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2016年

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关键词： acm sigcomm aimd algorithm algorithms binomial binomial algorithm binomial algorithms congestion congestion control control control algorithms loss rate mit-lcs-tr-806 queue management rtt slow start sqrt tcp tcp aimd window window variation

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Noise suppression using local acceleration feedback control of an active absorber

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART I-JOURNAL OF SYSTEMS AND control ENGINEERING 2015年第6期229卷 495-505页

作者： Pelegrinis, Michail T. Pope, Simon A. Zazas, Ilias Daley, Stephen Univ Sheffield Dept Automat Control & Syst Engn Sheffield S1 3JD S Yorkshire England Univ Southampton Engn & Environm Southampton Hants England

A popular approach for active noise control problems has been the use of the adaptive filtered-X least mean square algorithm. A fundamental problem with feedforward design is that it requires both reference and error sensors. In order to reduce the size, cost and physical complexity of the control system, a feedback controller can be utilised. In contrast to filtered-X least mean square, a feedback controller utilises local acceleration measurements of a sound-absorbing surface instead of global pressure measurements. Most control problems, including active noise control, can be formulated in the general control configuration architecture. This type of architecture allows for the systematic representation of the process and simplifies the design of a vast number of controllers that include H and controllers. Such controllers are considered ideal candidates for active noise control problems as they can combine near-optimal performance with good robustness characteristics. This article investigates the problem of reflected noise suppression in acoustic ducts and the possibilities and trade-offs of applying H-2 control strategies. Hence, by controlling locally the reflecting boundary structure, a global cancellation of the undesired noise can be accomplished. In this article, the H-2 local feedback control strategy and performance are investigated using an experimental pulse tube. The H-2 design was chosen because it was able to provide consistently a stable response in contrast to the design.

关键词： Adaptive control systems control algorithms feedback feedforward control computer adaptive control computer control systems

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Exponential Stabilization of a Class of Monodimensional Distributed Parameter Systems by Boundary controller

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JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND control-TRANSACTIONS OF THE ASME 2016年第6期138卷 064501-064501页

作者： Ivanescu, Mircea Univ Craiova Dept Mechatron 13 Cuza St Craiova 200585 Romania

This paper treats the control problem of a class of monodimensional (1D) hyperbolic differential models with nonlinear components by using the boundary controller, the state measuring, and the control action on the boundary of the system. This controller is easy to implement from point of view of measuring techniques and actuation. The proposed algorithm provides the exponential convergence to the desired reference trajectory and rejects the effect of the nonlinear components by using the constraints in state space. A maximum principle of this class of system is inferred in order to evaluate the effect of boundary control. A constructive Lyapunov-based proof of convergence of the control algorithm is carried out. Numerical simulations of a technical model are presented.

关键词： control systems control equipment Robots Distributed parameter systems Trajectories (Physics) algorithms control algorithms Computer simulation Boundary-value problems

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Finite Time Response control of Affine Systems 16

Finite Time Response Control of Affine Systems

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16th International Carpathian control Conference (ICCC)

作者： Marin, Constantin Selisteanu, Dan Univ Craiova Dept Automat & Elect Craiova Romania

ISBN: (纸本)9781479973705

The paper presents an original method for Finite Time Response (FTR) control of the affine systems. The FTR property is specific to linear systems only, known in the literature as dead-beat algorithms. In this work, it is developed as a new procedure for the affine systems FTR synthesis, called the Equivalent Input Method (EIM). For this purpose it calculates an equivalent input which will determine, according to a quadratic criterion, the best approximation of the affine component. This way the system is approximated by an affine system with an input variable equal to the sum of the original input and the equivalent input, but having only a residual affine component. This residual affine component has a smaller norm than the initial affine component. Considering zero the residual affine component, a FTR linear system synthesis procedure is applied. In the real system, controlled by a FTR control law, the residual affine component creates at each step a disturbance that FTR algorithm seeks to cancel. This approach is justified by the fact that the disturbance residual affine component is much smaller in norm than the original affine component. Under certain circumstances, this residual affine component can be zero. The controllability and algorithm convergence is analyzed. The proposed EIM method can be applied also for nonlinear systems approximated by Piecewise Affine Subsystems (PWAS). An experimental platform has been designed in Matlab environment allowing implementation of various affine systems and their control algorithms. Simulation results are included to support the method presented in the paper.

关键词： finite time response variable structure systems control algorithms deadbeat algorithm

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22-2:Invited Paper: Adaptive Lighting for Energy-Efficient Comfort and Wellbeing

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SID Symposium Digest of Technical Papers 2017年第1期48卷

作者： Konstantinos Papamichael California Lighting Technology Center University of California Davis 633 Pena Drive Davis CA cltc.ucdavis.edu

Adaptive lighting refers to electric lighting sources that automatically adjust their output based on environmental changes, aiming at maximizing comfort, wellbeing and energy efficiency. This presentation provides an overview of the concept, focusing on adaptive lighting controls based on sensing occupancy and daylight. The overview reflects the adaptive lighting research, development and demonstration efforts of the California Lighting Technology Center. The adaptive lighting efforts were initiated in 2003 and continue today, having produced significant results and multiple commercial products. The goal of the efforts is to maximize electric lighting savings by automatically controlling electric lighting based on occupancy and daylight. The focus is on strategies and technologies to improve performance in terms of reliability and cost-effectiveness for wide-spread use in outdoor and indoor spaces of new and existing buildings.

关键词： Electric Lighting Daylighting Occupancy Sensor Motion Sensor Photo Sensor Demand Response control algorithms Adaptive Lighting Smart Lighting Smart Luminaires

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Derivative backoff: The other saturation problem for PID controllers

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JOURNAL OF PROCESS control 2015年 33卷 155-160页

作者： Theorin, Alfred Hagglund, Tore Lund Univ Dept Automat Control Lund Sweden

The PID controller is by far the most common controller, and to ensure good behavior under all circumstances, a PID implementation must consider many practical aspects such as integrator windup, derivative kick, and bumpless parameter and mode changes. In this paper, an entirely new issue for the derivative part is introduced and has been named derivative backoff. It occurs when the process value measurement saturates and is a general issue that affects all PID implementations. Derivative backoff is described in detail and it is shown that it can cause considerable, undesired, effects on industrially relevant processes even when they are controlled by well-tuned PID controllers. An antibackoff strategy for PID controllers with integral action is proposed and evaluated, and a simple patch for existing PID implementations is presented. Possible strategies for PID controllers without integral action are also discussed. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： Derivative backoff PID control PID controllers Derivative action control algorithms

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Study of Stability of Precise Tiled-grating Device

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STROJNISKI VESTNIK-JOURNAL OF MECHANICAL ENGINEERING 2015年第2期61卷 99-106页

作者： Liao Yunfei Zhou Yi Liu Youhai Zuo Dong Tan Bo Chongqing Univ Coll Mech Engn Chongqing 400044 Peoples R China

To satisfy the high-stability requirement of a tiled grating we have analyzed and optimized the stability of a newly designed precise tiled-grating device considering three aspects: structure design, transmission chain, and control algorithms. The main structure of the device is changed from a parallel-board structure to a new tetrahedral brace design, enhancing the overall vibration stability;during the analysis of the transmission chain, the adjustment accuracy and stability of the device were ensured by slowing the growth of the error transmission factor;and for the optimization analysis of the PID control algorithms, we adopted a latch compensation method to avoid the saturated loss and a four-point central difference method to avoid the disturbances, thus enhancing the stability control of the device. To test the stability of the device, an optical experiment with a reference spot was designed. The experimental results showed that over 380 s, the ambient excitation response was always within an acceptable range. The average deflections about the X axis and Y axis are 0.243 and 0.00146 mu rad, respectively, which satisfy the stability requirement.

关键词： tiled-grating compressor stability dynamic response tetrahedral transmission chain control algorithms

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Current controllers of Active Power Filter for Power Quality Improvement: A Technical Analysis

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AUTOMATIKA 2015年第1期56卷 42-54页

作者： Dey, Papan Mekhilef, Saad Univ Malaya Dept Elect Engn Power Elect & Renewable Energy Res Lab PEARL Kuala Lumpur 50603 Malaysia

Non-linear load deteriorates the quality of current waveforms at the point of common coupling of various consumers. Active power filter (APFs) is used to mitigate the most concern harmonic pollution in an electrical network. The controller part is the nucleus of an active power filter configuration. Active power filter performance is affected significantly by the selection of current control techniques. The active filter and its current control must have the capability to track sudden slope variations in the current reference to compensate the distorted current drawn by the voltage source inverter. Therefore, the choice and implementation of the current regulator is more important for the achievement of a satisfactory performance level. In this survey, technical reviews of various types of controllers covering a wide range have been presented. This work also reveals the advantages and disadvantages of the practiced control strategies. The effectiveness of the study will help the researchers to choose the proper control methods for various applications of active power filter.

关键词： Active power filters control algorithms Current controllers Comparison Harmonic currents Power quality Total harmonic distortion Root mean square (RMS) error

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MPPT Algorithm for PV Array Connected to a Hybrid Generation System 24

MPPT Algorithm for PV Array Connected to a Hybrid Generation...

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24th IEEE International Symposium on Industrial Electronics (ISIE)

作者： Rodriguez, Ernesto A. Freitas, Cleiton M. Bellar, Maria D. Monteiro, Luis F. C. Univ Estado Rio De Janeiro Campus F Negrao de Lima BR-20559900 Rio De Janeiro Brazil

ISBN: (纸本)9781467375542

In this paper, a modified algorithm based on the gradient descent method is proposed for determining, in real time, the maximum power provided by a PV Array connected to an Hybrid Generation System (HGS). In this system the PV array is connected to the dc-link of a back-to-back converter to drive a three-phase induction motor from a single-phase power grid. While the PV array operates at its maximum power, the remaining power is drawn or delivered to the power grid according to the load power demands. The proposed algorithm reduces the convergence time period and minimizes the residual error around the Maximum Power Point (MPP) value. The effectiveness of the proposed algorithm is analyzed through simulation results to evaluate its performance under transient and steady-state conditions. Furthermore, its dynamics is compared with the wellknown "Perturb and Observe" (P&O) MPPT algorithm.

关键词： Hybrid System MPPT control algorithms perturb and observe gradient descent active rectifier back to back converter photo-voltaic

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Operating Strategies for In-Plant Milk-Run Systems 15

Operating Strategies for In-Plant Milk-Run Systems

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15th IFAC Symposium on Information control Problems in Manufacturing

作者： Klenk, Eva Galka, Stefan Guenthner, Willibald A. Tech Univ Munich Inst Mat Handling Mat Flow Logist D-80290 Munich Germany

In-plant milk-run systems are transportation systems, where materials are delivered from a central storage area to several points of use on defined routes and in short intervals. Milk-run systems generally enable frequent deliveries in smaller lot sizes with short lead times and low inventory at the points of use. In real milk-run systems, the number of deliveries per interval varies due to, e.g., variations in the production program. To enable efficient and stable milk-run system operations, these systems therefore must be able to cope with peaks in the number of deliveries. We develop different strategies for handling these delivery peaks and evaluate them with respect to delivery: cost. lead time and service level using real material consumption data from two large companies from the automotive industry. (C) 2015, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Automobile industry control algorithms Lean manufacturing Logistics Milk-run systems Production systems Transportation control

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