Title: A 'Kane's dynamics' model for the active rack isolation system. Part four: a model for optimal controller design

Authors: R. David Hampton, Naveed Quraishi, Geoffrey S. Beech

Addresses: Civil and Mechanical Engineering Department, US Military Academy, West Point, New York 10996, USA. ' NASA Goddard Space Flight Center (GSFC 3230), 8800 Greenbelt Road, Greenbelt, Maryland 20771, USA. ' Vehicle Analysis Branch (Mail Stop: EV12), Spacecraft and Vehicle Systems Department, NASA Marshall Space Flight Center, Huntsville, Alabama 35812, USA

Abstract: Boeing|s active rack isolation system (ARIS) isolates microgravity space-science experiments on the international space station (ISS) against station-induced disturbances, at the level of the international standard payload rack (ISPR). Part 1 of this documentation presented a linearised model of ARIS, hand-developed via Kane|s method. Part 2 reported the use of software packages to develop and verify a corresponding non-linear model, without umbilicals. Part 3 documented the augmentation of the non-linear model with an arbitrary number of umbilicals, with specified arbitrary attachment points, and arbitrary (parallel) stiffnesses and dampings. Part 4 reviews the general model-development procedure; reports on the reformulation of the model into a standard, linearised, input-coupled, state-space (descriptor) form, with all bias-force and -moment terms removed; summarises the significant features of the completed model; and discusses its possible uses in support of future microgravity vibration-isolation efforts.

Keywords: modelling; simulation; Kanes dynamics; microgravity; ISS; international space station; ARIS; active rack isolation systems; controller design; optimal design; vehicle systems; Boeing; vibration isolation.

DOI: 10.1504/IJVSMT.2009.029176

International Journal of Vehicle Systems Modelling and Testing, 2009 Vol.4 No.1/2, pp.43 - 54

Published online: 08 Nov 2009 *

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