This study explores the use of magnetorheological (MR) dampers in a semiactive seat suspension system for helicopter crew seats to enhance occupant comfort. Key concepts in designing an MR seat suspension system to isolate the occupant from rotorcraft vibration are identified. Using these design concepts, an MR damper is designed, fabricated, and retrofitted into a tactical SH-60 Seahawk crew seat. This MR damper is implemented in series with the existing fixed load energy absorbers (FLEAs) such that the crashworthiness capability of the seat is not impaired. Semi-active control is implemented and performance is evaluated both analytically and experimentally. Experimental test results have shown that this system reduced the dominant rotor-induced vertical vibration (4 per rev) transmitted to a 50th percentile male aviator by 76 %, which is a 61 - 70 % improvement over the unmodified SH-60 crew seat depending upon whether a soft seat cushion is utilized. Furthermore, these experimental tests also show that this system significantly reduces vertically-induced seat rocking that occurs as a result of an offset center of gravity in the crew seat design.


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    Title :

    Semi-active magnetorheological helicopter crew seat suspension for vibration isolation


    Additional title:

    Halbaktive magnetorheologuischer Hubschrauberbesatzungssitzaufhängung zur Schwingungsisolation


    Contributors:


    Publication date :

    2007


    Size :

    15 Seiten, 16 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Semi-Active Magnetorheological Helicopter Crew Seat Suspension for Vibration Isolation

    Hiemenz, G. / Guptal, P. / Hu, W. et al. | British Library Conference Proceedings | 2008


    Semi-Active Magnetorheological Helicopter Crew Seat Suspension for Vibration Isolation

    Hiemenz, Gregory / Hu, Wei / Wereley, Norman | AIAA | 2007


    Dynamic Testing of a Semi-Active Magnetorheological Helicopter Crew Seat Suspension for Vibration Isolation

    Hiemenz, G. / Hu, W. / Wereley, N. et al. | British Library Conference Proceedings | 2009


    Dynamic testing of a semi-active magnetorheological helicopter crew seat suspension for vibration isolation

    Hiemenz, Gregory J. / Glass, William / Wereley, Norman et al. | Tema Archive | 2009