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Exploring the Reform of Mechanical Drawing Teaching and Undergraduate Training Based on the “Integration of Competition-Oriented Education and Industry-University Collaboration”

Exploring the Reform of Mechanical Drawing Teaching and Unde...

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International Conference on Educational and Information Technology (ICEIT)

作者： Zhang Runfeng Ming Yankun Liu Zhenzhong Wu Jianguo Wang Xiaofei Sun Yanfang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin Hanhailanfan Marine Technology Co. Ltd. Tianjin China

ISBN: (数字)9798350372663

ISBN: (纸本)9798350372670

This study aims to explore the reform of mechanical drawing teaching and the undergraduate training model with the goal of cultivating high-quality mechanical engineering undergraduate students. Grounded in the concepts of “synergy between science and education” and “integration of competition-oriented education and industry-university collaboration,” this research places talent cultivation as the central focus, linking it with discipline construction and emphasizing scientific research. The study promotes the reform of a collaborative education mechanism known as “integration of competition-oriented education and industry-university collaboration,” effectively establishing a multi-level and multi-dimensional undergraduate training model for mechanical engineering students that incorporates the “dual mentor system” and integrates theory, practice, and application. To apply this model in teaching practice, this research has undertaken the reform of traditional engineering drawing education, specifically addressing the issue of the gap between theory and practice in conventional teaching approaches. The proposed training program not only facilitates the development of innovative mechanical engineering professionals but also offers insights for the reform of undergraduate teaching models in the context of constructing “new engineering disciplines”.

关键词： Training Couplings Technological innovation Engineering drawings Collaboration Mechanical engineering Machinery

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The Design and Research of Resistance Instrument in Ship Towing Test

The Design and Research of Resistance Instrument in Ship Tow...

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IEEE International Conference on mechatronics and Automation

作者： Nan Li Nan Liu Xueqi Zhang Chao Cui National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China Tianjin Baolai Precision Machinery Industry Group Co. Ltd Tianjin China

ISBN: (数字)9798350388077

ISBN: (纸本)9798350388084

Based on the requirements of ship resistance towing test, a strain gauge type of resistance instrument has been designed, which consisting of the frame, towing component, course component, measuring component, etc. The towing component is responsible for the towing movement of the ship model, and the course component is responsible for constructing different course angles in the test requirements. An automatic brake mechanism has been equipped in measuring component, which can ensure the stability and accuracy of the tension sensor in towing test. The strength limit on the key components of the resistance instrument has been calculated by finite element analysis software, the optimization has been used in vulnerable components, and the instrument strength and reliability has been insured in the test.

关键词： Resistance Instruments Force Strain measurement Stability analysis Finite element analysis Electrical resistance measurement

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Research on Computer Network Technology system Based on Artificial Intelligence Technology 7

Research on Computer Network Technology System Based on Arti...

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2020 7th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation, CDMMS 2020

作者： Yao, Jinling Liu, Jie College of Electronic Information and Engineering Tianjin Vocational Institute Tianjin300000 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China Tianjin300384 China

This article introduces computer network intrusion detection systems and their classification based on artificial intelligence technology, and points out the challenges that intrusion detection systems (IDS) are facing in wireless sensor computer networks. On this basis, a hierarchical multi-layer wireless sensor network intrusion detection system and technology based on artificial intelligence technology Agent is proposed, and its network structure, working principle and performance are analysed. © Published under licence by IOP Publishing Ltd.

关键词： Intrusion detection

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Analysis of Strengthening Mechanism and Thermal Stability of M23c6 and Laves Phase in a Ferrite Matrix

SSRN

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SSRN 2023年

作者： Jin, Tiejian Shen, Junjie Ruan, Taotao Zhang, Dechang Xu, Yu Ren, He Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

The strengthening of ferrite matrix steel depends on the strengthening mechanism and thermal stability of M23C6 and Laves phases. This study investigated M23C6(Fe,Cr)23C6 and Laves(Fe2Nb) phase-strengthened ferritic steels. The creep microstructure, the interface structure, and the nanoindentation creep behavior of the second phase were studied. Results showed that the dislocation density in (Fe,Cr)23C6 strengthened ferritic steel after creep is lower than Fe2Nb strengthened ferritic steel. The dislocations in the crept (Fe,Cr)23C6 strengthened ferritic steel are straight without accumulation, significantly bending. The dislocations bend and entangle, forming dislocation walls in the crept Fe2Nb-strengthened ferritic steel. The orientation relationships between (Fe,Cr)23C6/Fe2Nb and ferrite matrix are [001]α-Fe//[011](Fe,Cr)23C6, (020)α-Fe//(71[[EQUATION]])(***)23C6,[001]α-Fe//[5[[EQUATION]]]Fe2Nb,(01[[EQUATION]])α-Fe//(03[[EQUATION]])Fe2Nb. The atomic interface mismatch between M23C6/Fe2Nb and the ferrite matrix is 20% of the semi-coherent interface and 1.6% of the coherent interface. The thermal stability of Fe2Nb is better than (Fe,Cr)23C6. The creep stress exponents of (Fe,Cr)23C6 and Fe2Nb in the ferrite matrix are 4.4 and 12.2, respectively. The alloy’s creep deformation follows dislocation climbing over the second phase. Second-phase Fe2Nb strengthening played a more significant role than (Fe,Cr)23C6 in enhancing the ferrite matrix. The results provide a theoretical foundation for developing ferritic heat-resistant steel based on Laves (Fe2Nb) phase strengthening. © 2023, The Authors. All rights reserved.

关键词： Creep

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Newly Developed Universal Analytical Approach to Incomplete Spherical Conformal Contact Problems: Application to Spherical Plain Bearings with Self-Lubricating Fabric Liner

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SSRN 2024年

作者： Xue, Yahong Kang, Dongzhuang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China College of Mechanical Engineering Tianjin University of Technology Tianjin300384 China

To address the conformal contact problem in self-lubricating spherical plain bearings bonded with a self-lubricating layer, a universal analytical model for normal contact between friction-less spheres is established. The accuracy and generality of this new model are verified through numerous finite element analyses. Our model overcomes the limitations of elastic half-space and small deformation assumptions. It can accurately calculate the contact stress distribution of self-lubricating spherical bearings bonded with a self-lubricating layer. Based on the new model, the complex non-linear relationship between the variables is being investigated. The model can be extended and applied to the conformal contact problem of spherical contact surfaces in biomechanics and other fields. © 2024, The Authors. All rights reserved.

关键词： Analytical models

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Exploration and Practice of Hierarchical Graduation Project under the Background of Science Collaborative Education and Engineering Education Accreditation 21

Exploration and Practice of Hierarchical Graduation Project ...

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Proceedings of the 5th International Conference on Advances in Artificial Intelligence

作者： Lilan Gao Yansong Tan Yanfang Sun Linwei Lv Bin Li Qijun Gao Xiaofei Wang Yijiao Zhao School of Mechanical Engineering_Tianjin Key Laboratory for Advanced Mechatronic System Design and intelligent Control_National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China School of Mechanical Engineering_Tianjin Key Laboratory for Advanced Mechatronic System Design and intelligent Control Tianjin University of Technology China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China

ISBN: (纸本)9781450390699

Graduation project is an important integrated practice segment for undergraduate education, since the quality of undergraduate education can be directly evaluated by the quality of graduation project. Under the background of science collaborative education and engineering education accreditation, it is necessary to explore an intelligent and integrated graduation project system to train students by all sorts of engineering and research projects, thus improve students' practical ability and innovation ability. This paper first analyzed the problems of the graduation project in the major of process equipment and control engineering, then introduced a novel hierarchical graduation project system to adapt to the concept of science collaborative education and engineering education. By putting the novel graduation project system into effect, the quality of graduation project has significantly improved.

关键词： Science collaborative education Hierarchical graduation project Engineering education accreditation Education reform

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Simulation of crystal plasticity of P92 heat resistant steel considering martensitic lath structure

Simulation of crystal plasticity of P92 heat resistant steel...

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2021 International Conference on Materials Genetic Engineering and Information Science, MGEIS 2021

作者： Wang, Xinyu Shen, Junjie Guo, Xiangru Qiao, Jixin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

Based on the theory of crystal plasticity, coupled with dislocation and lath hardening models, this paper establishes a crystal plasticity finite element model describing the high temperature creep of P92 steel. Open source software was used to generate lath models with an average size of 350nm, 650nm and 950nm to explore the effect of lath coarsening on the high-temperature creep behavior of P92 steel. The results show that the roughening of the slats increases the rate of creep deformation, resulting in a decrease in the service life of the material. Observing the slat model, it can be seen that the roughening of the slats enlarges the numerical gradient of stress and strain, and aggravates the overall plastic strain of the model. The coarsening of the slats accelerates the movement of dislocations, causing the density of movable dislocations to increase, and at the same time the shear strain amplitude of the slip system increases, thereby reducing the hardening behavior of the material. © Journal of Physics: Conference Series 2021.

关键词： Coarsening

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Location IoU: A New Evaluation and Loss for Bounding Box Regression in Object Detection

Location IoU: A New Evaluation and Loss for Bounding Box Reg...

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International Joint Conference on Neural Networks (IJCNN)

作者： Lu Yang Kai Zhang Jiaqi Liu Chongke Bi Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China Autobrain (Tianjin) Technology LTD Tianjin China College of Intelligence and Computing Tianjin University Tianjin China

ISBN: (数字)9798350359312

ISBN: (纸本)9798350359329

In the field of object detection bounding box regression, IoU (Intersection over Union) is a commonly used evaluation metric for measuring the overlap between predicted and ground truth bounding boxes. One limitation of IoU, however, is that the gradient goes to zero when there is no intersection between bounding boxes. Recent evaluation metrics have been developed to overcome this problem by incorporating penalty terms and other techniques for improving IoU. Despite these advances, existing methods still suffer to some degree from the problems of small gradients and slow rate of convergence. In this paper, a new evaluation method named LIoU (Location IoU) is proposed to address these issues. It can maximize the shared area of the intersection when used as the loss function and incorporate a variable gradient parameter to fit to datasets of different sizes. The experimental results indicate that we achieve 0.27% and 3.48% accuracy improvements respectively in SSD and YOLOv5 network on the VOC dataset, and 2.23% in the YOLOv5 network on the COCO dataset. The results of this study highlight the effectiveness of LIoU in improving the performance of object detection models.

关键词： YOLO Measurement Location awareness Accuracy Shape Neural networks Benchmark testing

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Exploration and Practice of Hierarchical Graduation Project under the Background of Science Collaborative Education and Engineering Education Accreditation 5

Exploration and Practice of Hierarchical Graduation Project ...

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5th International Conference on Advances in Artificial Intelligence, ICAAI 2021

作者： Gao, Lilan Tan, Yansong Sun, Yanfang Lv, Linwei Li, Bin Gao, Qijun Wang, Xiaofei Zhao, Yijiao Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9781450390699

关键词： Accreditation

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Structural Optimization of a Magnetically Operated Actuator Mechanism for 10kV Circuit Breaker

Structural Optimization of a Magnetically Operated Actuator ...

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system Simulation Technology and its Application (CCSSTA), IEEE China Conference on

作者： Chao Liang He Tian Guanqiao Zhao Jiangping Li Ziliang Zhu Ruixuan Shen Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) Tianjin China Tianjin Sanyuan Power Equipment Manufacturing Co. Ltd Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

As the demand for reliable power supply in power systems grows, ensuring the performance of circuit breaker operating mechanisms is crucial. This performance is pivotal to the stability of the power grid, the speed of fault recovery, and the equipment’s lifespan. In this paper, we introduce a structural optimization plan for a new magnetic control operating mechanism designed for 10kV circuit breakers. Employing three-dimensional and mathematical modeling, complemented by finite element analysis with Maxwell software, we delved into an in-depth study of the mechanism’s structure, performance, and materials. We further conducted a parametric design and comparative analysis of key components. The simulation results, which exclude the spring load, demonstrate that the optimized circuit breaker can achieve a closing velocity of 3.07 m/s, an electromagnetic force peaking at 2.7 kN, and a closure time minimized to 8.5 ms. These enhancements notably improve the mechanism’s closing efficiency. Consequently, our research introduces a novel perspective to the field of reliability studies for magnetic control operating mechanisms.

关键词： Magnetic cores Circuit breakers Magnetic domains Power system stability Power system reliability Magnetic analysis Magnetosphere Integrated circuit reliability Magnetic circuits Optimization

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