Vibration, noise, and aerodynamic design compromises are primary barriers to further improvements in effectiveness of the helicopter. The MD900 light utility helicopter main rotor system is modified to include in-blade smart material actuation for active control. A piezoelectric (PE)-driven trailing edge flap is used for vibration, noise, and aerodynamic performance improvements. A shape memory alloy (SMA)-driven trailing edge trim tab is used for in-flight blade tracking. Sizing and conceptual design of an active flap and trim tab system for the MD900 helicopter were completed. Several two-dimensional airfoil and flap/tab models were wind tunnel tested and an aerodynamic database was established. Structural samples of the flap actuator mounts, flap section, tab, and full-span flap were fabricated and successfully tested. Several prototype actuators were developed and extensively tested to establish their performance and robustness in the dynamic operating environment. The flap actuator uses two biaxial PE stack columns, operating in a push-pull mode, a column mid-support, and a stroke amplification mechanism. The tab actuator uses two biaxial SMA tubes for actuation/bias, an SMA-activated lock for power-off operation, and integrated microprocessor control electronics. Results to date confirm that smart material in-blade active control of a rotor is feasible and offers significant performance and cost benefits. Projected payoffs from reduced vibrations and noise as well as in-flight tracking include improved component lives, reduced maintenance and improved crew, passenger, and community acceptance.


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    Titel :

    Smart Material-actuated Rotor Technolnnogy - SMART


    Beteiligte:
    Straub, Friedrich K. (Autor:in) / Kennedy, Dennis K. (Autor:in) / Domzalski, David B. (Autor:in) / Hassan, Ahmed A. (Autor:in) / Ngo, Hieu (Autor:in) / Anand, V. (Autor:in) / Birchette, Terry (Autor:in)


    Erscheinungsdatum :

    2004


    Format / Umfang :

    12 Seiten, 21 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    Smart material actuated rotor technology - SMART

    Straub, Friedrich / Kennedy, Dennis / Domzalski, David et al. | AIAA | 2000


    Whirl Tower Test and Analysis of the Smart Material Actuated Technology (SMART) Active Flap Rotor

    Straub, F. / AHS International | British Library Conference Proceedings | 2007


    Aeromechanic Considerations in the Design of a Rotor with Smart Material Actuated Trailing Edge Flaps

    Straub, F. K. / Hassan, A. | British Library Conference Proceedings | 1996


    Smart rotor: controlling dynamic stall by means of an actuated flap

    Raiola, Marco / Ianiro, Andrea / Discetti, Stefano et al. | AIAA | 2016


    Micropumps Actuated by Smart Materials

    Song, G. / Fan, B. / Hussain, F. et al. | British Library Conference Proceedings | 2004