Hierarchical HAC /LAC vibration suppression for a flexible space telescope: SPICE

Armando Rodriguez, Delano R. Carter

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


This paper describes the synthesis of a dynamic compensator for a flexible space telescope described by a 280th order finite-element NASTRAN-based model. The control objective is to attenuate the induced LOS jitter by a factor of 40 dB over the open loop value. A combination of Low Authority Control (LAC) followed by High Authority Control (HAC ) which utilizes the H optimal control methodology make up the hierarchical control system developed in this paper. The final design is shown to offer the required performance and robustness. The LAC loop is made up of two loops which provide broadband modal damping, modal spillover robustness, and actuator mode stabilization; all of which help in the design of the HAC . The HAC loop controller order is reduced from 130-states to 60-states by applying frequency-weighted balanced truncation techniques. The resulting hierarchical HAC /LAC controller is robustly stable against ±10% variation in actuator and sensor modeling.

Original languageEnglish (US)
Title of host publicationProceedings of the American Control Conference
PublisherAmerican Automatic Control Council
Number of pages5
StatePublished - 1994
EventProceedings of the 1994 American Control Conference. Part 1 (of 3) - Baltimore, MD, USA
Duration: Jun 29 1994Jul 1 1994


OtherProceedings of the 1994 American Control Conference. Part 1 (of 3)
CityBaltimore, MD, USA

ASJC Scopus subject areas

  • Control and Systems Engineering


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