Accession Number : ADA294694

Title :   Individual Blade Control for Helicopter Rotor Blade One/Rev Vibration Reduction. Phase 1.

Descriptive Note : Final rept. 29 Sep 94-29 Mar 95,

Corporate Author : CONTINUUM DYNAMICS INC PRINCETON NJ

Personal Author(s) : McKillip, Robert M., Jr.

PDF Url : ADA294694

Report Date : 31 MAY 1995

Pagination or Media Count : 71

Abstract : Results of a Phase- SBIR study directed at the use of Individual Blade Control (IBC) for 1/rev helicopter rotor vibration reduction are described. Past approaches, analytical studies, and current technology for 1/rev vibration reduction are surveyed, and then a notional scheme for implementing an IBC-based control device using shape memory alloys (SMA) is introduced. In order to quantify the required performance from this scheme, investigations into the sources of 1/rev vibration, and possible methods for its control are simulated using an aeroelastic analysis. Actuation concepts using SMA wires are analyzed, with engineering support from limited benchtop conceptual test models. Finally, implementation issues are discussed, and a plan for continued work leading to prototype development for this system is outlined. The results from this Phase 1 study indicate that the proposed innovative scheme for providing active 1/rev vibration control for helicopter rotors should lead to a practical system, that would be developed and prototyped under a follow-on Phase 2 program. (AN)

Descriptors :   *VIBRATION, *HELICOPTER ROTORS, *ROTOR BLADES(ROTARY WINGS), TEST AND EVALUATION, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, REQUIREMENTS, FATIGUE LIFE, ACCELEROMETERS, PROTOTYPES, MOMENTS, ALLOYS, REDUCTION, AEROELASTICITY, HELICOPTERS, SHEAR STRESSES, AERODYNAMIC LOADING, FLAPS(CONTROL SURFACES), DYNAMIC LOADS, ACTUATORS, CONTROL THEORY, FLIGHT MANEUVERS, HOVERING, TRAILING CONTROL SURFACES.

Subject Categories : Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE