Download e-book for iPad: Advanced Strategies in Control Systems with Input and Output by Sophie Tarbouriech, Germain Garcia, Adolf H. Glattfelder

By Sophie Tarbouriech, Germain Garcia, Adolf H. Glattfelder

ISBN-10: 3540370099

ISBN-13: 9783540370093

Physical, defense or technological constraints set off that the keep an eye on actuators can neither supply limitless amplitude indications nor limitless velocity of response. The keep an eye on difficulties of strive against plane prototypes and satellite tv for pc launchers provide attention-grabbing examples of the problems because of those significant constraints.

Neglecting actuator saturations on either amplitude and dynamics could be resource of bad or perhaps catastrophic habit for the closed-loop approach (such as loosing closed-loop stability).

Such actuator saturations have additionally been blamed as among the unlucky mishaps resulting in the 1986 Chernobyl nuclear strength plant catastrophe. For those purposes, the research of the keep an eye on challenge (its constitution, functionality and balance research) for platforms topic to either amplitude and expense actuator or sensor saturations as normal constraints has acquired the eye of many researchers within the final years.

The various ideas defined in the course of the e-book are really appealing for business purposes not just in aeronautical or area domain names but in addition within the context of organic platforms area. Such equipment are well matched for the improvement of instruments that support engineers to resolve research and synthesis difficulties within the context of regulate structures with enter and output constraints

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Additional info for Advanced Strategies in Control Systems with Input and Output Constraints

Example text

System response with anti-windup to step changes of approximately 840 Amps in rIi , for i = 1, . . 1 sec (rZ = 0 and v = 0). High gain Ku , δ > 0. the physical limits. The β(xu ) = 1 value (Figure 10-e) shows the intervention of the anti-windup compensator in order to keep the unstable mode inside χlower . It is possible to note that in this case the unstable mode (Figure 10-f) gets really close to the boundary of the controllable region and it requires a great effort from the anti-windup compensator, manifested in the shape of input signal u (Figure 10-b), to return it to the safe region.

The prevention of windup effects due to input magnitude restrictions is the subject of a great variety of papers. The references in [3], [8] and [26] give a good overview of the existing literature. Controllers with badly damped or unstable modes tend to “wind up” during input saturation, giving rise to big overshoots and slowly settling transients. Since these effects are related to the dynamics of the controller, they are called controller windup [15]. Most of the early windup literature was devoted to the prevention of this kind of windup.

Nucoils j=1 (43) (44) (45) (46) (47) (48) |Euj | Observer: The stability of the anti-windup scheme is guaranteed when the unstable mode is directly measured [29]. When there is no such direct measurement, a bad estimation of the unstable mode can prevent the anti-windup compensator to stabilize the system. A high gain observer is required in this case to ensure that the estimation is fast enough to prevent any excursion of the unstable mode outside the controllable 20 Eugenio Schuster, Michael Walker, David Humphreys, and Miroslav Krsti´c region.

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Advanced Strategies in Control Systems with Input and Output Constraints by Sophie Tarbouriech, Germain Garcia, Adolf H. Glattfelder

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