NASA Technical Reports Server (NTRS) : SMART pdf

NASA Technical Reports Server (NTRS) : SMART

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Boeing and a team from Air Force, NASA, Army, Massachusetts Institute of Technology, University of California at Los Angeles, and University of Maryland have successfully completed a wind-tunnel test of the smart material actuated rotor technology (SMART) rotor in the 40- by 80-foot wind-tunnel of the National Full-Scale Aerodynamic Complex at NASA Ames Research Center, figure 1. The SMART rotor is a full-scale, five-bladed bearingless MD 900 helicopter rotor modified with a piezoelectric-actuated trailing-edge flap on each blade. The development effort included design, fabrication, and component testing of the rotor blades, the trailing-edge flaps, the piezoelectric actuators, the switching power amplifiers, the actuator control system, and the data/power system. Development of the smart rotor culminated in a whirl-tower hover test which demonstrated the functionality, robustness, and required authority of the active flap system. The eleven-week wind tunnel test program evaluated the forward flight characteristics of the active-flap rotor, gathered data to validate state-of-the-art codes for rotor noise analysis, and quantified the effects of open- and closed-loop active-flap control on rotor loads, noise, and performance.

The test demonstrated on-blade smart material control of flaps on a full-scale rotor for the first time in a wind tunnel. The effectiveness and the reliability of the flap actuation system were successfully demonstrated in more than 60 hours of wind-tunnel testing. The data acquired and lessons learned will be instrumental in maturing this technology and transitioning it into production. The development effort, test hardware, wind-tunnel test program, and test results will be presented in the full paper

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 9/22/2009
• Year: 2009
• Book Topics/Themes: NASA Technical Reports Server (NTRS), BEARINGLESS ROTORS, ROTARY WINGS, ROTOR AERODYNAMICS, SMART MATERIALS, HORIZONTAL FLIGHT, FLIGHT CHARACTERISTICS, ACTIVE CONTROL, FEEDBACK CONTROL, WIND TUNNEL TESTS, LOADS (FORCES), RELIABILITY, TRAILING EDGE FLAPS, Lau, Benton H., Straub, Friedrich, Anand, V. R., Birchette, Terry

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