检索结果-内蒙古大学图书馆

International Conference on Electrical Machines

作者： Stipetić, Stjepan Kovačić, Marinko Hanić, Zlatko Department of Electric Machines Drives and Automation Faculty of Electrical Engineering and Computing University of Zagreb Croatia

ISBN: (纸本)9781424441754

Excitation winding temperature is used for determination of the dynamic limit in the P-Q diagram of a synchronous generator. The surface temperature of an excitation winding can be measured by an infrared (IR) thermometer. Due to rotation, the IR thermometer absorbs thermal radiation from the excitation winding on the salient pole and from the interpolar space as well. These two surfaces can have different temperature or emissivity, which both affect the amount of the thermal radiation radiated towards the sensor of the IR thermometer. Irradiation read by the sensor is therefore the average irradiation of a rotating rotor. This irradiation results in the temperature that differs from the pole surface temperature. The difference depends on the interpolar space size, emissivity and temperature. The effect of the interpolar space can be cancelled if the IR thermometer is positioned at a certain angle with respect to machine's main axis. Temperature sensors have been mounted on the rotor to measure the excitation winding surface temperature for comparison. ©2010 IEEE.

关键词： Surface temperature

来源：评论

学校读者我要写书评

暂无评论

Two-layer networked learning control using self-learning fuzzy control algorithms

引用

仪器仪表学报 2007年第12期28卷 2124-2131页

作者： Du Dajun Fei Minrui Hu Huosheng Li Lixiong School of Mechatronical Engineering and Automation Shanghai University Shanghai 200072 China Department of Computing ＆ Electronic Systems University of Essex Colchester C04 3SQU. K.

Since the existing single-layer networked control systems have some inherent limitations and cannot effectively handle the problems associated with unreliable networks, a novel two-layer networked learning control system (NLCS) is proposed in this paper. Its lower layer has a number of local controllers that are operated independently, and its upper layer has a learning agent that communicates with the independent local controllers in the lower layer. To implement such a system, a packet-discard strategy is firstly developed to deal with network-induced delay and data packet loss. A cubic spline interpolator is then employed to compensate the lost data. Finally, the output of the learning agent based on a novel radial basis function neural network (RBFNN) is used to update the parameters of fuzzy controllers. A nonlinear heating, ventilation and air-conditioning (HVAC) system is used to demonstrate the feasibility and effectiveness of the proposed system.

关键词：自学习模糊控制算法双层网络学习控制系统径向基函数神经网络三次样条校对机

来源：评论

学校读者我要写书评

暂无评论

Real time interactive image segmentation using user indicated real-world seeds

Real time interactive image segmentation using user indicate...

引用

25th Conference on Graphics, Patterns and Images, SIBGRAPI 2012

作者： Gomes, Rafael Beserra Aroca, Rafael Vidal De Carvalho, Bruno Motta Goncalves, Luiz Marcos Garcia Department of Computing Engineering and Automation UFRN Natal Brazil Department of Informatics and Applied Mathematics UFRN Natal Brazil

ISBN: (纸本)9780769548296

We propose a novel and fast interactive segmentation methodology for computer vision applications. Basically, the proposed system performs the tracking of seeds so that multiple seeds can be acquired over time, substantially improving the segmentation results. Moreover, instead of image coordinates, the user indicates points in the real-world that become seeds in the image. These seeds can be indicated, for example using a laser pointer or a smart-phone. The seeds can then be tracked and used by a segmentation algorithm. Experiments using the Lucas-Kanade Optical Flow and the Fast Multi-Object Fuzzy Segmentation (Fast-MOFS) algorithm demonstrate that the proposed technique successfully segments images in real-time and improves the user ability to directly segment an object in the real world. The proposed system has a high performance, allowing it to be used with high frame rates in devices with low processing capability and/or with restricted power requirements. © 2012 IEEE.

关键词： Computer vision

来源：评论

学校读者我要写书评

暂无评论

Lossless and lossy compression in 4D bio-modeling

Lossless and lossy compression in 4D bio-modeling

引用

1st International Conference on Information and Communication Technology and Accessibility, ICTA 2007

作者： Žagar, Martin Kovac, Mario Bosnic, Ivana Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing Unska 3 HR-10000 Zagreb Croatia

ISBN: (纸本)9789973879141

Bio-modeling has important role in virtual reality in telemedicine providing base for simulations and decisions. Virtual reality is based on sequences of volumetric images whose motion is captured in time. These data sets are typically very large in size and demand a great amount of resources for storage and transmission. Therefore it is necessary to compress this data both fast and efficiently. We will propose combination of lossless and lossy compression models to obtain toset demands.

关键词： Virtual reality

来源：评论

学校读者我要写书评

暂无评论

The Combination of Two Control Strategies for Series Hybrid Electric Vehicles

引用

IEEE/CAA Journal of Automatica Sinica 2019年第2期6卷 596-608页

作者： Can Luo Zhen Shen Simos Evangelou Gang Xiong Fei-Yue Wang State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Cloud Computing Center Chinese Academy of Sciences IEEE Department of Electrical and Electronic Engineering Imperial College London Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Qingdao Academy of Intelligent Industries

With most countries paying attention to the environment protection, hybrid electric vehicles have become a focus of automobile research and development due to the characteristics of energy saving and low emission. Power follower control strategy(PFCS) and DC-link voltage control strategy are two sorts of control strategies for series hybrid electric vehicles(HEVs). Combining those two control strategies is a new idea for control strategy of series hybrid electric vehicles. By tuning essential parameters which are the defined constants under DClink voltage control and under PFCS, the points of minimum mass of equivalent fuel consumption(EFC) corresponding to a series of variables are marked for worldwide harmonized light vehicles test procedure(WLTP). The fuel economy of series HEVs with the combination control schemes performs better compared with individual control scheme. The results show the effects of the combination control schemes for series HEVs driving in an urban environment.

关键词： DC-Link voltage control power follower control strategy series hybrid electric vehicles tuning

来源：评论

学校读者我要写书评

暂无评论

Flying Start of a Synchronous Reluctance Machine Based on Opposite Active Voltage Pulses

Flying Start of a Synchronous Reluctance Machine Based on Op...

引用

2024 International Conference on Electrical Machines, ICEM 2024

作者： Pravica, Luka Jukic, Filip Sumina, Damir Erceg, Igor University of Zagreb Faculty of Electrical Engineering and Computing Department of Electric Machines Drives and Automation Zagreb Croatia

ISBN: (纸本)9798350370607

Synchronous reluctance machines (SynRMs) are increasingly used in various applications, such as energy conversion systems and electric drives. In addition to standard control algorithms, some of these applications also require the implementation of flying start methods that aim to estimate the rotor speed and angle before the SynRM is connected to the converter. In this way, synchronization between the SynRM and the converter is achieved, and the inrush current is reduced. This paper proposes a new method for the flying start of SynRMs based on symmetric and opposite active voltage vectors and a second-order generalized integrator (SOGI) with a frequency-locked loop (FLL). Applying such a voltage vector pattern to the terminals of a rotating SynRM induces phase current spikes whose sampled counterparts have a sinusoidal waveform. According to the derived mathematical model of the SynRM in the stationary αβ reference frame, the induced β-axis current contains no DC offset and is therefore passed to the SOGI-FLL structure to estimate the rotor angle and speed. Moreover, applying the opposite active vectors ensures a lower current distortion, guarantees the accuracy of the estimation and reduces the generated torque. The proposed method was verified by simulations in Matlab Simulink. © 2024 IEEE.

关键词： Electric drives

来源：评论

学校读者我要写书评

暂无评论

Minimum loss control of interior permanent magnet traction motor

Minimum loss control of interior permanent magnet traction m...

引用

IEEE International Electric Machines and Drives Conference, IEMDC 2015

作者： Jercic, Tino Zarko, Damir Matusko, Jadranko Martinovic, Marijan University of Zagreb Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation Zagreb Croatia

ISBN: (纸本)9781479979417

This paper presents a new formulation for minimization of copper and iron losses in interior permanent magnet for the purpose of minimum loss control. Motor losses are formulated based on electromagnetic torque to total torque ratio resulting in simplified expression of minimal loss condition which can be easily solved online. The flux-weakening method which adjusts electromagnetic to total torque ratio in order to achieve field weakening operation is also proposed. © 2015 IEEE.

关键词： electric vehicles energy efficiency function approximation minimization Newton method optimization permanent magnet machines temperature dependence variable speed drives

来源：评论

学校读者我要写书评

暂无评论

Temperature distribution measurement of a battery pack's segment in a controlled testing environment 7

Temperature distribution measurement of a battery pack's seg...

引用

7th IEEE International Energy Conference, ENERGYCON 2022

作者： Premec, Antun Magas, Lovro Kristek, Hrvoje Vrazic, Mario University of Zagreb Drives and Automation Faculty of Electrical Engineering and Computing Department of Electric Machines Zagreb Croatia

ISBN: (纸本)9781665479820

To ensure operational safety and effective utilization of a battery pack it is important to determine temperature level and temperature distribution across its battery cells. This paper as the first of a series of papers, presents a battery pack segment ls7p testing environment for the purpose of measuring, not only the temperature of each cell, but also the voltage and current of the entire segment. The segment's cells are thoroughly monitored with three temperature sensors per cell to get the most accurate thermal distribution available. After developing and building the battery pack segment, it is placed in a temperature controlled test chamber, so it can be tested at different temperature levels. Future articles, will describe the segment's thermal image during charging and discharging. The goal of this paper is to present the accuracy of this testing environment, this must be done without charging or discharging the segment. It is necessary to measure and calculate the temperature sensor's characteristics, accuracy and offsets, as well as the monitoring system's sampling time, lag time and any lag time that is generated in the data processing step. With this information, certain measurement compensations can be made (if necessary) for future tests and experiments. © 2022 IEEE.

关键词： Temperature measurement

来源：评论

学校读者我要写书评

暂无评论

Sizing of Supercapacitor-based Energy Storage System for Elevator Applications 1

Sizing of Supercapacitor-based Energy Storage System for Ele...

引用

1st IEEE Industrial Electronics Society Annual On-Line Conference, ONCON 2022

作者： Godec, Damjan Pravica, Luka Kutija, Martina Makar, Martin Drives and Automation University of Zagreb Faculty of Electrical Engineering and Computing Department of Electric Machines Zagreb Croatia

ISBN: (纸本)9798350398069

Energy storage systems based on supercapacitors have become attractive solutions for improving elevator efficiency. Electrical energy is stored while the elevator drive is running in generator mode and used when needed. The energy storage system can also be charged in standby mode and used to reduce power peaks during start-up. Therefore, the energy storage system should be appropriately sized, which is not trivial since elevator usage is stochastic in nature. In this paper, the effect of energy storage system size on the efficiency of regenerative energy reuse is analyzed based on a measurement study. Measurements were performed for one week on faculty elevators under real conditions. The data obtained from the measurements were analyzed, and the results of the analysis of energy consumption, elevator starts, and potential energy savings were presented for all three elevators and the group. The elevator energy storage system was emulated in MATLAB with and without energy consumption balancing which is used to reduce peak power. The efficiency of regenerative energy reuse is calculated for a wide range of energy storage sizes, both with and without energy consumption balancing, for all individual elevators and the group. © 2022 IEEE.

关键词： Elevators

来源：评论

学校读者我要写书评

暂无评论

Towards semantic and affective coupling in emotionally annotated databases

Towards semantic and affective coupling in emotionally annot...

引用

35th International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2012

作者： Horvat, M. Popović, S. Ćosić, K. Faculty of Electrical Engineering and Computing University of Zagreb Department of Electric Machines Drives and Automation Zagreb Croatia

ISBN: (纸本)9789532330724

Emotionally annotated databases are repositories of multimedia documents with annotated affective content that elicit emotional responses in exposed human subjects. They are primarily used in research of human emotions, attention and development of stress-related mental disorders. This can be successfully exploited in larger processes like selection, evaluation and training of personnel for occupations involving high stress levels. Emotionally annotated databases are also used in multimodal affective user interfaces to facilitate richer and more intuitive human-computer interaction. Multimedia documents in emotionally annotated databases must have maximum personal ego relevance to be the most effective in all these applications. For this reason flexible construction of subject-specific of emotionally annotated databases is imperative. But current construction process is lengthy and labor intensive because it inherently includes an elaborate tagging experiment involving a team of human experts. This is unacceptable since the creation of new databases or modification of the existing ones becomes slow and difficult. We identify a positive correlation between the affect and semantics in the existing emotionally annotated databases and propose to exploit this feature with an interactive relevance feedback for a more efficient construction of emotionally annotated databases. Automatic estimation of affective annotations from existing semantics enhanced with information refinement processes may lead to an efficient construction of high-quality emotionally annotated databases. © 2012 MIPRO.

关键词： Semantics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：