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3rd International Conference on Mechanical, Electronic and Information Technology engineering, ICMITE 2017

作者： Yang, Feng Lv, Ye Li, Wenting Department of Aeronautics and Astronautics Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China Institute of Manned Space System Engineering China Academy of Space Technology Beijing100094 China School of information system and management National University of Defense Technology Changsha410073 China Beijing Aerospace Automatic Control Institute Beijing100039 China

The paper introduces the modeling method and modeling tool for the fault diagnosis of manned spacecraft, the multi-signal flow graph model of a manned space equipment was established using this method;the framework of the fault detection and diagnosis system of manned spacecraft is proposed, the function of ground system and function of the spacecraft are clearly defined. The structure of the functional module is given separately;finally, the tool builds the fault detection and diagnosis system, the application of fault diagnosis method for manned spacecraft is used for reference. © The Authors, published by EDP Sciences, 2017.

关键词： Fault detection

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Development of Constrained Predictive Functional control using Laguerre Function Based Prediction

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IFAC-PapersOnLine 2017年第1期50卷 10705-10710页

作者： Abdullah M. Rossiter J.A. Haber R. Department of Automatic Control and System Engineering University of Sheffield Mappin StreetS1 3JD United Kingdom Dept. of Mech. Engin. International Islamic University Malaysia Institute of Process Engineering and Plant Design Cologne University of Applied Sciences Köln D-50679 Germany

This work presents a novel constraint handling strategy for Predictive Functional control (PFC). First, to improve prediction consistency, the constant input assumption of nominal PFC approaches is replaced with Laguerre based prediction. This substitution improves the effectiveness of using a constrained solution to prevent long-term constraint violations. Secondly, for state constraints, a simpler single regulator approach is proposed instead of switching between regulators, an approach common in the PFC literature. Simulation results verify that the proposed method manages the constraints better than the traditional approach. Moreover, despite all the modifications, the controller formulation and framework remain simple and straightforward which thus are in line with the key ethos of PFC. © 2017

关键词： Constrained PFC Effective Constraint Technique Predictive control

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Enhanced GMM-based Filtering with Measurement Update Ordering and Innovation-based Pruning

Enhanced GMM-based Filtering with Measurement Update Orderin...

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International Conference on Information Fusion

作者： Xi Li Le Yang Lyudmila Mihaylova Fucheng Guo Min Zhang School of Electronic Science National University of Defense Technology Changsha China Department of ECE University of Canterbury Christchurch New Zealand Department of Automatic Control & System Engineering University of Sheffield Sheffield UK

The Gaussian mixture model (GMM) has been extensively investigated in nonlinear/non-Gaussian filtering problems. This paper presents two enhancements for GMM-based nonlinear filtering techniques, namely, the adaptive ordering of the measurement update and normalized innovation square (NlS)-based mixture component management The first technique selects the order of measurement update by maximizing the marginal measurement likelihood to improve performance. The second approach takes the filtering history of a mixture component into account and prunes those components with NIS larger than a threshold to eliminate their impact on the filtering posterior. The advantage of the proposed enhancements is illustrated via simulations that consider source tracking using the time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements received at two unmanned aerial vehicles (UAVs). A GMM-cubature quadrature Kalman filter (CQKF) is implemented and its performances with different measurement update and mixture component management strategies are compared. The superior performance obtained via the use of the two proposed techniques is demonstrated.

关键词： Time measurement Covariance matrices Noise measurement Frequency measurement Weight measurement Merging Kalman filters

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A Review of Industrial Heat Exchange Optimization

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IOP Conference Series: Earth and Environmental Science 2018年第4期108卷

作者： Junjie Yao Department of Automatic Control System Engineering University of Sheffield Sheffield. S1 4DH U.K.

Heat exchanger is an energy exchange equipment, it transfers the heat from a working medium to another working medium, which has been wildly used in petrochemical industry, HVAC refrigeration, aerospace and so many other fields. The optimal design and efficient operation of the heat exchanger and heat transfer network are of great significance to the process industry to realize energy conservation, production cost reduction and energy consumption reduction. In this paper, the optimization of heat exchanger, optimal algorithm and heat exchanger optimization with different objective functions are discussed. Then, optimization of the heat exchanger and the heat exchanger network considering different conditions are compared and analysed. Finally, all the problems discussed are summarized and foresights are proposed.

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Numerical Evaluation of a Robust Self-Triggered MPC Algorithm

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IFAC-PapersOnLine 2016年第22期49卷 151-156页

作者： Brunner, Florian D. Heemels, W.P.M.H. Allgöwer, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart70569 Germany Control System Technology Group Department of Mechanical Engineering Eindhoven University of Technology Netherlands

We present numerical examples demonstrating the efficacy of a recently proposed self-triggered model predictive control scheme for disturbed linear discrete-time systems with hard constraints on the input and state. In order to reduce the amount of communication between the controller and the actuator, the control input is not re-computed at each point in time but only at certain sampling instances. These instances are determined in a self-triggered fashion in the sense that at every sampling instant the next sampling instant is computed as a function of the current system state. A compact set in the state space, whose size is a design parameter in the control scheme, is stabilized. © 2016

关键词： Discrete time control systems Digital control systems Model predictive control Predictive control systems Robustness (control systems) control inputs control schemes Design parameters Hard constraints Linear discrete time systems Predictive control Sampling instants Self triggered controls

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Methodological basis for constructing a method for compressing of transformants bit representation, based on non-equilibrium positional encoding

Methodological basis for constructing a method for compressi...

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International Conference on Advanced Information and Communication Technologies (AICT)

作者： V. V. Barannik Yu. N Ryabukha V. V. Tverdokhleb D. V. Barannik Department of combat use automatic control system Kharkiv University of Air Force named I. Kozhedub Kharkiv Ukraine Department of information and network engineering Kharkiv National University of Radio Electronics Kharkiv Ukraine

ISBN: (纸本)9781538606384

For more effective use of the bandwidth of the infocommunication network channels, compression methods are used, which make it possible to present information in a compact form. This is most relevant in the face of a constant increase in the volume of transmitted video data sensitive to transmission delays. However, in addition to reducing the intensity of the transmitted video, it is also necessary to provide a given error level to ensure the quality of the received data on the receiver side.

关键词： Encoding

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Non-parametric modeling of double-link flexible robot manipulator based on NNARX model structure 19th

Non-parametric modeling of double-link flexible robot manipu...

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19th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2016

作者： Jamali, Annisa Mat Darus, Intan Zaurah Abdulhussain, Ali Tokhi, M.O. Automation and Control Laboratory Faculty of Mechanical Engineering Universiti Teknologi Malaysia SkudaiJohor81300 Malaysia Department of Automatic Control and System Engineering University of Sheffield United Kingdom

ISBN: (纸本)9789813149120

The double-link flexible robot manipulator (DLFR) is a highly non-linear system. The development of existing linear models involves a lot of assumptions and approximations in order to reduce the complex calculation. Due to that, this paper presents a non-linear Auto Regressive model with eXogenous inputs (NARX) for DLFR and neural network is used to predict the non-linear segment. Thus, NNARX structure is used to develop four separate model of double link flexible manipulator from torque input to hub angle and from torque input to end point accelerations of each link. The performance of NNARX models are validated via One Step Ahead, Mean Squared Error and correlation tests. © 2016, World Scientific Publishing Co. Pte Ltd. All rights reserved.

关键词： Flexible manipulators

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Evaluation of the cost of using power plant reject heat in low-temperature district heating and cooling networks

Evaluation of the cost of using power plant reject heat in l...

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2016 World Congress on Sustainable Technologies, WCST 2016

作者： Santos, Antonio Colmenar Diez, David Borge Asensio, Enrique Rosales Sánchez, Patricia Sánchez Department of Electric Electronic and Control Engineering UNED Madrid28040 Spain Department of Electric System and Automatic Engineering Universidad de León León Spain

ISBN: (纸本)9781908320704

The purpose of this paper is to assess the economic impact following as a result of the conversion of conventional stations to cogeneration plants connected to a system for distributing heat and refrigeration. The analysis will be carried out through a financial evaluation in order to assess yearly variations of the whole scheme expenditure. In particular, yearly capital and operating costs of supplying cold and heat to urban areas that represent weather conditions in northern, central, and southern Europe were studied. In the base case scenario, today conditions are represented;they will be compared with alternative scenarios in which existing conventional thermal power stations will be converted into cogeneration plants. This research work contributes to the pool of existing knowledge by giving a (so far not addressed) weather centered system perspective. From the conducted evaluation, it was found that, in the case of deciding to convert the studied conventional thermal plants into cogeneration plants, investing in the necessary infrastructure associated means that yearly expenses for the power plants located in Oldenburg-Wilhelmshaven, Bristol, and Cartagena would decrease by 215, 89, and 192 million euros respectively, making this technology a highly attractive option from economic, energetic, and environmental perspectives. © 2016 Infonomics Society.

关键词： Cogeneration plants

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Cogeneration and district heating networks: Measures to remove institutional and financial barriers that restrict their joint use in the EU-28

Cogeneration and district heating networks: Measures to remo...

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2016 World Congress on Sustainable Technologies, WCST 2016

ISBN: (纸本)9781908320704

The aim of this research is to identify actions that dissipate the institutional and financial barriers that are faced by those energy projects which comprise the joint use of district heating networks and cogeneration in the EU-28. From this evaluation, institutional and financial barriers were identified, which included: distinctive competence, fuel price volatility, and much of the current regulatory framework. In order to achieve an effective removal of these barriers, and apart from generic and common actions to all the schemes, such as creating anchor loads, adopting an active marketing strategy by the local authorities, or the proposition of updating some communitarian directives on energy issues;it is also necessary to adopt those actions that respond to the casuistry of each Member State. Such actions will ultimately represent the most effective way to get a generalised implementation of energy projects that include a joint use of district heating networks and cogeneration. © 2016 Infonomics Society.

关键词： District heating

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Tracking human upper-limb movements with sliding mode control type-II fuzzy logic

Tracking human upper-limb movements with sliding mode contro...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Siti Khadijah Ali Ahmad Riyad Firdaus M. O. Tokhi Ghasaq Al-Rezage Department of Automatic Control and System Engineering University of Sheffield

A knowledge of human upper-limb structure and its mechanical functions are important for developing an exoskeleton. The Sliding Mode control with Fuzzy Type-II is proposed to control the movements of the human extremity joints. The Lagrange method is used to model the dynamics system of human upper-limb. The findings demonstrate the effectiveness of the proposed controller in tracking the desired motion and it is also able to eliminate the chattering problem as well as deal with uncertainties.

关键词： Mathematical model Exoskeletons Trajectory Sliding mode control Fuzzy logic Time factors

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