A magnetorheological fluid elastomeric (snubber) lag damper is developed to provide adaptive lead-lag damping augmentation for a hingeless helicopter rotor. The MR fluid elastomeric (MRFE) lag damper consists of a flow valve, a flexible snubber body, and a flexible center wall separating the body into two fluid chambers. MR fluid enclosed in the snubber body can flow through the valve and be activated by a magnetic field in the valve. Consistent with the loading conditions for a helicopter lag damper, the MRFE damper is tested under single frequency (lag/rev) sinusoidal excitation. The complex modulus method was used to compare the MRFE damper damping characteristics with a baseline passive snubber type Fluidlastic damper. The field-off damping of MRFE damper is smaller than the baseline damper. A significant controllable damping range is also observed as current was applied to a magnetic valve in the MRFE damper. Furthermore, the non-linear behavior of the MRFE damper is not sufficiently modeled using the complex modulus method. Thus, to account for the hysteresis behavior of the MRFE damper and estimate the damping force, a hydro-mechanical model is formulated based on lumped parameters. Parameters for the model are established using experimental data and a least-mean-square error minimization technique. The model is then applied to reconstruct the force time history under lag/rev excitation frequency. The average error between the predicted and measured damping forces is also evaluated to assess model accuracy.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A semi-active magnetorheological fluid snubber lag damper for a hingeless/bearingless helicopter


    Additional title:

    Ein semi-aktiver Stoßdämpfer mit magnetorheologischer Flüssigkeit für einen gelenklosen/lagerungsfreien Hubschrauber


    Contributors:


    Publication date :

    2009


    Size :

    13 Seiten, 27 Bilder, 11 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Adaptive Magnetorheological Snubber Lag Damper (MRSLD) for hingeless helicopter main rotor blades

    Ngatu, Grum T. / Hu, Wei / Wereley, Norman M. et al. | Tema Archive | 2008


    Adaptive Magnetorheological Snubber Lag Damper (MRSLD) for Hingeless Helicopter Main Rotor Blades

    Ngatu, G. / Hu, W. / Wereley, N. et al. | British Library Conference Proceedings | 2008


    Adaptive Snubber-Type Magnetorheological Fluid-Elastomeric Helicopter Lag Damper

    Ngatu, Grum T. / Hu, Wei / Wereley, Norman M. et al. | AIAA | 2010


    Adaptive snubber-type magnetorheological fluid-elastomeric helicopter lag damper

    Ngatu, Grum T. / Hu, Wei / Wereley, Norman M. et al. | Tema Archive | 2010