A mathematical model of a six-degree-of-freedom (6-DOF) hexapod system for vibration isolation was derived in the discrete-time domain on the basis of the experimental data obtained from a satellite. Using a Box–Jenkins model structure, the transfer functions between six piezoelectric actuator input voltages and six geophone sensor output voltages were identified empirically. The transfer function matrix is symmetric, and its off-diagonal terms indicate the coupling among different input/output channels. Various multi-input multi-output (MIMO) control techniques such as Linear Quadratic Gaussian and were proposed for active vibration isolation in the broadband up to 100 Hz. The simulation results using these controllers obtain 13 and 8 dB vibration attenuation at 25 and 35 Hz, respectively.
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e-mail: wjkim@tamu.edu
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December 2005
Technical Briefs
Modeling and Multivariable Control Design Methodologies for Hexapod-Based Satellite Vibration Isolation
Alok Joshi,
Alok Joshi
Department of Mechanical Engineering,
Texas A&M University
, College Station, Texas 77843-3123, USA
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Won-jong Kim
Won-jong Kim
Department of Mechanical Engineering,
e-mail: wjkim@tamu.edu
Texas A&M University
, College Station, Texas 77843-3123, USA
Search for other works by this author on:
Alok Joshi
Department of Mechanical Engineering,
Texas A&M University
, College Station, Texas 77843-3123, USA
Won-jong Kim
Department of Mechanical Engineering,
Texas A&M University
, College Station, Texas 77843-3123, USAe-mail: wjkim@tamu.edu
J. Dyn. Sys., Meas., Control. Dec 2005, 127(4): 700-704 (5 pages)
Published Online: November 30, 2004
Article history
Received:
March 24, 2003
Revised:
November 30, 2004
Citation
Joshi, A., and Kim, W. (November 30, 2004). "Modeling and Multivariable Control Design Methodologies for Hexapod-Based Satellite Vibration Isolation." ASME. J. Dyn. Sys., Meas., Control. December 2005; 127(4): 700–704. https://doi.org/10.1115/1.2101842
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