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Analysis of Hydrocarbon Mixture Performance of a Dual-Channel Swirl Engine

Journal of Thermal Science 2020年第6期29卷 1391-1397页

作者： YUAN Wenhua HUANG Qilin FU Jun LIAO Jingjing LI Yu HE Yong ZHANG Zengfeng MA Yi School of Mechanical and Energy Engineering Shaoyang UniversityShaoyang 422004China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang UniversityShaoyang 422000China

In order to understand and improve the oil and gas mixing performance of a dual-channel vortex chamber diesel engine,the BH175F dual-channel vortex chamber combustion system was used as the research foundation,and the oil-gas mixture process of the combustion system was numerically *** analyzing the cylinder temperature,cylinder pressure,mixing process and combustion process of the combustion system,the mixture performance of the combustion system was *** indicated that:The mixture of the compression Top Dead Center(TDC)started to enter the main combustion chamber through the start-up hole;when the piston reached 4°After Top Dead Center(ATDC),the mixture started to enter the main combustion chamber through the connecting channels A and B,and the high-concentration mixture entered the main combustion from the start-up hole;when the piston continued running down to 20°and 25°ATDC,it could be seen that the main combustion chamber mixture was already relatively uniform;besides,when the equivalence ratio was between 0.8 and 1,the air-ftiel mixture was unevenly distributed in the main combustion *** provides guidance for further improvement of the combustion system.

关键词： gas mixing performance dual-channel vortex chamber combustion system

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Numerical Simulation and Analysis of HLTZ60-LJ-233 Water Turbine Transformation

Numerical Simulation and Analysis of HLTZ60-LJ-233 Water Tur...

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Computational Modeling, Simulation and Data Analysis (CMSDA), International Conference on

作者： Meiping Zhang Shoujun Wang Xuejun Zhou Tianjin Key Laboratory of Advanced Electromechanical System Design and Intelligent Control Tianjin University of Technology Tianjin Tianjin Sino-German University of Applied Technology Tianjin

In order to study the internal flow state of the mixed-flow turbine, this paper takes the modified HLTZ60-LJ-233 model turbine as the research object, combines with the modeling software UG, uses the grid division software ICEM, and then imports the flow field analysis software Fluent, and the turbine full-flow flow field analysis based on the k- ω turbulence model.

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Research on the Path Planning of the Construction Robot Based on BIM

Research on the Path Planning of the Construction Robot Base...

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2021 IEEE International Conference on Electrical Engineering and Mechatronics Technology, ICEEMT 2021

作者： Zhu, Fenghao Liu, Zhenzhong Tianjin University of Technology Tianjin Key Laboratory For Advanced Mechatronic System Design Intelligent Contr. Natl. Demonstration Center For Experimental Mechanical and Electrical Engineering Education School of Mechanical Engineering China

ISBN: (纸本)9781665441285

Aiming at the problem of the optimal global path planning of the construction robot entering the target point of the construction site and the efficient construction of the navigation map, a BIM(Building information modeling)-based construction robot job planning method is proposed. The traditional method of building a map environment for construction robots is obtained by its own sensors, which has a large amount of calculation. Firstly, the real construction environment is established through the BIM model, which effectively improves the efficiency of generating navigation map. Secondly, adding goal-directed functions to the RRT algorithm, combined with the target bias expansion algorithm based on the idea of artificial potential fields to further accelerate the search efficiency. Finally, the pruning algorithm is used to reduce the redundant points, which shortens the running time of the algorithm and the simulation time of the robot. The improved RRT algorithm before and after was compared and simulated in the construction environment of BIM in V-rep. The experimental results demonstrate a reduction of more than 50% in the final path simulation time for the improved RRT algorithm. © 2021 IEEE.

关键词： Motion planning

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design and Practice of Blended Teaching Model of Engineering Professional Courses based on Outcome-based Education

Design and Practice of Blended Teaching Model of Engineering...

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Educational Technology (ICET), IEEE International Conference on

作者： Jinyou Xu Lei Zhang Chengjie Rui Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) Tianjin China

In the context of engineering education, to improve the practical engineering skills of engineering students, the teaching ideas and implementation methods of the curriculum are designed based on Outcome-based Education. A blended teaching approach was used to design the implementation process to achieve the curriculum objectives. In this paper, we explain the process of blended teaching from the two aspects of basic knowledge and competency training. Active learning of basic knowledge is implemented based on a three-step blended teaching model before, after, and during classes. It adopts the project-driven learning approach of the flipped classroom model and cultivates students' ability to solve complex engineering problems through collaborative group and intra-group mutual assessment. Based on the original objective assessment of the curriculum and under the current teaching model, we design a diversified evaluation approach to comprehensively assess the effectiveness of student competence achievement. Practice has shown that project-based inquiry-based teaching methods based on the flipped classroom model can promote learning outcomes for students and increase their interest in learning. It avoids the blind and aimless theoretical learning process of the student and improves the practical ability of the student. The methods and means of instruction of teachers have been further extended, and the ability of students to learn independently has been improved.

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Construction and Application of the Teaching Cloud Platform for Engineering Drawing Course

Construction and Application of the Teaching Cloud Platform ...

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International Conference on Educational and Information Technology (ICEIT)

作者： Yahong Xue Haozhi Mu Lijun Xue Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China

A cloud platform for engineering drawing course teaching was proposed based on cloud station. The cloud station can solve the common problems existed in engineering drawing course, such as the difficulty of teaching, the heavy work of tutorship, the poor teaching effect, the weak spatial imagination of students, as well as the current difficulty to develop the virtual model resource base and the interaction is not strong. The platform uses Solidworks software to build 3D model library, and combines with CADbro's powerful cloud service and 3D file viewing function to realize the interaction and sharing with cloud model by using web browser. At the same time, we choose bilibili, a popular cultural site for teenagers, to release the explanation videos of exercises, and make use of the convenient way to build the cloud station to integrate, release and manage the resources. The platform realizes self-study and self-test at anytime and anywhere on both PC and mobile devices, and fast jumps the corresponding explanation video and cloud virtual model according to the demand. The virtual model in the cloud can be rotated, cut, distance measured, exploded, parts hidden, moved, 2D viewed and so on by touch. The platform is innovative, extensible, interesting and practical, which can greatly enhance the students' enthusiasm for independent learning, and it can be used reference to the development of engineering drawing teaching resources.

关键词： Cloud computing Solid modeling Three-dimensional displays Engineering drawings Education Buildings Software

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Teaching Innovation and Practice of Mind Mapping Applied to Engineering Drawing Course

Teaching Innovation and Practice of Mind Mapping Applied to ...

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International Conference on Educational and Information Technology (ICEIT)

作者： Yahong Xue Haozhi Mu Lijun Xue Xiaofei Wang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China

Engineering drawing is a compulsory technical foundation course for mechanical majors. Its main task is to cultivate students' ability to draw and read engineering drawings. The content of this course is complicated and abstract and not easy to understand, which makes it difficult for students to learn. Mind mapping is a visual thinking tool to systematize and organize abstract and complicated knowledge. Taking the application of mind mapping to various teaching processes of engineering drawing course, such as the construction of framework, the sorting out of fragmented knowledge, the solution of drawing geometry and sectional view, and the group project for important and difficult content as examples, we illustrate the importance of mind map in cultivating students' knowledge generalization ability, independent learning ability, enhancing students' logical thinking, creative thinking, divergent thinking, and stimulating students' interest in learning.

关键词： Knowledge engineering Geometry Visualization Technological innovation Engineering drawings Education Task analysis

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design of Pelton Turbine Test Stand in Plateau Environment 4

Design of Pelton Turbine Test Stand in Plateau Environment

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4th IAHR Asian Working Group Symposium on Hydraulic Machinery and systems

作者： Cai, Jinhan Zhou, Xuejun Luo, Hongying Wang, Zhengwei 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 China College of Mechanical Engineering Tianjin Sino-German University of Applied Science No. 2 Yashen Road Tianjin China College of Hydraulic and Civil Engineering Tibet Agricultural and Animal Husbandry University China Department of Energy and Power Engineering Tsinghua University China

In recent years, with the continuous development of China's hydropower projects, Pelton turbines are gradually being valued, and the focus of development has shifted from plain areas to plateau areas. Environmental impacts such as high altitude, water temperature, and high sediment content in the plateau area have caused serious interference to equipment that originally worked in a stable environment, for example, the failure of the cooperation between the parts of the turbine and the mutual seizure, the increased wear of the nozzle needle, the decrease of the flow rate and the water outlet speed of the nozzle, and the decrease of the air pressure in the plateau environment lead to the change of the flow state of the nozzle. In view of the above problems, this paper puts forward the design scheme of impulse turbine test-bed, using the method of changing specific speed to determine the basic parameters of impulse turbine unit, so as to eliminate the influence of plateau environment on the normal operation of turbine, obtain the efficiency condition of model experiment under low ambient pressure, and improve the operation efficiency and reliability of turbine unit. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Nozzles

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Investigation of the Conjugate Heat Transfer and Flow Field for a Flat Plate with Combined Film and Impingement Cooling

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Journal of Thermal Science 2020年第4期29卷 955-971页

作者： FU Jinglun CAO Ying ZHANG Chao ZHU Junqiang Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin 300384China

Film cooling combined with internal impingement cooling is one of the most effective technologies to protect the gas turbine vanes and blades from the hot gas. In this study, conjugate heat transfer CFD study was undertaken for a flat plate with combined film cooling and impingement cooling. An experiment on conjugate heat transfer of a flat plate with combined film and impingement cooling was performed to validate the code. Then the effects of several parameters including Biot number, blowing ratio, film hole shape and impingement hole diameter on the overall cooling effectiveness were numerically studied. The results show that for a specific combined cooling scheme and a given blowing ratio, the coolant potential can be reasonably allocated to the internal and the external cooling to achieve the overall cooling effectiveness. As the blowing ratio increases, the overall cooling effectiveness trends to reach a maximum value. For different film hole geometrical, the maximum values of the overall cooling effectiveness at high blowing ratio approximate to the same value. At a given mass flow rate of coolant, the increase of the impingement hole diameter leads to the reduction of the overall cooling effectiveness.

关键词： conjugate heat transfer combined film and impingement cooling overall cooling effectiveness Biot number blowing ratio

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Pressure-assisted Silver Sintering Structure Optimization for Power Modules 5

Pressure-assisted Silver Sintering Structure Optimization fo...

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5th International Conference on Optoelectronic Science and Materials, ICOSM 2023

作者： Zhang, Hao Xing, Yulong Gao, Lilan Liu, Zheng Tan, Yansong Lu, Guoquan Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin300384 China National Demonstration Center or Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China Tianjin Yixunyuan New Material Technology Co. Ltd. Tianjin300380 China School of Chemical Engineering Tianjin University Tianjin300350 China School of Materials Science and Engineering Virginia Polytechnic Institute and State University BlacksburgVA24061 United States

ISBN: (纸本)9781510674547

As mobile technology evolves from 5G to 6G, the demand for third-generation semiconductors such as SiC with higher power and frequency capabilities is increasing. Silicon Carbide power modules generate significant heat during operation, requiring large-area nano-silver sintering technology to improve module performance and reliability. However, in large-area sintering processes, low exhaust efficiency of solder paste by-products and uneven sintering pressure of the nano-silver paste result in poor sintering quality of the silver layer. This study aims to improve the sintering quality of interconnected silver layers by optimizing the sintering pressure distribution and adding rubber spacers to the sintering structure. ABAQUS was used to quantitatively analyze the effects of pressure methods and gasket material, diameter, and thickness on the stress distribution in the silver layer. Finally, based on the simulation results, an optimized sintering structure was proposed to unify the pressure and reduce the stress concentration in the silver layer, and verified experimentally by sintering tests. Compared with the traditional sintering structure, the application of a 2 mm thick fluoro rubber gasket with the same surface area as the silver layer in the optimized structure reduced the porosity to 2.15% and achieved a more dense sintered silver layer. © 2024 SPIE.

关键词： Finite element method

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Robust Containment Control of Heterogeneous Uncertain Multi-Agent systems under Markovian Switching Topologies

Robust Containment Control of Heterogeneous Uncertain Multi-...

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Fully Actuated system Theory and Applications (CFASTA), Conference on

作者： Haihua Guo Cong Bi Xiang Xu Shenzhen Key Laboratory of Control Theory and Intelligent Systems Southern University of Science and Technology Shenzhen China Hong Kong Institute for Data Science City University of Hong Kong Hong Kong China College of Artificial Intelligence Nankai University Tianjin China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China

ISBN: (数字)9798350373691

ISBN: (纸本)9798350373707

This study addresses the robust output containment control problem of heterogeneous uncertain multi-agent systems under Markovian switching topologies. A novel distributed output feedback controller is proposed. Based on the internal model approach, the main result shows that the output of each follower agent converges to the convex hull formed by the outputs of the leader agents under the proposed distributed controller. An illustrative example is given to validate the effectiveness of the proposed controller.

关键词： Switches Control systems Formation control Topology Output feedback Multi-agent systems

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