摘要 :
Software tools have recently become available which significantly reduce effort in linear control law development. These tools allow for automatic tuning of controllers based on bandwidth and time response requirements, as well as...
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Software tools have recently become available which significantly reduce effort in linear control law development. These tools allow for automatic tuning of controllers based on bandwidth and time response requirements, as well as using traditional loop shaping methods. This paper presents a linear model of a T700 turboshaft engine, listing input and output and the units of each. Next closed loop control system requirements for gain, bandwidth and robustness are presented. The linear T700 engine coupled with rotor dynamics model is used as the plant model, and an uncertainty model' for the rotor dynamics is considered. This frequency dependent uncertainty model captures the fact that each engine will have slight variations due to manufacturing tolerances and different degradation levels due to various amounts of run time and different levels of aggressiveness in helicopter maneuvers. Fixed order H-Infinity controllers are designed meet closed loop specifications. The control laws are then tested in the time domain and frequency domain to verify specifications are met, and robustness is assessed.
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This paper considers design of a robust servosystem for a plant whose dynamics changes according to its operating conditions. The plant is described by a linear interpolation of proper stable coprime factorizations of transfer fun...
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This paper considers design of a robust servosystem for a plant whose dynamics changes according to its operating conditions. The plant is described by a linear interpolation of proper stable coprime factorizations of transfer functions of two representative models. Stabilization problems for such interpolated models have been extensively considered using fixed controllers, or applying interpolated controllers which are linear interpolations of coprime factorizations of two stabilizing controllers for the representative models. In this paper, we extend the results obtained by interpolated controllers to the design of a robust servosystem. We propose a two-degree-of-freedom controller which consists of interpolated feedback and feedforward compensators.
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This paper presents the frequency regulation in the hybrid distributed generation system (HDGS). Being a critical problem it directly affects the reliability and quality of the HDGS. Therefore a roboust controller is designed for ...
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This paper presents the frequency regulation in the hybrid distributed generation system (HDGS). Being a critical problem it directly affects the reliability and quality of the HDGS. Therefore a roboust controller is designed for the frequency regulation of HDGS. The proposed hybrid system consists of conventional thermal source and distributed generation resources including wind turbine, fuel cell, aqua electrolyzer, diesel engine generator and super capacitor. H-infinity (H∞) controller for frequency regulation, is considered using linear matrix inequalities. The robustness of this controller is presented for the proposed hybrid power system with varying load and wind power conditions. The performance of the proposed controller is verified by performing simulations.
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摘要 :
This paper presents the frequency regulation in the hybrid distributed generation system (HDGS). Being a critical problem it directly affects the reliability and quality of the HDGS. Therefore a roboust controller is designed for ...
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This paper presents the frequency regulation in the hybrid distributed generation system (HDGS). Being a critical problem it directly affects the reliability and quality of the HDGS. Therefore a roboust controller is designed for the frequency regulation of HDGS. The proposed hybrid system consists of conventional thermal source and distributed generation resources including wind turbine, fuel cell, aqua electrolyzer, diesel engine generator and super capacitor. H-infinity (H∞) controller for frequency regulation, is considered using linear matrix inequalities. The robustness of this controller is presented for the proposed hybrid power system with varying load and wind power conditions. The performance of the proposed controller is verified by performing simulations.
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摘要 :
There are a lot of studies on Robust Design which treat robustness only for objective function and/or for considering not to break constraints. But most likely, we would like to have solution which are unchanged even with small pe...
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There are a lot of studies on Robust Design which treat robustness only for objective function and/or for considering not to break constraints. But most likely, we would like to have solution which are unchanged even with small perturbation in design conditions such as design parameters. The word "Unchange" means results of the robust design which should be expressed as design variables keep unchanged with these perturbations. In this study, we treat these problems and shows basic difficulties and the method of robust design by thinking of the processes of optimization.
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摘要 :
The paper approaches the new branch of engineering, Robust Engineering, developed by G. Taguchi. His main contribution to engineering was the proposition of a given design plan subject to a set of uncontrolled variables that affec...
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The paper approaches the new branch of engineering, Robust Engineering, developed by G. Taguchi. His main contribution to engineering was the proposition of a given design plan subject to a set of uncontrolled variables that affect the process or product performances. The new levels of the controlled variables are set after estimating of the effects of the uncontrolled variable on the responses, via mathematical transform signal-to-noise-ratio. An application was shown.
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摘要 :
The paper approaches the new branch of engineering, Robust Engineering, developed by G. Taguchi. His main contribution to engineering was the proposition of a given design plan subject to a set of uncontrolled variables that affec...
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The paper approaches the new branch of engineering, Robust Engineering, developed by G. Taguchi. His main contribution to engineering was the proposition of a given design plan subject to a set of uncontrolled variables that affect the process or product performances. The new levels of the controlled variables are set after estimating of the effects of the uncontrolled variables on the responses, via mathematical transform signal-to-noise-ratio. An application was shown.
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摘要 :
The paper approaches the new branch of engineering, Robust Engineering, developed by G. Taguchi. His main contribution to engineering was the proposition of a given design plan subject to a set of uncontrolled variables that affec...
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The paper approaches the new branch of engineering, Robust Engineering, developed by G. Taguchi. His main contribution to engineering was the proposition of a given design plan subject to a set of uncontrolled variables that affect the process or product performances. The new levels of the controlled variables are set after estimating of the effects of the uncontrolled variables on the responses, via mathematical transform signal-to-noise-ratio. An application was shown.
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The problem of adaptive robust fault-tolerant control is investigated for the turbofan system with uncertainties, actuator faults and unknown disturbances in this paper. Disturbances are considered to be energy bounded, and the ac...
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The problem of adaptive robust fault-tolerant control is investigated for the turbofan system with uncertainties, actuator faults and unknown disturbances in this paper. Disturbances are considered to be energy bounded, and the actuator faults are the loss of effectiveness faults. A state-fault observer is devised to estimate the unmeasurable states and actuator faults. The energy bounded disturbances are suppressed using the
$H_{\infty}$
control method. Then, a reference mode adaptive robust control strategy is built via combining the reference mode control approach, the state-fault observer scheme and
$H_{\infty}$
control theory. By means of Lyapunov stability theory and linear matrix inequality method, some results are achieved that the turbofan system can track asymptotically the desired performance of the reference model under the designed controller. Finally, the simulation results indicate that the proposed method is robust and effective.
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摘要 :
The problem of adaptive robust fault-tolerant control is investigated for the turbofan system with uncertainties, actuator faults and unknown disturbances in this paper. Disturbances are considered to be energy bounded, and the ac...
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The problem of adaptive robust fault-tolerant control is investigated for the turbofan system with uncertainties, actuator faults and unknown disturbances in this paper. Disturbances are considered to be energy bounded, and the actuator faults are the loss of effectiveness faults. A state-fault observer is devised to estimate the unmeasurable states and actuator faults. The energy bounded disturbances are suppressed using the
$H_{\infty}$
control method. Then, a reference mode adaptive robust control strategy is built via combining the reference mode control approach, the state-fault observer scheme and
$H_{\infty}$
control theory. By means of Lyapunov stability theory and linear matrix inequality method, some results are achieved that the turbofan system can track asymptotically the desired performance of the reference model under the designed controller. Finally, the simulation results indicate that the proposed method is robust and effective.
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