FILTER-ACCOMMODATED OPTIMAL CONTROL OF LARGE FLEXIBLE SPACE SYSTEMS

This paper considers the unknown (residual) mode problem of large space system (LSS) control and develops a filter-accommodated optimal control methodology that effectively copes with unknown high-frequency vibration modes. This new, optimal control and estimation algorithm allows the inclusion of designerspecified low-frequency filter dynamics in the control loop such as Tchebycheff or Butterworth, thus providing bandwidth control for the closed-loop system. The algorithm allows filter attenuation to begin within the control system bandwidth, the controller working essentially through the filter, and lower-order filters may be used to achieve the required degree of attenuation.

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