A New Design for Adaptive Discrete-Time Repetitive
| Autor: | Chien-Jen Lin, 林建任 |
|---|---|
| Rok vydání: | 2001 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 89 This thesis presents a new method for designing a discrete-time repetitive controller and applies the technique of the adaptive notch filter for estimating the period of a periodic signal. The resulting system after integration of the above two techniques forms an adaptive discrete-time repetitive controller. The repetitive controller serves mainly as a compensator, plugged into a control system, with the purpose to remove or track a periodic signal, which arises from the desired reference signal or the undesired disturbance. Conventional approaches design a repetitive controller focusing on how to ensure the stability of the resulting system. Hence the designed repetitive controller is usually difficult to implement, its performance is not quantified and thus is not optimum. To avoid this drawback, we define a new criterion and use this criterion to design a discrete-time repetitive controller which is not only optimum in the sense of the criterion but also simple for realization. The usefulness of the new design criterion and approach is further verified by simulations in design examples using the servo motor and disk file actuator system. In most practical systems, the period of a periodic signal is commonly unknown. We propose, in this thesis, to use an adaptive notch filter for estimating the signal period. This adaptive system integrates with the discrete-time repetitive controller, yielding an adaptive discrete-time repetitive controller. Successful results are obtained from simulation of the whole system in several examples. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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