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    ACTIVE VIBRATION ATTENUATING SEAT SUSPENSION FOR AN ARMORED HELICOPTER CREW SEAT

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    No. of downloads: 208

    Date
    2013
    Author
    Sztein, Pablo Javier
    Advisor
    Wereley, Norman M
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    Abstract
    An Active Vibration Attenuating Seat Suspension (AVASS) for an MH-60S helicopter crew seat is designed to protect the occupants from harmful whole-body vibration (WBV). Magnetorheological (MR) suspension units are designed, fabricated and installed in a helicopter crew seat. These MR isolators are built to work in series with existing Variable Load Energy Absorbers (VLEAs), have minimal increase in weight, and maintain crashworthiness for the seat system. Refinements are discussed, based on testing, to minimize friction observed in the system. These refinements include the addition of roller bearings to replace friction bearings in the existing seat. Additionally, semi-active control of the MR dampers is achieved using special purpose built custom electronics integrated into the seat system. Experimental testing shows that an MH-60S retrofitted with AVASS provides up to 70.65% more vibration attenuation than the existing seat configuration as well as up to 81.1% reduction in vibration from the floor.
    URI
    http://hdl.handle.net/1903/14185
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    • Aerospace Engineering Theses and Dissertations
    • UMD Theses and Dissertations

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