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检索条件"主题词=Control Algorithms"

共 697 条记录，以下是191-200 订阅

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PD-PD TYPE LEARNING control FOR UNCERTAIN NONLINEAR SYSTEMS

PD-PD TYPE LEARNING CONTROL FOR UNCERTAIN NONLINEAR SYSTEMS

引用

ASME International Design Engineering Technical Conferences/Computers and Information in Engineering Conference

作者： Ouyang, P. R. Ryerson Univ Dept Aerosp Engn Toronto ON Canada

ISBN: (纸本)9780791849019

In this paper, a new learning control, called PD-PD type learning control, is proposed for trajectory tracking of nonlinear systems with uncertainty and disturbance. In the developed control scheme, a PD feedback control with the current tracking errors and a PD type iterative learning control using the previous tracking errors are combined in the updating law. Explicit expressions have been developed for choosing the feedback control gains and the iterative learning gains, and an initial updating scheme is proposed to reduce and eliminate initial errors from iteration to iteration. It is proven that the final tracking error is guaranteed to converge toward the desired trajectory in the presence of varying uncertainty, disturbance, and initial errors. Comparing with the traditional iterative learning control, the new algorithm has potential benefits that include: fast convergence rate, more flexible choices of the learning gains, and monotonic convergence of the tracking error. The effectiveness of the proposed learning control method is demonstrated by simulation experiments. Due to the straightforward implementation and very good trajectory performance of the proposed control algorithm, it should be highly applicable to industrial systems.

关键词： Iterative learning control Trajectories (Physics) Uncertainty algorithms control algorithms Simulation experiments Nonlinear systems Feedback Errors

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New Simulink control Block for Single Phase Shunt Active Power Filters

New Simulink Control Block for Single Phase Shunt Active Pow...

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8th International Symposium on Advanced Topics in Electrical Engineering (ATEE)

作者： Adam, George Zbant (Adam), Andreea Livint, Gheorghe Tech Univ Iasi Iasi Romania

ISBN: (纸本)9781467359801;9781467359795

Harmonic distortion introduced by nonlinear loads in the electric system is hard to measure and anticipate, and the effects are harmful to other loads. To compensate these drawbacks, usually active power filters are used, but their performance depends on the method used to generate the reference current, and on the parameters of the filter. This paper presents a new Matlab Simulink control block which allows the rapid tuning of filter's parameters, enables the selection of one of the six most usual control algorithms, and also can generate code for future implementation on microcontrollers.

关键词： active power filters control algorithms Simulink control block

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Principles of Mobile Walking Robot control in Scope of Technical Monitoring Tasks 12th

Principles of Mobile Walking Robot Control in Scope of Techn...

引用

12th International Conference on Dependability and Complex Systems (DepCoS-RELCOMEX)

作者： Radomskyi, Oleksandr Natl Aerosp Univ KhAI 17 Chkalova St UA-61070 Kharkov Ukraine

ISBN: (纸本)9783319594156;9783319594149

The article describes control synthesis for mobile walking robot, which has an interval mathematical model. We proposed proof of concept for mobile walking robot, carrying load up to sixty percents of robot's mass. control system includes a computing unit, seven servos, a three-axis accelerometer and a moving camera operating in a visible optical range. Results of interval algorithms synthesis are shown for robot as an object of automatic control (OAC), with interval mathematical model. We defined the operational mode range of the system, its structure and interval parameters of mathematical model. It is shown that setting of interval values allows adequate modeling and description of processes in dynamic systems such as mobile walking robots. Main goal of this paper is to show possibility of classical Bode Diagram modification and application for the synthesis of interval control.

关键词： control algorithms Mobile walking robot Four legged robot Interval model Bode Diagram

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Using fractional derivatives in joint control of hexapod robots

Using fractional derivatives in joint control of hexapod rob...

引用

2nd Workshop on Fractional Differentiation and Its Applications (FDA ' 06)

作者： Silva, Manuel F. Machado, J. A. Tenreiro Barbosa, Ramiro S. Inst Engn Porto Dept Elect Engn P-4200072 Oporto Portugal

This article studies several Fractional Order control algorithms used for joint control of a hexapod robot. Both Pade and series approximations to the fractional derivative are considered for the control algorithm. The walking performance is evaluated through two indices: The mean absolute density of energy used per unit distance travelled, and the control effort. A set of simulation experiments reveals the influence of the different approximations upon the proposed indices. The results show that the fractional proportional and derivative algorithm, implemented using the Pade approximation with a small number of terms, gives the best results.

关键词： robotics locomotion control algorithms fractional calculus performance analysis

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ROBUST ACTIVE FLOW control OF A STATOR CASCADE WITH INTEGER control FUNCTIONS AND SUM-UP ROUNDING

ROBUST ACTIVE FLOW CONTROL OF A STATOR CASCADE WITH INTEGER ...

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ASME Turbo Expo: Turbomachinery Technical Conference and Exposition

作者： Neuhaeuser, Karl King, Rudibert Tech Univ Berlin Dept Proc Engn Chair Measurement & Control Hardenbergstr 36a D-10623 Berlin Germany

ISBN: (纸本)9780791858554

This work is part of a research initiative that aims at increasing the overall gas turbine efficiency by means of constant volume combustion (CVC). For that purpose, flow control in the compressor becomes important, since unsteady combustion effects that may occur in a CVC are very likely to affect stability and efficiency of the compressor negatively due to flow disturbances. Active Flow control (AFC) often has to deal with uncertain flow conditions, e.g., due to turbulence, varying operating ranges, or simply environmental effects. By that, system parameters such as gain or time constants of the system model also become uncertain, making it difficult for control algorithms to ensure optimality or even stable behavior. Robust control in the sense of Ye. control tackles these problems using an uncertainty description and a nominal model of the system. In this contribution, robust control applied to a linear stator cascade is addressed when only a binary control output from solenoid valves is available. Moreover, a surrogate control variable is proposed, describing the extent of the velocity deficit. By means of a principal component analysis, this control variable is reconstructed from a single measurement input. AFC is realized via trailing edge blowing. In comparison to proportional valves, solenoid valves are cheaper and offer faster switching times with the drawback of a restricted range of the control output to integer or even binary values. Since the AI. controller, as well as most other control algorithms, results in a real-valued signal u(t) E ilk, a sum-up rounding strategy is applied to the controller output, forming a binary control output u(b)(t) is an element of {0,1}. Although it is impossible for the two outputs to completely match, unless both are integer-valued, there is proof that the difference of real-valued to binary output is bounded in its integral value. The investigations show that a switching frequency of the valves of 100 Hz is sufficient

关键词： Cascades (Fluid dynamics) Flow control Stators Valves Robust control control algorithms Compressors Flow (Dynamics) Combustion control equipment Solenoids Turbulence Proportional valves Gas turbines Uncertainty Principal component analysis Signals Stability Errors

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Numerical Simulation of control Strategies at Mutriku Wave Power Plant 37

Numerical Simulation of Control Strategies at Mutriku Wave P...

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37th ASME International Conference on Ocean, Offshore and Arctic Engineering

作者： Fay, Francois-Xavier Kelly, James Henriques, Joao Pujana, Ainhoa Abusara, Mohammad Mueller, Markus Touzon, Imanol Ruiz-Minguela, Pablo Tecnalia R&I Derio Spain Univ Basque Country UPV EHU DISA Bilbao Spain Univ Coll Cork MaREI Cork Ireland Inst Super Tecn IDMEC Lisbon Portugal Exeter Univ CEMPS Math Penryn England Univ Basque Country UPV EHU Dept Mech Engn Bilbao Spain

ISBN: (纸本)9780791851319

In order to de-risk wave energy technologies and bring confidence to the sector, it is necessary to gain experience and collect data from sea trials. As part of the OPERA H2020 project, the Mutriku Wave Power Plant (MWPP) is being used as a real condition laboratory for the experiment of innovative technologies. The plant is situated in the North shore of Spain and has been operating since 2011. It uses the Oscillating Water Column (OWC) principle, which consists in compressing and expanding the air trapped in a chamber due to the inner free-surface oscillation resulting from the incident waves. The pressure difference between the air chamber and the atmosphere is used to drive an air turbine. In that case, a self-rectifying air turbine is the best candidate for the energy conversion, as it produces a unidirectional torque in presence of a bi-directional flow. The power take-off system installed is composed of a biradial turbine connected to a 30kW off-the-shelf squirrel cage generator. One of the novelties of the turbine is a high-speed stop valve installed close to the rotor. The valve may be used to control the flow rate through the turbine or for latching control. This paper focuses on the development, the implementation and the numerical simulation of five control strategies including turbine speed and generator torque controllers. The algorithms were designed thanks to a numerical model describing one of the OWC chambers of the Mutriku power plant. Numerical results are presented for a variety of sea states and a comparison between the proposed control laws in terms of energy production and power quality is performed.

关键词： Wave energy Oscillating Water Column Wave-to-Wire model control algorithms torque control Reinforcement earning Model Predictive control

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Fuzzy Algorithm control Effectiveness on Drum Boiler Simulated Dynamics

Fuzzy Algorithm Control Effectiveness on Drum Boiler Simulat...

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36th International Conference on Telecommunications and Signal Processing (TSP)

作者： Pelusi, Danilo Vazquez, Luis Diaz, David Mascella, Raffaele Univ Teramo Dipartimento Sci Comunicaz Teramo Italy Univ Oriente Dept Automat Control Santiago De Cuba Cuba

ISBN: (纸本)9781479904020;9781479904037

The optimal control of parameters in a system assumes an important role in industrial processes. Models based on boiler-turbine plant are proposed in various applications. The target of this paper is to apply intelligent techniques on a boiler simulator to improve the speed and precision of control. In order to release such task, genetic-fuzzy controllers able of tuning the time duration of specific boiler drum signals, are designed. The results show good precision and relevant speed of control system improving the control performances of classical control structures.

关键词： Drum boiler fuzzy controller control algorithms Genetic algorithms

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control STRATEGY FOR A POINT-ABSORBER WAVE ENERGY CONVERTER 38

引用

38th ASME International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2019)

作者： Li, Qiao Murai, Motohiko Univ Tokyo Inst Ind Sci Kashiwa Chiba Japan Yokohama Natl Univ Dept Environm & Syst Sci Yokohama Kanagawa Japan

ISBN: (纸本)9780791858882

Linear driving wave energy converter (WEC) system need to control the electric generator to obtain more power generation. Electric power is consumed by control, but it is possible to control the natural period of the floating motion. By resonating the movement of the float part with wave, it is possible to obtain the power generation more than the control power consumption, the total power generation performance will be improved. In this study, to ensure the WEC safety and performance for various wave condition, especially high wave height, the electrical control algorithms are changed for different wave condition. A control strategy is proposed for various wave condition considering the control force limitation and motion amplitude limitation. Basis on the control strategy, the range of operation by electric control is estimated. In addition, by estimating the expected value of power generation in the set sea, the setting parameters of the WEC can be discussed according to the wave situation.

关键词： Wave energy converters Waves Energy generation Energy consumption Generators Seas control algorithms Electricity (Physics) Safety

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DEVELOPMENT OF THE INDEPENDENT METERING VALVE control SYSTEM AND ANALYSIS OF ITS PERFORMANCE FOR AN EXCAVATOR

DEVELOPMENT OF THE INDEPENDENT METERING VALVE CONTROL SYSTEM...

引用

BATH/ASME 2016 Symposium on Fluid Power and Motion control

作者： Lee, Jong-Chan Jin, Ki-Chang Kwon, Young-Min Choi, Lim-Gook Choi, Jae-Yoon Lee, Byung-Kyu Hyundai Heavy Ind Construct Equipment Res Inst Yongin Ulsan South Korea Hyundai Heavy Ind Construct Equipment Div Ulsan Ulsan South Korea

ISBN: (纸本)9780791850060

As an effort to develop more efficient system for an excavator, EH(Electro-Hydraulic) system has been widely adopted to take the advantage of the well-commercialized EH valves and its control technologies[1]. Utilizing the EH technology, an innovative IMV(Independent Metering Valve) control system for an excavator mechanism, which consists of high capacity EH valve blocks, an electric-controlled pump, and a main controller unit, has been developed by Hyundai Heavy Industries Co., Ltd. This IMV control system can provide tremendous flexibility to the control of cylinder movements and reduce the energy consumption of an excavator. In this paper, we introduce the major features of the developed IMV control system and propose the novel control algorithm considering optimal power distribution and energy saving. Furthermore, the effectiveness of the proposed system and control algorithm is verified through various experiments conducted on an excavator equipped with the IMV control system. The results are compared with those of conventional machine. It was shown that IMV system could save the energy consumption more than 10% of an excavator.

关键词： control algorithms Machinery control equipment control systems Valves Trenching machinery Pumps Energy consumption Cylinders

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Simplex Sliding Mode control Strategies for Spacecraft Rendezvous Maneuvers

Simplex Sliding Mode Control Strategies for Spacecraft Rende...

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20th World Congress of the International-Federation-of-Automatic-control (IFAC)

作者： Capello, Elisa Punta, Elisabetta Bartolini, Giorgio Politecn Torino Dept Mech & Aerosp Engn CNR IEHT Corso Duca Abruzzi 24 I-10129 Turin Italy Politecn Torino CNR IEHT Corso Duca Abruzzi 24 I-10129 Turin Italy CNR IEHT Via Marini 6 I-16149 Genoa Italy

Space systems are subject to strict requirements in terms of relative position between two spacecraft and are controlled by actuators, which can perform limited output levels at low frequency. The aim of this work is the design of a sliding mode controller, which suitably combines simplex and super-twisting algorithms. This controller permits to reduce the number of thrusters required to control the spacecraft, the fuel consumption and the switching frequency at which the mono-directional actuators are turned on. The proposed control strategy can be easily converted in an on-board algorithm, with a minimum computational effort. Extensive simulations are carried out to validate the performance of the proposed sliding mode design. (C) 2017, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Satellite control applications Sliding mode control control algorithms Aerospace control Autonomous control

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