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Sensitivity in sampled-data systems

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1 Author(s)
Lindorff, D. ; Univ. of Connecticut, Storrs, Conn., USA

The sensitivity of sampled-data systems to plant variations and load disturbance is examined with reference to two fundamental configurations. It is shown that the sensitivity function of a sampled-data system containing no continuous feedback is theoretically limited if the plant possesses low-pass response characteristics. Since the limitation imposed by sampling can be removed by continuous feedback, consideration is given to a sampled-data system containing a continuous minor-loop feedback path. A sensitivity function is derived which measures the individual effectiveness of the inner and outer loops in desensitizing the system, thereby providing the basis for a realistic design approach. This sensitivity function is applied to a design example.

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Automatic Control, IEEE Transactions on  (Volume:8 ,  Issue: 2 )