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8th International Conference on Distance Education and Learning, ICDEL 2023

作者： Hu, Wenhua He, Yuncheng Li, Jing Chen, Wei Wu, Ruiqin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China Research Center for Wind Engineering and Engineering Vibration Guangzhou University China Smart City College Beijing Union University China

ISBN: (纸本)9798400700422

Remote online experimental system is the inevitable trend of experimental teaching in the future. Compared with the traditional offline experimental mode, the online experimental system has better operability and more intuitive teaching significance. It can carry out experiments anytime and anywhere without many actual environmental restrictions, saving the time of teachers and students. The number of students in an online class is far more than the number of offline experiments, which can improve teachers' teaching efficiency and teaching quality. This paper will start from an experimental example, design the simulation system based on Automation Studio (AS) and build the actual system based on WS290 hydraulic experimental rig, and then design the image recognition remote control program, and let users achieve the purpose of experimental teaching and control through the program. © 2023 ACM.

关键词： Remote control

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Vibration absorption of parallel-coupled nonlinear energy sink under shock and harmonic excitations

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Applied Mathematics and Mechanics(English Edition) 2021年第8期42卷 1135-1154页

作者： Jian’en CHEN Wei ZHANG Jun LIU Wenhua HU Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures College of Mechanical EngineeringBeijing University of TechnologyBeijing 100124China

Nonlinear energy sink(NES)can passively absorb broadband energy from primary *** multiple NESs connected in parallel exhibit superior performance to single-degree-of-freedom(SDOF)*** this work,a linear coupling spring is installed between two parallel NESs so as to expand the application scope of such vibration *** vibration absorption of the parallel and parallel-coupled NESs and the system response induced by the coupling spring are *** results show that the responses of the system exhibit a significant difference when the heavier cubic oscillators in the NESs have lower stiffness and the lighter cubic oscillators have higher ***,the efficiency of the parallel-coupled NES is higher for medium shocks but lower for small and large shocks than that of the parallel *** parallel-coupled NES also shows superior performance for medium harmonic excitations until higher response branches are *** performance of the parallel-coupled NES and the SDOF NES is *** is found that,regardless of the chosen SDOF NES parameters,the performance of the parallel-coupled NES is similar or superior to that of the SDOF NES in the entire force range.

关键词： coupling influence nonlinear energy sink(NES) vibration absorption

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A clock synchronization method for EtherCAT master

A clock synchronization method for EtherCAT master

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2023智能制造与机械动力学学术大会

作者： Libo Cao Taiyong Wang Yongbin Zhang Songhui Jia Chong Tian Ying Tian Qingjian Liu School of Mechanical Engineering Tianjin University Renai College Tianjin University Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of Technology

EtherCAT has been widely applied in the motion control domain due to its advantages of the fast response speed,low CPU usage and good synchronization *** the distributed clock synchronization mechanism shows strong performance between the slaves,the clock synchronization method between the master clock and the reference clock is still open for users to choose,and there are few studies in this *** paper proposed a novel clock synchronization mechanism between the master of CNC system and the reference slave which also call servo motor of drive *** mechanism relies on sync0 of the reference servo ***0 is very stable and almost no time jitter,which is a dozen *** clock of the master of the numerical control system(CNC) adjusted the trigger moment of the interpolation period adaptively and dynamically to realize synchronization between master and reference servo motor taking sync0 as *** addition,the proposed method almost hardly add computational load and modify the EtherCAT frames by adding four bytes only without increasing an excessive communication load in the interpolation *** synchronization mechanism fills the gap of distributed clock synchronization which is the synchronization mechanism between reference servo motor and the other servo *** are preformed to verify the synchronization *** results demonstrate that the jitters of EtherCAT frames are measured to be only 112ns and 95.5 ns.

关键词： the CNC system synchronization reference slave sync0

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Research on vision detection technology based on photometric calibration

Research on vision detection technology based on photometric...

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2021 IEEE International Conference on Computer Science, Electronic Information Engineering and intelligent control Technology, CEI 2021

作者： Sun, Guoqing Zhou, Haibo Li, Chenming Zhao, Yijiao Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin300384 China

ISBN: (纸本)9780738146492

The camera is affected by illumination changes and vignetting effect during the shooting process, resulting in the lack of brightness information, which affects the accuracy of target detection. In order to reduce the impact of illumination changes and vignetting effect on image quality, obtain images closer to the real scene, and improve the accuracy of target detection, this paper conducts photometric calibration on the image from two aspects: the calibration of CRF (Camera Response Function) and the compensation function of vignetting effect. This paper first uses the N-degree polynomial model to construct the camera response function, proposes a functional model of vignetting compensation based on the position of the pixel point, and finally combines the first two experimental results and conducts experimental verification on the data set before and after the photometric calibration on different algorithms of target detection. The experimental results show that the application of photometric calibration in the field of machine vision can improve the adaptability of machine vision to illumination changes and vignetting effect to a certain extent. The self-made data set is trained and tested, when IoU is 0.7, the mAP calculated by the test set after photometric calibration is improved by 2.3% compared with the original data set. © 2021 IEEE.

关键词： Computer vision

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Research on intelligent Fault Diagnosis Method of Planetary Gearbox Based on ITD and CNN

Research on Intelligent Fault Diagnosis Method of Planetary ...

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Prognostics and system Health Management Conference (PHM-Qingdao)

作者： Songsong Zhu Jiwei Chen Ruitong Xie Yuhao Song Mian Zhang Mengxiong Zhao 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

ISBN: (数字)9798350354010

ISBN: (纸本)9798350354027

Accurate fault diagnosis of planetary gearboxes (PGs) is crucial for preventing equipment failures and extending their lifespan. To enhance the efficiency and accuracy of PG fault diagnosis, this paper proposes a novel method integrating intrinsic time scale decomposition (ITD) with convolutional neural network (CNN). The proposed method leverages the demodulation capability of ITD to decompose and reconstruct the original signal, effectively removing irrelevant noise and isolating core fault features, and the learning ability of CNN to accurately identify the fault features. Compared to methods relying on CNN only, the proposed method not only improves the computational efficiency but also achieves higher fault diagnosis accuracy.

关键词： Fault diagnosis Accuracy Computational modeling Noise Feature extraction Computational efficiency Convolutional neural networks Prognostics and health management Demodulation

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Kinematic analysis and trajectory planning of two-limb 4-DOF high-speed parallel robot

Kinematic analysis and trajectory planning of two-limb 4-DOF...

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IEEE International Conference on mechatronics and Automation

作者： Weihua Sun Yue Ma Changrui Li Bin Li Yansen Zhao Qi Liu 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

ISBN: (数字)9798350388077

ISBN: (纸本)9798350388084

Focusing on the pick-and-place operation in the electronic, packaging, and other light industries, this paper proposed a new type 3T1R (T-Translation, R-Rotation) high-speed parallel robot with two limbs. Compared with other 4-DOF high-speed parallel robots with four limbs, its structure is simpler while the working space is larger, such that the potential for cheaper usage in the industry is achieved. The robot's kinematic analysis and trajectory planning, including key aspects, are also outlined here. Firstly, the robot's closed-loop constraint equation is established using the vector chain method. The displacement, velocity, and acceleration models are derived, and the Jacobian matrix is obtained. On this basis, the gate shape trajectory is planned using the 3-4-5 polynomial motion rule, such that the displacement, velocity, and acceleration of the driving joint are obtained using the kinematic models above. Ultimately, the accuracy of the kinematic models is confirmed by comparing the theoretical outcomes with the simulations carried out in SolidWorks. The study presented in this paper establishes a firm basis for the dimensional integration and the creation of a physical model of the robot.

关键词： Industries Solid modeling Parallel robots Trajectory planning Kinematics Logic gates Vectors

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Kinematic modeling and simulation of a 5-DOF hybrid mechanism for active vibration isolation

Kinematic modeling and simulation of a 5-DOF hybrid mechanis...

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IEEE International Conference on mechatronics and Automation

作者： Xiaoqing Qiu Yue Ma Zijie Wang Bin Li Lin Pin Doudou Duan 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

ISBN: (数字)9798350388077

ISBN: (纸本)9798350388084

Vibration generated by road bumps can cause secondary injury to patients. The risk of secondary injury can be significantly reduced by attaching an active suspension system to isolation medical beds. In this paper, a five DOFs (degree of freedoms) hybrid mechanism is designed by combining a 3-P(UU) 2 mechanism and a 2-PUS mechanism through a universal joint, leading to 3T2R movement capabilities to reduce the vibration. The kinematic models are firstly established to evaluate the displacement, velocity and acceleration of the hybrid mechanism. On this basis, a typical trajectory is planned to simulate the movement capabilities of the mechanism by using the trapezoidal acceleration curve motion law. Finally, the effectiveness of the kinematic models is verified by compared the results with those simulated by SolidWorks. The research results of this paper provide a solid foundation to the dimensional synthesis of the hybrid mechanism.

关键词： Vibrations Performance evaluation Solid modeling Roads Kinematics Solids Vectors

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Mechanical design of Out-pipe Detection Mechanisms for Pipeline Defects

Mechanical Design of Out-pipe Detection Mechanisms for Pipel...

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IEEE International Conference on mechatronics and Automation

作者： Guangyin Nie Xinhua Zhao Yihan Ren Liang Liu 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

ISBN: (数字)9798350388077

ISBN: (纸本)9798350388084

Pipes in various are dominated in in the process of industrial production. To avoid the pipeline leak due to inner corrosion, it is essential to develop pipe inspection mechanisms to detect the wall thickness of the pipes used in production. The paper presents three kinds of out-pipe detection mechanisms (ODM) for different petrochemical pipeline detection demands based on eddy current testing (ECT) method. A linear inspection mechanism with fixed length is firstly proposed to detect defects of straight pipe. Secondly, a rotary inspection mechanism is designed for pipeline weld detection. Besides, an out-pipe scanning wheeled robotic mechanism is developed to detect wall thickness of pipes and avoid small obstacles such as valves on the pipelines. Lastly, detection experiments and simulations are carried out to verify the effectiveness of the designed out-pipe detection mechanisms.

关键词： mechatronics Welding Pipelines Production Inspection Valves Petrochemicals

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Research on solar-coupled ground-source variable frequency air conditioning system based on trnsys

Research on solar-coupled ground-source variable frequency a...

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Geothermal Resources Council Virtual Annual Meeting and Expo: Clean, Renewable and Always On, GRC 2020

作者： Deng, Yiming Wang, Zhigang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology

ISBN: (纸本)9781713822097

By building a model of an air conditioning system with a solar-coupled ground-source heat pump, the simulation shows that the pump has been running at its maximum load, especially in terms of energy consumption. In order to solve this problem, the variable frequency drive (VFD) pump is adopted. Only the variable frequency of the water pump at the load side and the water pump at the source side has been considered, and the flow rate of the pump is determined according to the load value. The solar side water pump does not adopt frequency conversion to operate at the maximum flow to ensure the maximum utilization of solar energy. When the load side water pump and the source side water pump adopt frequency conversion, this will not only cause a change in flow but also a change in the power consumption of the unit, which will further affect the unit's operating performance. On the other hand, based on the simulation results of the load, the cooling capacity is greater than the heating capacity, which will cause the soil temperature to rise, that is, the soil temperature will be out of balance. Therefore, it is necessary to add a cooling tower to dissipate the temperature of the buried pipe in summer. The total energy consumption of the system is 22,411,541 kW, which is 27% less than the conventional energy consumption. In summer, the COP of the unit is about 6.9, which is 42% higher than the conventional situation. And in winter, the COP is about 4.8, which is 27% higher than the conventional model. © 2020 Geothermal Resources Council. All rights reserved.

关键词： Energy utilization

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Review of Research Advances in CFD Techniques for the Simulation of Urban Wind Environments

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Fluid Dynamics & Materials Processing 2022年第2期18卷 449-462页

作者： Pengfei Ju Mingrui Li Jingying Wang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education(Tianjin University of Technology) Tianjin300384China School of Energy and Power Engineering Shandong UniversityJinan250061China Shandong Engineering Laboratory for High-Efficiency Energy Conservation and Energy Storage Technology&Equipment Shandong UniversityJinan250061China

Computational fluid dynamics(CFD)has become the main method for the prediction of the properties of the external wind environment in cities and other urban contexts.A review is presented of the existing literature in terms of boundary conditions,building models,computational domains,computational grids,and turbulence *** specific issues,such as the accuracy/computational cost ratio and the exploitation of existing empirical correlations,are also examined.

关键词： Computational fluid dynamics wind environment pre-processing settings

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