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Selection of Decentralised Schemes and Parametrisation of the Decentralised Degenerate Compensators

IFAC-PapersOnLine 2016年第9期49卷 74-79页

作者： Karcanias, N. Meintanis, I. Leventides, J. Systems and Control Research Centre School of Mathematics Computer Science and Engineering City University London Northampton Square LondonEC1V 0HB United Kingdom University of Athens Department of Economics Section of Mathematics and Informatics Pezmazoglou 8 Athens Greece

The design of decentralised control schemes has two major aspects. The selection of the decentralised structure and then the design of the decentralised controller that has a given structure and addresses certain design requirements. This paper deals with the parametrisation and selection of the decentralized structure such that problems such as the decentralised pole assignment may have solutions. We use the approach of global linearisation for the asymptotic linearisation of the pole assignment map around a degenerate compensator. Thus, we examine in depth the case of degenerate compensators and investigate the conditions under which certain degenerate structures exist. This leads to a parametrisation of decentralised structures based on the structural properties of the system. © 2015

关键词： Decentralized control Algebra control theory Multivariable systems Poles Algebraic method Decentralised control Geometric method Linear multivariable systems Output feedback controls Pole assignment

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Zero Assignment Problem in RLC Networks

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IFAC-PapersOnLine 2016年第9期49卷 92-98页

作者： Leventides, John Livada, Maria Karcanias, Nicos University of Athens Department of Economics Section of Mathematics and Informatics Pezmazoglou 8 Athens Greece City University London Systems and Control Research Centre School of Mathematics Computer Science & Engineering Northampton Square LondonEC1V 0HB United Kingdom

The paper deals with the problem of zero assignment in RLC networks by selection of appropriate values for the non- dynamical elements, the resistors. For a certain family of network redesign problems by the additive perturbations may be described as diagonal perturbations and such modifications are considered here. This problem belongs to the family of DAP problems (Determinantal Assignment Problem) and has common features with the pole assignment problem by decentralized output feedback and the zero assignment problem via structured additive perturbations. We demonstrate that the sufficient condition for generic zero assignment by selecting the resistors holds true. This condition is related to the rank of the differential of the related map and holds true generically when the degrees of freedom of the matrix of resistors exceeds the number of frequencies to be assigned (n > p + q). Using this result, we show through a generic example that the sufficient condition for the general zero assignment problems in RLC networks is satisfied and thus, zero assignment can be achieved via resistor determination. © 2015

关键词： Resonant circuits Algebra Circuit theory Combinatorial optimization Degrees of freedom (mechanics) Resistors System theory Algebraic geometry Assignment problems Common features Diagonal perturbation Output feedback Pole assignment problem Show through Zero assignment

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Ductal carcinoma in situ detection in breast thermography by extreme learning machine and combination of statistical measure and fractal dimension

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Journal of Ambient Intelligence and Humanized Computing 2017年 1-11页

作者： Wang, Shui-Hua Muhammad, Khan Phillips, Preetha Dong, Zhengchao Zhang, Yu-Dong Jiangsu Key Laboratory of Advanced Manufacturing Technology HuaiyinJiangsu223003 China School of Computer Science and Technology Henan Polytechnic University JiaozuoHenan454000 China Ministry of Education Key Laboratory of Measurement and Control of Complex Systems of Engineering Southeast University Nanjing China College of Software Convergence Sejong University Seoul Korea Republic of Department of Informatics University of Leicester LeicesterLE1 7RH United Kingdom West Virginia School of Osteopathic Medicine 400 N Lee St LewisburgWV24901 United States Translational Imaging Division and MRI Unit Columbia University and New York State Psychiatric Institute New YorkNY10032 United States

Ductal carcinoma in situ (DCIS) is a severe breast disease. It generates little symptom and may be neglected in prodromal stage. In this study, we developed a novel DCIS detection method based on breast thermography, which can provide earlier alert than other exams. We created a 40 breast-thermogram dataset. We used six statistical measures, and we used fractal dimension to describe the texture measure. The extreme learning machine was used as the classifier. Our developed system yielded a sensitivity of 93.0 ± 2.6%, a specificity of 92.5 ± 2.6%, and an accuracy of 92.8 ± 1.8%. The extreme learning machine was better than support vector machine, artificial neural network, decision tree, and weighted k-nearest neighbors. Besides, our developed system was superior to six state-of-the-art approaches. © 2017 Springer-Verlag GmbH Germany, part of Springer Nature

关键词： Fractal dimension

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Current control of PMSM based on maximum torque control reference frame

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AIP Conference Proceedings 2017年第1期1865卷

作者： Takumi Ohnuma 1Department of Electronic Control System Engineering National Institute of Technology Numazu College 3600 Ooka Numazu-city Shizuoka Japan

This study presents a new method of current controls of PMSMs (Permanent Magnet Synchronous Motors) based on a maximum torque control reference frame, which is suitable for high-performance controls of the PMSMs. As the issues of environment and energy increase seriously, PMSMs, one of the AC motors, are becoming popular because of their high-efficiency and high-torque density in various applications, such as electric vehicles, trains, industrial machines, and home appliances. To use the PMSMs efficiently, a proper current control of the PMSMs is necessary. In general, a rotational coordinate system synchronizing with the rotor is used for the current control of PMSMs. In the rotating reference frame, the current control is easier because the currents on the rotating reference frame can be expressed as a direct current in the controller. On the other hand, the torque characteristics of PMSMs are non-linear and complex; the PMSMs are efficient and high-density though. Therefore, a complicated control system is required to involve the relation between the torque and the current, even though the rotating reference frame is adopted. The maximum torque control reference frame provides a simpler way to control efficiently the currents taking the torque characteristics of the PMSMs into consideration.

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Researches on Tie Rod Ends Lubricated by Grease with TiO2 and ZrO2 Nanoparticles

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Journal of Physics: Conference Series 2018年第1期1033卷

作者： Marek Wozniak Krzysztof Siczek Przemysław Kubiak Piotr Jozwiak Krystian Siczek Lodz University of Technology / Department of Vehicles and Fundamentals of Machine Design Stefanowskiego Str. 1/15 90-924 Lodz Poland Lodz University of Technology / Faculty of Electrical Electronic Computer and Control Engineering Stefanowskiego Str. 18/22 90-924 Lodz Poland

The nanoparticles of some materials can be used successfully to improve tribological properties through decreasing both wear and friction borne out of contact between the contact surfaces of elements in different devices, particularly vehicles. Nanoparticles of TiO2 and ZrO2 were chosen as additives to the lithium grease lubricating the contact surfaces in tie rod ends. The object of study was the steel ball – the component of the tie rod end – mating with the polymer insert and lubricated with the pure lithium grease or containing the addition of pure TiO2, pure ZrO2 nanoparticles, with a 1%wt. Studies on friction were carried out using the tester allowing cyclical rotational motion and different loading of contact. Wear was investigated by driving a car, whose tie rod ends were analysed, on a fixed 'eight'-shape track and with a fixed velocity pattern. The aim of the study was to obtain the values and waveforms of friction moment and wear versus cycles, loading and composition of lubricating grease. The waveforms of friction coefficient were obtained using the FEM model of the analysed contact zone. Based on the obtained waveforms, recommendations for the composition of additives for lithium grease were made.

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Bat algorithm and neural network for monthly streamflow prediction

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AIP Conference Proceedings 2018年第1期2030卷

作者： Nuratiah Zaini M. A. Malek Marina Yusoff Siti Fatimah Che Osmi Nurul Hani Mardi Shuhairy Norhisham 1Department of Civil Engineering Universiti Tenaga Nasional 43000 Kajang Selangor Malaysia 2Institute of Sustainable Energy Universiti Tenaga Nasional 43000 Kajang Selangor Malaysia 3Institute for Infrastructure Engineering and Sustainable Management Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia 4Faculty of Computer and Mathematical Sciences Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia

Streamflow prediction has a significance influence on improving water supply management and flood prevention. The applications of artificial intelligence (AI) have been proved to have better performance as compared to conventional statistical method in streamflow prediction. Therefore, this study proposed on the development of streamflow prediction model AI techniques namely Bat algorithm (BA) and backpropagation neural network (BPNN). BA is an optimization technique, which is to optimize BPNN in deciding optimum parameters and then improve the prediction accuracy. The study area chosen is Kuantan river and Kenau river, located in Kuantan, Malaysia. Two prediction models are proposed in this study which are BPNN and hybrid Bat-BPNN. Monthly historical rainfall data, antecedent river flow data and meteorology parameters data for two different rivers were used as the input to the proposed models. The performance of the proposed prediction models for Kuantan river and Kenau river are then being compared and evaluated in term of RMSE and R2. It is found that hybrid model, Bat-BPNN yields lower RMSE and provides higher R2 as compared to BPNN model at both Kuantan river and Kenau river. Therefore, it can be concluded that, proposed hybrid model yields better performances as compared to BPNN model for monthly streamflow prediction.

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Set-up of active magnetic bearings for control of flexible shaft

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AIP Conference Proceedings 2018年第1期2029卷

作者： Adam Piłat Bartosz Sikora Jan Klocek Jan Cieślik 1AGH University of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Mickiewicza 30 30-059 Krakow Poland 2Optister Jalowcowa 50 31-329 Krakow Poland 3AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Manufacturing Systems Mickiewicza 30 30-059 Krakow Poland

This paper presents the new laboratory test rig of the vertical axis flexible shaft supported by two active magnetic bearings. Behind the motivation of establishing this setup is the control of vibration modes of the flexible rotor - shaft assembly, while the rotational speed varies and the unbalanced mass on the whirling disc is introduced to the system. The proposed model is aimed to simulate real operation conditions of the rotating machinery with an applied external load, with a variable structure caused by a change of material properties of the rotor - shaft assembly, or due to a fault of some elements coupled with the rotor.

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Maximizing Network Utility of Rechargeable Sensor Networks with Spatiotemporally Coupled Constraints

Maximizing Network Utility of Rechargeable Sensor Networks w...

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作者： Deng, Ruilong Zhang, Yongmin He, Shibo Chen, Jiming Shen, Xuemin State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou310027 China Department of Electrical and Computer Engineering University of Waterloo WaterlooONN2L3G1 Canada

This paper studies the network utility maximization (NUM) problem in static-routing rechargeable sensor networks (RSNs) with the link and battery capacity constraints. The NUM problem is very challenging as these two constraints are typically coupling in RSNs, which cannot be directly tackled. Existing works either do not fully consider the two coupled constraints together, or heuristically remove the temporally coupled part, both of which are not practical, and will also degrade the network performance. In this paper, we attempt to jointly optimize the sampling rate and battery level by carefully tackling the spatiotemporally coupled link and battery capacity constraints. To this end, we first decouple the original problem equivalently into separable subproblems by means of dual decomposition. Then, we propose a distributed algorithm in the context of joint rate and battery control, called decouple spatiotemporally-coupled constraint (DSCC), which can converge to the globally optimal solution. Numerical results, based on the real solar data, demonstrate that the proposed algorithm always achieves higher network utility than existing approaches. In addition, the impact of link/battery capacity and initial battery level on the network utility is further investigated. © 2016 IEEE.

关键词： Optimization

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Human vehicle interaction

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AIP Conference Proceedings 2017年第1期1836卷

作者： Zdenek Slanina Sarka Mikolajkova David Vala 1Department of cybernetics and biomedical engineering Faculty of electrical engineering and computer science VSB - Technical University of Ostrava 17. listopadu 15 Czech Republic

This paper is focused on technique of strain gauge measuring forces which are transmitted between human and the vehicle. First part is based on theoretical analysis of acting forces and their effect to the vehicle. Second part is dealing with the practical realization measuring equipment and design own measuring device. Last section includes description of experiment and the analysis of collected data.

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Numerical solution of a two dimensional elliptic-parabolic equation with Dirichlet-Neumann condition

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AIP Conference Proceedings 2018年第1期1997卷

作者： Allaberen Ashyralyev Okan Gercek Emel Zusi 1Department of Mathematics Near East University Nicosia TRNC Mersin 10 Turkey 2Peoples’ Friendship University of Russia (RUDN University) Moscow 117198 Russia 3Institute of Mathematics and Mathematical Modeling 050010 Almaty Kazakhstan 4Department of Computer Engineering Girne American University Kyrenia TRNC Mersin 10 Turkey 5Department of Mathematics Luigj Gurakuqi University Shkoder Albania

In the present paper, a two dimensional elliptic-parabolic equation with Dirichlet-Neumann boundary condition is studied. The first and second order of accuracy difference schemes for the numerical solution of this problem are presented. Illustrative numerical results of these difference schemes are provided by using a procedure of modified Gauss elimination method.

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