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Analytical and Experimental Studies of the Improved Conductance-Stability and Stretchability of the Liquid Metal-Embedded Composites Based on a Novel Continuous Annular-Shaped Branch Channels

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SSRN 2023年

作者： Li, Jing Wang, Xi Guo, Shu Chen, Shuang Luo, Yiwen Zhao, Shiyan School of Mechanical Engineering Hubei Modern Manufacturing Quality Engineering Key Laboratory Hubei University of Technology Hubei Wuhan430068 China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Sichuan Chengdu611731 China School of Vehicle and Energy Yanshan University Hebei Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao066004 China

Stretchable and conductance-stable composites are critical for progress in flexible electronics. Tremendous efforts have focused on engineering electrical conductors from liquid metal-embedded elastomers. While these elastomers enable elastic compliance and deformability, the embedded liquid metal is vulnerable to puncture that cause undesired electrical failure, and most of the conductive elastomers are strain sensitive with degenerative conductance upon deformations. Here, we combined analytical and numerical analyses with experimental studies to investigate effects of the innovatively designed continuous annular-shaped branch channels, inspired by the Tesla valve, on the performances of the LM-embedded conductive composite. Theoretically, in the process of mechanical deformations, the as-proposed continuous annular-shaped architecture can dissipate the pressure energy of the fluidic LM to enhance the fracture toughness of the composite, while the LM flow could be accelerated as the deformation was removed to maintain the percolated conductive path, leading to excellent conductive stability. Experimentally, the as-fabricated composite conductor with continuous annular-shaped branch channels can be stretched up to ~80% (more than two times higher than conventional LM-embedded composite), and upon fully activating the conductive pathway, a very high conductivity of ~4×104 S·m-1 and conductance change of less than 2% under varied deformations, including stretching, flexing, twisting and compressing, are realized. It is believed that this novel design strategy will extend the understanding and application opportunities of LM as functional materials in the development of flexible electronics. © 2023, The Authors. All rights reserved.

关键词： Liquid metals

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Kinematic, Workspace and Force Analysis of a five-DOF Hybrid Manipulator R(2RPR)R/SP+RR

Research Square

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Research Square 2021年

作者： Xu, Yundou Yang, Fan Mei, Youen Zhang, Dongsheng Zhou, Yulin Zhao, Yongsheng Laboratory of Parallel Robot and Mechatronic System of Hebei Province Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology Science of Ministry of National Education Yanshan University Qinhuangdao006004 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China Tencent Robotics X Tencent Holdings Shenzhen518057 China

In the present study, the over-constrained hybrid manipulator R(2RPR)R/SP+RR is considered as the research objective. In this paper, kinematics of the hybrid manipulator, including the forward and inverse position, are analyzed. Then, the workspace is checked based on the inverse position solution to evaluate whether the workspace of the hybrid manipulator meets the requirements, and the actual workspace of the hybrid robot is analyzed. After that, the force analysis of the over-constrained parallel mechanism is carried out, and an ADAMS-ANSYS rigid-flexible hybrid body model is established to verify the simulation. Based on the obtained results from the force analysis, the manipulator structure is design. Then, the structure optimization is carried out to improve the robot stiffness. Finally, calibration and workspace verification experiments are performed on the prototype, cutting experiment of an S-shaped aluminum alloy workpiece is completed, and the experiment verifies the processing ability of the prototype and proves that the prototype has good application prospects. © 2021, CC BY.

关键词： Kinematics

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A Stretchable and Conductance-Stable Composite Based on a Liquid Metal-Embedded Elastomer with Continuous Annular-Shaped Branch Channels

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SSRN 2023年

作者： Li, Jing Chen, Shuang Guo, Shu Luo, Yiwen Zheng, Zhong Li, Xiuhong Zhao, Shiyan School of Mechanical Engineering Hubei Modern Manufacturing Quality Engineering Key Laboratory Hubei University of Technology Hubei Wuhan430068 China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Sichuan Chengdu611731 China School of Vehicle and Energy Yanshan University Hebei Qinhuangdao066004 China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao066004 China

Stretchable and conductance-stable composites are critical for progress in flexible electronics. Tremendous efforts have focused on engineering electrical conductors from liquid metal-embedded elastomers. While these elastomers enable elastic compliance and deformability, the embedded liquid metal is vulnerable to puncture that cause undesired electrical failure, and most of the conductive elastomers are strain sensitive with degenerative conductance upon deformations. Here, we report a versatile and practical approach to prepare stretchable LM-embedded elastomeric conductors with continuous annular-shaped branch channels. In the process of mechanical deformations, the annular-shaped branch channels can dissipate the pressure energy of the fluidic LM to enhance the fracture toughness of the composite, while the LM flow could be accelerated as the deformation was removed to maintain the percolated conductive path, leading to excellent conductive stability. The as-proposed composite conductor can be stretched up to ~80% (two times higher than conventional LM-embedded composite), and upon fully activating the conductive pathway, a very high conductivity of ~4×104 S·m-1 and conductance change of less than 2% under varied deformations, including stretching, flexing, twisting and compressing, are realized. It is believed that this novel design strategy will extend the application opportunities of LM as functional materials in the development of flexible electronics. © 2023, The Authors. All rights reserved.

关键词： Liquid metals

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Erratum to:Finite element simulation and experimental test of the wear behavior for self-lubricating spherical plain bearings

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Friction 2024年第7期12卷 1620-1620页

作者： Yahong XUE Jigang CHEN Sumin GUO Qingliang MENG Junting LUO School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing Yanshan UniversityQinhuangdao 066004China Education Ministry Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan UniversityQinhuangdao 066004China

Erratum to Friction 10(6):803–841(2022)Yahong Xue,Jigang Chen,Sumin Guo,Qingliang Meng&Junting *** element simulation and experimental test of the wear behavior for self-lubricating spherical plain *** 6(3):297–306(2018).https://***/10.1007/s40544-018-0206-x The authors regret that there was an inadvertent error in Fig.10(c)after checking the *** is important to note that the change does not impact the main conclusion of the *** 10(c)on page 304 was selected as the incorrect picture,and the accurate version of Fig.10(c)is provided as below.

关键词： wear Friction bearings

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Design of a new solution for the wheeled hopping robot

Design of a new solution for the wheeled hopping robot

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UKACC International Conference on Control (CONTROL)

作者： Jingjing Liu Hongbo Wang Hongnian Yu Lili Zhang Luige Vladareanu Adrian Bruja Gal I. Alexandru Parallel Robot and Mechatronic System Laboratory of Hebei Province Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao China College of Electrical Engineering Yanshan University Qinhuangdao China School of Design Engineering and Computing Bournemouth University Poole UK Robotics and Mechatronic Department Institute of Solid Mechanics Bucharest Romania

In recent years many researchers are trying to combine wheeled movement with legged movement or hopping movement to strengthen the robots adaptability to environment. Hybrid robots are playing a more and more important role in our modern life. However, their controls are mostly complicated. So in this paper we present a new solution for the wheeled hopping robot. Based on the mechanical design, this robot has two movement modes: wheeled and hopping movement mode. While the center of gravity of the mechanism is under the wheels center, the wheeled hopping robot which is like a tumbler can keep its stability even when the wheels' velocity is zero. In this paper, we firstly introduce the description and design of the wheeled hopping robot. Then we explain how to choose the robot parameters and lastly we describe, how the robot through hopping, successfully traverses obstacles and ditches.

关键词： Mobile robots Shafts Wheels Springs Robot kinematics Force

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Chaotification of chain system via feedback control

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ICIC Express Letters 2015年第10期9卷 2851-2857页

作者： Liu, Wen Liu, Man Zhang, Desheng Zhao, Jingyi Zhang, Yanyan School of Science Yanshan University No. 438 Hebei Avenue Qinhuangdao China College of Mechanical Engineering Yanshan University No. 438 Hebei Avenue Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education of China Yanshan University No. 438 Hebei Avenue Qinhuangdao China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University No. 438 Hebei Avenue Qinhuangdao China

In this paper, a feedback control method is proposed for chaotification of chain system by using model matching and tracking control. The error system between the controlled chain system and the reference chaos system is asymptotically stable at zero point, which guarantees that chain system tracks reference chaos system asymptotically. The proposed method is applied to chaos anti-control of the second order chain system and the third order one, while Duffing oscillator and Ameodo system are considered as the reference models. The method avoids computation complexity of Lyapunov exponent. The numerical simulation results show the effectiveness of the proposed method. © 2015, ICIC International.

关键词： Feedback control

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Design and Research of New Large Flow Three-way Pressure Compensation Valve

Design and Research of New Large Flow Three-way Pressure Com...

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IEEE International Conference on Aircraft Utility Systems

作者： Xiaodong Yang Xiaolong Zhao Chao Ai Gang Peng Zhimin Wang Jianpei Dou Xiaodong Wu Yuejun Li Beijing Huade Hydraulic Industrial Group Co. Ltd Beijing 101500 China Beijing Huade Hydraulic Industrial Group Co Ltd Beijing 101500 China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control as well as Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao 066004 China

ISBN: (纸本)9781509010882

In the hydraulic systems with fixed displacement pump, there is a problem that the flow of three-way pressure compensation valve working with LUDV multi-way valve is low. So a new large flow pressure compensation valve was designed. The valve contains a main channel and two overflow channels. Through bench test and field experiments, the new large flow three-way pressure compensated valve was verified with good unloading pressure characteristics and good pressure compensation characteristics in large flow working conditions. The flow of new valve can reach 400 L/min and unloading pressure can reduce to 3MPa. Thus, the new valve meets the requirements of LUDV multi-way valve under large flow condition. The new large flow three-way pressure compensation valve makes an important contribution to the further research on multi-way valve.

关键词： Valves Cavity resonators Springs Crawlers Cranes Oils VALVE GATE pressure compensation resonant cavities Crawlers Gruidae Cranes springs Device Spring oils

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Kinematics and statics analysis of a novel 4-dof parallel manipulator with two SPS legs and a PUP composite leg

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ICIC Express Letters 2014年第12期8卷 3445-3451页

作者： Lu, Yi Zhang, Xiuli Hu, Bo College of Mechanical Engineering No. 438 West Hebei Street Qinhuangdao China Hebei Vocational and Technical College of Building Materials Qinhuangdao China Parallel Robot and Mechatronic System Laboratory of Hebei Province No. 438 West Hebei Street Qinhuangdao China Key Laboratory of Advanced Forging and Stamping Technology and Science Ministry of Education Yanshan University No. 438 West Hebei Street Qinhuangdao China

A novel 4-degree of freedom parallel manipulator with two spherical joint-prismatic joint-spherical joint (SPS) active legs and a prismatic joint-universal joint-prismatic joint (PUP) composite leg is proposed and its kinematics and statics are studied. 1. Its structure constraint is analyzed, and formulae for solving the inverse displacement are derived. 2. The formulae for solving velocity, acceleration and active/constrained forces are established. 3. A workspace is constructed. 4. The analytic results are verified by its simulation mechanism. © 2014.

关键词： Kinematics

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Kinematic characteristics analysis and assembly application of a spatial symmetric 7R mechanism

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Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica 2019年第4期40卷 422536页

作者： Han, Bo Xu, Yundou Yao, Jiantao Zheng, Dong Zhang, Shuo 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

A spatial symmetric 7R mechanism is proposed in this paper, constructing space deployable mechanisms. Firstly, the overall degree of freedom (DOF) is analyzed based on the screw constraint topology diagram, obtaining the variation of DOFs of the whole mechanism when the orientation of the joint axes changes. Then, the number and nature of DOFs of the motion output component in different orientations of the joint axes are analyzed based on the inverse screw theory. and the transient nature of the DOFs are analyzed. It is found that passive DOF and instantaneous DOF occurred in the arrangement of different joint axes orientations. Furthermore, the singular characteristics of the mechanism in different driving conditions are analyzed, obtaining the geometric conditions of the mechanism in the singular configuration under different driving conditions. Finally, a class of single-DOF polygonal pyramid-shaped space deployable mechanism is constructed by combining spatial symmetric 7R mechanisms with DOF at one. By setting the joint axes orientations, the mechanism yields a large folding rate, and due to its singular properties, it has good mechanical properties. Through the combination of a plurality of pyramid-shaped space deployable mechanisms, new large-scale space deployable mechanisms can be constructed, showing good application prospects in the aerospace field. © 2019, Press of Chinese Journal of Aeronautics. All right reserved.

关键词： Mechanisms

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Process Optimization of A356 Aluminum Alloy Wheel Hub Fabricated by Low-Pressure Die Casting with Simulation and Experimental Coupling Methods

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SSRN 2023年

作者： Bi, Jiang Dong, Guojiang Zhang, Liping Ma, Shaozhong Zhang, Dongsheng Wang, Ji Li, Wen Xu, Zuo Li, Shide Starostenkov, Mikhail Dmitrievich Yanshan University China Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Qinhuangdao066004 China CITIC Daika Co. Ltd. Qinhuangdao066004 China Hebei Key Laboratory of Special Delivery Equipment Yanshan University Qinhuangdao066004 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China General Physics Department Altai State Technical University Leninst. 46 Barnaul656099 Russia

The aluminum alloy wheel hub is mainly produced by low-pressure die casting process (LPDC), which casting quality is related to the process parameters. In this paper, the LPDC process of the A356 alloy wheel hub was simulated by ProCAST software, and the forming quality of the wheel hub under different cooling processes has been studied. The result indicated that the liquid aluminum exhibited different solidification characteristics under three cooling processes of 300 L/min for 150 s, 400 L/min for 140 s and 500 L/min for 130 s, and the wheels showed a sequential solidification state under the condition of 400 L/min for 140 s. By comparing the tensile properties of the rim under 300 L/min for 150 s and 400 L/min for 140 s cooling processes, it was found that the latter had higher tensile strength and elongation, which were 178.9 MPa and 6.6%, respectively. The reduction of casting defects, microstructure refinement and uniform distribution of eutectic Si particles in the wheel hub are the main reasons for the improvement of mechanical properties. © 2023, The Authors. All rights reserved.

关键词： Microstructure

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