检索结果-内蒙古大学图书馆

7th International Symposium on Autonomous Systems, ISAS 2024

作者： Wang, Bingxue Sun, Guodong Li, Bingjing Liaoning Petrochemical University College of Information and Control Engineering Fushun China Institute of Intelligence Science and Engineering Shenzhen China China Mining Products Safety Approval and Certification Center Beijing China

ISBN: (纸本)9798350363173

To effectively tackle the issue of high-frequency torque ripple in five-phase motors, this paper presents a novel method for suppressing high-frequency torque ripple through sensorless control in five-phase permanent magnet synchronous motors. This innovative approach is specifically designed to address the problem of high-frequency torque ripple and ensure its suppression in the motor. Compared with traditional methods, this strategy chooses to inject two high-frequency voltage signals with the same frequency but different amplitudes simultaneously on the d-axis and q-axis. Through this scheme, the optimal ratio of these two voltage amplitudes is determined to ensure that the electromagnetic torque remains stable during the signal injection process. Through this method, a constant d-axis and q-axis currents can be achieved, thereby minimizing high-frequency torque fluctuations. Through simulation verification, this strategy has shown significant effectiveness in solving the problem of high-frequency torque fluctuations in five phase motors. This optimized high-frequency signal injection method provides a new approach for optimizing the transmission performance of sensorless five phase motor, significantly reducing the vibration and noise generated by the driving system and improving overall operating efficiency. © 2024 IEEE.

关键词： Sensorless control

来源：评论

学校读者我要写书评

暂无评论

Deep Learning Method for Leakage Location Detection of Pneumatic Systems Based on Infrared Thermal Image Evaluation 24

Deep Learning Method for Leakage Location Detection of Pneum...

引用

7th International Conference on Software engineering and Information Management, ICSIM 2024

作者： Chang, Jiaqi Shi, Yan Yang, Liman Niu, Yanxia Nie, Yulong Yang, Zhiguo Li, Lei Zhang, Wenchao School of Automation Science and Electrical Engineering Beihang University China Engineering Training Center Beihang University China Guangzhou Industrial Control Environmental Protection Technology Co. Ltd China

ISBN: (纸本)9798400709197

Pneumatic systems are an essential fluid transmission method in the industrial field, which can achieve the transmission and control of power or signals. Leakage in pneumatic systems is challenging to detect and is a highly harmful fault. Most existing leak detection methods use flow or pressure sensors to detect specific leakage amounts, while leak localization is still in the traditional manual detection, which significantly restricts localization efficiency. This article establishes a deep learning framework-based thermal image localization method for pneumatic system leak detection. Infrared images captured in the pneumatic system were collected, and then a deep-learning localization method based on the YOLO framework was established. Then, the recognition accuracy of this method was calculated. The results indicate that the accuracy has reached 99.5% of mAP_0.5 and 86.27% of mAP_0.5:0.95, indicating that this work is a meaningful study that can apply intelligent computing to engineering. © 2024 ACM.

关键词： Object detection

来源：评论

学校读者我要写书评

暂无评论

Characterization of On-Orbit Temperature and Pressure Performance for Hydrazine Propulsion System 8th

Characterization of On-Orbit Temperature and Pressure Perfor...

引用

8th International Conference on Signal and Information Processing, Network and Computers, ICSINC 2021

作者： Gao, Yong Wang, Yuan Yao, Ning Ji, Jialong Yang, Jiaai Beijing Institute of Control Engineering Beijing100190 China Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology Beijing100190 China

ISBN: (纸本)9789811933868

To characterize on-orbit temperature and pressure variation of the hydrazine propulsion system, three types of temperature telemetries including the catalyst bed temperature/tank temperature/pipe temperature, and two types of pressure telemetries including tank pressure/pipe pressure were investigated. Results indicate that the catalyst bed temperature of the 5N hydrazine thrusters decline in the first few minutes before going up during the preheating process, and the turning point is related to the separation of the rocket fairing. The decline of the catalyst bed temperature is owing to the heat convection between the thruster and air in the fairing. The pressure fluctuation during thruster firing is in the range of ±0.25 MPa, but pipe pressure rises up apparently with a speed of 0.5 MPa/°C even the pipe temperature rises slightly in the locked pipe. Accordingly, monitoring measures of the temperature and pressure variation should be taken during on-orbit management of the satellite. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hydrazine

来源：评论

学校读者我要写书评

暂无评论

AF-YOLO:A Road Scene Object Detection Algorithm Fused with Mixed-domain Attention

Journal of Network Intelligence

引用

Journal of Network Intelligence 2023年第2期8卷 347-363页

作者： Liao, Lyuchao Chen, Ruixiang Shi, Jinjin Zheng, Qi Xiong, Rong Zeng, Jiemao Fujian Provincial Universities Key Laboratory of Industrial Control and Data Analysis Fujian Provincial Universities Engineering Research Center for Intelligent Driving Technology Fujian University of Technology Fuzhou350118 China Fujian Provincial Universities Engineering Research Center for Intelligent Driving Technology Fujian University of Technology Fuzhou350118 China

Object identification is a significant computer vision issue with a growing number of applications in the area of autonomous driving. In order to solve the problem of difficult detection of small objects and dense objects in the target detection algorithm in the autonomous driving scenarios,we propose an object detection method with a hybrid domain attention mechanism. In the model, the Neck network is integrated with a parallel mixed-domain attention mechanism to increase the usable features in the feature map from both channel and spatial aspects. Then, we improve the Spatial Pyramid Pooling (SPP) module with dilated convolutions to limit the loss of important information in the feature map after max pooling, which further optimizes the detector performance. Finally, a fusion approach is proposed to improve the detection layer and enhance the capability of detecting tiny objects. Extensive experiments on the BDD100k dataset show that the proposed model outperforms the state-of-the-art YOLOv5s model with an average accuracy increase of 6.22%(mAP @0.5). © 2023, Taiwan Ubiquitous Information CO LTD. All rights reserved.

关键词： Convolution

来源：评论

学校读者我要写书评

暂无评论

Fusion Visual Saliency with Dual-Spectral Saliency of Anomaly Detection for Hyperspectral Herbal Oral Liquid 9

Fusion Visual Saliency with Dual-Spectral Saliency of Anomal...

引用

9th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Yin, Ating Mao, Jianxu Wang, Yaonan Zeng, Kai Zhang, Hui Li, Yaping College of Electrical and Information Engineering Hunan University Changsha China National Engineering Research Center of Robot Vision Perception and Control Technology Changsha China

ISBN: (纸本)9781510664432

Chinese herbal oral liquid can leach a variety of effective ingredients from herbs and has become a major drug for clinical application. However, it is easy to produce or introduce foreign matters that are very faint in the automatic filling production process. To solve the challenge of low accuracy of faint foreign matter detection, in this paper, we proposed a salient-based anomaly detection method which is fuses visual saliency with dual-spectral saliency (VDS) for the hyperspectral herbal oral liquid. Specifically, we first select the most discriminative bands via the band selection method to generate the pseudo-color map. Subsequently, the histogram-based contrast method is introduced to select the saliency feature map with the largest variance of color features, while fusing the multi-scale gradient features to obtain the preliminary vision-based anomaly detection map. After that, the spectral angles and spectral Euclidean distances are calculated separately based on the oral liquid hyperspectral images to fused into dual-spectral saliency maps. Finally, the dual-spectral saliency map is employed to suppress the background information of the preliminary anomaly detection map. The experimental results show that our proposed method outperforms the state-of-the-art anomaly detection methods, which accurately and quickly achieve the detection of faint foreign matter in the hyperspectral herbal oral liquid. It will accelerate the process of automated filling production lines for oral liquid in the pharmaceutical industry. © 2023 SPIE.

关键词： Anomaly detection

来源：评论

学校读者我要写书评

暂无评论

Double-layer Descriptors and High-dimensional Search Mechanisms for Partial Point Cloud Registration

Double-layer Descriptors and High-dimensional Search Mechani...

引用

2023 China Automation Congress, CAC 2023

作者： Wang, Zhiyu Fang, Qiu Wang, Yaonan Lu, Hong Ye, Jun National Engineering Research Center for Robot Visual Perception and Control Technology School of Electrical and Information Engineering Hunan University Hunan Changsha410082 China

ISBN: (纸本)9798350303759

Partial point cloud registration is an essential preprocessing technique to generate complete 3D shapes that aim to transform partial scans into a common coordinate system. Existing methods that utilize geometric alignment rarely combine local and global information, which results in many incorrect correspondences. In the paper, a two-layer descriptor and a high-dimension searching approach (DDHSM) are utilized to extract and select the correct correspondences. Firstly, in the first layer, the Fast Point Feature Histogram (FPFH) is used to describe the feature of every point with high-dimension information based on its robustness and fastness. Then a high-dimensional search is considered to extract the initial corresponding set. In the second layer, global information is introduced to find the correct correspondences. For each point pair in the initial corresponding set, the normal angles are compared for all remaining points that satisfy the distance requirement. Finally, the singular value decomposition (SVD) method is implemented to compute the rigid transformation based on the updated corresponding set. Experimental results and comparisons with state-of-the-art methods demonstrate the effectiveness and feasibility of our approach. © 2023 IEEE.

关键词： Graphic methods

来源：评论

学校读者我要写书评

暂无评论

MATS-DROP: A HIGHLY SENSITIVE HIGH-THROUGHPUT SINGLE-CELL WHOLE TRANSCRIPTOMIC SEQUENCING METHOD 26

MATS-DROP: A HIGHLY SENSITIVE HIGH-THROUGHPUT SINGLE-CELL WH...

引用

26th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2022

作者： Cao, Wenjian Pan, Yating Mu, Ying Zhu, Qiangyuan Research Center for Analytical Instrumentation College of Control Science and Engineering State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou China Research Center for Analytical Instrumentation College of Life Sciences State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou China

ISBN: (纸本)9781733419048

The unprecedented single-cell resolution provided by single-cell RNA sequencing (scRNA-seq) powered the progress of biomedical research, leading to revolutionary discoveries. However, current high-throughput scRNA-seq methods are limited by sensitivity and can only detect polyadenylated transcripts. Utilizing polymer-tethered degenerate primer and droplet-based microfluidics, we developed a high-throughput scRNA-seq method with high sensitivity and whole transcriptomic detection capability. © 2022 MicroTAS 2022 - 26th International Conference on Miniaturized Systems for Chemistry and Life sciences. All rights reserved.

关键词： Microfluidics

来源：评论

学校读者我要写书评

暂无评论

Stress-unloading and gas migration improvement mechanism in the soft and hard interbedded coal seam using directional hydraulic flushing technology

引用

International Journal of Mining science and Technology 2023年第9期33卷 1165-1179页

作者： Hao Zhang Yuanping Cheng Cunbao Deng Jingyu Jiang Lei Zhang Xiaoyu Yan Junwei Guo Suifang Wang College of Safety&Emergency Management Engineering Taiyuan University of TechnologyTaiyuan 030024China Datong Coal Mine Group Co. LtdDatong 037037China Key Laboratory of Coal Methane and Fire Control Ministry of EducationChina University of Mining and TechnologyXuzhou 221116China National Engineering Research Center for Coal and Gas Control China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

To enhance gas drainage in the soft and hard interbedded(SHI)coal seam,it’s necessary to unload the insitu stress and improve its gas migration *** this research,a directional hydraulic flushing(DHF)technology was carried *** stress-unloading and gas migration improvement mechanism was analyzed through numerical simulation,and systematic engineering tests were conducted to verify the gas drainage *** results show that the improvement of gas migration performance in the SHI coal seam is caused by a combined effect of seepage-improving and *** DHF,stress-unloading and plastic failure could be achieved both in the soft coal(SC)sublayer and in the hard coal(HC)***,the gas diffusion capacity improves significantly in the SC sublayer,while the gas seepage capacity improves notably in the HC ***,the stress-unloading and gas migration improvement effect improves with the flushing radius and the thickness of the SC ***,after adopting the DHF technology,the gas drainage effect improved *** borehole number dropped by 49%,the gas drainage ratio increased from 26.0%to 48.2%,and the average coal roadway excavation speed increased from 2.4 to 5.6 m/d.

关键词： Hydraulic flushing Stress-unloading Plastic failure Permeability-increasing Gas migration

来源：评论

学校读者我要写书评

暂无评论

MLD-MPC Approach for Three-Tank Hybrid Benchmark Problem

引用

Computers, Materials & Continua 2023年第5期75卷 3657-3675页

作者： Hanen Yaakoubi Hegazy Rezk Mujahed Al-Dhaifallah Joseph Haggège Research Laboratory in Automatic Control(LARA) National Engineering School of Tunis(ENIT)University of Tunis El ManarTunis1002Tunisia Department of Electrical Engineering College of Engineering in Wadi AlddawasirPrince Sattam bin Abdulaziz UniversityWadi Alddawasir11911Saudi Arabia Control and Instrumentation Engineering Department King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center(IRC)for Renewable Energy and Power Systems King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia

The present paper aims at validating a Model Predictive control(MPC),based on the Mixed Logical Dynamical(MLD)model,for Hybrid Dynamic Systems(HDSs)that explicitly involve continuous dynamics and discrete *** proposed benchmark system is a three-tank process,which is a typical case study of *** MLD-MPC controller is applied to the level control of the considered tank *** study is initially focused on the MLD approach that allows consideration of the interacting continuous dynamics with discrete events and includes the operating *** feature of MLD modeling is very advantageous when an MPC controller synthesis for the HDSs is *** the MLD model of the system is well-posed,then the MPC law synthesis can be developed based on the Mixed Integer Programming(MIP)optimization *** solving this MIP problem,a Branch and Bound(B&B)algorithm is proposed to determine the optimal control ***,a comparative study is carried out to illustrate the effectiveness of the proposed hybrid controller for the HDSs compared to the standard MPC *** results show that the MLD-MPC approach outperforms the standardMPCone that doesn’t consider the hybrid aspect of the *** paper also shows a behavioral test of the MLDMPC controller against disturbances deemed as liquid leaks from the *** results are very satisfactory and show that the tracking error is minimal less than 0.1%in nominal conditions and less than 0.6%in the presence of *** results confirm the success of the MLD-MPC approach for the control of the HDSs.

关键词： Hybrid dynamic system model predictive control mixed logical dynamical model mixed integer programming three-tank hybrid system

来源：评论

学校读者我要写书评

暂无评论

A corrosion-resistant and age-hardenable Mg-Al-Mn-Ca-Ce dilute alloy with fine-grained structure processed by controlled rolling

引用

Journal of Materials science & Technology 2023年第32期163卷 223-236页

作者： Jia-Sheng Li Mei-Xuan Li Zhen-Ming Hua Yuan-Ting Mo Kai Guan Min Zha Yipeng Gao Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130012China International Center of Future Science Jilin UniversityChangchun 130012China

Low strength and poor corrosion resistance are two long-standing bottlenecks with dilute Mg ***,we report that the corrosion resistance of Mg-0.6Al-0.5Mn-0.2Ca(wt.%)alloy sheet can be significantly improved by micro-alloying with 0.3 wt.%Ce,and the strength can be considerably augmented after aging *** optimization of strength,ductility,and corrosion resistance is difficult due to the inherent trade-off in Mg ***,our aged Mg-0.6Al-0.5Mn-0.2Ca-0.3Ce alloy features with yield strength(YS)of∼194 MPa,ultimate tensile strength(UTS)of∼265 MPa,elongation to failure(EF)of∼17.2%,and corrosion rate(CR)of 2.2 mm y^(−1),the combination of which exhibits competitive advantage over other comparative dilute Mg *** is found that Ce addition decreases the activity of cathodic phases,inhibits detrimental effects of Fe impurities,and forms a protective Ce-containing surface *** high strength stems from the precipitation of ordered Guinier-Preston(G.P.)zones dispersed in uniform fine grains with an average grain size of∼8.2μ*** atomic-scale *** result in a noticeable age hardening response but do not act as crack initiation and propagation site,so our alloy also performs satisfactory *** work sheds light on the design and fabrication of strong,ductile,and corrosion-resistant dilute magnesium alloys to be used in electronic products and automotive bodies.

关键词： Magnesium alloy Micro-alloying Aging G.P.zones Mechanical property Corrosion

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：