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Chinese Automation Congress (CAC)

作者： Shuo Jia Wei Chen Wenchang Zhang Hang Wu Weixiao Li Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin China Academy of Military Sciences of Chinese PLA Institute of Medical Support Technology Tianjin China Information Management and Information System Nanjing University of Posts and Telecommunications Nanjing China

Parallel mobile robots have recently attracted wide attention due to their strong load capacity, high running stability and rapid response speed. This paper conducts the kinematics research based on a pair of novel mobile legs that consist of a dual Stewart parallel mechanism. Firstly, we describe its motion mechanism and analyze the DOF of the mechanism in detail. Secondly, the forward and inverse kinematic solutions of the mechanism are computed and analyzed, and then the workspace is obtained by Matlab simulation. Thirdly, according to the principle of kinematics, we carry out dynamic performance optimization research to analyze and compare various motion control rules. Finally, the human-computer interface is designed for ease of analysis and displaying the kinematic rules of robot motion.

关键词： Legged locomotion Robot kinematics Mobile robots Motion control Stability

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A method for optimization design of multiple degrees of freedom micro gyroscope 25

A method for optimization design of multiple degrees of free...

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25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018

作者： Hao, Shuying Song, Yuhao Zhang, Chenqing Feng, Jingjing Zhang, Qichang Tianjin University of Technology School of Mechanical Engineering Tianjin Key Laboratory of Advanced Electromechanical System Design and Intelligent Control National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin China Tianjin University School of Mechanical Engineering Tianjin Key Laboratory of Nonlinear Dynamics and Control Tianjin China

ISBN: (纸本)9781510868458

In order to obtain ideal bandwidth and high sensitivity of multiple degrees of freedom micro gyroscopes, a kind of optimization design method of combining dynamic characteristic extraction with orthogonal experiment is presented in this paper. Firstly, the effect of vibrator mass ratio, structural frequency ratio and damping ratio on dynamic characteristic that is bandwidth and sensitivity of micro gyroscopes was studied, and then the constraint conditions of optimization design was determined according to dynamic characteristic. And on this basis the orthogonal experiment was adopted to set the level range of each factors and optimize sensitivity and bandwidth of the micro gyroscopes by orthogonal table of five factors and four levels. After optimization, the sensitivity of the micro gyroscopes is only slightly increased, but the bandwidth which compares to result of second order sequence optimization is increased by 1590Hz. Therefore, the optimization design method can greatly improve the bandwidth of the micro gyroscopes and be applied to the optimization design of the multiple degrees of freedom micro gyroscopes with wide-bandwidth. © 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved.

关键词： Bandwidth

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The Biomechanical Response of Cervical Spine under Different Follower Loads

The Biomechanical Response of Cervical Spine under Different...

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IEEE International Conference on Mechatronics and Automation

作者： Cheng-Fei Du Xin-Yi Cai Meng-Si Sun 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 School of Mechanical Engineering Tianjin University of Technology Tianjin China

The follower load is a synergy of the mimicking the human muscle tissue. It can improve load-carrying capacity of the human cervical spine and play an important part in maintaining the stability of cervical spine. Currently, the studies of the influence of a follower load on biomechanics of cervical spine is still not perfect. Therefore, this paper used the finite element (FE) modeling method to investigate the biomechanical response of cervical spine under different follower loads. The range of motion (ROM) of and intradiscal pressure (IDP) in the cervical spine were important parameters reflecting the condition of the cervical spine. So a three-dimensional (3D) nonlinear finite element model of the cervical spine (C3-C7) was built and validated. Under different follower loads (0 N, 50 N, 100 N, 150 N), a moment of 1 Nm was applied in the three anatomical planes to study the the influence of the follower load on the range of motion and intradiscal pressure in cervical spine. The results indicated that follower load reduced the ROM of cervical spine in extension, and in other postures increased the ROM. The most significant effect of the follower load on cervical spine was in torsion (55%), lateral bending (50%) and flexion (17%). In all postures, the IDP of cervical spine increased with the follower load increased, at the same the IDP changed nonlinearly with the follower load increased.

关键词： Read only memory Finite element analysis Load modeling In vitro Solid modeling Bending Spine

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Biomechanical Comparison of Lateral Interbody Fusion with and without Fixation

Biomechanical Comparison of Lateral Interbody Fusion with an...

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IEEE International Conference on Mechatronics and Automation

作者： Cheng-Fei Du Meng-Si Sun Xin-Yi Cai Chen-Xi Yuchi 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 School of Mechanical Engineering Tianjin University of Technology Tianjin China

Objective: To compare biomechanical behaviors of lumbar lateral interbody fusion with and without posterior fixation. Methods: Three kinds of three-dimensional nonlinear finite element models of lumbar vertebrae (L3-S1) were developed: traditional lateral interbody fusion with bilateral pedicle 4 screws and 2 rods internal fixation; only lateral interbody fusion; intact model. The models were supported to a 500N follower load with a 7.5-N.m moment of flexion, extension,lateral bending,and rotation. The change of the range of motion (ROM) and intervertebral disc pressure (IDP) of the surgical segment and adjacent segments are compared. Results: Compared with the intact model, both surgical methods reduce the range of motion at the surgical segment in all motion modes, but have almost no effect on adjacent segments. The addition of fixation induce the further reduction of ROM in the surgical segment, and the ROM is almost 0° in all motion modes except for rotation. While for the model of only lateral interbody fusion, the ROM range from 0.4° to 2.2°. Moreover, the variation of the intervertebral disc pressure in surgery groups are extremely subtle in all the segments and all the postures. Conclusion: Compared to the only lateral interbody fusion,the traditional internal fixation with bilateral pedicle 4 screws and 2 rods for lateral interbody fusion showed more bimechanical stability of the surgical segment. The extra fixation for lumbar lateral interbody fusion is indispensable for surgeon.

关键词： Surgery Finite element analysis Read only memory Spine Motion segmentation Biological system modeling Fasteners

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Far-field three-dimensional deep-subwavelength focal spot with azimuthal polarization

arXiv

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arXiv 2019年

作者： Nie, Zhongquan Liu, Jiawei Liu, Xiaofei Yan, Weichao Zhang, Yanxiang Tian, Yanting Liu, Shaoding Jia, Baohua Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan030024 Department of Physics Harbin Institute of Technology Harbin150001 China Centre for Micro-Photonics Faculty of Science Engineering and Technology Swinburne University of Technology HawthornVIC3122 Australia

This work focuses on the generation of far-field super-resolved pure-azimuthal focal field based on the fast Fourier transform. A self-designed differential filter is first pioneered to robustly reconfigure a doughnut-shaped azimuthal focal field into a bright one with a sub-wavelength lateral scale (∼0.392λ), which offers a 27.3% reduction ratio relative to that of tightly focused azimuthal polarization modulated by a spiral phase plate. By further uniting the versatile differential filter with spatially shifted beam approach, in addition to allowing for an extremely sharper focal spot, whose size is in turn reduced to 0.228λ and 0.286λ in the transverse as well as axial directions, the parasitic sidelobes are also lowered to an inessential level (3/128). The relevant phase profiles are further exhibited to unravel the annihilation of field singularity and locally linear (i.e. azimuthal) polarization. Our scheme opens a promising route toward efficiently steer and tailor the redistribution of the focal field. Copyright © 2019, The Authors. All rights reserved.

关键词： Fast Fourier transforms

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An accurate stop control method of high-speed rolling machine for automobile production line using laser ranging and two positon close loop

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Journal of Physics: Conference Series 2021年第1期1798卷

作者： Zhifeng Qiao Weimin Ge Haikang Zhang Huiyong Wei Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) Automotive Engineering Corporation (AE) NO.591 Changjiang Road Nankai District Tianjin China

The high-speed rolling machine is a key equipment in the automatic production line of automobile body-in-white welding. This article focuses on analyzing a method for accurately stopping the high-speed rolling machine using laser distance measurement. Firstly, through the analysis of the movement process, the calculation method of the length of each period in the 7-stage S-type acceleration and deceleration in the movement of the high-speed rolling machine is given; secondly, the system control theory model of the measurement and control system is established to analyze the dual-position closed-loop strategy The method of realizing the accurate stopping of the high-speed rolling machine; finally, the accurate stopping control method of the high-speed rolling machine proposed in this paper was verified by building an experimental system and developing the corresponding control program.

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Simulation Study on the controllable Dielectrophoresis Parameters of Graphene

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Chinese Physics Letters 2017年第4期34卷 71-74页

作者： Jian-Long Ji Ya-Li Liu Yang Ge Sheng-Dong Xie Xi Zhang Sheng-Bo Sang Ao-Qun Jian Qian-Qian Duan Qiang Zhang Wen-Dong Zhang Key Lab of Advanced Transducers and Intelligent Control System(Ministry of Education) Taiyuan University of TechnologyTaiyuan 030024 Advanced Coal Mine Machinery and Equipment Collaborative Innovation Center of Shanxi Province Taiyuan University of TechnologyTaiyuan 030024

The method of using dielectrophoresis （DEP） to assemble graphene between micro-electrodes has been proven to be simple and efficient. We present an optimization method for the kinetic formula of graphene DEP, and discuss the simulation of the graphene assembly process based on the finite element method. The simulated results illustrate that the accelerated motion of graphene is in agreement with the distribution of the electric field squared gradient. We also conduct research on the controllable parameters of the DEP assembly such as the alternating current （AC） frequency, the shape of micro-electrodes, and the ratio of the gap between electrodes to the characteristic/geometric length of graphene （λ）. The simulations based on the Clausius-Mossotti factor reveal that both graphene velocity and direction are influenced by the AC frequency. When graphene is close to the electrodes, the shape of micro-electrodes will exert great influence on the velocity of graphene. Also, λ has a great influence on the velocity of graphene. Generally, the velocity of graphene would be greater when λ is in the range of 0.4 0.6. The study is of a theoretical guiding significance in improving the precision and efficiency of the graphene DEP assembly.

关键词： DEP Simulation Study on the controllable Dielectrophoresis Parameters of Graphene

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Application of PID control based on BP neural network in the expansion machine of organic Rankine cycle system

Application of PID control based on BP neural network in the...

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Geothermal Resources Council 2018 Annual Meeting: Geothermal's Role in Today's Energy Market, GRC 2018

作者： He, Ruijie Wang, Zhigang Fu, Wencheng Tianjin Key Laboratory Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering United States National Demonstration Center Experimental Mechanical and Electrical Engineering Education United States Tianjin University of Technology China

ISBN: (纸本)0934412235

With the rapid development of China's economy, the relative shortage of energy has become one of the important factors restricting economic and social development. At present, the research and development of energy-saving technology in industrial process have important practical significance. The Organic Rankine Cycle (ORC) system is considered to be a technology for the efficient use of low-temperature heat energy, and many researchers have made efforts on the efficiency of ORC system. In this paper, the dynamic performance of the system is adjusted by using the neural network-based PID control method for the expander in the system. Firstly, the control model of the expander in the system is established, and then the control algorithm is applied to the controlled object to make the system run efficiently. The simulation results show that the algorithm has a good control effect compared with the traditional PID control. This control method can effectively improve the efficiency of ORC system. © 2018 International Journal of Caring Sciences. All rights reserved.

关键词： Rankine cycle

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Core-shell [email protected] 2 O-graphene-polydopamine interdigitated microelectrode array sensor for in situ determination of salicylic acid in cucumber leaves

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Sensors and Actuators B: Chemical 2021年 341卷

作者： Dandan Liu Mingji Li Hongji Li Cuiping Li Guilian Wang Penghai Li Baohe Yang Tianjin Key Laboratory of Film Electronic and Communication Devices Engineering Research Center of Optoelectronic Devices & Communication Technology (Ministry of Education) School of Electrical and Electronic Engineering Tianjin University of Technology Tianjin 300384 PR China Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Drug Targeting and Bioimaging School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 PR China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin 300384 PR China

The in situ detection of active small molecules in plants is one of the key technologies for the development of precision agriculture. An interdigitated microelectrode (IDME) array electrochemical sensor is constructed herein, with three groups of IDME arrays as a three-electrode system. The core-shell [email protected] 2 O-graphene (Gr)-polydopamine (PDA) nanoparticles are densely packed on Al microelectrodes using a three-potential step pulse electrodeposition method. Each of the over 2000 individual microelectrodes is approximately 1 μm wide and 1100 μm in length. The sensor has a high response to salicylic acid (SA) due to the synergistic electrocatalysis of [email protected] 2 O, Gr, and PDA, and the high-density arrangement of the three-electrode unit with microelectrodes. The sensor has a linear concentration range of 0.01–100 μM for SA and the detection limit is as low as 1.16 nM. The SA concentration in cucumber leaves is monitored from the early growth stage to the fruiting stage using the IDME array sensor, and the juice and living stems of the cucumber are detected. The flat structure of the [email protected] 2 O-Gr-PDA IDME array sensor is suitable for attachment onto plant tissues, especially for the in situ detection of SA in leaves.

关键词： Core-shell [email protected] 2 O-graphene-polydopamine Interdigitated microelectrode array Sensor Salicylic acid Plant

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Research on Computer Network Technology system Based on Artificial Intelligence Technology

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Journal of Physics: Conference Series 2021年第4期1802卷

作者： Jinling Yao Jie Liu College of Electronic Information and Engineering Tianjin Vocational institute Tianjin 300000 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education (Tianjin University of Technology) Tianjin 300384 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.

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