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13th IEEE Conference on Industrial Electronics and Applications, ICIEA 2018

作者： Shangbin, Jiao Dongbin, Hou Ding, Liu Weichao, Huang Natl. and Local Joint Engineering Research Center of Crystal Growth Equipment and System Integration Xi'an710048 China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xian710048 China

ISBN: (纸本)9781538637579

Based on the analysis of the Cusp magnetic field suppression convection principle, the simulation model of superconducting Cusp magnetic field is built by the finite element method. In the case of satisfying the magnetic field strength of the crucible wall and giving the excitation current, the number of layers of the superconducting coil is calculated by using the established model. The influence of coil spacing, thickness of shielding thickness, horizontal distance between coil and shielding thickness and longitudinal distance on magnetic induction strength, horizontal distance and longitudinal distance between coil and the shielding are analyzed under the condition that the number of superconducting coils is constant. The influence of the force on the coil, the influence of the thickness of the shielding body on the magnetic leakage strength of the magnetic field. The simulation results show that the optimized Cusp magnetic field structure parameters can be used in the actual design. © 2018 IEEE.

关键词： Finite element method

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intelligent Physical Attack Against Mobile Robots With Obstacle-Avoidance

arXiv

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arXiv 2019年

作者： Li, Yushan He, Jianping Chen, Cailian Guan, Xinping The Department of Automation Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Shanghai Engineering Research Center of Intelligent Control and Management Shanghai200240 China

The security issue of mobile robots has attracted considerable attention in recent years. In this paper, we propose an intelligent physical attack to trap mobile robots into a preset position by learning the obstacle-avoidance mechanism from external observation. The salient novelty of our work lies in revealing the possibility that physical-based attacks with intelligent and advanced design can present real threats, while without prior knowledge of the system dynamics or access to the internal system. This kind of attack cannot be handled by countermeasures in traditional cyberspace security. To practice, the cornerstone of the proposed attack is to actively explore the complex interaction characteristic of the victim robot with the environment, and learn the obstacle-avoidance knowledge exhibited in the limited observations of its behaviors. Then, we propose shortest-path and hands-off attack algorithms to find efficient attack paths from the tremendous motion space, achieving the driving-to-trap goal with low costs in terms of path length and activity period, respectively. The convergence of the algorithms is proved and the attack performance bounds are further derived. Extensive simulations and real-life experiments illustrate the effectiveness of the proposed attack, beckoning future investigation for the new physical threats and defense on robotic systems. Copyright © 2019, The Authors. All rights reserved.

关键词： Mobile robots

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Research on Computer Network Technology system Based on Artificial Intelligence Technology

引用

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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Biomechanical Comparison of Lateral Interbody Fusion with and without Fixation

Biomechanical Comparison of Lateral Interbody Fusion with an...

引用

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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The Biomechanical Response of Cervical Spine under Different Follower Loads

The Biomechanical Response of Cervical Spine under Different...

引用

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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0.75 Gbit/s high-speed classical key distribution with mode-shift keying chaos synchronization of Fabry-Perot lasers

arXiv

引用

arXiv 2020年

作者： Gao, Hua Wang, Anbang Wang, Longsheng Jia, Zhiwei Guo, Yuanyuan Gao, Zhensen Yan, Lianshan Qin, Yuwen Wang, Yuncai Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan China School of Information Engineering Guangdong University of Technology Guangzhou China Guangdong Provincial Key Laboratory of Photonics Information Technology Guangzhou China Center for Information Photonics and Communications School of Information Science and Technology Southwest Jiaotong University Chengdu China

High-speed physical key distribution is diligently pursued for secure communication. In this paper, we propose and experimentally demonstrate a scheme of high-speed key distribution using mode-shift keying chaos synchronization between two multi-longitudinal-mode Fabry–Perot lasers commonly driven by a super-luminescent diode. Legitimate users dynamically select one of the longitudinal modes according to private control codes to achieve mode-shift keying chaos synchronization. The two remote chaotic light waveforms are quantized to generate two raw random bit streams, and then those bits corresponding to chaos synchronization are sifted as shared keys by comparing the control codes. In this method, the transition time, i.e., the chaos synchronization recovery time is determined by the rising time of the control codes rather than the laser transition response time, so the key distribution rate is improved greatly. Our experiment achieved a 0.75-Gbit/s key distribution rate with a bit error rate of 3.8 × 10-3 over 160-km fiber transmission with dispersion compensation. The entropy rate of the laser chaos is evaluated as 16 Gbit/s, which determines the ultimate final key rate together with the key generation ratio. It is therefore believed that the method pays a way for Gbit/s physical key distribution. © 2020, CC0.

关键词： Synchronization

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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...

引用

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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Multiple residual dense networks for reconfigurable intelligent surfaces cascaded channel estimation

arXiv

引用

arXiv 2021年

作者： Jin, Yu Zhang, Jiayi Huang, Chongwen Yang, Liang Xiao, Huahua Ai, Bo Wang, Zhiqin The School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China The Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong University Beijing100044 China Zhejiang Provincial Key Lab of Information Processing Communication and Networking Zhejiang University Hangzhou310007 China College of Computer Science and Electronic Engineering Hunan University Changsha410082 China ZTE Corporation State Key Laboratory of Mobile Network Mobile Multimedia Technology Shenzhen518057 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis Zhengzhou University Zhengzhou450001 China Research Center of Networks and Communications Peng Cheng Laboratory Shenzhen518055 China China Academy of Information and Communications Technology Beijing100191 China

Reconfigurable intelligent surface (RIS) constitutes an essential and promising paradigm that relies programmable wireless environment and provides capability for space-intensive communications, due to the use of low-cost massive reflecting elements over the entire surfaces of man-made structures. However, accurate channel estimation is a fundamental technical prerequisite to achieve the huge performance gains from RIS. By leveraging the low rank structure of RIS channels, three practical residual neural networks, named convolutional blind denoising network, convolutional denoising generative adversarial networks and multiple residual dense network, are proposed to obtain accurate channel state information, which can reflect the impact of different methods on the estimation performance. Simulation results reveal the evolution direction of these three methods and reveal their superior performance compared with existing benchmark schemes. Copyright © 2021, The Authors. All rights reserved.

关键词： Channel estimation

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Pickup Manipulator Design and Its Kinematics Simulation 2

Pickup Manipulator Design and Its Kinematics Simulation

引用

2018 2nd International Symposium on Resource Exploration and Environmental Science, REES 2018

作者： Zhang, Zhongdang Zhang, Zhaoqiang Ma, Shitai Zhou, Haibo Tianjin University of Technology 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

In order to improve the flexibility of the pickup manipulator and solve the problem of picking up small sports balls in training ground such as golfing, tennis, and table tennis, a 5-DOF pickup manipulator structure is designed. According to the pickup task requirements of the manipulator, through theoretical calculations, the 86HS series stepping motor is selected as the driving motors of the front end joints. Based on this, the stepping motor control system is designed to realize the closed-loop control of the manipulator. Then the manipulator model is built using D-H method, the inverse kinematics solution is calculated, and the analysis of kinematic theory is conducted. Finally, the targeted pickup point is selected to carry out case simulation analysis of the manipulator, the motion law of the manipulator is verified to be reasonable and the task of picking up small sports balls is completed. © Published under licence by IOP Publishing Ltd.

关键词： Manipulators

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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...

引用

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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