Acceleration feedback in the control of flexible structures / author: P.C. Hughes ; prepared by: Dynacon Enterprises Ltd.: Co24-3/1-83-023E-PDF

"The use of accelerometers as sensing elements for the control of large flexible space structures is explored. It is shown that, in addition to ordinary measurement error, the forces and torques on the vehicle produce additional direct errors in accelerometer interpretation. The portion of this additional error due to known forces and torques can be eliminated by feedforward within the control system. Moreover, because the interpretation of accelerometer outputs in terms of displacement and displacement-rate requires the structural math model itself, a still further source of control system error arises: parameter errors in the structural dynamics model used by the control system designer. This is examined in detail in this report for four types of control system design: simple (static) state feedback, simple (static) measurement feedback, state feedback based on a state vector estimated by a full-order state estimator, and state feedback based on a state vector estimated by a reduced-order (in fact, minimal order) state estimator. With these considerations in mind, and the theory in this report for guidance, additional numerical and simulation work can show quantitatively what the benefits and limitations of accelerometers are in specific situations"--Summary.

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