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End-to-End Delay Analysis for Fixed Priority Scheduling in WirelessHART Networks

End-to-End Delay Analysis for Fixed Priority Scheduling in W...

引用

17th IEEE Real-Time and Embedded Technology and Applications symposium (RTAS)

作者： Saifullah, Abusayeed Xu, You Lu, Chenyang Chen, Yixin Washington Univ St Louis Dept Comp Sci & Engn St Louis MO 63130 USA

ISBN: (纸本)9780769543444

The WirelessHART standard has been specifically designed for real-time communication between sensor and actuator devices for industrial process monitoring and control. End-to-end communication delay analysis for WirelessHART networks is required for acceptance test of real-time data flows from sensors to actuators and for workload adjustment in response to network dynamics. In this paper, we map the scheduling of real-time periodic data flows in a WirelessHART network to real-time multiprocessor scheduling. We, then, exploit the response time analysis for multiprocessor scheduling and propose a novel method for the end-to-end delay analysis of the real-time flows that are scheduled using a fixed priority scheduling policy in a WirelessHART network. Simulations based on both random topologies and real network topologies of a physical testbed demonstrate the efficacy of our end-to-end delay analysis in terms of acceptance ratio under various fixed priority scheduling policies.

关键词： Delay Job shop scheduling Logic gates processor scheduling Real time systems Upper bound WirelessHART network delays end to end delay analysis fixed priority scheduling industrial process monitoring multiprocessor scheduling network dynamic network topology scheduling sensor telecommunication network topology wireless sensor networks

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A Novel Magnetic-Levitation System: Design, Implementation, and Nonlinear control

A Novel Magnetic-Levitation System: Design, Implementation, ...

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15th International symposium on Electromagnetic Launch (EML) Technology

作者： Hasirci, Ugur Balikci, Abdulkadir Zabar, Zivan Birenbaum, Leo Gebze Inst Technol Dept Elect Engn TR-41400 Kocaeli Turkey NYU Polytech Inst Dept Elect & Comp Engn New York NY 10004 USA

This paper concerns the design, implementation, and nonlinear velocity-tracking control of a novel magnetic-levitation (maglev) system for magnetically levitated trains. The proposed system uses only one tubular linear induction motor to produce three forces required in a maglev system: propulsion, levitation, and guidance. Classical maglev systems, on the other hand, contain a separate force-generating system to build each of these three forces. Another benefit that the proposed system offers is that there is no need to control the guidance, and particularly, the levitation forces, one of the most challenging tasks in maglev systems. The system always centers the moving part during operation and eliminates the necessity for control of the levitation and guidance forces. However, the propulsion force strongly requires some control efforts because a linear induction motor has nonlinear system dynamics. This paper gives a condensed design guideline based on the mature theory of electromagnetic launchers, particularly the linear induction launcher type. It explains the implementation process, shows experimental test results, and finally, presents a nonlinear partial state-feedback controller for the proposed system.

关键词： Electromagnetic launchers (EMLs) linear induction launchers (LILs) magnetic-levitation (maglev) trains nonlinear control

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Fast Estimation and L₁ Adaptive control for Bottomhole pressure in Managed Pressure Drilling

Fast Estimation and <i>L</i><sub>1</sub> Adaptive Control fo...

引用

IEEE International symposium on Intelligent control (ISIC)/IEEE Multi-Conference on systems and control (MSC)

作者： Li, Zhiyuan Hovakimyan, Naira Kaasa, Glenn-Ole UIUC Dept Mech Sci & Engn Urbana IL 61801 USA Statoil Res Ctr Porsgrunn Norway

ISBN: (纸本)9781457711039

In managed pressure drilling, there are two main challenges involved. First, the bottomhole pressure and flow rate to be controlled is updated at a low rate, which can be viewed as unmeasured. Second, the drilling process is subject to unknown parameters (e. g., frictions, densities), unmodeled dynamics and noise. To deal with these issues, this paper presents an integrated fast estimation and L-1 adaptive control scheme. The estimator provides fast estimation of the bottomhole pressure based on the available measurements. The L-1 adaptive controller drives the pressure to the desired value following a reference model. The design is based on a recently developed nonlinear drilling model. The results demonstrate that the L-1 adaptive controller has guaranteed performance bounds for both the input and the output signals of the system while using the estimation of the regulated outputs. Simulations that include different operational conditions verify the theoretical findings.

关键词： controllers

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Model predictive control performance assessment using a prediction error benchmark

Model predictive control performance assessment using a pred...

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作者： Zhang, Rongjin Zhang, Quanling Institute of Cyber-Systems and Control State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou China

Model predictive control technology can now be found widely in a variety of applications including petroleum, chemical and papermaking industries. An approach is proposed to decide a benchmark and monitor model predictive control performance on-line. A performance measure based on multi-step prediction error benchmark is shown to be more realistic without the requirement of process models or interactor matrix. A practical on-line monitoring strategy is presented which emphasizes the use of routine operating data plus the order of the interactor matrix to determine when it becomes worthwhile to re-identify the plant dynamics and re-install the model predictive control application. © 2011 Zhejiang University.

关键词： Model predictive control

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Structure restricted (PID) controller performance assessment for multi-stage batch processes with tracking and regulatory requirements

Structure restricted (PID) controller performance assessment...

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作者： Fu, Ruowei Xie, Lei Song, Zhihuan Institute of Industrial Process Control Department of Control Science and Technology Zhejiang University Hangzhou 310027 China State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou 310027 China

A new control performance assessment method based on a structured residual for multi-stage batch processes is presented. After separating the process into different stages according to reference signal dynamics, based on specific tracking and regulatory requirements of different stage, a structured residual focusing on deterministic part of output error with different weights on each stage is minimized to form the performance benchmark. In this way, it explores the equilibrium control effect in tracking and regulatory stages of batch processes in the whole batch sense. The best control performance with respect to stage balance and the overall optimal controller settings are searched using Newton's method. The application to an exothermic chemical batch reactor shows its effectiveness and feasibility. © 2011 Zhejiang University.

关键词： Batch reactors

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A robust and optimal LQR controller design for Electric Power Steering system

A robust and optimal LQR controller design for Electric Powe...

引用

Joint 3rd International Workshop on Nonlinear dynamics and Synchronization, INDS'11 and 16th International symposium on Theoretical Electrical Engineering, ISTET'11

作者： Chitu, Cristian Lackner, Jochen Horn, Martin Waser, Helmut Kohlböck, Markus Institute of Smart System-Technologies Control and Measurement Systems Group University of Klagenfurt A-9020 Klagenfurt Austria Project House - Functional Area Steering MAGNA Powertrain AG and Co. KG A-8502 Lannach Austria

ISBN: (纸本)9781457707599

This paper presents a Linear Quadratic Regulator (LQR) employed to improve performance of an Electric Power Steering (EPS) system. Generally, EPS is a full electric system having an electric motor which provides the assist torque on the steering mechanism in order to reduce the workload and to enhance the steering feel of the driver during steering process. Three main technical areas are described in this paper. First, the principle and structure of EPS are presented including the dynamic model. Second, LQR technique is employed to derive an optimal controller for the EPS system. Finally, the combined tools of Matlab/Simulink and dSPACE provide the environment for modeling the controller in software and applying it to the actual hardware via a digital signal processing board based on the DS1401 MicroAutoBox. Comparison and analysis between the simulation results and dSPACE hardware results are discussed. © 2011 IEEE.

关键词： Digital signal processing

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Modeling and control system design of an MCFC system

Modeling and control system design of an MCFC system

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作者： Im, Huiyong K. Cho, June Ho Lee, Kwang Soon Simkyun Yook Wonhee Jung Faculty of Chemical and Biomolecular Engineering Department of Chemical and Biomolecular Engineering Sogang University Seoul Korea Republic of Doosan Heavy Industries and Construction Co.Ltd. Plant Control Systems Development Team Korea Republic of

A molten carbonate fuel cell (MCFC) system is modeled and a control strategy is proposed. A spatially distributed two-dimensional dynamic model of single cell direct internal reforming MCFC was developed as a numerical process by reducing the PDE model to a set of ODE's using the cubic spline collocation method and the finite difference method. Mean cell temperature, Ts;m, maximum temperature difference over a cell, ΔTs;max, oxygen conversion, XO2, and hydrogen mole fraction at the anode outlet, χH2;o, were considered as controlled variables (CV's) under the assumption that their target values are determined by an optimizer in the upper level. Among the CV's, Ts;m and ΔTs;max have much slower dynamics than the other two and keeping ΔTs;max below a certain safety limit is critical. Hence Ts;m and ΔT s;max were designed to be separately controlled under model predictive controller (MPC). On the other hand, XO2 and χH 2;o have fast dynamics and were designed to be regulated by single loop PID controllers with feedforward compensation. The manipulated variables (MV's) for each CV group were determined through a system analysis using the singular value decomposition and relative gain array. The performance of the control scheme was evaluated against load (power demand) changes. © 2011 Zhejiang University.

关键词： Finite difference method

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NN/RISE-based asymptotic tracking control of uncertain nonlinear systems

NN/RISE-based asymptotic tracking control of uncertain nonli...

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IEEE International symposium on Intelligent control (ISIC)

作者： Qinmin Yang S. Jagannathan Youxian Sun State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control Zhejiang University Hangzhou Zhejiang China Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO USA

This paper presents a novel control methodology for the tracking control of a high-order continuous time nonlinear systems with unknown dynamics and external disturbance. The control signal consists of the robust integral of the sign of the error (RISE) feedback signal multiplied with an adaptive gain plus neural network (NN) output. The two-layer NN learns the system dynamics in an online manner while residual reconstruction errors and the external bounded system disturbances are overcome by the RISE signal. Semi-global asymptotic tracking performance is theoretically guaranteed by using the Lyapunov standard method, while the NN weights and all other signals are shown to be bounded. Further, simulations results are present to illustrate the control performance.

关键词： Artificial neural networks Approximation methods Asymptotic stability Nonlinear systems Trajectory Stability analysis Robustness

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Problems associated with the simultaneous design of a spray drying tower

Problems associated with the simultaneous design of a spray ...

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IEEE Latin American Robotics symposium, LARS

作者： C Cardona M Medina M Vera Dynamics Process Research Group KALMAN Universidad Nacional de Colombia-Facultad de Minas Medellín Colombia Dynamics Process Research Group KALMAN Universidad Nacional de Colombia - Facultad de Minas Medellín Colombia

This paper mentions the integrated design strategy and process control system, describing the problems in each stage associated with this design strategy, when applied to a spray drying tower for natural dyes. Initially, part of a phenomenological based semiphysical model of concentrated parameters, which describes the main dynamic process and has been validated in another work. Then, the control pairing is established to proceed with controllability analysis using Lie Algebra's. Once, the regions of controllability of the process are established, a PID controller is tuned. Finally the model is simulated in an open loop and a closed loop to show the advantages of simultaneous design approach.

关键词： Decision support systems

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Structure restricted (PID) controller performance assessment for multi-stage batch processes with tracking and regulatory requirements

Structure restricted (PID) controller performance assessment...

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International symposium on Advanced control of Industrial processes (ADCONIP)

作者： Ruowei Fu Lei Xie Zhihuan Song State Key Laboratory of Industrial Control Technology Institute of Industrial Process Control Department of Control Science and Technology University of Zhejiang Hangzhou Zhejiang China State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control University of Zhejiang Hangzhou China

关键词： Benchmark testing Batch production systems process control Stochastic processes Optimization Equations Inductors

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