检索结果-内蒙古大学图书馆

A novel method to increase energy density of permanent magnet machine based on multi-physical field analysis

UPB Scientific Bulletin, Series D: Mechanical Engineering 2020年第4期82卷 79-92页

作者： Zheng, Qingchun Zhao, Yangyang Zhu, Peihao Wang, Sen Liu, Jingna Ma, Wenpeng Li, Xiang Xiao, Yinhong Wang, Naixin Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China School of Computer Science Tianjin University of Technology Tianjin300384 China School of Automation Shenyang Institute of Engineering Shenyang110136 China Baoding Power Supply Company Hebei Electric Power Company State Grid Corporation of China Baoding071000 China

As an important component of all-electric aircraft, the main propulsion machine is developing towards high energy density, high efficiency and high fault tolerance. In order to improve the energy density of main propulsion machine for all-electric aircraft, a novel approach, which can be used for excellent performance improvement of electric machine of all-electric aircraft, is reported in this paper. The analytical formula of energy density is put forward and the design method of high energy density permanent magnet machine is presented. A high energy density machine with rated power of 30kW is designed, and the electromagnetic field simulation analysis, strength and stress structure verification, temperature field simulation analysis and multi-physical field coupling analysis are obtained. A prototype is developed, the experiment platform is established, and experiments are performed. The energy density of main propulsion machine designed is up to 21kW·N·m/kg2, and the index is increased by 3.2 times. The optimal method based on the multi-physical field analysis can be also applied to other high energy density machines. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： Electromagnetic fields

来源：评论

学校读者我要写书评

暂无评论

Cyber-Physical-Social systems for Smart City: An Implementation Based on intelligent Loop

引用

IFAC-PapersOnLine 2020年第5期53卷 501-506页

作者： Gang Xiong Xiaoyu Chen Nan Shuo Yisheng Lv Fenghua Zhu Tianci Qu Peijun Ye State Key Laboratory for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing 100049 China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing The Cloud Computing Center Chinese Academy of Sciences Dongguan 523808 China Graduate School of System Design Tokyo Metropolitan University Tokyo 191-0065 Japan

Cyber-Physical-Social systems (CPSS) provides a novel perspective for constructing “Smart City”, which is also known as the Human-Machine-Things-system (HMTS), focusing on the fusion of ternary space: social network of human society, network of machines and the Internet of things. In this paper, we propose a specific implementation framework of CPSS for Smart City based on intelligent loops, including basic modeling and interactive fusion, state perception and cognition, and adaptive learning. On this basis, an overall architecture of the CPSS platform is designed, which is applied in the urban transportation management in Hangzhou. The application results demonstrate that the intelligent loop could optimize the control and management strategies for actual urban transportation.

关键词： CPSS intelligent Loop Human-Cyber-Physical Ternary Space

来源：评论

学校读者我要写书评

暂无评论

Collaborative Optimization of Cyber Physical Social systems for Urban Transportation Based on Knowledge Automation

引用

IFAC-PapersOnLine 2020年第5期53卷 572-577页

The integration of signals from physical, social and cyber spaces, known as Cyber-Physical-Social systems (CPSS), is a new research paradigm for urban transportation, where the traffic control and management (C&M) is collaborative optimized among the three sub-systems. Though some technologies and optimization methods have been studied since its proposition, there is a lack of a systemic architecture as well as an overall implementation about how to efficiently exploit the social signals. For this reason, this paper proposes a general framework of CPSS for urban transportation and presents a feasible solution for traffic optimization based on knowledge automation. The specific implementation includes basic modeling of CPSS, knowledge evolution and reasoning, and collaborative optimization of C&P strategies. As a remarkable highlight, the influence of both individual activities and social learning is concerned during knowledge evolution and reasoning part. A case study from the application in the city of Dongguan is also given to validate our proposed framework and methods, showing that they can efficiently improve the average speed of the actual transportation.

关键词： CPSS knowledge automation urban transportation Collaborative Optimization

来源：评论

学校读者我要写书评

暂无评论

Vibration Absorption Efficiency and Higher Branches Elimination of Variable-Stiffness Nonlinear Energy Sink

引用

Journal of Harbin Institute of Technology 2020年第1期

作者： Rui Zhong Jian’en Chen Weimin Ge Jun Liu Xiaofeng Wang Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System National Demonstration Center for Experimental Mechanical and Electrical Engineering Education

来源：评论

学校读者我要写书评

暂无评论

Research on Fast Error Calibration Methods for Flexible Measuring Arm

Research on Fast Error Calibration Methods for Flexible Meas...

引用

International Conference on Artificial Intelligence and Advanced Manufacturing (AIAM)

作者： Xinhua Zhao Lei Zhao Liangping Ji Jiaxing Zhang School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering 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 National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China

Based on the structure of the joint coordinate measuring machine, the error calibration of the flexible measuring arm is systematically and deeply researched. The straightness error data of the two linear guide rails are obtained by measuring the high-precision square box. Then, the slope of the straightness error curve is obtained by least squares method, and the verticality error can be also calculated. The parallelism error for two rotation axes can be calibrated by test a precision flat. Its result can be quickly compute based on the sampling data. The proposing calibration methods have low cost, easy operation, high efficiency and small environmental restrictions than external calibration by expensive instruments. The experiment has proved the validity and feasibility of the above method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Simulation of crystal plasticity of P92 heat resistant steel considering martensitic lath structure

引用

Journal of Physics: Conference Series 2021年第1期2079卷

作者： Xinyu Wang Junjie Shen Xiangru Guo Jixin Qiao 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

Based on the theory of crystal plasticity, coupled with dislocation and lath hardening models, this paper establishes a crystal plasticity finite element model describing the high temperature creep of P92 steel. Open source software was used to generate lath models with an average size of 350nm, 650nm and 950nm to explore the effect of lath coarsening on the high-temperature creep behavior of P92 steel. The results show that the roughening of the slats increases the rate of creep deformation, resulting in a decrease in the service life of the material. Observing the slat model, it can be seen that the roughening of the slats enlarges the numerical gradient of stress and strain, and aggravates the overall plastic strain of the model. The coarsening of the slats accelerates the movement of dislocations, causing the density of movable dislocations to increase, and at the same time the shear strain amplitude of the slip system increases, thereby reducing the hardening behavior of the material.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Augmented Reality and Quick Response Code Technology in Engineering Drawing Course

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

引用

IEEE International Conference on Mechatronics and Automation

作者： Xiaofei Wang Chenfei Chen Zhaotong Li 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 School of Electrical and Electronic Engineering Tianjin University of Technology Tianjin China School of Mechanical Engineering Tianjin University of Technology Tianjin China

ISBN: (数字)9781728164168

ISBN: (纸本)9781728164175

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Locomotion Mode Recognition based on Foot posture and Ground Reaction Force 15

Locomotion Mode Recognition based on Foot posture and Ground...

引用

15th International Conference on Ubiquitous Robots, UR 2018

作者： Zhu, Aibin Li, Ying Wu, Yuexuan Wu, Mengke Zhang, Xiaodong Key Laboratory of Intelligent Robot of Shaanxi Province Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'an Jiaotong University Xi'an710049 China Shaanxi University of Science Technology Xi'an710000 China

ISBN: (纸本)9781538663349

Efficient and accurate locomotion mode recognition is the basis and the key to compliance control of exoskeleton. Considering the fact that single ground reaction force information can not realize continuous gait phase recognition in the whole gait cycle and traditional inertial sensors' installation method tends to cause binding error, this paper established a wearable gait analysis system based on inertial sensor and foot pressure sensor which entirely embedded in a shoe insole. An inertial sensor mounting structure for foot posture information acquisition was designed to reduces the binding errors caused by the uncertain binding position and the random errors caused by the relative position changes with the movement. Two force sensors was set to measure the force load on the shoe insole at the heel and the forefoot during walking. Then, the gait curve of the normal human beings measured by this wearable gait analysis system is segmented by a periodic segmentation method combining power spectrum and feature points, and features is extracted from the time series of sensor signals according to the characteristics of the human gait. Probabilistic neural network is used to identify the locomotion modes and to verify the effectiveness of this wearable gait analysis system, experiments on different terrains are performed. The experiment results show that this method can effectively reduce binding error and random error, and reflect the foot movement during walking. Furthermore, the measurement method can accurately and effectively identify level-ground walking, stair ascent and stair decent, showing great potential for further development and applicability in control of exoskeleton. © 2018 IEEE.

关键词： Random errors

来源：评论

学校读者我要写书评

暂无评论

Small Cluster Underwater Robot design with Variable Pitch Propeller 15

Small Cluster Underwater Robot design with Variable Pitch Pr...

引用

15th International Conference on Ubiquitous Robots, UR 2018

作者： Zhu, Aibin Song, Jiyuan Li, Ying Wu, Mengke Zhang, Xiaodong Key Laboratory of Intelligent Robot of Shaanxi Province Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi'an Jiaotong University Xi'an710049 China Shaanxi University of Science Technology Xi'an710021 China

ISBN: (纸本)9781538663349

Most underwater robots use multiple sets of thrusters with motors and propellers to drive them independently that makes them bulky, inflexible and complex. In this paper, the propeller is innovatively designed that it can change the pitch that can be applied to underwater robots. The compact design, propeller response speed and high movement flexibility are the biggest advantage of this robot over current conventional designs. The movement of robot is controlled by three propellers and their rotations are driven by a common motor and each propeller is equipped with a servo to control the pitch. Transmission structure designed is symmetrical and compact that creates dynamic balance of the strong structure in itself. The retractable float completes the data transfer between the robot and the ground control also informs space assisted position of the robot when it is underwater and the float is outside of water. In addition, the robot also includes a matching electronic drive and remote control box. Basic movement requirements can be achieved through the independent and coordinated control of the three actuators of the robot. The actual underwater test of the robot verifies the flexibility and horizontal stability of the robot designed. The characteristics of carrying sensors in underwater robots to move more flexibly and effectiveness of the proposed control method is also verified in the actual water test. © 2018 IEEE.

关键词： Robots

来源：评论

学校读者我要写书评

暂无评论

Utilizing Cationic Vacancies and Spontaneous Polarization on Cathode to Enhance Zinc-Ion Storage and Inhibit Dendrite Growth in Zinc-Ion Batteries

引用

Angewandte Chemie 2023年第26期135卷

作者： Dr. Liqi Bai Zihan Hu Cheng Hu Songge Zhang Dr. Yiran Ying Yingge Zhang Lu Li Hanfang Zhang Dr. Nan Li Dr. Shanshan Shi Shuo Liu Dr. Lin Hao Tongyao Liu Prof. Hongwei Huang Prof. Haitao Huang Prof. Yihe Zhang Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Material Sciences and Technology China University of Geosciences Beijing 100083 China Department of Applied Physics and Research Institute for Smart Energy The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China Contribution: Writing - original draft (lead) Writing - review & editing (lead) Faculty of System Design and Intelligent Manufacturing Southern University of Science and Technology Nanshan District Shenzhen Guangdong 518055 China Songshan Lake Materials Laboratory Guangdong 523808 China School of Fashion and Textiles and Research Institute for Intelligent Wearable Systems The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 China

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：