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17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： Liu, Shujian Zhou, Haibo Li, Chenming Wang, Shuo Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin300384 China

ISBN: (纸本)9781728164151

As one of the core mission of computer vision, object detection has been widely applied with the rapid development of computer technology, especially in the fields of face detection, behavior detection, auto driving, and intelligent monitoring. Aiming at the shortcomings of the traditional object detection, such as low detection accuracy, low efficiency and poor robustness, this article summarizes deep learning-based detectors of two kinds of modules: Anchor-Based and Anchor-Free. The performance of each detector is compared and analyzed in this paper as well. In addition, we summarize the development of object detection's key technologies from the aspect of improvement of Backbone, the optimization of NMS, imbalance of positive and negative samples' solution etc. Finally, the development trend of object detection is discussed from the prospect of lightweight detection model, weakly supervision detection and small object detection etc. © 2020 IEEE.

关键词： Object detection

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Design of a highly safe model vehicle for rear-end collision avoidance considering multiple faults of sensors

Design of a highly safe model vehicle for rear-end collision...

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CSSim 2009 - 1st International Conference on Computational Intelligence, Modelling, and Simulation

作者： Kasuga, Takeshi Yakubo, Satoshi Department of Electrical Engineering Fukushima National College of Technology Iwaki 970-8034 Japan Advanced Course in Mechanical and Electrical System Engineering Fukushima National College of Technology Iwaki 970-8034 Japan

ISBN: (纸本)9780769537955

This paper presents design of a highly safe driving control system using different kinds of sensors and its evaluation in order to avoid the rear-end collision of the model vehicle. An appropriate combination of different kinds of sensors is introduced to reduce the occurrence of multiple faults. It is shown in the computer solution that the reliability of the combination of different kinds of sensors is higher than that of the combination of the same kind of sensors. Moreover, the systematic design of the model vehicle is proposed, and it is also shown in the experiment that the rear-end collision avoidance can be achieved even if a fault occurs at any sensor. © 2009 IEEE.

关键词： Vehicles

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Augmented Reality and Quick Response Code Technology in engineering Drawing course 17

Augmented Reality and Quick Response Code Technology in Engi...

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17th IEEE International Conference on Mechatronics and Automation, ICMA 2020

作者： Wang, Xiaofei Chen, Chenfei Li, Zhaotong Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin300384 China

ISBN: (纸本)9781728164151

Augmented reality (AR) technology is a cutting technology. It can enhance the perception of reality and provide more information of the real world. AR technology is used in many fields, like medical, industry, and education. In this paper, AR is introduced into engineering drawing course. engineering drawing course is difficult to learn as it is a knowledge that students rarely contact with. To have a close contact with the models and the views, a convenient AR application (AR app) is proposed in the paper. With the help of the AR app, virtual models and real views are combined well. The models can be moved and rotated by touching the screen. Some videos of model assembly and disassembly can be obtained when scanning the quick response code (QR code). Thus, it is convenient for students to use mobile phone to study engineering drawing effectively. The interactive teaching environment enhances students' spatial thinking and cultivates their sense of innovation. © 2020 IEEE.

关键词： Augmented reality

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Highly safe driving control system for model vehicles using different kinds of sensors and one-way wheels

Highly safe driving control system for model vehicles using ...

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2009 9th International Symposium on Communications and Information Technology, ISCIT 2009

ISBN: (纸本)9781424445219

This paper presents a highly safe driving control technique using different kinds of sensors and one-way wheels to avoid the rear-end collision and sudden stop of the model vehicle. The basic concept is "sensor diversity" which enables fault tolerant operations. An appropriate combination of different kinds of sensors is introduced to reduce the occurrence of multiple faults. The systematic design of the model vehicle is presented, and the rear-end collision avoidance can be achieved even if a fault occurs at any sensor. Moreover, if the wheel races even if a fault occurs at any motor and then the rotation of the axle stops, a safe driving can be maintained. The important design concept is that a fault makes linearly additive effect with a small value to the final result. In order to meet the requirement, we introduce one-way wheels instead of usual wheels. It is shown in the experiment of driving control of the model vehicle that rear-end collision can be avoided and then safety operations can be achieved. ©2009 IEEE.

关键词： Signal processing

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An asymmetrically substituted dithieno[3,2-b:2',3'-d]pyrrole organic small-molecule hole-transporting material for high-performance perovskite solar cells

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Chinese Journal of Chemical engineering 2022年第5期35卷 51-57页

作者： Jingwen Jia Yue Zhang Liangsheng Duan Quanping Wu Yu Chen Song Xue Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Department of Applied ChemistryTianjin University of TechnologyTianjin 300384China

Hole-transporting materials play a vital role in terms of the performance of perovskite solar cells(PSCs).The dithieno[3,2-b:2’,3’-d]pyrrole(DTP),an S,N-heterocyclic building block,has been proved to be desirable for molecular design of hole-transporting materials in *** developed an asymmetrically substituted DTP small-molecule(JW12)and a reference compound(JW11).The asymmetrical structure of JW12 leads to different absorption properties and electron *** device in a planar n-i-p architecture using JW12 shows a much higher PCE(18.07%)than that based on JW11(15.46%),which is also better than the device based on spiro-OMe TAD(17.47%).We hope our research can provide a new perspective in molecular design of organic HTMs for perovskite solar cells.

关键词： Hole-transporting materials DTP Perovskite Photovoltaic performance

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Deformation in axial compression of aluminum tubular structures with ribs

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Keikinzoku/Journal of Japan Institute of Light Metals 2019年第8期69卷 379-386页

作者： Yokoya, Keisuke Miyazaki, Makoto Tojo, Yusuke Yamashita, Minoru Institute of Technology Nagano College Advanced Course of Production and Environment System National 716 Tokuma Nagano-shi Nagano381-8550 Japan Department of Mechanical Engineering Tokyo Institute of Technology [2-12-1 Ookayama School of Engineering Meguro-ku Tokyo152-8552 Japan Department of Mechanical Engineering National Institute of Technology Nagano Japan DENSO Aircool Corporation Japan Department of Mechanical Engineering Gifu University Japan

Dynamic compression behavior of various kinds of polygonal tubular structures with ribs are investigated. Square hollow structures and that with rib reinforcement of aluminum extrusions are in dynamic axial compression, using a drop hammer. Numerical simulation was also conducted for the wider variety of cross-sectional shapes and reinforcements. The effect of the axial length, cross-sectional shape and reinforcing rib arrangement on the deformation behavior were investigated. Comparable compressive force was obtained when the cross-sectional area of the structure is similar, even if the number of edges in cross-section increases from four (square) to eight. Rib reinforcement is very effective for the improvement of the crush or energy absorbing performance. Deformation behavior was successfully predicted by the numerical simulation. Numerical simulation of the compression of the various polygonal tubular structures with radial ribs was also carried out. The number of radial ribs in cross-section of the polygonal hollow structure has a positive relationship to the deformation constraint at corners and the torsional rigidity, consequently, the crush resistance increased. © 2019 The Japan Institute of Light Metals.

关键词： Reinforcement

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Optimization of experiment teaching in the course of mechanical principle 3

Optimization of experiment teaching in the course of mechani...

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3rd International Conference on Education Technology Management, ICETM 2020

作者： Hao, Pujun Liu, Jingna Ma, Wenpeng Wu, Ruiqin 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 Tianjin Key LABORATORY for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9781450388757

Based on experience of former teaching reformation and philosophy of "Emerging engineering Education", an experimental teaching reformation program that includes restructured knowledge system, modularization of experimental teaching process and diversified evaluation system is proposed. It is found that students have deeper and comprehensive understanding on knowledge and more enthusiasm in experimental process. Finally students have definite self-cognition about their division of labor in teamwork. Through gathering statistics, the effectiveness of reformation program is verified and this program can enrich practical experience of experimental teaching reformation. © 2020 ACM.

关键词： Optimization

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Simulation Study on the Influence of Drilling Parameters on the Temperature of Skull Drilling

Simulation Study on the Influence of Drilling Parameters on ...

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

作者： Jiang, Wenyu Liu, Zhenzhong Tianjin University of Technology National Demonstration Center For Experimental Mechanical and Electrical Engineering Education School of Mechanical Engineering Tianjin Key Laboratory For Advanced Mechatronic System Design and Intelligent Control Tianjin China

ISBN: (纸本)9781665441285

Skull drilling is an important and difficult process in neurosurgical craniotomy, which will inevitably produce a lot of heat. Correct understanding of the heat production law of skull drilling has important guiding significance for craniotomy robot. In this study, cortical bone and cancellous bone were layered to establish models according to the 3D reconstruction data of skull. The finite element method based on ABAQUS is used to establish the skull drilling model and realize the simulation of bone tissue surgical instrument interaction state for surgical robot. The results show that when the drill rotation speed and feed speed increase, the drilling temperature will also increase, but the drill rotation speed will have a more significant effect on bone drilling temperature, and when the drill rotation speed is low (300r/min, 600r/min), the drill bit diameter has little effect on the drilling temperature, but when the drill rotation speed is higher (900r/min, 1200r/min), the larger diameter drill bit(11mm) will produce more drilling heat. © 2021 IEEE.

关键词： Finite element method

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Design of wearable squat booster for automobile assembler based on ergonomics 6

Design of wearable squat booster for automobile assembler ba...

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2020 6th International Forum on engineering Materials and Manufacturing Technology, IFEMMT 2020

作者： Chen, Zhewen Qiao, Zhifeng Bao, Tianxu Dou, Fuchao Chen, Xinpu Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China

Aiming at the problem that automobile assembler need to squat for a long time, a wearable squatting assistance system with low cost, simple control and easy to squat and walk is designed. Based on ergonomics and finite element theory, UG was used to draw a three-dimensional solid model of the wearable squatting power system for automobile assemblers. With the help of ANSYS software, the statics analysis of key components is carried out to check their strength and stiffness. It is concluded that the wearable squatting power assist device for automotive fitters based on ergonomics has reached the design requirements in terms of function use and strength and stiffness. © Published under licence by IOP Publishing Ltd.

关键词： Ergonomics

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Mechanism Design and Motion Simulation of Mobile Robot with Compound Motion Mode

Mechanism Design and Motion Simulation of Mobile Robot with ...

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

作者： Shi, Yanan Yang, Yuwei Liu, Zhenzhong Zhang, Haiming Tianjin University of Technology National Demonstration Center For Experimental Mechanical and Electrical Engineering Education Tianjin Key Laboratory For Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin China

ISBN: (纸本)9781665441285

Aiming at the problem of poor trafficability and difficulty in dealing with complex environment of traditional mobile robot, we proposed a climbing and hopping hybrid mobile robot. In this paper, we took the spring four-bar linkage mechanism as the hopping mechanism and the C-shaped wheel foot mechanism as the walking mechanism. Completed the structure design of the robot. Realized the assembly and disassembly of the virtual prototype, and completed the motion simulation and analysis. The results show that the robot is stable in the aspects of structure design and its jumping height can reach 988mm, and has a great potential in reconnaissance, monitoring, survey etc. © 2021 IEEE.

关键词： Mobile robots

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