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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Han, Bo Yuan, Zhantu Zhou, Yuanzhi Liu, Feng Yao, Jiantao Zhao, Yongsheng Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Ministry of Education of China Qinhuangdao066004 China

ISBN: (纸本)9789819965038

With the development of astronautics, satellite antenna as an important communication equipment has also gradually developed to large scale. In this paper, a novel ring truss deployable antenna mechanism is proposed. The mechanism has three layers of installation points with height differences between them, which can be used to ensure that all the installation points will be distributed on the profile of the cable network, and this characteristic ensures the mechanism can be utilized to the maximum. Then the degrees of freedom (DOF) and kinematics of the ring truss deployable mechanism are analyzed using screw theory, where the analysis shows that the DOF of the overall ring truss deployable mechanism is equal to one. Following that, the dynamics model about the mechanism unit is established using the second type of Lagrange equations. Based on this dynamic model, the effect of torsion spring stiffness on the deployment process is discussed and the conclusion is verified by simulation. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Trusses

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Research on hydraulic wind turbine semi-physical simulation platform

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High technology Letters 2015年第3期21卷 269-275页

作者：艾超 Chen Lijuan Kong Xiangdong Liao Lihui Chen Wenting Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Key Laboratory of Advanced Forging & Forming Technology and Science(Yanshan University) Ministry of Education School of Mechanical Engineering Yanshan University

According to a research on the 30kVA simulation experimental platform of hydraulic wind tur- bine, its basic structure, composition and operation principle are expounded in this paper. An in- verter motor is used to simulate the wind turbine, while a similarity calculation method is applied be- tween the small and large wind turbine. A fixed displacement pump-variable motor closed loop is used as the main transmission system, and a self-excited synchronous generator generates electricity through the grid connection. The experiment and simulation study on the speed and power control of the hydraulic wind turbine is conducted, based on the experimental platform, thus correctness and progressiveness of the experiment platform is further verified. The experimental platform study lays a foundation for further research on the characteristics of hydraulic wind turhln~

关键词： wind power generation hydraulic transmission simulation of experimental platform

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Processing and simulation of thin-walled shell with inner ribs formed by inner spinning technology

Processing and simulation of thin-walled shell with inner ri...

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International Conference on Industrial, Mechanical and Manufacturing science, ICIMMS 2014

作者： Wang, Zhenjie Guo, Baofeng Ma, Shicheng Education Ministry Key Laboratory of Advanced Forging and Stamping Science and Technology College of Mechanical Engineering Yanshan University QinhuangdaoHebei China Special Material and Technic Institution of Aerospace Beijing China

ISBN: (纸本)9781138026568

The formation of a thin-walled shell structure with inner ribs by inner spinning technology was simulated using the finite element simulation softwareABAQUS. The spinning force and deformation condition were calculated and analyzed in this simulation. Results indicate that a thin-walled cylindrical shell with uniform deformation can be obtained using the inner spinning process with good forming effect. For all the regions, the radial load was found to be greater than the axial load, with the radial load in the range of 0–270 kN. The skin and the back frame sections experience load peaks, which is in the expansion capacity of −200mm for the skin section. The peak load in the rear frame section is stable in a 15mm stroke, which then gradually decreases to zero. The forming load in the front frame increases with the increase in the feed load of the spinning wheel, leading to the possibility of fracture in this region. The axial spinning load is rather small in the range of 0–47 kN. Based on the simulated values of these parameters, we demonstrated the formation of good quality 2A12 aluminum alloy products using the inner spinning technology. © 2015 Taylor & Francis Group, London.

关键词： Deformation

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Microstructure,mechanical properties and multiphase synergistic strengthening mechanisms of a novel laser additive manufactured AlNi6TiZr alloy

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Journal of Materials science & technology 2024年第11期178卷 59-69页

作者： Jiang Bi Liukun Wu Zeqi Liu Haixiang Wang Shide Li Ji Wang Zhuoyun Yang Nannan Lu Xi Chen Mikhail Dmitrievich Starostenkov Guojiang Dong Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education Yanshan UniversityQinhuangdao 066004China CITIC Dicastal Co. Ltd.Qinhuangdao 066004China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China General Physics Department Altai State Technical UniversityLeninist.46Barnaul 656099Russia

In this work,selective laser melting(SLM)process is used to prepare the AlNi6TiZr *** analyzing the printing quality and mechanical properties of the printed specimens with different process parameters,the SLM forming window of AlNi6TiZr is *** relative density of the sample printed with 270 W-1100 mm/s(laser energy density:82 J/mm3)reaches 99.7%,exhibiting excellent mechanical properties(yield strength(YS):421.7 MPa;ultimate tensile strength(UTS):480.4 MPa).After an aging treatment of 325 ℃-12 h,the YS and UTS of the sample increased to 494 MPa and 550.7 MPa,*** Ni,Ti,and Zr components promoted the generation of multi-phase precipitates in the Al alloy and improved the synergistic strengthening effect of *** hard-shell structure(HSS)formed by the Al_(3)Ni phase at the grain boundary significantly strengthened the grain boundary *** precipitated Al_(3)(Ti,Zr)phases at the grain boundaries prevent grain growth and dislocation *** Al_(3)Ni and Al_(3)(Ti,Zr)phases have good thermal stability that can still maintain excellent enhancement effects at high ***6TiZr alloy has great application prospects in medium and high-temperature environments.

关键词： Selective laser melting Al6NiTiZr alloy Microstructure Mechanical properties Thermal stability Strengthening mechanism

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Multi-point flexible straightening process by reciprocating bending for metal profiles

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Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2039-2050页

作者： Xue-ying HUANG Jun ZHAO Gao-chao YU Qing-dang MENG Zhen-kai MU Yan-jun LIU Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

A multi-point flexible straightening process characterized by reciprocating bending is ***,the process is analyzed in terms of deformation mechanism and verified by numerical simulations and physical experiments of the straightening of a series of metal profiles with different materials and initial ***,the relationship between the bending radius and the times of reciprocating bending required to unify the curvature is discussed,and the distribution of residual stress after straightening is *** results show that the reciprocating bending process can eliminate the difference of the initial curvature,make the curvature of each section tend to be uniform;the times of reciprocating bending to reach the uniform curvature decreases with the decrease of bending *** straightness of the straightened profile obtained from the experiment and simulation is less than 0.2%,demonstrating a good feasibility of this method.

关键词： multi-point flexibility metal profile reciprocating bending curvature unification over-bending straightening straightness

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Design and experimental study of the remote control for a novel patient transfer apparatus 5

Design and experimental study of the remote control for a no...

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2020 5th International Seminar on Computer technology, Mechanical and Electrical Engineering, ISCME 2020

作者： Tian, Yu Wang, Hongbo Zhang, Yongshun Tian, Junjie Du, Jiazheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao Hebei China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao Hebei China

This paper introduces the design of the remote control for a novel patient transfer apparatus. First, the overall design of the control system is put forward based on the working principle, and design requirements of the apparatus. Second, voltage regulator circuit of the remote control based on the MC34063 is designed to fit for the OLED displayer, parameters such as the filter capacitor have been determined. Next, wireless communication unit adopted CC1110 and the communication instruction code is introduced. Then, the interaction interface of the remote control is finished to facilitate the implementation of the adjustment functions. finally, a simulation and a real experiment has been completed, it indicates the correctness of the voltage regulator circuit and the effectiveness of the remote control respectively. © Published under licence by IOP Publishing Ltd.

关键词： Remote control

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Comparative study on forming limit prediction of AA7075-T6 sheet with M−K model and Lou−Huh criterion

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Transactions of Nonferrous Metals Society of China 2020年第6期30卷 1463-1477页

作者： Guo-jiang DONG Zhi-wei CHEN Zhuo-yun YANG Bo-cheng FAN Hebei Key Laboratory of Special Delivery Equipment Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of Education of China Yanshan UniversityQinhuangdao 066004China

In order to effectively predict the fracture of AA7075-T6 sheet, the forming limit curves of AA7075-T6 high-strength sheet were drawn according to Morciniak Kuczyski (M K) model and Lou Huh criterion, respectively. The errors between the predicted values of the two theoretical prediction models and experimental values were calculated by error analysis. The forming limit curves were verified by the punch stretch test to evaluate the prediction accuracy of M K model and Lou Huh criterion. The error analysis results show that the mean error of Lou Huh criterion with the optimal parameters for all tensile specimens is 25.04%, while the mean error of M K model for all tensile specimens is 74.24%. The prediction accuracy of Lou Huh criterion in predicting the fracture of AA7075-T6 sheet is higher. The punch stretch test results show that the forming limit curve drawn by Lou Huh criterion can effectively predict the fracture of AA7075-T6 sheet, but the prediction accuracy of M K model is relatively poor.

关键词： ductile fracture criterion M K model forming limit diagram AA7075-T6 sheet

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Kinematics Analysis of a New Parallel Mechanism with Complete Separation of Constraints and Drives 16th

Kinematics Analysis of a New Parallel Mechanism with Complet...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Qiu, Can Wang, Yu Wu, Jiabin He, Xiaoyu Ma, Xuejian Xu, Yundou Zhao, Yongsheng Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan University Qinhuangdao066004 China

ISBN: (纸本)9789819964888

At present, there is a growing demand for parallel mechanisms with fewer inputs and more outputs. These mechanisms are highly sought after in industries such as aerospace, antenna, and entertainment facilities, among others. Therefore, this paper proposes a new parallel mechanism (PM) that utilizes separation of constraints and drives, resulting in centralized drive management. Thereby achieving a small amount of driving to drive multiple parallel moving platforms. For example, 3nRRS/PPPS parallel mechanism. In this study, we utilize the closed-loop vector method to obtain the inverse solution for the 3RRS/PPPS parallel mechanism. To perform a static analysis, we construct a complete Jacobian matrix for the mechanism. Under the premise of satisfying the workspace, the key dimensional parameters of the mechanism were optimized with the objective of improving the load-carrying capacity of the mechanism and minimizing the driving force. The method of complete separation of constraints and drives is easier to centrally manage drives, greatly improving energy utilization and work efficiency, and having a wide range of application scenarios in antenna, entertainment facilities, and other situations. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Inverse problems

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An End-Traction Lower Extremity Rehabilitation Robot: Structural Design, Motion Analysis, and Experimental Validation 23rd

An End-Traction Lower Extremity Rehabilitation Robot: Struct...

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23rd IFToMM China International Conference on Mechanism and Machine science and Engineering, IFToMM CCMMS 2022

作者： Bian, Hui Yang, Fan Sun, Zhaoliang Li, Jiachen Ding, Jiebin Li, Shuai Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan University Hebei Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University Ministry of Education of China Hebei Qinhuangdao066004 China

ISBN: (纸本)9789811993978

An end-traction lower extremity rehabilitation robot named ETLER is designed to meet the rehabilitation needs of patients with lower extremity dysfunction at all stages of recovery, while taking into account the ease of operation for the patient. A single robot can meet the needs of a hemiplegic patient on either side for the designed end-change structure. The robots can also be used in pairs for patients with spinal cord injuries. Meanwhile, the adjustable ankle joint limit design provides customized training programs for the ankle joint. To carry out the trajectory planning of the rehabilitation robot, kinematic analysis and control strategy modeling of the robot and human–machine system are carried out. The functionality and universality of the rehabilitation robot are verified through comparative tests. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Machine design

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Design and analysis of a novel heavy-load positioner with series-parallel mechanism 4

Design and analysis of a novel heavy-load positioner with se...

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4th International Conference on advanced Design and Manufacturing Engineering, ADME 2014

作者： Tang, Yan-Hua Parallel robot and mechatronic system laboratory of Hebei province Yanshan University QinhuangdaoHebei China Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of National Education Yanshan University QinhuangdaoHebei China

ISBN: (纸本)9783038352570

A heavy-load positioner with series-parallel mechanism was put forward according to the heavy-load positioner’s task demand. Two rotational DOFs were realized by the spherical 3-DOF mechanism with a restricted embranchment instead of traditional gear-driven mechanism, the other by the serial part. The mechanism has the advantages of large workspace, good flexibility and high stiffness-to-weight ratio. The kinematics, statics and singularity of the positioner mechanism were analyzed. The mathematic model of the positioner mechanism was established. Combining the workspace demand of the positioner, dimension optimization of the mechanism was researched. Finally, the kinematics, statics and the singularity analysis of the positioner mechanism was verified through virtual prototype designed with one group of satisfied dimensions. © (2014) Trans Tech Publications, Switzerland.

关键词： Kinematics

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