检索结果-内蒙古大学图书馆

An experiment study on a novel constructive hot ring rolling process

Procedia Manufacturing 2020年 50卷 134-138页

作者： Deng Jiadong Liu Jikang Cheng Zhe Qian Dongsheng Mao Huajie Fei Yin School of Automotive Engineering Wuhan University of Technology Luoshi Street 122 Wuhan China Hubei key Laboratory of Advanced Technology for Automotive Components Wuhan University of Technology Luoshi Street 122 Wuhan China Hubei Engineering Research Center for Green & Precision Material Forming Wuhan University of Technology Luoshi Street 122 Wuhan China School of Materials Science and Engineering Wuhan University of Technology Luoshi Street 122 Wuhan China

The traditional rolling process for large ring part is to forge a large ring blank from a large cast ingot firstly and then ring rolling it to a large ring. However, large ingots are more likely to produce casting defects such as voids and composition segregation. The casting defects will bring hereditation to the final ring product, especially for super-large ring whose dimeter is more than ten meters. In this paper, a novel constructive hot ring rolling method to manufacture the high performance large ring is proposed. In this process, ring blank units are forged by high-quality small ingots firstly. Then the ring blank units are assembled together to a large ring blank and surface welded along the unit interface. Finally, the large assembled ring blank is heated and ring rolled to a large seamless ring. To verify the feasibility of the constructive hot ring rolling process, an experiment of constructive hot ring rolling process was carried out in the laboratory condition. Two separated rings are machined firstly. Then cleaning the surface of the two rings and assembling them together. Follow on, the upper and lower interfaces of the assembled ring are welded in the surface areas. Finally, the ring blank is heated to high temperature and deformed by radial ring rolling. The microstructure status and mechanical properties of the forming ring are tested. It is found that the interface is healed after high temperature rolling. The tensile strength of the constructive rolling ring is close to the ring rolled from a seamless ring blank. The research work can provide a new idea for the manufacturing technology of high performance large ring.

关键词： Hot ring rolling large ring constructive forming experiment interface heal

来源：评论

学校读者我要写书评

暂无评论

Dynamics analysis and simulation of a new 6-DOF lower limb rehabilitation robot

Dynamics analysis and simulation of a new 6-DOF lower limb r...

引用

第二届计算智能、工程与技术国际研讨会

作者： Hongbo Wang Musong Lin Yonggan Yan Guowei Liu Bowen Su Chaosheng Zhao Fuhao Wang Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Academy for Engineering & Technology Fudan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University

This paper proposes a new hybrid(parallel–serial) 6-DOF lower limb rehabilitation robot including two mechanical legs and an adjustable seat, which could train in sitting, lying and standing three postures. Each mechanical leg consists of hip joint, knee joint and ankle joint. The dynamics and DOF of the robot are analysed, and the result is verified by the software ADAMS. The result lay the foundation for prototype build in future.

关键词： DOF Dynamics analysis and simulation of a new 6-DOF lower limb rehabilitation robot simulation

来源：评论

学校读者我要写书评

暂无评论

Research on Active Training Model of Rehabilitation Robot Based on Joint Torque Signal

Research on Active Training Model of Rehabilitation Robot Ba...

引用

第二届计算智能、工程与技术国际研讨会

作者： Hongbo Wang Hao Yan Yonggan Yan Yungui Li Baoshan Niu Meng Liu Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Academy for Engineering & Technology Fudan University

This paper constructs a man-machine integrated no-load static model considering the self-balancing of the mechanism, obtains the mapping relationship among joint variable, no-load torque,measured torque and end-force of the *** to the damping control strategy, the end force and speed mapping function planning is *** joint angular velocities based on the kinematic inverse solution are calculated, which are important parameter of man-machine coupling motion.

关键词： Research on Active Training Model of Rehabilitation Robot Based on Joint Torque Signal Active Model

来源：评论

学校读者我要写书评

暂无评论

A Moisture-Assisted Rechargeable Mg−CO2Battery

引用

Angewandte Chemie 2022年第17期134卷

作者： Chenyue Zhang Dr. Aoxuan Wang Longyuan Guo Prof. Jin Yi Prof. Jiayan Luo Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineer and Technology Tianjin University Tianjin 300072 China Institute for Sustainable Energy/College of Sciences Shanghai University Shanghai 200444 China Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P.R. China

New sustainable energy conversion and storage technologies are required to address the energy crisis and CO 2 emission. Among various metal–CO 2 batteries that utilize CO 2 and offer high energy density, rechargeable Mg−CO 2 batteries based on earth-abundant and safe magnesium (Mg) metal have been limited due to the lack of a compatible electrolyte, operation atmosphere, and unambiguous reaction process. Herein, the first rechargeable nonaqueous Mg−CO 2 batteries have been proposed with moisture assistance in a CO 2 atmosphere. These display more than 250 h cycle life and maintain the discharge voltage over 1 V at 200 mA g −1 . Combining with the experimental observations and theoretical calculations, the reaction in the moisture-assisted Mg−CO 2 battery is revealed to be 2 Mg+3 CO 2 +6 H 2 O↔2 MgCO 3 ⋅3 H 2 O+C. It is anticipated that the moisture-assisted rechargeable Mg−CO 2 batteries would stimulate the development of multivalent metal-CO 2 batteries and extend CO 2 fixation and utilization for carbon neutrality.

关键词： Battery Reaction CO2 Utilization Mg−CO2 Batteries Moisture Assistance Rechargeability

来源：评论

学校读者我要写书评

暂无评论

New Method for Type Synthesis of 2R1T Redundant Driven Parallel Mechanisms

引用

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering 2019年第23期55卷 25-37页

作者： Li, Yongquan Zhang, Yang Guo, Yu Li, Xuran Zhang, Lijie Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao066004 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qinhuangdao066004 China

In the fields of milling, riveting and welding, 2R1T DOF actuators are required, especially in high stiffness, large workspace, good driving stability and other occasions, redundant actuators are required to improve the performance of 2R1T parallel mechanism. Therefore, based on Grassmann linear geometry and atlas method, a new method for typy synthesis of 2R1T redundant actuated parallel mechanism is proposed. The degree-of-freedom curve of the moving platform is obtained according to the motion mode of the mechanism, and then the constraint curve of the moving platform is obtained according to the dual rule. The redundant constraint curve and its equivalent curve were obtained by adding redundant lines to the moving platform constraint curve. According to the allocation principle of branch chain constraint, it is divided into 7 schemes. The corresponding branch chain are constructed based on the constraint scheme by using the atlas method, and the preliminary type of the mechanism is synthesized according to the selection and allocation rule of the branch chain. Each scheme synthesizes 12, 67, 96, 0, 12, 48 and 16 new types respectively, and a total of 251 new types are synthesized, including some 2R1T redundant parallel mechanisms studied in literature. The instantaneous analysis of the synthesized mechanism is carried out by the atlas method, and it is found that the synthesized mechanism of scheme 1 and scheme 2 is instantaneous. An improved method of coaxial placement with a pair of parallel force constraints in this kind of mechanism is proposed to eliminate its instantaneity. The feasibility and rationality of the synthesis method are verified by instantaneous analysis. The method is also suitable for type synthesis of redundant 4, 5 and 6 DOF parallel mechanisms. © 2019 Journal of Mechanical Engineering.

关键词： Mechanisms

来源：评论

学校读者我要写书评

暂无评论

Structure Parameters and Displacement Equations of Goldberg Mechanisms With the Rank More Than sixStructure Parameters and Displacement Equations of Goldberg Mechanisms With the Rank More Than Six

Research Square

引用

Research Square 2020年

作者： Zhang, Yitong Lu, Ling Liu, Wenlan Li, Yanwen Hu, Bo Mu, Dejun Lu, Wenjuan Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of National Education Yanshan University Qinhuangdao066004 China Heavy-duty Intelligent Manufacturing Equipment Innovation Center of Hebei Province Yanshan University Qinhuangdao066004 China College of Energy and Power Engineering Lanzhou University of Technology Lanzhou730050 China

An infinite number of N-bar Goldberg mechanisms with the rank more than six are proposed. A single closed-loop eight-bar mechanism is first developed by removing the common side links of adjacent loops from the five-loop Bennett mechanism in which all loop frames are collinear. An analysis of trajectory circles of the links shows that the mechanism developed maintains the original constraint conditions and kinematic characteristics, and that its degree of freedom (DOF) is also one. This novel single-loop mechanism is named the eight-bar Goldberg mechanism because of its similar constraint characteristics with the five-bar and six-bar Goldberg mechanisms. The eight displacement parameters of this mechanism are analyzed by using the interior angles of adjacent links, and the five cosine equations for the tangent product of the stagger angles between adjacent links are established in together with one angular displacement equation of odd links and one angular displacement equation of even links. This novel mechanism has one DOF, eight displacement parameters and seven independent displacement equations. The loop rank of the eight-bar Goldberg mechanism is seven, which revises the existing mechanism theory of single closed-loop mechanisms with the rank no more than six. Similarly, a nine-bar Goldberg mechanism is constructed, and its nine displacement parameters are analyzed. This mechanism has eight independent displacement equations and the loop rank is eight, proving that the mechanisms with the rank more than six are not rare. Then, according to the characteristics of the independent displacement equations of the eight-bar and nine-bar Goldberg mechanisms, the N (N>7) displacement parameters of N-bar Goldberg mechanisms are analyzed, and the (N–1) independent displacement equations are deduced with odd and even Ns. It is proved that the loop rank of N-bar Goldberg mechanisms is (N–1), so there exist an infinite number of mechanisms with the rank more than six. © 202

关键词： Degrees of freedom (mechanics)

来源：评论

学校读者我要写书评

暂无评论

Effect of Temperature on the Dispersion of Graphene in Graphene Reinforced Aluminum Matrix Composite

引用

IOP Conference Series: Materials Science and Engineering 2020年第1期774卷

作者： Qiang Wang Qingze Sun Shengyong Chen Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao 066004 China

The influence of hot pressing temperature on the dispersion of graphene (GR) in GR reinforced aluminum matrix composites was investigate. The microstructures of the sample were observed by optical microscope, scanning electron microscopy and energy dispersion spectrum, respectively. The temperature is hold at 640-750°C, and the interval is 10°C. The results show that GR is mainly distributed at the grain boundary at 640 °C. And GR is dispersed in the aluminum matrix, without obvious agglomeration at the temperature from 670 °C to 680 °C. However, GR is agglomerated in the aluminum matrix and has obvious regional differentiation at 690-750 °C, in which the concentrated area of GR is in the middle of the sample, and the dilution area in the rest.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Comfort degree of patients' rehabilitation training based on DSmT theory

Comfort degree of patients' rehabilitation training based on...

引用

第二届计算智能、工程与技术国际研讨会

作者： Hongbo Wang Hao Yan Baoshan Niu Xincheng Wang Yafeng Li Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Academy for Engineering &Technology Fudan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University

This paper aims to solve the problem that most rehabilitation robots lack to integrate their physiological functions and psychological states into closed controlling loop in rehabilitation training of stroke patients. The application of fusion technology of multi-electromechanical sensor signal and DSmT signal is used to achieve patients' comfort judgement. Mean value and variance are used to extract physiological information such as heart rate, temperature and skin resistance. Sensor informationof fusion technology of rehabilitation robot based on classical DSmT theory can realize on-line diagnosis of multi-comfort degree of patients' coupling.

关键词： Comfort degree of patients rehabilitation training based on DSmT theory

来源：评论

学校读者我要写书评

暂无评论

Medical Additive Manufacturing: From a Frontier technology to the Research and Development of Products

引用

Engineering 2020年第11期6卷 1217-1221页

作者： Guixing Qiu Wenjiang Ding Wei Tian Ling Qin Yu Zhao Lianmeng Zhang Jian Lu Daijie Chen Guangyi Yuan Chengtie Wu Bingheng Lu Ruxu Du Jimin Chen Mo Elbestawi Zhongwei Gu Dichen Li Wei Sun Yuanjin Zhao Jie He Dadi Jin Bin Liu Kai Zhang Jianmo Li Kam WLeong Dewei Zhao Dingjun Hao Yingfang Ao Xuliang Deng Huilin Yang ShaoKeh Hsu Yingqi Chen Long Li Jianping Fan Guohui Nie Yun Chen Hui Zeng Wei Chen Yuxiao Lai Department of Orthopedics Peking Union Medical College HospitalChinese Academy of Medical Science 8 Peking Union Medical CollegeBejjing 100730.China National Engineering Research Center of Light Alloys Net Forming&State Key Laboratony of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240China Notional Engineering Research Center of Mg Materials and Applicarions and School of Materials Science 8r Engineering.Shanghai Jlao Tong University Shanghai 200240China Department of Spine Surgery Beijing Jishuitan HospitalBeijing 100035China Center for Troanslational Medicine Research and Development Institute of Biomedical and Health EngineeringShenzhen Insitute of Advanced Technology.Chinese Academy of SciencesShenzhen 518055China Guangdong Engineering Laboratony of Biomaterials Additive Manufacturing Guangdong 518055China Musculoskeletal Research Laboratory of the Department of Orthopedics 8 Traumatology and Innovative Orthopedic Biomaterial and Drug Translational Research Laboratory Li Ka Shing Institute of Health SciencesThe Chinese University of Hong KongHong Kong 999077.China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Center for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstiuteShenzhen 518057.China Hong Kong Branch of National Precious Metals Material Engineering Research Center Department of Material Science and EngineeringCity Untiversity of Hong KongHong Kong 999077.China Department of Mechanical Engineering ity Untiversity of Hong Kong.Hong Kong 9977 China School of Pharmacy.Shanghai Jiao Tong University Shanghai 200240China China State Instute of Pharmaceutical Industry Shanghai Institute of Pharmaceutical IndustryShonghai 201203China Shanghai Innovation Instinute for Materials Shanghai 200444.China State Key Laboratory of High-Performance Ceramies and Superfine Microstructure Shanghai Institute of CeramicsChinese Acadermy 0f SciencesShanghai 200050Ch

*** and development(R&D)and the challenges of raw materials for medical additive manufacturing Raw materials for medical additive manufacturing have a wide range of commonalities that are also seen in many other fields,making them an important basis in the field of three-dimensional(3D)*** and challenges related to material types,powder properties,formability,viscoelasticity,and so forth also share common *** example,many metal materials are used in the field of aviation,while metals,polymers,and inorganic materials are used in the field of *** most widely used materials in biomedicine are *** homogeneous and non-homogeneous composites are also available for 3D printing,and impose an additional challenge in additive manufacturing;the use of heterogeneous composites in 3D printing is particularly challenging.

关键词： composites printing additive

来源：评论

学校读者我要写书评

暂无评论

Configuration Design and Mobility Analysis of the Scissors Overconstrained Double-Ring Truss Deployable Antenna Mechanism

引用

Jiqiren/Robot 2019年第3期41卷 362-371and383页

作者： Han, Bo Han, Yuanyuan Xu, Yundou Yao, Jiantao Zhao, Yongsheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao066004 China Department of Mathematics and Computer Science Hengshui University Hengshui053000 China

Based on the overconstrained scissors mechanism unit, a scissors overconstrained double-ring truss deployable antenna mechanism is constructed as a support mechanism for the satellite antenna. Firstly, the configuration mechanism and overconstraint characteristics of the scissors overconstrained double-ring truss mechanism are analyzed, and the units of the whole truss mechanism are decomposed. Then, the geometric conditions for the ring structure of the scissors overconstrained double-ring truss mechanism are derived in consideration of the effects of joint size. Furthermore, the screw constraint topology of the decomposed mechanism units is drawn based on the graph theory and screw theory, and the mobilities of the closed-loop deployable mechanism unit and the double-ring truss mechanism are analyzed. The result shows that the mobility of the whole double-ring truss mechanism is the same as that of the closed-loop deployable mechanism, with only one mobility. Finally, a simulation model of the double-ring truss deployable antenna mechanism is built, the deploying process of the whole double-ring truss is simulated, and the deployable feature is verified. The proposed scissors overconstrained double-ring truss deployable antenna mechanism has only one mobility, its kinematic joints are all revolute joints, and the movement form is simple. © 2019, Science Press. All right reserved.

关键词： Screws

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：