检索结果-内蒙古大学图书馆

UPB Scientific Bulletin, Series C: Electrical engineering and Computer Science 2020年第4期82卷 41-54页

作者： Secuianu, Florin-Dan Lupu, Ciprian Dept. of Automatic Control and Systems Engineering University POLITEHNICA of Bucharest Romania

This paper is a continuation of our previous studies on the implementation of a mobile platform based on computer vision and Raspberry Pi hardware, precise indoor navigation. Thus, we implemented a prototype version of a robot that can recognize targets using machine learning and computer vision based algorithms. Further, the platform was improved to achieve complete autonomy, indoor mapping and navigation, and self-charging. We showed that it is possible to create an affordable, completely autonomous robot that can navigate and detect targets. The present study has two main objectives. The first one is to build a platform that uses computer vision algorithms to detect objects, processes and aggregates the information acquired from various sensors, shares it with other devices, and has capabilities of remote and automated reconfiguration of the main program loop and logging results. The second objective is to improve the precision of the localization and navigation by adjusting the data received from the digital compass to the specifics of the environment and the hardware setup of the mobile unit. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： Python

来源：评论

学校读者我要写书评

暂无评论

Grid-following three-phase inverter with RMS current-limiting property 12

Grid-following three-phase inverter with RMS current-limitin...

引用

12th Mediterranean Conference on Power Generation, Transmission, Distribution and Energy Conversion, MEDPOWER 2020

作者： Skentzos, Panagiotis Konstantopoulos, George C. Dept. of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Dept. of Electrical and Computer Engineering University of Patras Rio26504 Greece

ISBN: (纸本)9781839535635

A novel nonlinear controller that inherently limits the RMS value of a three-phase grid-following inverter current is presented in this paper. Using the dynamic model of the inverter in the rotating dq reference frame, a nonlinear control scheme is formulated to ensure accurate real and reactive power regulation with RMS current limitation that avoids the use of saturation units with upper/lower limit adaptation, as commonly used in the existing approaches. In particular, it is analytically proven by using fundamental nonlinear systems theory, that the RMS value of the inverter current will never violate a given maximum value, both during the transient response and at the steady-state. Moreover, a detailed root locus analysis is provided to guarantee the asymptotic stability of the desired equilibrium point for the closed-loop system. Finally, to validate the proposed controller performance, simulation results of a grid-following three-phase inverter equipped with the proposed control approach are presented under both normal and unrealistic values of the real and reactive power setpoints. © 2020 Institution of engineering and Technology. All rights reserved.

关键词： Asymptotic stability

来源：评论

学校读者我要写书评

暂无评论

Study of the Influence of Rolling Modes on the Operation of Interconnected Electric Drives of a Rolling Mill

Study of the Influence of Rolling Modes on the Operation of ...

引用

Advanced Technology (KhPIWeek), IEEE KhPI Week on

作者： Valerii Tytiuk Alexey Kalinin Valeriy Druzhinin Victor Busher Oleksii Chornyi Dmytro Halushko Department of Electromechanics Kryvyi Rih National University Kryvyi Rih Ukraine Department of Informative computer systems Abylkas Saginov Karaganda Technical University NPJSC Karaganda The Republic of Kazakhstan Department of Power Engineering Karaganda Industrial University NPJSC Temirtau The Republic of Kazakhstan Dept. of Electrical Engineering and Electronics National University “Odessa Maritime Academy” Odessa Ukraine Institute of Electromechanics Energy Saving and Automatic Control Systems Kremenchuk Mykhailo Ostrogradskyi National University Kremenchuk Ukraine Dept. of Electrical Engineering Ukrainian State University of Science and Technologies Dnipro Ukraine

The paper is devoted to study of the influence of rolling modes on the performance of powerful interconnected electric drives of a hot rolling mill under the action of an electromagnetic coupling circuit between the electric drives of the roughing and finishing groups. The action of the electromagnetic coupling circuit manifests itself in the form of the influence of impact loads of synchronous electric drives on the angular velocity of direct current electric drives of the finishing group of the mill. The parameters of the electromagnetic coupling circuit are determined by the power supply scheme and equipment parameters. Values of impact loads applied to a synchronous motor depend on the rolling process parameters, in particular, the chemical composition of the rolled steel and the temperature of the ingot. The paper presents the results of calculating the rolling power for various rolling mode parameters. Using mathematical modeling in Simulink, numerical estimates of the influence of rolling modes on the magnitude of the voltage drop in the power supply unit and the drop in the angular velocity of the electric drive of the finishing group were obtained on the example of a wide-strip hot rolling mill 1700 of ArcelorMittal Temirtau JSC.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Stochastic optimization and risk problems

引用

UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2019年第3期81卷 185-196页

作者： Popescu, Dumitru Dimon, Catalin Petrescu-Nita, Alina Dept.of Automatic Control and Systems Engineering University POLITEHNICA of Bucharest Romania Dept.of Mathematical Methods and Models University POLITEHNICA of Bucharest Romania

The paper presents a procedure for solving stochastic optimization problems encountered in industrial control applications in which it is considered that random disturbances act directly on the parameters of the criterion function and/or on the restrictions that define the admissible domain. The objective is to construct this problem, and to reformulate it by an equivalent deterministic problem. This problem is introduced as a risk problem and is solved using appropriate non-linear mathematical programming techniques. In many cases the solution of the stochastic optimization problem represents the optimal decision for the control level in industrial applications. © 2019, Politechnica University of Bucharest. All rights reserved.

关键词： Mathematical programming

来源：评论

学校读者我要写书评

暂无评论

Study of the Shock Loads Effect on the Operation of Multi-Motor Electric Drives of a Rolling Mill with a Second-order Elastic Coupling

Study of the Shock Loads Effect on the Operation of Multi-Mo...

引用

International Conference on Modern Electrical and Energy systems (MEES)

作者： Valerii Tytiuk Alexey Kalinin Valeriy Druzhinin Vitalii Kuznetsov Oleksii Chornyi Victor Busher Department of Electromechanics Kryvyi Rih National University Kryvyi Rih Ukraine Department of Informative Computer Systems Abylkas Saginov Karaganda Technical University NPJSC Karaganda The Republic of Kazakhstan Department of Power Engineering Karaganda Industrial University NPJSC Temirtau The Republic of Kazakhstan Department of the Electrical Engineering Ukrainian State University of Science and Technologies Dnipro Ukraine Institute of Electromechanics Energy Saving and Automatic Control Systems Kremenchuk Mykhailo Ostrogradskyi National University Kremenchuk Ukraine Dept. of Electrical Engineering and Electronics National University "Odessa Maritime Academy" Odessa Ukraine

This paper presents a study for optimizing a hot rolling mill. The paper is devoted to the study of ways to reduce the effect of shock loads of synchronous electric drives of the roughing mill group on the relative lengthening of the metal strip in the inter-stand gap of the rolling stands of the finishing mill group. The elasticity of the metal strip in the inter-stand gap of the rolling mill has a significant impact on the movement of intercoupled multi-motor electric drives of the finishing mill group. Another crucial route of exposure that influences the motion of the electric drives within the finishing mill group involves the electromagnetic connection between the drives in the roughing and finishing mill groups. The impact of the electromagnetically connected circuits is evident through the effect of shock loads from synchronous electric drives on the angular velocity of the direct current electric drives within the finishing mill group. The characteristics of the electromagnetic communication circuit are established by the power grid arrangement and equipment specifications. To assess the quality of work of electric drives of the finishing mill group, it is proposed to use the relative lengthening of the metal strip in the inter-stand gap, which is an important indirect indicator of the quality of rolling. The mathematical model of a hot rolling mill that takes into account both the elasticity of the metal strip that connects the DC electric drives of the finishing group, and the electromagnetic coupling circuit that takes into account the impact loads of synchronous electric drives of the roughing group on the example of the mill 1700 of ArcelorMittal Temirtau JSC was proposed in this paper. Using the mathematical model developed in Simulink software using the methods of planning the experiment, regression models were obtained to establish the dependence of the parameters of overexcitation of a synchronous motor on the magnitude of the voltage sag in the no

关键词：

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Students' Learning Based on Cybernetic Models with Differential Equations of Fractional Order

Evaluation of Students' Learning Based on Cybernetic Models ...

引用

2021 International e-engineering Education Services Conference, e-engineering 2021

作者： Busher, Victor Chornyi, Oleksii Herasymenko, Larisa Tytyuk, Valeriy Khandakji, Kamal Zakis, Janis National University "odessa Maritime Academy" Dept. of Electrical Engineering and Electronics Odessa Ukraine Kremenchuk Mykhailo Ostrohradskyi National University Institute of Electromechanics Energy Saving and Automatic Control Systems Kremenchuk Ukraine Kryvyi Rih Technical University Dept. of Electromechanics Kryvyi Rih Ukraine Tafila Technical University Department of Electrical Power and Mechatronics Tafila Jordan Riga Technical University Institute of Industrial Electronics and Electrical Engineering Riga Latvia

ISBN: (纸本)9781728134703

In this paper, the implementation of a cybernetic learning model based on differential equations of fractional order is justified. Experimental learning results were obtained by testing students during the academic semester. Based on a heterogeneous differential equation with integer order, learning graphs have been compared to a family of models with fractional order equations. Consequently, fractional-order equations are proved to have better approximation properties. Criteria for assessing the learning and differentiation of teaching methods based on the parameters of fractional order equations are proposed. © 2021 IEEE.

关键词： Differential equations

来源：评论

学校读者我要写书评

暂无评论

Client-server Mobile System for Diagnosis of Asynchronous Motors

Client-server Mobile System for Diagnosis of Asynchronous Mo...

引用

Advanced Technology (KhPIWeek), IEEE KhPI Week on

作者： Olha Chorna Petro Kurliak Victor Busher Oleksii Chornyi Valerii Tytiuk Iurii Zachepa Institute of Education and Science in Electrical Engineering and Information Technologies Kremenchuk Mykhailo Ostrogradskyi National University Kremenchuk Ukraine Department of Electrical power engineering electrical engineering and electromechanics Ivano-Frankivsk National Technical University of Oil and Gas Ivano-Frankivsk Ukraine Dept. of Electrical Engineering and Electronics National University “Odessa Maritime Academy” Odessa Ukraine Department of Electromechanics Kryvyi Rih National University Kryvyi Rih Ukraine Department of Systems of Automatic Control and Electric Drive Kremenchuk Mykhailo Ostrohradskyi National University Kremenchuk Ukraine

This paper presents client-server mobile system for diagnosis of asynchronous motors. The system is created as a mobile application for smartphones and tablets. The system provides processing of the measured values of the currents and voltages of the stator phases of the asynchronous motor. According to the processing results, the results of diagnostics and forecasting of the current state of asynchronous motors are calculated. The software runs on the Android OS. The main purpose is to predict the current state of AD, which has a parametric electromagnetic asymmetry of the stator phases.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Robust Interval Criterion for a Steady Value 30

Robust Interval Criterion for a Steady Value

引用

30th International Scientific Symposium Metrology and Metrology Assurance, MMA 2020

作者： Bekhtin, Y.S. Lupachev, A.A. Kyaw, N.M. Kovalenko, A.V. Petsinyarzh, A.R. National Research University Moscow Power Engineering Institute' Dept. of Diagnostics and Measurement Technologies Moscow Russia Moscow State Technical University Named after N. Bauman Dept. of Automatic Control Systems Moscow Russia

ISBN: (纸本)9781728197197

The work is a development of the interval criterion for determining the moment when the steady-state value of the transition signal occurs. These criteria are used in technologies related to testing complex objects under conditions of parametric uncertainty of its model. The transient signal is analyzed in on-line mode. Therefore, the accuracy of the decision about the time of the end of the tests determines the cost of conducting them. Such tests are characterized by significant dynamic errors that significantly exceed the allowed level. The reasons for this are the parametric uncertainty in the mathematical model of the object and the inability of the deterministic interval criterion to correctly issue a solution under these conditions. It was previously determined that the interval criterion is characterized by the presence of an asymptotic critical value of the criterion. Exceeding the object's real time constant over the critical value gives a false positive result. This situation is characterized by the fact that the desired moment is falsely determined significantly earlier than the optimal solution. You can avoid this situation if you set the criteria to the maximum constant of the object's time. However, this choice leads to significant time losses when analyzing the transition signal. The solution of the problem of guaranteed provision of a given level of dynamic error over the entire range of values of the object model parameter is possible using a robust algorithm. The basis for constructing a robust criterion is to control the duration of the observation interval. For this purpose, the current information about the analyzed signal is used. There are three ways to apply the current information. The first approach is based on the use of an extrapolated estimate of the established value. This allows you to determine the estimate of the current dynamic error and prevent a falsely positive decision of the criterion. The second approach is based on the analys

关键词： analysis of the transition process duration of the observation interval duration of the transition process dynamic error analysis false positive solution robust algorithm

来源：评论

学校读者我要写书评

暂无评论

Data-injection attacks

arXiv

引用

arXiv 2021年

作者： Esnaola, Iñaki Perlaza, Samir M. Sun, Ke Dept. of Automatic Control and Systems Eng. University of Sheffield United Kingdom INRIA Centre de Recherche de Sophia Antipolis-Méditerranée France Department of Electrical Engineering Princeton University United States

来源：评论

学校读者我要写书评

暂无评论

Visualisation of the Maturity of Future Electrical Engineers Professional Competencies 20

Visualisation of the Maturity of Future Electrical Engineers...

引用

20th IEEE International Conference on Modern Electrical and Energy systems, MEES 2021

作者： Chornyi, Oleksii Herasymenko, Larysa Tytiuk, Valerii Bigdan, Maryna Busher, Victor Kremenchuk Mykhailo Ostrohradskyi National University Institute of Electromechanics Energy Saving and Automatic Control Systems Kremenchuk Ukraine Pedagogy and Philosophy Kremenchuk Mykhailo Ostrohradskyi National University Department of Psychology Kremenchuk Ukraine Kryvyi Rih National University Department of Electromechanics Kryvyi Rih Ukraine Kremenchuk Mykhailo Ostrohradskyi National University Department of Branch Legal Sciences Kremenchuk Ukraine National University 'Odessa Maritime Academy' Dept. of Electrical Engineering and Electronics Odessa Ukraine

ISBN: (纸本)9781665423663

the article considers the actual problem of pedagogical diagnostics of the professional competencies' maturity on the example of students of engineering specialties. The initial data were obtained as a result of experimental studies while which various diagnostic tools for the assessment of students training quality were used. The authors have suggested a method for the diagnostics of professional competencies which is based on the principle of tasks being differentiated in accordance with the defined competencies, and which allows us to obtain more reliable information about the level of their maturity. Also, there have been presented the code fragments of the developed modelling software aimed at the creation of a visual image being the result of the competencies diagnostics. © 2021 IEEE.

关键词： Visualization

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：