Closed-loop vibration control experiments on a rotor with blade mounted actuation
Closed-loop vibration control experiments on a rotor with blade mounted actuation
- New search for: Prechtl, E.F.
- New search for: Hall, S.R.
- New search for: Prechtl, E.F.
- New search for: Hall, S.R.
A Mach-scaled CH-47 model rotor blade with an actively controlled servo-flap near the tip was designed, manufactured, and tested. The servo-flap was powered by an 'X-Frame' piezoelectric actuator. Using hover test data, the transfer function of the rotor (from servo-flap deflection to vertical hub shear) was determined. The servo-flap produces significant control authority, especially near the 3/rev frequency that would be important for the CH-47. Closed-loop feedback control was experimentally applied to the model rotor system. Both single frequency and combined frequency controllers were implemented on the rotor, and produced significant reduction in the vibration level. Most significantly, simultaneous control of 1/rev, 3/rev, 4/rev, 5/rev, and 6/rev harmonic vibration was successfully demonstrated. The peak vibrations were eliminated at each frequency, as well as the vibrations over a small bandwidth surrounding each peak. Comparison of continuous-time and discrete-time controllers was made. Continuous-time controllers were shown to produce more effective vibration reduction.
Document information
Closed-loop vibration control experiments on a rotor with blade mounted actuation
2000
15 Seiten, 26 Quellen
Conference paper
English
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