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Dynamic response of active twist rotor blades
- Source :
- 41st Structures, Structural Dynamics, and Materials Conference and Exhibit.
- Publication Year :
- 2000
- Publisher :
- American Institute of Aeronautics and Astronautics, 2000.
-
Abstract
- Dynamic characteristics of active twist rotor (ATR) blades are investigated analytically and experimentally in this paper. The ATR system is intended for vibration and potentially for noise reductions in helicopters through individual blade control. An aeroelastic model is developed to identify frequency response characteristics of the ATR blade with integral, generally anisotropic, strain actuators embedded in its composite construction. An ATR prototype blade was designed and manufactured to experimentally study the vibration reduction capabilities of such systems. Several bench and hover tests were conducted and those results are presented and discussed here. Selected results on sensitivity of the ATR system to collective setting (i.e. blade loading), blade rpm (i.e. centrifugal force and blade station velocity), and media density (i.e. altitude) are presented. They indicated that the twist actuation authority of the ATR blade is independent of the collective setting up to approximately 10P, and dependent on rotational speed and altitude near the torsional resonance frequency due to its dependency on the aerodynamic damping. The proposed model captures very well the physics and sensitivities to selected test parameters of the ATR system. The numerical result of the blade torsional loads show an average error of 20% in magnitude and virtually no difference in phase for the blade frequency response. Overall, the active blade model is in very good agreement with the experiments and can be used to analyze and design future active helicopter blade systems.
- Subjects :
- Engineering
Frequency response
Materials science
Blade (geometry)
business.industry
Rotor (electric)
Rotational speed
Aerodynamics
Structural engineering
Condensed Matter Physics
Aeroelasticity
Atomic and Molecular Physics, and Optics
law.invention
Vibration
Mechanics of Materials
law
Signal Processing
General Materials Science
Electrical and Electronic Engineering
Helicopter rotor
Twist
business
Civil and Structural Engineering
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- 41st Structures, Structural Dynamics, and Materials Conference and Exhibit
- Accession number :
- edsair.doi.dedup.....07cfc4902a343eb1b200b5c39536aeda