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A parametric solution to the pole assignment problem using dynamic output-feedback
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DOI：10.1109/9.920789.png)
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A new technique is presented for pole placement of linear time-invariant systems using dynamic feedback. A recently developed method for partial pole assignment using constant feedback is generalized to the dynamic output-feedback case. Subject to a mild assumption on the number of complex conjugate poles to be assigned, it is almost always possible to arbitrarily assign all the closed-loop system poles using a compensator of order T[(n - phi) / max(m, l)] using this new method. Here, n, m, and l are the order of the system, and the number of inputs and outputs, respectively, and [GRAPHICS] where [x] denotes the nearest integer lower than or equal to a: (i.e., floor (x)), and [x] denotes the nearest integer greater than or equal to x (i.e., ceiling (x)), An equivalent result is that using a compensator of order q, it is almost always possible to arbitrarily assign min(n + q, (max(m, l) + l)q + phi) closed-loop system poles. Only the normal procedures of linear algebra are required to implement the technique. Note that phi greater than or equal to l + m - 1 and, therefore, the result is stronger than previous exact pole assignment results. Since it does not involve iteration or any other numerical techniques, it is possible to implement the method symbolically and, therefore, to obtain general parametric solutions to the pole assignment problem. The freedom in this design approach can also often be used to guarantee the internal stability and/or robustness of the resulting closed-loop system.
Keyword:
dynamic output feedback
pole assignment
pole retention
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7
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1.3W
被引数:
6.7W
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