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

Journal of Physics: Conference Series 2021年第6期1748卷

作者： Yu Tian Hongbo Wang Yongshun Zhang Junjie Tian Jiazheng Du Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Qinhuangdao Hebei China Key Laboratory of Advanced Forging & 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.

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Influence of substrate plate heating on the fabrication of Al-12Si produced by selective laser melting

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Transactions of the Indian National Academy of Engineering 2021年第4期6卷 1027-1036页

作者： Xi, L. X. Ma, P. Jia, Y. D. Chaubey, A. K. Wang, Z. Prashanth, K. G. College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components Nanjing University of Aeronautics and Astronautics Nanjing China School of Materials Engineering Shanghai University of Engineering Science Shanghai China School of Materials Science and Engineering Shanghai University Shanghai China CSIR–Institute of Minerals and Materials Technology (IMMT) Bhubaneshwar India Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials South China University of Technology Guangzhou China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou China Department of Mechanical and Industrial Engineering Tallinn University of Technology Tallinn Estonia Erich Schmid Institute of Materials Science Austrian Academy of Sciences Leoben Austria CBCMT School of Mechanical Engineering Vellore Institute of Technology Vellore India

Substrate plate heating is one of the methodology followed during the selective laser melting (SLM) process, to reduce the cooling rate of the process, to reduce the internal stresses in the SLM-fabricated material, to reduce the cracking tendency in some alloys. However, employing substrate plate heating with larger samples may introduce anisotropy and inhomogeneity in both microstructure and properties. To study this effect, Al-12Si samples were fabricated using the SLM process. The samples were produced with (473 K and 673 K) and without substrate plate heating. The sample was also subjected to external treatment at 473 K and 673 K to compare the microstructural effects with the substrate plate-heated samples. The microstructural investigation was carried out using optical and scanning electron microscopy and the structural characterization using X-ray diffraction. The mechanical properties of the samples were tested using room temperature tensile test and hardness maps. The results suggest that the samples fabricated using substrate plate heating lead to anisotropy along the length scale, which is not desirable.

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Microstructural Characterization of Pure Titanium Treated by Laser Surface Treatment Under Different Processing Parameters

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 321-328页

作者： Can Huang Jian Tu Yu-Ren Wen Zhi Hu Zhi-Ming Zhou An-Ping Dong Guo-Liang Zhu School of Materials Science and Engineering Chongqing University of Technology Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology Chongqing University of Technology Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong University

advanced characterization techniques are utilized to investigate the effect of laser surface treatment on microstructural evolution of pure titanium（Ti）.The results show that there are three distinctly different types of microstructure from surface to substrate in Ti samples,including phase transformation and solidification microstructure in zone I（melting zone）;insufficient recrystallization grains with residual a martensitic plates in zone II（heat-affected zone,HAZ）;fully recrystallization microstructure in zone III（base metal,BM）.The hardness evolution profiles under different laser treatment parameters are *** highest hardness in MZ is ascribed to α plate,while the lowest hardness value in HAZ is due to the insufficiently recrystallized *** metallurgical process on the laser-modified Ti samples is systematically discussed in this work.

关键词： Laser surface treatment Microstructure characterization Titanium

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Control characteristics of D + A combined multi-pump controlled system

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High technology Letters 2018年第3期24卷 303-312页

作者：姚静 Wang Pei Cao Xiaoming Zhang Yang Kong Xiangdong College of Mechanical Engineering Yanshan University The Laboratory of Heavy Machinery Fluid Power Transmission and Control in Hebei Yanshan University National and Local Joint Engineering Center for Advanced Forging Press Forming Technology and Equipment Faculty of Engineering Yanshan University

In order to solve the flow mismatch problem between pumping source output and workload demand,a novel configuration of D + A combined multi-pump controlled hydraulic system,similar to a pump-controlled system,is proposed for a large power hydraulic system in this study. This novel configuration consists of several parallel fixed displacement pumps of different sizes and proportional variable displacement pumps,which is controlled by digital signal( on/off) and analog signal respectively( D + A pumps). The system flow is divided into two parts,one is the total flow from fixed displacement pumps,and the other is the rest desired flow supplied by variable displacement pumps to smooth and improve the demand flow. First,basic design principles and evaluation indicators of the proposed system are introduced. Then,a flow state matrix of the binary-coding digital pumps( 1: 2: 4) is obtained to provide the control signals of pumps. Experimental results show that the system output flow tracks well with acceptable flow deviation,though a little lag behind input signal.

关键词： multi-pump design principles flow state matrix evaluation indicator energy saving

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Modeling and Microstructure Analysis of Three-Dimension Direct Writing for Zn-Al Alloy

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IOP Conference Series: Earth and Environmental Science 2021年第3期769卷

作者： Wenjuan Rong Zhongde Shan Jialin Wang Yongwei Wang China Academy of Machinery Science and Technology Group Co. Ltd Beijing China State Key Laboratory of Advanced Forming Technology and Equipment Beijing China University of Science and Technology Beijing Beijing China

This paper presents a systematic numerical experimental investigation of single-track forming of 3D metal melting direct writing. A forming track width was fitted by multivariate nonlinear regression method, and the numerical model had a fair level of uniformity with the experiment results. Two phase flow model based on volume-of-fluid (VOF) method was adapted to build up the coupled calculative models for direct writing deposition and solidification. The results show that when the forming track width approximately equals to the solidification layer width, it is the optimum time for forming the next layer. Based on the above research, the pre-remelting time was proposed, which is helpful to create next layer forming quality, and could also be used to guide the creation of a proper default of process parameters.

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Multicomponent Entropy-Stabilized Zirconates with Comprehensive Properties for advanced Thermal Barrier Coating

SSRN

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SSRN 2019年

作者： Ren, Ke Wang, Qiankun Shao, Gang Zhao, Xiaofeng Wang, Yiguang Institute of Advanced Structure Technology Henan Province Industrial Technology Research Institute of Resources and Materials Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming

Thermal barrier coating materials, commonly ceramics, are deposited on superalloy surfaces to improve their service temperature. However, the intrinsic brittleness and low thermal expansion coefficient of ceramic materials pose a great challenge to developing new materials to replace yttria-stabilized zirconia. Herein, entropy engineering is employed to fabricate multicomponent rare earth zirconates with a large thermal expansion coefficient, excellent mechanical properties and ultralow thermal conductivity, without sacrificing other properties. This work provides a new insight into developing novel ceramics with a combination of mechanical and thermophysical properties, which would be significant in material development for thermal barrier coatings, thermoelectric fields, etc. © 2019, The Authors. All rights reserved.

关键词： Thermal barrier coatings

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The study and engineering application on adaptive leveling of vehicle platform 7

The study and engineering application on adaptive leveling o...

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7th International Conference on Advances in Construction Machinery and Vehicle Engineering, ICACMVE 2019

作者： Wang, Jianjun Zhao, Jingyi Li, Wenlei Cai, Wei Wang, Yongchang Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan University Qmhuangdao Hebei066004 China Department of Mechanical Engineering Anhm Technical College of Mechanical and Electrical Engineering Wuhu Anhui241002 China Key Laboratory of Advanced Forging & Stamping Technology and Science Qmhuangdao Hebei066004 China College of Mechanical Engineering Yanshan University Qmhuangdao Hebei066004 China Hebei Key Laboratory of Special Delivery Equipment Qmhuangdao Hebei066004 China

ISBN: (纸本)9781728139050

Leveling control of bearing platform of large engineering transport vehicle is very important for the safety and reliability of transportation. The leveling method of the load-bearing platform of the transporter is studied. According to the actual working conditions, through the force analysis of the load-bearing platform and the calculation method of the load center of gravity, the allowable loading area for the anti-overturning of the engineering transporter under the condition of four-point support is put forward. An adaptive electro-hydraulic leveling system based on four-point support is designed, and four groups of suspension hydraulic system are simplified as a single-support system model. The hydraulic system is built by AMESim software, and the control system is built by MATLAB software, Then the feasibility of the leveling control system is verified through the simulation. The results show that the control strategy has better precision and shorter reaction time, and is more suitable for vehicle leveling control system. On this basis, And the electro-hydraulic leveling control system was designed for the 100 tons of hydraulic truck of an enterprise, double-axis tilt sensor is used to monitor the level of the platform in real time, and the controller can make the suspension hydraulic cylinders act accordingly to keep the platform level. Finally, the actual vehicle leveling experiment is carried out, and the experiments of load sharing and unbalanced load lifting are carried out respectively. It is found that the leveling accuracy can be controlled within 0.25 degrees, which fully meets the engineering application and can provide reference for the development of similar systems. © 2019 IEEE.

关键词： MATLAB

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The Effect of Porosity on Mechanical Properties of Porous FeCrN Stainless Steel

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Journal of Physics: Conference Series 2021年第1期2044卷

作者： Weipeng Zhang Liejun Li Jixiang Gao Jiming Huang Xinkui Zhang Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials South China University of Technology Guangzhou 510640 China Guangdong Polytechnic Normal University Guangzhou 510635 China

Porous FeCrN stainless steel has excellent corrosion resistance, biocompatibility and mechanical properties matching human bone because of non-nickel and manganese, which is a new direction of medical implants. In this paper, FeCrN stainless steel with porosity of 28.21%-60.16% was prepared by powder metallurgy method. The microstructure, pore morphology and mechanical properties of porous stainless steel were analyzed by means of XRD, SEM, EDS and compression test. The microstructure of porous stainless steel is mostly austenite + ferrite. With the increase of porosity, the compressive yield strength, compressive strength and elastic modulus of the material decrease.

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Effects ofphysical parameters ofmultiphase flow on fire water monitor based on FLUENT

Effects ofphysical parameters ofmultiphase flow on fire wate...

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CSAA/IET International Conference on Aircraft Utility Systems, AUS 2018

作者： Yuan, Xiaoming Zhao, Shiyi Wang, Chu Zhang, Lijie Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University Qinhuangdao China

ISBN: (纸本)9781785617911

To improve the jet performance of a fire water monitor, the monitor head with three different inner contour lines were designed. Based on FLUENT, the calculation domain was defined geometrically and then the cloud pictures of the flow velocity, pressure, turbulence kinetic energy and multiphase flow of the fluid field in the nozzle and jet were obtained, based on which the optimal structure of each model can be selected. The simulation result can provide the theoretical reference for the design of a monitor head. © 2018 IET Conference Publications. All rights reserved.

关键词： Flow velocity

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A through process modeling using multi-assistant software applied to radial fatigue life predication of a 356-T6 wheels

Research Square

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Research Square 2020年

作者： Duan, Yong-Chuan Zhang, Fang-Fang Tian, Le Guan, Ying-Ping Hu, Jin-Hua Key Laboratory of Advanced Forming & Stamping Technology and Science Ministry of Education of China Yanshan University Hebei Qinhuangdao066004 China College of Mechanical Engineering Yanshan University Hebei Qinhuangdao066004 China Technical Center CITIC Dicastal Limited company Hebei Qinhuangdao066004 China

In order to solve the problem of isolated design in multi-process using multi-assistant software, a through-software radial fatigue life prediction model was established, the effects of shrinkage cavity, SDAS and mean stress on fatigue life were considered. The casting process of the aluminum alloy wheel was simulated based on ProCast, and the data of SDAS and porosity of different parts were predicted based on the solidification process;The data mapping algorithm between tetrahedral mesh elements was developed to realize the unidirectional transformation of microcosmic data from a cast model to a static mechanical model, the radial loading mechanical analysis model of a wheel containing microcosmic information was established;The fatigue life prediction model was established by Fesafe based on the specific mechanical and fatigue parameters of each node. Based on the self-developed TCD software, the integrated coupling method of the three software prediction models was realized. The application of this method on the virtual fatigue prediction experiment of unidirectional tensile specimen reduce the result dispersion between virtual and physical experiment, and the predicted life result error is reduced from 51% to 16%. The proposed method lays a solid foundation of the optimization design and lightweight design of aluminum alloy wheels. © 2020, CC BY.

关键词： Wheels

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