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Network Congestion control of Airport Surface Operations

JOURNAL OF GUIDANCE control AND DYNAMICS 2014年第3期37卷 933-940页

作者： Khadilkar, Harshad Balakrishnan, Hamsa MIT Dept Aeronaut & Astronaut Cambridge MA 02139 USA

This paper presents a novel approach to managing the aircraft taxi-out process at airports, by posing the problem in a network congestion control framework. A network model of the airport surface with stochastic link travel times is first developed. The model parameters for Boston Logan International Airport are estimated using empirical data from a surface surveillance system. Using the entry times of aircraft into the network as the control variables, a control algorithm tha aims to reduce taxi-out times is proposed. This algorithm regulates network congestion while limiting the adverse effect on throughput performance. Performance characteristics of the proposed control algorithm are derived using simplified theoretical analysis, and are shown to agree with simulations of traffic on a network model of Boston Logan International Airport.

关键词： Airport Surface Operations Boston Logan International Airport Airport Surface Detection Equipment, Model X control algorithm Taxiway Optimal control Transmission control Protocol Federal Aviation Administration Unscented Kalman Filter Communication Channels

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Experimental study on dynamics of rotatable bypass-valve in speed control pig in gas pipeline

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MEASUREMENT 2014年第1期47卷 686-692页

作者： Zhu, Xiaoxiao Zhang, Shimin Tan, Guibin Wang, Deguo Wang, Wenming China Univ Petr Coll Mech & Transportat Engn Beijing 102249 Peoples R China

Periodically pigging of oil and gas pipelines for dewatering, cleaning and inspecting becomes a standard industry procedure. Speed control unit is needed to control the speed of the pig and keep it work at a moderate constant speed, especially in the large diameter and high pressure gas pipelines. Rotatable bypass-valve is a necessary part in speed regulating unit, which is used to control the speed of pig by changing the amounts of the bypass flow across the pig body. However, the dynamics of the bypass-valve is complexity and indeterminacy during bypassing. As a result, in this paper, an experiment facility is set up to simulate the real working condition and get the dynamic characteristics of bypass-valve. The relationship among the torque, the opening of bypass-valve and the differential pressure over bypass-valve can be obtained in this experiment, which can provide the references to make control algorithm for speed control pig. (C) 2013 Elsevier Ltd. All rights reserved.

关键词： Gas pipeline Speed control pig Bypass-valve Torque characteristics control algorithm

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Generalizing Movements with Information-Theoretic Stochastic Optimal control

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JOURNAL OF AEROSPACE INFORMATION SYSTEMS 2014年第9期11卷 579-595页

作者： Lioutikov, Rudolf Paraschos, Alexandros Peters, Jan Neumann, Gerhard Tech Univ Darmstadt Intelligent Autonomous Syst Grp D-64283 Darmstadt Germany Max Planck Inst Intelligent Syst Dept Empir Inference D-72076 Tubingen Germany

Stochastic optimal control is typically used to plan a movement for a specific situation. Although most stochastic optimal control methods fail to generalize this movement plan to a new situation without replanning, a stochastic optimal control method is presented that allows reuse of the obtained policy in a new situation, as the policy is more robust to slight deviations from the initial movement plan. To improve the robustness of the policy, we employ information-theoretic policy updates that explicitly operate on trajectory distributions instead of single trajectories. To ensure a stable and smooth policy update, the "distance" is limited between the trajectory distributions of the old and the new control policies. The introduced bound offers a closed-form solution for the resulting policy and extends results from recent developments in stochastic optimal control. In contrast to many standard stochastic optimal control algorithms, the current approach can directly infer the system dynamics from data points, and hence can also be used for model-based reinforcement learning. This paper represents an extension of the paper by Lioutikov et al. ("Sample-Based Information-Theoretic Stochastic Optimal control," Proceedings of 2014 IEEE International Conference on Robotics and Automation (ICRA), IEEE, Piscataway, NJ, 2014, pp. 3896-3902). In addition to revisiting the content, an extensive theoretical comparison is presented of the approach with related work, additional aspects of the implementation are discussed, and further evaluations are introduced.

关键词： Theoretic Stochastic Optimal control Reinforcement Learning Robotics Linear Quadratic Gaussian Robots Markov Decision Process Kullback Leibler Divergence Search algorithm Optimization algorithm control algorithm

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Ultimate Boundedness Theorem for Model Reference Adaptive control Systems

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JOURNAL OF GUIDANCE control AND DYNAMICS 2014年第5期37卷 1595-1603页

作者： Hoecht, L. Bierling, T. Holzapfel, F. Tech Univ Munich Inst Flight Syst Dynam D-85748 Garching Germany

This paper presents a novel formulation of the Lyapunov-based ultimate boundedness theorem with explicit specification of transient and ultimate bounds, time to the ultimate bound, and the set of admissible initial conditions. The formulation is tailored to the structure of model reference adaptive control systems accounting for a partitioning of the state vector into a tracking error and a parameter estimation error. It allows for a computation of separate bounds for the single state vector partitions in favor of a single bound on the compound state, consisting of both partitions. This is of great practical importance because tracking error and parameter estimation error are of different magnitudes in general. Regarding model reference adaptive control systems, it is the state of the technology so far that the ultimate boundedness theorem is tailored to the structure of the considered system each time, again and again. It is hence manifest to formulate once a generic version of the theorem, tailored to model reference adaptive control systems, but not to reinvent the wheel for each case.

关键词： Model Reference Adaptive control Elevator Deflection Flight control System Adaptive control Systems Aviation Unmanned Aircraft System Second Order Differential Equations Attitude Stabilization Handling Qualities control algorithm

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A novel approach to control the properties of austenitic stainless steels in incremental forming

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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 2014年 604卷 23-26页

作者： Katajarinne, T. Louhenkilpi, S. Kivivuori, S. Aalto Univ TKK Sch Chem Technol Dept Mat Sci FI-00076 Espoo Finland

This rapid communication presents a novel approach for controlling the material property evolution for austenitic stainless steels during incremental sheet forming (ISF), offering a route to affect the strength and ductility of the parts produced. The method relies on the modelling and control of the formation of strain induced martensite. (c) 2014 Elsevier B.V. All rights reserved.

关键词： Incremental forming Strain induced martensite Strength Ductility control algorithm

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Dependence of the compensation error on the error of a sensor and corrector in an adaptive optics phase-conjugating system

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QUANTUM ELECTRONICS 2015年第8期45卷 736-742页

作者： Kiyko, V. V. Kislov, V. I. Ofitserov, E. N. Russian Acad Sci AM Prokhorov Gen Phys Inst Moscow 119991 Russia ITMO Univ St Petersburg 197101 Russia

In the framework of a statistical model of an adaptive optics system (AOS) of phase conjugation, three algorithms based on an integrated mathematical approach are considered, each of them intended for minimisation of one of the following characteristics: the sensor error (in the case of an ideal corrector), the corrector error (in the case of ideal measurements) and the compensation error (with regard to discreteness and measurement noises and to incompleteness of a system of response functions of the corrector actuators). Functional and statistical relationships between the algorithms are studied and a relation is derived to ensure calculation of the mean-square compensation error as a function of the errors of the sensor and corrector with an accuracy better than 10 %. Because in adjusting the AOS parameters, it is reasonable to proceed from the equality of the sensor and corrector errors, in the case the Hartmann sensor is used as a wavefront sensor, the required number of actuators in the absence of the noise component in the sensor error turns out 1.5 - 2.5 times less than the number of counts, and that difference grows with increasing measurement noise.

关键词： adaptive optics system phase conjugation deformable mirror control algorithm sensor error corrector error compensation error matching of the number of counts to the number of actuators

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control Concepts for Facilitating Motorway On-ramp Merging Using Intelligent Vehicles

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TRANSPORT REVIEWS 2014年第6期34卷 775-797页

作者： Scarinci, Riccardo Heydecker, Benjamin UCL Dept Civil Environm & Geomat Engn Ctr Transport Studies London WC1E 6BT England

Congestion at motorway junctions is a traffic phenomenon that degrades operation of infrastructure and can lead to breakdown of traffic flow and associated reduction in capacity. Advanced communication technologies open new possibilities to prevent or at least delay this phenomenon, and innovative active traffic management systems have been developed in the recent years for better control of motorway traffic. This paper presents a review of control strategies for facilitating motorway on-ramp merging using intelligent vehicles. First, the concepts of the control algorithms are reviewed chronologically divided into three types of intelligent vehicle: completely automated, equipped with cooperative adaptive cruise control and equipped with on-board display. Then, a common structure is identified, and the algorithms are presented based on their characteristics in order to identify similarities, dissimilarities, trends and possible future research directions. Finally, using a similar approach, a review of the methods used to evaluate these control strategies identifies important aspects that should be considered by further research on this topic.

关键词： active traffic management control algorithm on-board display motorway merging intelligent vehicle cooperative adaptive cruise control automated vehicle

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Test System Design of Lithium Battery Based on Fuzzy Self-tuning PID control 8

Test System Design of Lithium Battery Based on Fuzzy Self-tu...

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8th International Conference on Future Generation Communication and Networking FGCN

作者： Wang, Haiying Zhang, Fushuai Liu, Peng Li, Gechen Harbin Univ Sci & Technol Sch Automat Harbin Peoples R China

ISBN: (纸本)9781479977802

Aiming at the problem of control inflexible and the control algorithm cannot take into account the quick adjustment and accurate control of hardware closed-loop feedback, PID or fuzzy control algorithm in battery testing system;we put forward fuzzy self-tuning PID control algorithm to control charging voltage of lithium ion battery, solving the problem of nonlinear time-varying charging system semaphore cannot be quantified and evaluation cannot be determined, realizing flexible charging signal, precise control and quick adjustment of lithium ion battery testing system. Simulation results show that the control system has good dynamic response performance and stability that adding fuzzy self-tuning PID control.

关键词： control algorithm fuzzy self-tuning PID control algorithm simulation

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Dependable control Systems with Self-Recovery Constraint 3

Dependable Control Systems with Self-Recovery Constraint

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3rd International Conference on control, Automation and Information Sciences (ICCAIS)

作者： Tri Tran Ha, Q. P. Nanyang Technol Univ Cambridge Ctr Adv Res Energy Efficiency Singapore Yunnan Garden Campus Singapore Singapore Univ Technol Sydney Fac Elect Mech & Mechtron Syst Sydney NSW Australia

ISBN: (纸本)9781479972043

A novel constrained-state feedback control design method for duty-standby controllers of a dependable control system is presented in this paper. The dependable control system is a replacement for the classical reliable control system which has been developed for wired and analog systems. As an alternative to the control summation in reliable control systems, only one controller is active at any one time in a dependable control system. This will make it compatible with the duty-standby architecture of dependable computer systems that run the control algorithm. The automated managing of duty-standby controllers is challenging, especially in wireless sensor and actuator networks, owing to the scarcity of both information and processing resources. The solutions proposed in this paper are effective and feasible, as taking into account both state-and control-incremental constraints, and simply involving a static state-feedback strategy to minimize the computational demand in implementations. The state feedback gains are synthesized to fulfill the strict requirement on the two incremental constraints. As a result of that, the duty-standby controllers will be able to operate independently, while assuring the closed-loop system stability with a newly introduced self-recovery constraint. For a dependable control system, the employed self-recovery constraint is a quadratic constraint with respect to the control and state increments.

关键词： closed loop systems control system synthesis distributed control stability state feedback analog system closed-loop system stability constrained-state feedback control design control algorithm control-incremental constraint dependable control system duty-standby controller duty-standby controller management information resource processing resource quadratic constraint self-recovery constraint state feedback gain state-incremental constraint static state-feedback strategy wired system wireless sensor and actuator networks Computer architecture Computer network reliability control systems Program processors Reliability Vectors Wireless sensor networks

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Design, Implementation and control of a Small-scale UAV Quadrotor 11

Design, Implementation and Control of a Small-scale UAV Quad...

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11th World Congress on Intelligent control and Automation

作者： Tang, Yi-Rui Li, Yangmin Ma, Tienan Univ Macau Dept Electromech Engn Zhuhai Macao Peoples R China Tianjin Univ Technol Sch Mech Engn Tianjin 300191 Peoples R China

ISBN: (纸本)9781479958252

This paper presents a systematic approach to developing unmanned aerial vehicle (UAV) quadrotor systems. The system is built up based on a radio-controlled (R/C) quadrotor frame. With the careful selection of onboard hardware components, a physical avionics system is developed to interact with onboard sensors and actuators as well as perform data processing. To realize the control of the quadrotor, the values of control parameters need to be obtained in simulation prior to implementing physical hardware. Therefore, a nonlinear dynamic model is built for designing the controller in simulation. Finally, the developed control laws are performed and evaluated in both simulation and actual flight tests. The experimental results show that the designed quadrotor system exhibits a satisfactory performance and it is competent as an effective tool for conducting the further investigation of UAV research.

关键词： UAV quadrotor hardware components on-board avionics control algorithm

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