A U.S. Air Force-sponsored team has developed technology to reduce the vibration felt by an isolated payload during launch. Spacecraft designers indicate that a launch vibration isolation system (LVIS) could provide significant cost benefits in payload design, testing, launch, and lifetime. This paper contains developments occurring since those reported previously. Simulations, which included models of a 6,500 pound spacecraft, an isolating payload attach fitting (PAF) to replace an existing PAF, and the Boeing Delta II launch vehicle, were used to generate PAF performance requirements for the desired levels of attenuation. Hardware was designed to meet the requirements. The isolating PAF concept replaces portions of a conventional metallic fitting with hydraulic-pneumatic struts featuring a unique hydraulic cross-link feature that stiffens under rotation to meet rocking restrictions. The pneumatics provide low-stiffness longitudinal support. Two demonstration isolating PAF struts were designed, fabricated and tested to determine their stiffness and damping characteristics and to verify the performance of the hydraulic cross-link concept. Measurements matched analytical predictions closely. An active closed-loop control system was simulated to assess its potential isolation performance. A factor of 100 performance increase over the passive case was achieved with minor weight addition and minimal power consumption.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Passive and active launch vibration studies in the LVIS program


    Beteiligte:
    Edberg, D.L. (Autor:in) / Bartos, B. (Autor:in) / Goodding, J. (Autor:in) / Wilke, P. (Autor:in) / Davis, T. (Autor:in)


    Erscheinungsdatum :

    1998


    Format / Umfang :

    12 Seiten, 2 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    On the design and testing of a spacecraft launch vibration isolation system (LVIS)

    Wilke, P. / Fosness, Eugene / Davis, T. et al. | AIAA | 1997


    Performance/Sizing Tradeoffs in Active and Passive Launch Isolation

    Cunningham, D. C. / Wright Laboratory; U.S.; Flight Dynamics Directorate | British Library Conference Proceedings


    Semi- Active Vibration Isolation System for Launch Vehicles

    Iwamoto, K. / Noda, K. / Suzuki, T. et al. | British Library Conference Proceedings | 2004