This is the final report describing the objectives and accomplishments of the research conducted under the above referenced grant. The general purpose of this grant has been to study a novel approach to active vibration control in helicopter fuselages known as the Active Control of Structural Response (ACSR) approach. In this approach vibrations in the helicopter fuselage are reduced by introducing harmonically varying forces by actuators located between the rotor and the fuselage such that the sum of the response of the airframe, due to rotor loads and external excitation, is reduced to a minimum. The primary objectives of this research were: (1) development of a coupled rotor/flexible fuselage model capable of simulating the vibrations in the fuselage and their control using the ACSR system, (2) modeling of the closed loop vibration reduction using two different control algorithms, a simple algorithm denoted the BACSR-algorithm, and a more refined algorithm based upon the internal model principle, denoted as the IMP-algorithm, and (3) conduct trend studies, to demonstrate vibration reduction throughout the flight envelope of the helicopter. All the objectives stated were achieved in the course of the research. Reduction of vibration levels below 0.04g was demonstrated throughout the ffight envelope, with relatively modest control effort, and low control power requirements. This research also provided a fundamental understanding of the approach that was not available from the experimental and empirical studies conducted before.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Fundamental Study of Active Vibration Control in Rotorcraft Using the ACSR Approach


    Beteiligte:

    Erscheinungsdatum :

    1997


    Format / Umfang :

    12 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch






    Vibration Reduction in Rotocraft Using an Enhanced ACSR Model

    Cribbs, R. / Friedmann, P. P. / American Institute of Aeronautics and Astronautics et al. | British Library Conference Proceedings | 2000


    ACTIVE VIBRATION CONTROL OF A ROTORCRAFT

    WELSH WILLIAM A / WEINER STEVEN D / BLACKWELL ROBERT H JR | Europäisches Patentamt | 2022

    Freier Zugriff

    ACTIVE VIBRATION CONTROL OF A ROTORCRAFT

    WELSH WILLIAM A / WEINER STEVEN D / BLACKWELL JR ROBERT H | Europäisches Patentamt | 2017

    Freier Zugriff