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检索条件"主题词=Computer algorithms"

共 3274 条记录，以下是2561-2570 订阅

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A New Nonlinear Model Predictive Control Algorithm Using Differential Transformation with Application to Interplanetary Low-Thrust Trajectory Tracking

A New Nonlinear Model Predictive Control Algorithm Using Dif...

引用

2009 American Control Conference (ACC 2009)

作者： Rosemary Huang Inseok Hwang Martin Corless School of Aeronautics and Astronautics Purdue University West Lafayette Indiana 47907 Faculty of School of Aeronautics and Astronautics Purdue University West Lafayette Indiana 47907

ISBN: (纸本)9781424445233

A nonlinear model predictive control algorithm (NMPC) is proposed that incorporates a novel differential transformation (DT) based algorithm for the repeated computation of the open-loop optimal control problem. This DT method converts the two-point boundary value problem from the indirect optimization approach into a set of algebraic equations, which is a less computationally expensive way of solving the open-loop problem. The new NMPC algorithm is applied to an interplanetary low-thrust trajectory tracking problem.

关键词： two-point boundary value problem nonlinear model predictive control low thrust computer algorithms trajectory tracking Boundary value problems algorithms

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Synchronization in Coupled Fractional Order Chen-system and its Application in Secure Communication

Synchronization in Coupled Fractional Order Chen-system and ...

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2009国际通信电路与系统学术会议(ICCCAS 2009)(2009 International Conference on Communications，Circuits and Systems)

作者： Yan-Song Deng Kai-Yu Qin Shi-Quan Shao University of Electronic Science and Technology of China Chengdu Sichuan 610054 China and wit Institute of Astronautics and Aeronautics University of Electronic Science and Technology of China Institute of Electrical and Information Engineering Southwest University for Nationalities of China

ISBN: (纸本)9781424448876

A new projective synchronization in coupled fractional order chaotic Chen systems is studied. First, an approximation integer order system for the fractional order Chen system is constructed. Then, since the scaling factor of PS (projective synchronization) is predicted hardly, a control algorithm is thus proposed to improve on the projective synchronization in the new integer order systems. This control scheme can be used in some secure communication systems. Illustrations are also given to show the rightness of the theoretical analysis and the effectiveness of the method proposed.

关键词： Communication system security fractional order Instruction repertory Scale factor computer algorithms snow goose Theoretical analysis Integer

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Robust Control of Ship Fin Stabilizers Subject to Disturbances and Constraints

Robust Control of Ship Fin Stabilizers Subject to Disturbanc...

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2009 American Control Conference (ACC 2009)

作者： Reza Ghaemi Jing Sun Ilya V. Kolmanovsky Department of Electrical Engineering and Computer Science and the Department of Naval Architecture and Marine Engineering respectively at the University of Michigan Ann Arbor MI 48109 Ford Motor Company 2101 Village Road Dearborn MI 48124

ISBN: (纸本)9781424445233

This paper is concerned with constrained roll control of ship fin stabilizers operating in wave fields. Our approach is based on a robust control algorithm for linear discrete-time systems subject to bounded additive disturbances and a general class of input-state constraints. The proposed method is applied to control of fin stabilizers. Simulation results show that the proposed robust control method reduces the ship roll motion while satisfying the input and dynamic stall constraints. The proposed control algorithm does not involve on-line optimization, except for a linear program solved at initialization. On the theory side, we present a generalized form of our robust constrained control algorithm to the case of mixed state-input constraints.

关键词： computer algorithms Robust control Stabilizing agents Stabilizer Device Component Fins Constraint Ships wave fields linear programming initialization

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Development of Two-Degree-of-Freedom Control for Robot Manipulator with Biarticular Muscle Torque

Development of Two-Degree-of-Freedom Control for Robot Manip...

引用

2009 American Control Conference (ACC 2009)

作者： Sehoon Oh Yoichi Hori Department of Electrical Engineering School of Engineering University of Tokyo 4-6-1 Komaba Meguroku Tokyo

ISBN: (纸本)9781424445233

This paper suggests control algorithm for a robot manipulator which has biarticular muscle torque input in addition to the conventional two monoarticular muscle torques. Using a modified Jacobian matrix which is based on the absolute angle of two joints, we derive simple relationship between an endpoint force/position and three muscle torques. Based on this relationship a feedback controller is developed to design endpoint stiffness. The proposed control realizes the endpoint stiffness with arbitrary major axis, minor axis, and tilt angle with simple gain decision. As for the feedforward control, the dynamics of three muscles torque are derived and used as inverse dynamics in the control. It is found that with this biarticular muscle torque, the inertia matrix can be decoupled and has only diagonal elements. Simulation result shows the effectiveness of the proposed control.

关键词： Robot Manipulator Torque End Point muscles Jacobian matrix DYNAMICS CONTROL inverse kinematics feedback controller Standing Orders computer algorithms

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Control Algorithm for a SSSC

Control Algorithm for a SSSC

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International Conference-Workshop on Compatibility and Power Electronics (CPE)

作者： Pablo Fernandez Francisco D. Freijedo Jesus Doval-Gandoy Jano Malvar Electronics Technology Department University of Vigo

ISBN: (纸本)9781424428557

The power grid in most of the countries is aging and under increasing stress. The modern industrial infrastructure demands increasing amounts of affordable and reliable electricity. Solutions based on Flexible AC Transmission Systems (FACTS) can be used to control power flow on the grid. Shunt VARs compensators provide grid voltage support, while series VARs compensators are required to control active power flow. The Synchronous Static Series Compensator (SSSC) controls the active power flow by altering the impedance of the power lines or changing the angle of the voltage applied across the line. This paper presents a control algorithm for a SSSC which injects a voltage in series with the line in order to control the power flow. The amplitude and angle of the injected voltage is calculated as a function of the compensation rate and in order to control the DC bus voltage of the converter. A predictive synchronization algorithm is used to obtain the phase of the line current.

关键词： Static synchronous series compensator computer algorithms Power flow line current dc bus voltage Power grids Power cables VOLTAGE flexible AC transmission systems COMPENSATORS gate voltage active power

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IPMC Propelled Biomimetics Robotic Fish Energy Consumption Model Construction and Its application to Energy-saving Control

IPMC Propelled Biomimetics Robotic Fish Energy Consumption M...

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2009 IEEE International Conference on Robotics and Biomimetics(2009 IEEE 机器人与仿生技术国际会议 ROBIO 2009)

作者： Qingsong Hu Hua Zhou Engineering College Shanghai Ocean University201306China

ISBN: (纸本)9781424447749

Energy consumption efficiency is important in the design of the ionic polymer-metal composite (IPMC) propelled biomimetics robotic fish since it concerns about the cruising time in the water. IPMC energy consumption model is pretty critical to help improve it. Based on the physical properties of the IPMC material and the hydrodynamic reactive force theory, the energy consumption and accelerating velocity models are proposed. The model shows its precision by comparing with the experimental data. By embedding in the multi-objective compatible control algorithm, the model is applied to the energy-saving control of the IPMC propelled robotic .sh. The control result shows the validity of the model and control algorithm.

关键词： energy consumption IPMC Energy sources computer algorithms Standing Orders Biomimetics energy saving embedding

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Benchmark Tests of Active Disturbance Rejection Control on an Industrial Motion Control Platform

Benchmark Tests of Active Disturbance Rejection Control on a...

引用

2009 American Control Conference (ACC 2009)

作者： Gang Tian Zhiqiang Gao Center for Advanced Control Technologies Department of Electrical and Computer Engineering Cleveland State University Cleveland OH 44115 USA

ISBN: (纸本)9781424445233

The improvement of Active Disturbance Rejection Control over the existing industry controller is benchmarked with the state of the art industrial automation equipment, using the common PLC, drive, and the mechanical transmissions of belt, gear, and direct coupling. All together 168 tests are run at various line speeds, different levels of pulse-like torque disturbance, and with various viscous friction. The results are tabulated for comparison, in terms of integrated absolute error and maximum error observed, and the RMS and peak torque required from the drive motor. In the worst case scenarios, across all variations of mechanical configuration, we observe the performance improvement from just under 20percent to 290percent, with comparable control efforts. Together with simplicity in the control algorithm itself, the ease of tuning and operation, such improvement establishes ADRC as a viable replacement of the existing industry controller in manufacturing.

关键词： Robust control Benchmark testing state of the art disturbing torque Machine Configuration MECHANICAL TRANSMISSIONS computer algorithms performance boost Motor Control absolute error directly coupled DC motors maximum error peak torque BENCHMARKS

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A Framework to Approximate the Delay Distribution for IEEE 802.11 DCF Protocol

A Framework to Approximate the Delay Distribution for IEEE 8...

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IEEE Malaysia International Conference on Communications

作者： Yaw-Wen Kuo Wei-Fu Lu Tung-Lin Tsai Department of Electrical Engineering National Chi Nun University Graduate Institute of Communication Engineering National Chi Nun University

ISBN: (纸本)9781424455317;9781424455324

This paper presents a framework to approximate the distribution of the frame delay in the IEEE 802.11 WLAN. Two schemes are also provided to demonstrate the trade-off between complexity and accuracy. Based on the simulation results, scheme 1 can approximate the delay distribution well and scheme 2 is very fast. For the WLAN networks with delay QoS requirement, this paper provides an efficient method to develop admission control algorithm or tune system parameters.

关键词： IEEE 802.11 MAC QoS Delay distribution delay distribution Quality of service system parameter Approximate Frameworks computer algorithms

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A Tale of Three Actuators: How Mechanics, Business Models and Position Sensing Affect Different Mechatronic Servo Problems

A Tale of Three Actuators: How Mechanics, Business Models an...

引用

2009 American Control Conference (ACC 2009)

作者： Daniel Y. Abramovitch Nanotechnology Group at Agilent Laboratories 5301 Stevens Creek Blvd. M/S: 4U-SB Santa Clara CA 95051 USA

ISBN: (纸本)9781424445233

Students studying control problems often learn a lot of wondrous algorithms that impart near mythical properties to the systems that they are applied to. At least this is how it works in theory and simulation. In practice, however, a thorough understanding of the system, the use model, and the market is often far more important than the differences between any two optimization algorithms. Knowing when and where a particular algorithm is useful is typically at the heart of real control problems. This paper will focus on three servo systems with which the author has had considerable experience: hard disks, optical disks, and atomic force microscopes. By examining how the particulars of these three systems affect the use of control algorithms, the author will try to extract some general lessons.

关键词： Optimization algorithms Position Sense Atomic Force Microscopy Servo systems computer algorithms Microelectromechanical devices Servo actuators mechanic Mechanics Writers Compact disc Students

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Real-Time Fault Tolerant Control of a Reverse Osmosis Desalination Plant Based on a Hybrid System Approach

Real-Time Fault Tolerant Control of a Reverse Osmosis Desali...

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2009 American Control Conference (ACC 2009)

作者： Adrian Gambier Nikolaus Blumlein Essameddin Badreddin Automation Laboratory Institute of Computer Engineering Heidelberg University B6 26 68131 Mannheim Germany

ISBN: (纸本)9781424445233

Many applications of Reverse Osmosis desalination plants (RO plants) require a fault tolerant system, in particular when human life depends on the availability of the plant for producing fresh water. However, RO plants are little studied from the control engineering point of view: modeling, design of control algorithms and real-time experiments are scarcely reported in the literature. The present work is a study on a real RO plant in order to discover possible faults, to analyze potential methods for Fault-Tolerant Control (FTC) and the real-time experimentation. In order to implement model based control, the plant is identified in several operating points. Model Predictive Control (MPC) is used as control law and a hybrid supervisor is proposed to combine different methods, which perform better for different kind of faults. Satisfactory results are obtained for the real-time operation.

关键词： hybrid systems computer algorithms fault-tolerant control DESALINATION PLANTS Reverse osmosis plants REPORTABLE QUANTITIES REAL TIME OPERATION control law

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