Development of a smart trailing-edge flap actuator with multistage stroke amplifier for a rotor blade

Taeoh Lee; Inderjit Chopra

doi:10.1117/12.388822

22 June 2000 Development of a smart trailing-edge flap actuator with multistage stroke amplifier for a rotor blade

Taeoh Lee, Inderjit Chopra

Proceedings Volume 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems; (2000) https://doi.org/10.1117/12.388822
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

The present research experimentally investigates the feasibility of a trailing-edge flap mechanism actuated in a helicopter rotor by piezoelectric stacks in conjunction with a dual-stage mechanical stroke amplifier to actively control vibration. A new mechanical leverage amplification concept was developed to extend the capability of a simple lever-fulcrum stroke amplifier. A refined prototype actuator and flap mechanism were designed and fabricated using five piezostacks. The bench-top test of the actuator showed 73.7 mils of free stroke and uniform displacement output up to a frequency of 150 Hz. Spin testing was performed in the vacuum chamber to evaluate the performance in rotating environment, and the refined prototype actuator showed approximately 13% loss in actuation stroke at 710 g of full-scale centrifugal loading. In the Open-Jet wind tunnel testing to simulate the aerodynamic loading environment, the peak-to-peak flap deflections above 8 degrees for freestream velocity of 120 ft/sec were obtained at different excitation frequencies. It demonstrated the capability of the refined prototype actuator in rotating environment to potentially reduce helicopter vibration.

Citation Download Citation

Taeoh Lee and Inderjit Chopra "Development of a smart trailing-edge flap actuator with multistage stroke amplifier for a rotor blade", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); https://doi.org/10.1117/12.388822

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