检索结果-内蒙古大学图书馆

International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Du, Xuehui Wang, Chunjie Chen, Peng Fu, Qiang School of Electrical Engineering and Automation Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9789819618675

In order to solve the fatigue problem of offshore floating photovoltaic direct current(DC) cable between floating blocks under the influence of wave motion, this paper proposes a method to evaluate the fatigue life of DC cable. On the basis of analyzing the fatigue damage mechanism of the DC cable, usingthe service life of the DC cable is accurately predicted by using the stress prediction method with the COMSOL finite element simulation software. By simulating stress conditions under different working conditions, the results show that: The fatigue life of DC cable across floating blocks is negatively correlated with the maximum equivalent stress, and the life decreases with the increase of displacement degree. The dangerous point of cable fatigue is near the fixed point at both ends of the cable. At the same time, the influence of different suspension lengths on the cable fatigue life is analyzed by simulation. The simulation results provide a useful design reference for optimizing cable layout and improving its service life. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Fatigue damage

来源：评论

学校读者我要写书评

暂无评论

含外圈剥落和不对中的齿轮-转子-轴承系统振动分析

引用

Journal of Central South University 2024年第2期31卷 511-525页

作者：徐宏阳赵翔马辉罗忠韩清凯闻邦椿 School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Vibration and Control of Aero-Propulsion System(Ministry of Education) Northeastern UniversityShenyang 110819China

轴承套圈的不对中和剥落是影响齿轮-转子-轴承系统振动特性的典型误差和故障。为了研究外圈不对中和剥落对系统的耦合影响,有必要对含不对中和剥落的齿轮-转子-轴承系统振动特性进行分析。首先,考虑外圈不对中和剥落,计算了轴承的五自... 详细信息

轴承套圈的不对中和剥落是影响齿轮-转子-轴承系统振动特性的典型误差和故障。为了研究外圈不对中和剥落对系统的耦合影响,有必要对含不对中和剥落的齿轮-转子-轴承系统振动特性进行分析。首先,考虑外圈不对中和剥落,计算了轴承的五自由度非线性恢复力。然后,基于轮齿承载接触分析(LTCA)方法,计算了啮合刚度并且建立了直齿轮副的动力学模型。在此基础上,基于切片法建立了花键的等效刚度模型。最后,通过将轴承的恢复力模型、直齿轮副的动力学模型和花键的等效刚度模型与转子系统的有限元模型耦合,建立了齿轮-转子-轴承系统的动力学模型。分析表明,只有剥落位于承载区时,才会对轴承接触力、接触角和系统振动特性产生影响。外圈的不对中导致轴承的承载区范围增大,并使得剥落对系统产生影响的概率增加。

关键词：球轴承不对中剥落振动特性齿轮-转子-轴承系统

来源：评论

学校读者我要写书评

暂无评论

Research on Sign Language Gesture Division and Gesture Extraction in Complex Background

Research on Sign Language Gesture Division and Gesture Extra...

引用

2022 International Conference on Computer Vision, Application, and Algorithm, CVAA 2022

作者： Tian, Yifan Han, Fangfang Zhu, Minfeng Xu, Xiaoliang Li, Yadong School of Electrical Engineering and Automation China Tianjin University of Technology Tianjin300384 China Tianjin Key Laboratory for Control Theory and Applications in Complicated Systems China

ISBN: (纸本)9781510664036

Sign language plays an important role in information transmission and emotional communication between deaf-mute people and the outside world. With the development of artificial intelligence technology, the recognition, translation and generation of sign language based on digital image processing have attracted worldwide attention. In the field of sign language recognition, effective hand division and gesture extraction are the first and key steps, which directly affect the accuracy of sign language recognition. In this paper, a hand information extraction method based on depth image processing is proposed to solve the problem of sign language gesture extraction in complex background. For sign language speakers,hands are at the front of their bodies, so the depth images of sign language speakers can be collected by depth camera, and the complex background can be removed and hand information can be extracted by segmenting different color objects in the depth images. In this paper, the D435i camera of Inter is used to capture the depth image of the sign language speaker, and the HSV color space model based on the digital image is used for threshold processing of the fusion of hue components and brightness components to achieve the division of the hand position;through median filtering and mathematical morphology of digital image, division noise is removed and interference is reduced. Through skeleton extraction algorithm, the gesture gesture can be obtained. Experiments show that the proposed acquisition scheme and algorithm flow in this paper can effectively realize hand position division and gesture extraction in complex background conditions, and provide a good foundation for subsequent gesture recognition and expression. © 2023 SPIE.

关键词： Morphology

来源：评论

学校读者我要写书评

暂无评论

Lateral-Longitudinal Prescribed-Time Cooperative control of Vehicles Subject to Wear and Road Disturbance 43

Lateral-Longitudinal Prescribed-Time Cooperative Control of ...

引用

43rd Chinese control Conference, CCC 2024

作者： Zhang, Qian Guo, Ge Northeastern University College of Information Science and Engineering Shenyang110819 China Northeastern University State Key Laboratory of Synthetical Automation of Process Industries Shenyang110819 China Northeastern University at Qinhuangdao School of Control Engineering Qinhuangdao066004 China

ISBN: (纸本)9789887581581

This paper studies the lateral and longitudinal formation control issue of a collection of vehicles subject to wear and road disturbance. A novel prescribed-time disturbance observer is designed to estimate the unknown disturbance. Then, based on the disturbance observer, an adaptive nonsingular vehicle formation control strategy is proposed to ensure the formation errors converge to a close neighborhood of origin in a prescribed time, which can be confirmed in advance by specifying several simple parameters. Simulation results validate the effectiveness of the presented control method. © 2024 Technical Committee on control Theory, Chinese Association of automation.

关键词： Vehicles

来源：评论

学校读者我要写书评

暂无评论

Critical Node Identification of Cyber-Physical Power Systems Based on Improved Fuzzy Analytic Hierarchy Process 41

Critical Node Identification of Cyber-Physical Power Systems...

引用

第41届中国控制会议

作者： Jian Li Yiqiang Li Qingyu Su School of Automation Engineering Northeast Electric Power University Jilin Provincial Key Laboratory of Advanced Control Technology of Smart Energy

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

Aiming at the present information security problems and the one-sidedness of vulnerability assessment indicators of cyber-physical power systems,an assessment model is proposed based on the improved fuzzy analytic hierarchy process to identify the critical nodes of the ***,an integrated model of the cyber-physical power system is established,and the cascading failure process after component failure of the power system is taken into ***,several assessment indicators considering two aspects of power flow character and structural safety are given.A three-scale method and the optimal transfer matrix are employed to improve the traditional analytic hierarchy process,and the fuzzy comprehensive evaluation is used to determine the final ***,the validity of the proposed method is verified on the model based on the IEEE 30-bus system.

关键词： cyber-physical power systems critical node identification improved fuzzy analytic hierarchy process cascading failure

来源：评论

学校读者我要写书评

暂无评论

Computational Study of Dirt's Effect on Solar Panel Efficiency

Computational Study of Dirt's Effect on Solar Panel Efficien...

引用

Power Electronics and control (SEPOC), Seminar on

作者： Daniel Caldas Soares Ferreira Leandro Maciel da Silva Carlos Torturella Valadão Flávio Barcelos Braz da Silva Postgraduate Program in Control and Automation Engineering Serra Brazil

This paper presents the development of a computational methodology to determine input characteristics correlated with solar power generation. Solar power can be influenced by several factors, such as dirt accumulation on the panels, temperature, irradiation, and location, which may reduce the energy generation capability. Our objective is to quantify losses in photovoltaic power generation due to dirt on the panels using a computational method that analyzes the most correlated input features with solar power generation. Data was collected from a meteorological station and a photovoltaic system located at the Federal Institute of Espirito Santo, Serra campus, Brazil, to develop a dataset. This dataset was then utilized by the computational method to ascertain the most correlated features. Consequently, we were able to evaluate the impact of dirt both when the panels were dirty and after cleaning them. We analyzed the effect of six years of dirt accumulation before cleaning the panels. Following the feature correlation analyses, we opted to use the average solar radiation and temperature readings from the LPNET14 sensor, infrared radiation, and relative humidity to study the dirt's impact. As a result, we determined that cleaning the panels led to a 4.01% increase in the system's power output.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Implementation of a convolutional network for detection of PPE in automotive repair services

Implementation of a convolutional network for detection of P...

引用

IEEE Symposium on Computers & Informatics (ISCI)

作者： Álvaro Severo Marcus Luiz Alberto Pinto Gustavo Maia de Almeida Amanda Santos Silva Control and Automation Engineering Instituto Federal do Espírito Santo Brasil

ISBN: (数字)9798350353853

ISBN: (纸本)9798350353860

This study presents a novel application of computer vision technology to enhance safety in the automotive service industry, with a specific focus on the real-time detection of Personal Protective Equipment (PPE) usage. Using a YOLOv8 convolutional neural network, this study analyzes approximately 2,000 high-resolution images from security cameras within automotive repair facilities to detect compliance with safety gear requirements. These environments are characterized by constant artificial lighting and frequent interactions among employees and customers, which introduces complexity in visual data processing. The YOLOv8 model was selected for its proficiency in real-time object detection, facilitating robust and efficient analysis while ensuring that only authorized personnel perform specific tasks. Initial results indicate successful uniform detection, though challenges remain in accurately identifying smaller items like safety glasses and gloves. This underscores the potential of advanced image recognition technologies to substantially enhance workplace safety and operational efficiency across various industries. This study not only demonstrates the system's effectiveness in PPE detection but also sets a foundation for future advancements in smart safety practices within the industrial sector.

关键词： Personal protective equipment Industries Computer vision Image recognition Employment Maintenance engineering Real-time systems

来源：评论

学校读者我要写书评

暂无评论

Sensitivity Analysis of Thermal Runaway Side Reaction of Lithium Batteries Based on Morris Method 9

Sensitivity Analysis of Thermal Runaway Side Reaction of Lit...

引用

9th International Symposium on System Security, Safety, and Reliability, ISSSR 2023

作者： Man, Zhiyi Wang, Shaoping Zhang, Chao Zhu, Yun Beihang University School of Automation Science and Electrical Engineering Beijing100191 China AECC Aero-Engine Control System Institute Jiangsu Wuxi214100 China

ISBN: (纸本)9798350302479

In the field of electric vehicles, the safety of power lithium-ion batteries is a socially important issue, and the study of thermal runaway of lithium batteries is now gradually becoming more in-depth. In this paper, the output parameters are up-dimensioned. Using a global sensitivity analysis method based on the Moms screening method, the influence of 11 parameters such as volume of the cell(vBt), mass of the cell(mBt) and electrolyte concentration (W_e) on the thermal runaway process of Li-ion batteries is analyzed, and the variation of 10 variables such as temperature(T) and carbon dioxide gas (CO2) produced in the thermal runaway side reaction heat generation process and chemical reaction gas generation process over time is investigated under the influence of the parameter factors. In the study, the sensitivity of the parameters over a time interval is investigated in the rising dimension of the time domain. The results show that the overall effect of the parameters on the thermal process;for the output variables of the thermal process, they are mainly affected by the mass of the cell (m_Bt), the thickness of the SEI film (t_sei) and the specific heat capacity of the cell(Cp_Bt), while the chemical process is not significantly affected by the different parameters;among all the parameters, the volume (V_Bt) of the cell interacts most strongly with the other parameters for all the output variables. Finally, the results of the sensitivity analysis of the thermal runaway side reactions of the battery will be applied to the subsequent 3D simulation study. © 2023 IEEE.

关键词： Lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Distributed Optimization of Heterogeneous Linear Multi-Agent Systems with Unknown Disturbances 63

Distributed Optimization of Heterogeneous Linear Multi-Agent...

引用

63rd IEEE Conference on Decision and control, CDC 2024

作者： Duan, Mengmeng Zhu, Shanying Yang, Ziwen Chen, Cailian Guan, Xinping The authors are with the Department of Automation Shanghai Jiao Tong University Shanghai 200240 ChinaKey Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China and also Shanghai Engineering Research Center of Intelligent Control and Management Shanghai 200240 China

ISBN: (纸本)9798350316339

In this paper, we investigate the distributed optimization problem for heterogeneous linear multi-agent systems with unknown disturbances. By applying the primal-dual method and the time-scale separation technique, a distributed dynamic controller without using any disturbance information is proposed. Based on the optimal condition, the relationship between the optimal solution and the equilibrium point of the system is established, and it is shown that the distributed optimization problem is solved provided that the closed-loop system is stable. Then, inspired by the nonsingular perturbation analysis, it is proved that the closed-loop system is exponentially input-to-state stable with respect to the derivative of the disturbance. Numerical examples are provided to illustrate the theoretical results. © 2024 IEEE.

关键词： Closed loop systems

来源：评论

学校读者我要写书评

暂无评论

Tunable topological interface states via a parametric system in composite lattices with/without symmetric elements

引用

Applied Mathematics and Mechanics(English Edition) 2024年第12期45卷 2055-2074页

作者： Jianguo CUI Tianzhi YANG Wenju HAN Liang LI Muqing NIU Liqun CHEN School of Mechanics and Photoelectric Physics Anhui University of Science and TechnologyHuainan 232001Anhui ProvinceChina School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China School of Aerospace Engineering North University of ChinaTaiyuan 030051China School of Science Harbin Institute of TechnologyShenzhenShenzhen 518055Guangdong ProvinceChina Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

Over the past decades, topological interface states have attracted significant attention in classical wave systems. Generally, research on the topological interface states of elastic waves is conducted in the lattices with symmetric elements. This paper proposes composite lattices with/without symmetric elements, and demonstrates the realization of tunable topological interface states of elastic waves via parametric *** quantize the topological characteristics of the bands, a modified Zak phase is defined to calculate the topological invariant by the eigenstates for the lattices with/without symmetric elements. The numerical results show that the tunable frequencies of topological interface states can be realized in composite lattices with/without symmetric elements through the modulation of the parametric excitation frequency. The tunable topological interface states can be introduced into the vibration energy harvesting to design efficient and steady energy harvesting systems.

关键词： metamaterial topological interface state parametric excitation asymmetric element modified Zak phase

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：