Topic
Open-loop controller
About: Open-loop controller is a research topic. Over the lifetime, 16148 publications have been published within this topic receiving 224014 citations. The topic is also known as: non-feedback controller & open-loop control law.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the effects of turbine dynamics on the average system frequency behavior of a multi- generator system after a major generation loss or load change when the system remains in synchronism are modeled.
Abstract: This paper endeavors to model the effects of governor- turbine dynamics on the average system frequency behavior of a multi- generator system after a major generation loss or load change when the system remains in synchronism. The maximum frequency deviation and the time at which the maximum occurs are the main quantities of interest. Two independent concepts are presented to convert a closed-loop, high dimensional, nonlinear model into approximate, open-loop, low dimensional, linear ones (the delay and the canonical models). The delay model uses pure time delay to model "fast time constants" and valve motion and converts the closed loop model into an open loop one. The canonical model expresses the turbine reheats respo'nse as a linear combination of a set of "basis" functions and provides a basis for combining many machines into one simplified, low dimensional model. The two models can be implemented concurrently, to give a very large reduction in complexity when a multi-machine system is analyzed.
109 citations
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TL;DR: A feedback-feedforward control structure is proposed for precision motion control of a permanent magnet linear motor for applications which are inherently repetitive in terms of the motion trajectories.
Abstract: In this paper, with a modest amount of modeling effort, a feedback-feedforward control structure is proposed for precision motion control of a permanent magnet linear motor for applications which are inherently repetitive in terms of the motion trajectories. First, a proportional-integral-derivative (PID) feedback controller is designed using an automatic relay tuning method. An iterative learning controller based on zero-phase filtering is applied as feedforward controller to the existing relay-tuned PID feedback controller to enhance the trajectory tracking performance by utilizing the experience gained from the repeated execution of the same operations. Experimental results are presented to demonstrate the practical appeal and effectiveness of the proposed scheme.
108 citations
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TL;DR: Reheat turbine, Generation Rate Constraint (GRC) and time delay are included in the system model to demonstrate the ability of the proposed approach to handle nonlinearity and physical constraints in theSystem model.
108 citations
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31 Oct 2000TL;DR: The global asymptotic stability for the state feedback controller with gravity compensation is proven and Experimental results on the DLR light-weight robots validate the method.
Abstract: Addresses the problem of controlling the joints of a flexible joint robot with a state feedback controller and proposes a gradual way of extending such a controller towards feedback linearization. The global asymptotic stability for the state feedback controller with gravity compensation is proven. Experimental results on the DLR light-weight robots validate the method.
108 citations
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TL;DR: For certain specific problems, the different control schemes are analyzed and compared, and the vast superiority of feedback over open-loop control is demonstrated.
Abstract: : The optimal control of stochastic systems is considered. Under various assumptions concerning the information available to the controller, different optimal control rules result. For certain specific problems, the different control schemes are analyzed and compared, and the vast superiority of feedback over open-loop control is demonstrated.
108 citations