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33rd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2010

作者： Burul, Ivan Kolonić, Fetah Matuško, Jadranko Department of Electric Machines Drives and Automation Faculty of Electrical Engineering and Computing Unska 3 Zagreb Croatia

ISBN: (纸本)9789532330502

This paper describes a robust controller design procedure based on H ∞ control theory for translational mechatronic system, trolley with pendulum. The goal is to achieve fast trolley positioning with minimization of pendulum swinging. This system, trolley with pendulum, represents gantry crane. Minimization of the load transfer time and load swing angle in the crane applications are conflicting control demands and thus proper control action is required. However, friction effect is unavoidable in mechanical parts of the system and significantly influences the control system performances. In this paper H∞ theory based crane controller is designed in order to minimize friction effect. H∞ controller has been tested and compared with the pole placement controller on a laboratory gantry crane model.

关键词： Pendulums

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Effects of dead time and semiconductor device voltage drops of output voltage of multilevel converters 38

Effects of dead time and semiconductor device voltage drops ...

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38th International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2015

作者： Mrčela, Ivan Šunde, Viktor Kovačić, Marinko University of Zagreb Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation Zagreb Croatia

ISBN: (纸本)9789532330854

This paper presents the results of a study of the effect of dead time and finite semiconductor device voltage drops on the output voltage of three-level neutral point clamped power converters. Results showed that finite voltage drops and dead time caused a DC voltage shift, and lowered the base harmonic amplitude of output voltage. These effects were analysed and the results confirmed via simulation models. Voltage drops effect was confirmed using Ansys Simplorer, while the dead time effect was confirmed using Matlab. The results showed that the output voltage of the three-level neutral point clamped converters was dependant on the listed parameters. A method is proposed to suppress the negative effects these parameters have on converter voltage. © 2015 MIPRO.

关键词： Power converters

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Operating limits of underexcited synchronous generator

Operating limits of underexcited synchronous generator

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2013 4th International Conference on Power engineering, Energy and Electrical Drives, POWERENG 2013

作者： Maljkovic, Zlatko Gasparac, Ivan University of Zagreb Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation Zagreb Croatia

ISBN: (纸本)9781467363921

Standard power chart of synchronous generator has its limit defined by practical stability limit and by field current minimum in the underexcitation quadrant. However, during the time, some generators have shown certain sensitivity during the permanent underexcited operation even in the stabile operating area due to local heating of magnetic conductive parts in the end region of the machine. Underexcited operation is usually required in case of raised network voltage while the active power demands are lowered. Precise knowledge of limits of underexcited operation ability enables precise planning of system reactive power trading. Some world experiences and axial magnetic field measurements in the end region of synchronous hydro and turbine generator are presented. Based on mentioned measurements, it is possible to define real power chart which almost always deviates in capacitive operating area compared to manufacturer's diagram. © 2013 IEEE.

关键词： Turbogenerators

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Spectral calculation of the output voltage of an inverter with unipolar pulse width modulation

Spectral calculation of the output voltage of an inverter wi...

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33rd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2010

作者： Mrčela, Ivan Šunde, Viktor Benčić, Zvonko Department of Electric Machines Drives and Automation Faculty of Electrical Engineering and Computing Unska 3 Zagreb Croatia

ISBN: (纸本)9789532330502

Inverters with pulse width modulation are used for connecting DC and AC networks, e.g. in uninterrupted power supply systems, AC electromotor drives, for powering induction furnaces, in audio technique. The output voltage spectrum of inverters with unipolar pulse width modulation in the case of triangular carrier signal contains a harmonic with frequency equal to the frequency of the modulating signal. It also contains harmonics with frequencies equal to the sum of frequency of the modulating signal and a multiple of double the frequency of the carrier signal. Analysis of the inverter's output voltage harmonics was performed in time domain via development of the inverter's output voltage waveform into a sum of periodical waveforms and by calculating spectrums of each individual part. The dependency of the amplitudes and frequency spectra on the wave forms of the carrier signal and modulating signal was demonstrated.

关键词： Fourier series

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Hybrid Bayesian estimation tree learning with discrete and fuzzy labels

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Frontiers of Computer Science 2013年第6期7卷 852-863页

作者： Zengchang QIN Tao WAN Intelligent Computing and Machine Learning Lab School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China School of Biological Science and Medical Engineering Beihang University Beijing 100191 China Department of Biomedical Engineering Case Western Reserve University Cleveland OH 44106 USA

Classical decision tree model is one of the classical machine learning models for its simplicity and effectiveness in applications. However, compared to the DT model, probability estimation trees （PETs） give a better estimation on class probability. In order to get a good probability estimation, we usually need large trees which are not desirable with respect to model transparency. Linguistic decision tree （LDT） is a PET model based on label semantics. Fuzzy labels are used for building the tree and each branch is associated with a probability distribution over classes. If there is no overlap between neighboring fuzzy labels, these fuzzy labels then become discrete labels and a LDT with discrete labels becomes a special case of the PET model. In this paper, two hybrid models by combining the naive Bayes classifier and PETs are proposed in order to build a model with good performance without losing too much transparency. The first model uses naive Bayes estimation given a PET, and the second model uses a set of small-sized PETs as estimators by assuming the independence between these trees. Empirical studies on discrete and fuzzy labels show that the first model outperforms the PET model at shallow depth, and the second model is equivalent to the naive Bayes and PET.

关键词： fuzzy labels label semantics random set probability estimation tree mass assignment linguistic decision tree naive Bayes

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Black Hole and Sink Hole Attack Detection in Wireless Body Area Networks

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Computers, Materials & Continua 2021年第8期68卷 1949-1965页

作者： Rajesh Kumar Dhanaraj Lalitha Krishnasamy Oana Geman Diana Roxana Izdrui School of Computing Science and Engineering Galgotias University201310India Department of Information Technology Kongu Engineering CollegeErode638060India Department of Health and Human Development Stefan cel Mare UniversityRomania Department of Computers Electronics and AutomationStefan cel Mare UniversityRomania

In Wireless Body Area Networks(WBANs)with respect to health care,sensors are positioned inside the body of an individual to transfer sensed data to a central station *** great challenges posed to healthcare WBANs are the black hole and sink hole *** from deployed sensor nodes are attracted by sink hole or black hole nodes while grabbing the shortest *** this issue is quite a challenging task as a small variation in medicine intake may result in a severe *** work proposes a hybrid detection framework for attacks by applying a Proportional Coinciding Score(PCS)and an MK-Means algorithm,which is a well-known machine learning technique used to raise attack detection accuracy and decrease computational difficulties while giving treatments for heartache and respiratory ***,the gathered training data feature count is reduced through data pre-processing in the ***,the pre-processed features are sent to the MK-Means algorithm for training the data and promoting ***,certain attack detection measures given by the intrusion detection system,such as the number of data packages trans-received,are identified by the MK-Means *** study demonstrates that the MK-Means framework yields a high detection accuracy with a low packet loss rate,low communication overhead,and reduced end-to-end delay in the network and improves the accuracy of biomedical data.

关键词： Wireless body area network black hole attack sink hole attack proportional coinciding score intrusion detection correlation rate

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Robust adaptive control of hypersonic flight vehicle with asymmetric AOA constraint

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Science China(Information Sciences) 2020年第11期63卷 195-207页

作者： Yuyan GUO Bin XU Weixin HAN Shuai LI Yueping WANG Yu ZHANG School of Automation Northwestern Polytechnical University Department of Computing The Hong Kong Polytechnic University Flight Automatic Control Research Institute State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang University

This paper investigates the state-constrained controller design of a hypersonic flight vehicle(HFV) based on an asymmetric barrier Lyapunov function(ABLF). The robust adaptive back-stepping controller with integral terms is applied for the HFV longitudinal dynamics. Considering the asymmetric angle of attack(AOA) constraint caused by the unique structure and scramjet, the controller is modified by constructing an ABLF, where the asymmetric constraint on AOA tracking error is introduced. Combined with the constraint on virtual control, the AOA is restricted to a predefined asymmetric interval. The system stability and the AOA constraint are guaranteed via Lyapunov analysis. Simulation results verify that the AOA can be kept in the given asymmetric interval while the altitude reference signal is tracked.

关键词： hypersonic flight vehicle HFV integral back-stepping control adaptive control asymmetric barrier Lyapunov function ABLF angle of attack (AOA) constraint

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Modelling and experimental verification of device with a submerged evaporator for beer cooling 45

Modelling and experimental verification of device with a sub...

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45th Jubilee International Convention on Information, Communication and Electronic Technology, MIPRO 2022

作者： Sare, Nina Komljen, Branimir Vuletic Matusko, Jadranko Osman, Kresimir Zagreb University of Applied Sciences Department of Electrical Engineering Croatia Faculty of Electrical Engineering and Computing Department of Electric Machines Drives and Automation Croatia

ISBN: (纸本)9789532331035

The paper presents a mathematical model of a submerged evaporator laboratory plant for cooling beer. The model is derived as a system with distributed parameters of the counterclockwise type. Additionally, the results of the experimental testing of the submerged evaporator laboratory plant are presented and based on such simplified a static model is identified, which is suitable for control system design. © 2022 Croatian Society MIPRO.

关键词： Beer

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Semi-reference image quality metric for virtual view images in free-viewpoint television

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High Technology Letters 2009年第4期15卷 394-400页

作者：杨铀 Jiang Gangyi Yu Mei Shao Feng Zhang Yun Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 Faulty of Information Science and Engineering Ningbo University Ningbo 315211 Department of Automation Tsinghua University Beijing 100084

A semi-reference image quality assessment metric based on similarity measurement for synthesized virtual viewpoint image （VVI） in free-viewpoint television system （FFV） is proposed in this paper. The key point of the proposed metric is taking resemblant information between VVI and its neighbor view images for quality assessment to make our metric to be extended to multi-semi-reference image quality assessment easily. The proposed metric first extracts impact factors from image features, then combines an image synthesis technique and similarity functions, in which, disparity information are taken into account for registering the resemblant regions. Experiments are divided into three phases. Phase I is to verify the validation of the proposed metric by taking impaired images and original reference into account. The experimental results show the agreement between evaluation scores and bio-characteristic of human visual system. Phase II shows the accordance with Phase I by taking neighbor view as reference. The proposed metric can be taken as a full reference one to evaluate the image quality even though the original reference is absent. Phase III is then performed to evaluate the quality of WI. Evaluation scores in the experimental results are able to evaluate the quality of VVI.

关键词： image quality assessment virtual view image （VVI） free-viewpoint television （FTV） semi-relerence image quality metric

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Three-Phase SRF PLL Model for System Frequency Response Studies in Low-Inertia Systems 11

Three-Phase SRF PLL Model for System Frequency Response Stud...

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11th International Conference on Innovative Smart Grid Technologies - Asia, ISGT-Asia 2022

作者： Krpan, Matej Erceg, Igor Kuzle, Igor Pandžić, Hrvoje University of Zagreb Faculty of Electrical Engineering and Computing Department of Energy and Power Systems Zagreb Croatia Department of Electric Machines Drives and Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

ISBN: (纸本)9798350399660

This paper derives a small-signal model of a three-phase synchronous reference frame phase-locked loop for use in system frequency response studies assuming a system of balanced three-phase voltages. The small-signal model is described by a second-order transfer function which relates the actual to the estimated grid frequency. The small-signal model behaves identically to the large-signal model for small disturbances. Simulation results demonstrate that phase-locked loop dynamics can be neglected in the high-inertia scenarios, while in the low-inertia scenarios they have a significant impact on the grid frequency and should be included in models. © 2022 IEEE.

关键词： Phase locked loops

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