Acquisition method of target leveling height based on machine vision
作者：
Yin, Qiang;Gu, JiaXin;Song, Shaoyun;Zhang, Yonglin;Zhao, Gang;...
期刊：
CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE ,2023年35(3):e7513- ISSN：1532-0626
通讯作者：
Gu, JiaXin(1306480657@qq.com)
作者机构：
[Song, Shaoyun; Zhang, Yonglin; Gu, JiaXin; Yin, Qiang] Wuhan Polytech Univ, Sch Mech Engn, Wuhan, Peoples R China.;[Zhao, Gang] Wuhan Univ Sci & Technol, Hubei Key Lab Mech Transmiss & Mfg Engn, Wuhan, Peoples R China.;[Hao, ZhiQiang] Wuhan Univ Sci & Technol, Key Lab Met Equipment & Control Technol, Minist Educ, Wuhan, Peoples R China.;[Gu, JiaXin] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.
通讯机构：
[JiaXin Gu; JiaXin Gu JiaXin Gu JiaXin Gu] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
关键词：
grain leveling robot;image stitching;machine vision;target leveling height
摘要：
Grain leveling robot is a special equipment to realize grain surface leveling in granary. Whether the target height of grain leveling is clear or not has a great influence on the leveling effect and efficiency of grain surface. In this article, the deficiencies of existing grain leveling robots are summarized, and a method of obtaining target leveling height based on machine vision is proposed. Data were collected by RGB-D camera, the depth matrix of the whole large granary was obtained by image stitching and edge detection, and then the target height of the grain leveling robot was obtained by the element method. It solves the problem of controlling the falling height of the robot by human subjective feeling, improves the efficiency and precision of the robot, optimizes the effect of the robot, and helps to realize the intelligent work of the robot. © 2022 John Wiley & Sons, Ltd.
语种：
英文
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Anthocyanins/chitosan films doped by nano zinc oxide for active and intelligent packaging: comparison of anthocyanins source from purple tomato or black wolfberry
作者：
Li, Yana;Li, Zenghui;Wang, Yuwen;Sun, Liangbo;Pei, Houchang
期刊：
化学科学与工程前沿：英文版 ,2023年17(6):704-715 ISSN：2095-0179
通讯作者：
Li, Yana(myllyn@126.com)
作者机构：
[Li, Zenghui; Li, Yana; Pei, Houchang; Wang, Yuwen; Sun, Liangbo] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.
通讯机构：
[Yana Li] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
关键词：
bio-based;multifunction;colorimetric indicator;active and intelligent packaging
摘要：
The multifunctional films was prepared by blending chitosan and nano-ZnO with purple tomato anthocyanins or black wolfberry anthocyanins. The properties of films functioned by anthocyanins source and nano-ZnO content were studied. It was found purple tomato anthocyanins showed more significant color change against pH than black wolfberry anthocyanins. The nano-ZnO were widely dispersed in matrix and enhanced the compatibility of anthocyanins with chitosan. However, the anthocyanins source influenced the properties of the films more slightly than nano-ZnO addition. The tensile strength, antioxidant and antibacterial effects of the chitosan films dramatically increased after cooperated by nano-ZnO and anthocyanins, which also enhanced with increase of nano-ZnO content, whereas the elongation at break of the composite films decreased. Especially, the anthocyanin and nano-ZnO promoted the antibacterial activity of films synergistically. Composite films made from black wolfberry anthocyanins exhibited higher mechanical performance than those made from purple tomato anthocyanins but weaker antibacterial effects. The purple tomato anthocyanins/chitosan and nano-ZnO/purple tomato anthocyanins/chitosan films effectively reflected pork spoilage, changing their colors from dark green to brown, indicating the potential for applications in active and intelligent food packaging. [Figure not available: see fulltext.] © 2023, Higher Education Press.
语种：
英文
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Preparation and properties of P(IA-co-AA-co-AM) composite hydrogel via frontal polymerization
作者：
Li, Bin;Hao, Wenrui;Xu, Xiaojia;Liu, Jizhen;Fu, Dandan;...
期刊：
Colloid and Polymer Science ,2023年301(5):445-453 ISSN：0303-402X
通讯作者：
Li, Bin(libin_027@126.com)
作者机构：
[Xu, Xiaojia; Hu, Zhigang; Li, Bin; Hao, Wenrui; Fu, Dandan; Zhou, Mengjing] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.;[Liu, Jizhen] Wuhan Univ Technol, Sch Sci, Wuhan 430070, Hubei, Peoples R China.
通讯机构：
[Bin Li] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
关键词：
Frontal polymerization;Deep eutectic solvent;Itaconic acid;pH-sensitive hydrogel
摘要：
Choline chloride (ChCl) was used as the hydrogen bond acceptor (HBA) and acrylic acid (AA) and acrylamide (AM) as the hydrogen bond donor (HBD), and the three materials were mixed in a certain molar ratio to obtain deep eutectic solvent (DES). Subsequently, P(IA-co-AA-co-AM) composite hydrogels were prepared by adding itaconic acid (IA) to DES using the frontal polymerization (FP) method. The hydrogels were characterized by Fourier infrared spectroscopy (FTIR) and scanning electron microscopy (SEM), and the influence patterns of IA content on the mechanical properties, swelling properties, and pH responsiveness of the composite hydrogels were investigated. The results showed that the composite hydrogel exhibited a homogeneous porous structure. The elongation at the break of the composite hydrogel gradually increased with the increase of IA content, and the elongation of the FP4 sample reached 167%. The addition of IA increased the number of hydrophilic groups, resulting in a 2.14-fold increase in the equilibrium swelling of the composite hydrogel in distilled water. P(IA-co-AA-co-AM) composite hydrogels exhibit different swelling patterns in acidic and alkaline environments, making them promising for acid–base indicators, biosensors, and other applications. In this study, a simpler and greener method was proposed to prepare P(IA-co-AA-co-AM) composite hydrogels with pH responsiveness. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
语种：
英文
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薄壁3003铝合金管高频感应焊焊接接头微观组织及力学性能研究
作者：
肖述广;谢志雄;陈卓;陈琪;董仕节;...
期刊：
材料导报 ,2023年37(1):190-195 ISSN：1005-023X
通讯作者：
Xie, Zhixiong(xzx@hbut.edu.cn)
作者机构：
[肖述广; 谢志雄; 陈卓; 陈琪; 董仕节] Hubei Key Laboratory of Green Light Industrial Materials, Hubei University of Technology, Wuhan;430068, China;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan;430023, China;[Xie, Jianying] Wuhan Bojin New Materials Technology Co., Ltd., Wuhan
关键词：
铝合金;高频感应焊;焊接接头;显微组织;显微硬度
摘要：
采用高频感应焊接技术对壁厚为0.28 mm的3003铝合金进行焊接,研究了焊接接头的微观组织和力学性能。结果表明,焊接接头晶粒细小,是焊接过程中感应加热与挤压同步进行,局部晶粒发生塑性变形从而抑制了晶粒长大所致;焊接接头熔合区呈上下宽、中间窄的窄腰状,宽度为6 ~ 10 μm,熔融区呈细腰鼓形,单侧宽度为24 ~ 49 μm,其相邻两侧的热影响区部分发生再结晶,宽度为115 ~ 127 μm;断口形貌显示焊接接头断裂类型为以韧性断裂为主的韧脆混合型断裂,其抗拉强度为242 MPa,达到带材的91%,伸长率为15%,略低于带材(23%);焊接接头各区域硬度值呈M形对称分布,熔融区与热影响区硬度值明显高于母材区,熔融区最高,达到85.27HV,热影响区约为79.33HV,熔合区硬度值最低,为55.85HV。与母材相比,焊接接头强度和硬度分布规律与各区域晶粒大小和第二相种类及分布有关。
语种：
中文
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Vibration State Monitoring of Mechanical Equipment Based on Wireless Sensor Network Technology
作者：
Peng, Yuhua;Wang, Ying;Raffik, R.;Jagota, Vishal;Bhatia, Komal Kumar;...
期刊：
Electrica ,2022年22(3):428-437 ISSN：2619-9831
通讯作者：
Jagota, Vishal(vishaljagota@mits.ac.in)
作者机构：
[Peng, Yuhua] Wuchang University of Technology, Artificial Intelligence School, HuBei, China;[Wang, Ying] School of Mechanical Engineering, Wuhan Polytechnic University, HuBei, China;[Raffik, R.] Department of Mechatronics Engineering, Kumaraguru College of Technology, Tamilnadu, Coimbatore, India;[Jagota, Vishal] Department of Mechanical Engineering, Madanapalle Institute of Technology & Science, AP, Madanapalle, India;[Bhatia, Komal Kumar] Department of Computer Engineering, J.C. Bose University of Science & Technology, Ertwhile YMCA University of Science & Technology, Haryana, Faridabad, India
摘要：
In recent years, my country's smart grid has developed rapidly and is safe and stable operation of the power grid system; it is related to the healthy development of the national economy and stable life of the people. Most of the current vibration monitoring systems use wired ICP piezoelectric acceleration sensors to collect the vibration of the transformer tank wall, on-site live monitoring, and safety, but there are many inconveniences and problems. The author designed a vibration-sensing element based on the latest Micro-electromechanical systems (MEMS), a vibration sensor for wireless communication with ZigBee, applied in the online monitoring of a 110 kV three-phase power transformer in operation, and adopted wired and wireless sensor modes, respectively, to monitor and compare waveforms. The wired sensor used in the test is an ICP sensor, and its sensitivity is 500 mV/g. It can be used in a multi-vibration measuring point wireless network to monitor the surface vibration of the power transformer tank. In the waveform graph collected by wireless sensor, it can be observed that the waveform presents a periodic law, and it can be observed from the spectrogram that the energy is concentrated on the frequency multiplier of 50 Hz, which conforms to the vibration law of the transformer. © 2022 Istanbul University. All rights reserved.
语种：
英文
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Performance of elemental mercury removal by activated char prepared from high-chlorine Turpan-Hami coal
作者：
Wang, Zean;Huang, Pu;Xie, Yihao;Ning, Jian;Tu, Yaojie;...
期刊：
Fuel ,2022年307:121817 ISSN：0016-2361
通讯作者：
Liu, Hao
作者机构：
[Wang, Zean] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430048, Peoples R China.;[Liu, Hao; Tu, Yaojie; Ning, Jian; Xie, Yihao; Wang, Zean; Yu, Dunxi; Huang, Pu] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, State Key Lab Coal Combust, Wuhan 430074, Peoples R China.;[Liu, Hao] 1037 Luoyu Rd, Wuhan 430074, Peoples R China.
通讯机构：
[Liu, Hao] 1;1037 Luoyu Rd, Wuhan 430074, Peoples R China.
关键词：
Activated char;Chlorine transformation;Coal pyrolysis;Hg removal;High-chlorine coal
摘要：
This paper provides a new thought that a cost-effective chlorine-rich carbon-based sorbent could be prepared by directly pyrolyzing high chlorine coal in order to capture the elemental mercury, simultaneously realizing value-added utilization of the remained char instead of combustion during low rank coal pyrolysis poly-generation. In this work, the concentration and forms of chlorine in one kind of Turpan-Hami coal were determined quantitatively according to the proposed procedures. Then the release behavior of chlorine and the transformation of chlorine from inorganic state to organic were investigated during coal pyrolysis from 400 to 1000 °C. Moreover, the Hg0 removal performance was examined in a lab-scale fixed bed reactor by the char before and after CO2 activation. The results indicate that over 90 % of chlorine in raw coal is inorganic in the forms of ionic Cl and crystal NaCl, and ionic Cl can be transformed to inorganic NaCl and organic C-Cl species during coal pyrolysis, thus providing chlorine active adsorption sites for Hg0 chemisorption based on the results of temperature programmed desorption and adsorption kinetic analysis. Furthermore, CO2 activation can improve the char porosity and specific surface area, thus promoting the external mass transfer of Hg0 by increasing the opportunity of chlorine active sites being exposed to vapor Hg0. 100 % of Hg0 removal efficiency is achieved in the first hour and equilibrium adsorption amount is 400 ug/g for the activated char obtained by pyrolyzing coal at 600 °C combining with CO2 activation at 900 °C, indicating the good Hg0 removal performance of the as-obtained chlorinated activated char. © 2021 Elsevier Ltd
语种：
英文
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船体壳板撞击破裂后撕裂特征试验和数值模拟研究
作者：
张敏;张祥;赵延杰;张伦平
期刊：
船舶力学 ,2022年26(8):1171-1179 ISSN：1007-7294
通讯作者：
Zhang, Min(zhang.min1989.ok@163.com)
作者机构：
[张敏] College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan;430048, China;[张祥] The First Construction Company, CCCC Second Harbor Engineering Co., Ltd., Wuhan;430012, China;[赵延杰; 张伦平] China Ship Scientific Research Center, Wuxi
通讯机构：
[Zhang, M.] C;College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
关键词：
船舶碰撞;船体壳板;面外撕裂;模型试验;数值模拟
摘要：
为了研究船体壳板撞击破裂后的撕裂特征,开展了变截面撞头准静态压载船体壳板的模型试验和数值模拟。试验记录了壳板变形、破裂和撕裂过程的损伤模式及其完整损伤过程的撞击力-撞深曲线。通过拉伸试验校核,提出了模拟壳板初始破裂和撕裂失效的数值模拟方法。试验和数值模拟结果的对比分析表明:所提数值模拟方法能准确模拟壳板的完整损伤过程;壳板撕裂失效是由裂纹尖端的拉伸作用引起的,且撕裂过程的撞击力与裂纹数目无关;壳板撕裂过程的弯曲和拉伸作用所吸收的能量较大。本文研究工作对船体结构的耐撞性准确评估具有一定指导作用。
语种：
中文
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Research on deposition particles carrying with washing tools during well cleaning
作者：
Yang, Liu;Li, Yu;Wang, Deguo;Guo, Yanbao;Li, Dongyang
期刊：
Journal of Petroleum Science and Engineering ,2022年219:111097 ISSN：0920-4105
通讯作者：
Yang, Liu(yangliuvictry@163.com);Guo, Yanbao(gyb@cup.edu.cn)
作者机构：
[Li, Yu; Yang, Liu] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.;[Guo, Yanbao; Wang, Deguo; Yang, Liu] China Univ Petr, Coll Mech & Transportat Engn, Beijing 102249, Peoples R China.;[Guo, Yanbao; Wang, Deguo] Beijing Key Lab Proc Fluid Filtrat & Separat, Beijing 102249, Peoples R China.;[Li, Dongyang; Yang, Liu] Univ Alberta, Coll Chem & Mat Engn, Edmonton, AB T6G 1H9, Canada.
通讯机构：
[Liu Yang] S;[Yanbao Guo] C;College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, 102249, China<&wdkj&>Beijing Key Laboratory of Process Fluid Filtration and Separation, Beijing, 102249, China<&wdkj&>School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, China<&wdkj&>College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, 102249, China<&wdkj&>College of Chemical and Materials Engineering, University of Alberta, T6G 1H9, Edmonton, Alberta, Canada
关键词：
Wellbore cleanout;Washing tool;Particles transport;Horizontal well;Numerical analysis
摘要：
Continuous particles settling in horizontal wellbore section easily causes blocking during exploitation. Deposition particles cleaning behavior with washing tools has become a research focus in horizontal well during exploitation, due to the lower cleaning ability of conventional annular flow. Washing tools with different structures were researched using computational fluid dynamics (CFD) of k-Ε turbulent model and Eulerian-Eulerian multiphase flow model. Influences of working nozzle number, nozzle turning angle, size, rotation speed were studied. The results show that the annular flow field with washing tool can be divided into four velocity distribution zones, maximum velocity exists in slow decreasing zone close to outer wall. Increasing C nozzles number has a positive effect on velocity distribution close to outer wall. The particles deposition washing process can be divided into first fast carrying and then slow carrying in far position for reduction function with distance to washing tool. © 2022 Elsevier B.V.
语种：
英文
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Triangular Micro-Grating via Femtosecond Laser Direct Writing toward High-Performance Polarization-Sensitive Perovskite Photodetectors
作者：
Tian, Xiaoyu;Wang, Ruonan;Xu, Yalun;Lin, Qianqian;Cao, Qiang
期刊：
Advanced Optical Materials ,2022年10(19):2200856- ISSN：2195-1071
通讯作者：
Cao, Qiang(caoqiang@whu.edu.cn);Lin, Qianqian(q.lin@whu.edu.cn)
作者机构：
[Tian, Xiaoyu] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430048, Peoples R China.;[Cao, Qiang; Wang, Ruonan] Wuhan Univ, Inst Technol Sci, Wuhan 430072, Peoples R China.;[Lin, Qianqian; Xu, Yalun] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China.;[Lin, Qianqian; Xu, Yalun] Wuhan Univ, Suzhou Inst, Suzhou 255123, Peoples R China.
通讯机构：
[Qianqian Lin] S;[Qiang Cao] T;The Institute of Technological Sciences, Wuhan University, Wuhan, 430072 China<&wdkj&>School of Physics and Technology, Wuhan University, Wuhan, 430072 China<&wdkj&>Suzhou Institute of Wuhan University, Suzhou, 255123 China
关键词：
femtosecond laser direct writing;micro-grating;perovskite photodetectors;thermal co-evaporation
摘要：
Thanks to attractive properties, such as defect tolerance, broad bandgap tunability, high quantum yields, andlarge absorption coefficient, perovskites have emerged as a star material in the past decade. Meanwhile, optical nano/microstructures made of perovskites offer a facile and efficient strategy to improve light-harvesting performance and sensitivity of polarization. However, there is no low-cost, high-accuracy, and reproducibility technique for large-scale fabrication of perovskite nano/microstructures. Here, femtosecond laser direct writing technique is introduced to fabricate FAPbI3 perovskite micro-grating. Based on precise spatial and power control of femtosecond laser, micro-grating with different structure parameters (period and depth) can be processed and investigated. Triangular micro-grating of perovskite exhibits excellent emission properties (up to 67 times enhancement) owing to low reflectance and high absorption intensity. Strikingly, the outstanding performance of perovskite triangle grating photodetectors is obtained. The responsivity and detectivity reach 11.7 A W−1 and 7.8 × 1012 Jones, which are ≈3 and 12 times larger than the control devices; they also exhibit lower noise and decent polarization sensitivity. Taking the advantages of low cost, high accuracy, and reproducibility, the femtosecond laser direct writing technique endows perovskite materials with micro-photonic concept and remarkably enhances the devices’ performance. © 2022 Wiley-VCH GmbH.
语种：
英文
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Effects of aluminum on micro-sized pore structure of porous MoAlB ceramics fabricated via reactive synthesis
作者：
Yang, Junsheng;Wen, Yi;Zou, Haoran;Fan, Yiquan;Zhang, Chuo;...
期刊：
Ceramics International ,2022年48(10):14151-14155 ISSN：0272-8842
通讯作者：
Yang, Junsheng(yangjunsheng2008@163.com);Wen, Yi(wy1051600673@163.com)
作者机构：
[Xiong, Lieqiang; Fan, Yiquan; Zou, Haoran; Zhang, Chuo; Yang, Junsheng; Zhang, Kaisong; Wen, Yi] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Junsheng Yang; Yi Wen] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, Hubei, China
关键词：
Ceramic;Phase constitution;Pore forming mechanism;Porosity
摘要：
By using mixtures of Mo, Al and B powders with a molar ratio of 1/n/1 (n, 1.4–1.9 in 0.1 increments), porous MoAlB ceramic was successfully synthesized thorough activation reaction technology. The effects of aluminum content on phase transformation, volume expansion, microstructure and pore structure parameters (including pore size, porosity and permeability) were investigated systematically. With an increasement of Al content from 1.4 to 1.9, the open porosity reveals a trend of slowly increasing first and then the increment of growth rate. Meanwhile, the volume expansion, pore size and permeability show a similar trend with the open porosity. The reasons for these pore structure parameters alteration evolution are thoroughly explored. The pore forming mechanism is also investigated. © 2022 Elsevier Ltd and Techna Group S.r.l.
语种：
英文
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Effects of Cr content on the corrosion behaviour of porous Ni-Cr-Mo-Cu alloys
作者：
Li, Xide;Yang, Junsheng;Hu, Yangdon;Zou, Haoran;Zhang, Chuo;...
期刊：
Corrosion Engineering Science and Technology ,2021年56(6):594-603 ISSN：1478-422X
通讯作者：
Yang, Junsheng(yangjunsheng2008@163.com)
作者机构：
[Xiong, Lieqiang; Zou, Haoran; Ye, Jianping; Zhang, Chuo; Li, Xide; Yang, Junsheng; Hu, Yangdon; Liu, Yuzuo] Wuhan Polytech Univ, Sch Mech Engn, Wuhan, Peoples R China.
通讯机构：
[Junsheng Yang] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, People’s Republic of China
关键词：
Porous Ni–Cr–Mo–Cu alloys;corrosion resistance;corrosion behaviour;weight loss;electrochemical tests
摘要：
The porous Ni-Cr-Mo-Cu alloys were fabricated by an activation reaction sintering technique. The effects of Cr content varied from 10 to 30 wt-% on the corrosion performance of porous alloys in 10 wt-% H2SO4 solution were evaluated using weight-loss method and electrochemical techniques. The structural morphology, phase constitution and elemental distribution were characterized by scanning electron microscopy (SEM), X-Ray diffraction analysis, energy dispersive spectrometer and X-ray photoelectron spectroscopy (XPS). The results indicate that porous Ni-Cr-Mo-Cu alloys possess excellent corrosion performance. With incremental changes in Cr contents, the anticorrosion ability increases as well. Electrochemical measurements illustrate results similar to that of weight-loss method, with the increment of Cr content, the double capacitive loops for the porous alloy increases as well, which illustrate that the corrosion procedure is controllable by electrochemical reaction. Moreover, the charge transfer resistance of Ni30wt-%Cr10wt-%Mo5wt-%Cu is 49.2 times bigger than that of Ni10wt-%Cr10wt-%Mo5wt-%Cu. And the corrosion mechanism was explored by XPS.
语种：
英文
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The role of Al in the reactive synthesis of porous Mo2Ti2AlC3 ceramics
作者：
Zou, Haoran;Chen, Junxiao;Li, Xide;Wen, Yi;Fan, Yiquan;...
期刊：
Ceramics International ,2021年47(23):33330-33337 ISSN：0272-8842
通讯作者：
Yang, Junsheng
作者机构：
[Xiong, Lieqiang; Fan, Yiquan; Zou, Haoran; Li, Xide; Yang, Junsheng; Wen, Yi; Liu, Yuzuo] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.;[Chen, Junxiao] Hubei Univ Arts & Sci, Xiangyang 441053, Hubei, Peoples R China.
通讯机构：
[Yang, Junsheng] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
关键词：
Mo2Ti2AlC3;Sintering;Porous;Reactive synthesis;Ceramics
摘要：
The mixed powders of TiH2, molybdenum, aluminum and graphite with molar ratios of 2/2/n/2.85 (n ranges from 1.0 to 1.4 mol with an interval of 0.1 mol) were used as raw material powders for this work, and a novel porous Mo2Ti2AlC3 was synthesized via reactive synthesis. Through systematic research on the pore structure parameters of porous Mo2Ti2AlC3 prepared with different aluminum content, the results show that there is a clear correlation between the aluminum content and the pore structure parameters. With the aluminum content rising from 1.0 to 1.2 mol, the viscous permeability coefficient and pore size decreased, while the porosity increased; When the aluminum content increased from 1.2 to 1.4 mol, the pore structure parameters of porous Mo2Ti2AlC3 displayed an opposite trend. The reasons for the evolution laws of these pore structure parameters were also discussed in depth. In addition, the pore structure forming mechanism of porous Mo2Ti2AlC3 ceramics during the activation reaction sintering process has been explored. This work can provide an important reference for the subsequent preparation of quaternary porous MAX phase ceramics.
语种：
英文
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Reactive synthesis for porous TiVAlC ceramics by TiH2,V, Al and graphite powders
作者：
Zou, Haoran;Li, Xide;Zhang, Chuo;Wen, Yi;Fan, Yiquan;...
期刊：
Ceramics International ,2021年47(20):28288-28295 ISSN：0272-8842
通讯作者：
Yang, Junsheng(yangjunsheng2008@163.com)
作者机构：
[Xiong, Lieqiang; Zheng, Xiao; Fan, Yiquan; Zou, Haoran; Zhang, Chuo; Li, Xide; Yang, Junsheng; Wen, Yi; Liu, Yuzuo] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Junsheng Yang] S;School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, 430023, Hubei, China
关键词：
Ceramics;Pore size;Porosity;Pore forming mechanism
摘要：
Using the mixed powder of TiH2, graphite, aluminum and vanadium as starting materials, porous TiVAlC ceramics were fabricated by the reactive synthesis technology at 1300 °C. The chemical steadiness of porous TiVAlC along with the effects of sintering temperature on the viscous permeability coefficient, strength, porosity, pore size and volume expansion rate of the porous TiVAlC were explored, and the mechanism of pore formation was also revealed. The preparation process includes five steps as follows: (i) the complete decomposition of stearic acid at 500 °C; (ii) the pyrolysis of TiH2 at 700 °C, converting TiH2 into hydrogen and titanium (iii) The solid-liquid chemical reaction of solid vanadium, titanium and molten aluminum at 700 °C, converting the mixture into V–Al and Ti–Al compounds; (iv) At 900–1100 °C, Surplus V and Ti interact with graphite to synthesize carbides of TiVC2, VC, and TiC; (v) Reactive synthesized carbides (TiVC2, VC, and TiC), Ti2AlC, V–Al and Ti–Al compounds that yield porous TiVAlC at 1300 °C. © 2021 Elsevier Ltd and Techna Group S.r.l.
语种：
英文
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Effects of Al content on pore structures of porous TiVAlC ceramics by reactive synthesis
作者：
Zou, Haoran;Li, Xide;Zhang, Chuo;Li, Bin;Liu, Yuzuo;...
期刊：
Ceramics International ,2021年47(6):8338-8344 ISSN：0272-8842
通讯作者：
Yang, Junsheng
作者机构：
[Xiong, Lieqiang; Zheng, Xiao; Li, Bin; Zou, Haoran; Zhang, Chuo; Li, Xide; Yang, Junsheng; Yang, Xuejin; Liu, Yuzuo] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Yang, Junsheng] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
关键词：
Ceramics;Pore forming mechanism;Pore size;Porosity
摘要：
Porous TiVAlC ceramics were successfully prepared using mixed powders of TiH2, V, Al, and graphite with a molar ratio of 1/1/n/1 (n, 0.9–1.7 in 0.2 increments). Systematic experimental results showed the significant effects of Al content on the pore structure of these TiVAlC ceramics. With increased Al content, from 0.9 to 1.3 mol, pore sizes and viscous permeability coefficients of these materials gradually decreased and porosity showed an increasing tendency. As the Al content increased to 1.7 mol, the pore sizes, viscous permeability coefficients, and porosities all varied in the opposite direction. In addition, the reasons for these phenomena and the mechanism of pore forming in these ceramics were explored. The present study offered a significant reference for subsequent research into the fabrication of quaternary and multi-element porous alloys/ceramics. © 2020 Elsevier Ltd and Techna Group S.r.l.
语种：
英文
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Analytical and mathematical simulation for nonlinear stability of scale-dependent magneto-electro-elastic system
作者：
Li, Bin* ;Xu, Xiaojia;Hu, Zhigang;Liu, Yuzuo;Qi, Menghui;...
期刊：
Advances in Nano Research ,2021年11(4):393-403 ISSN：2287-237X
通讯作者：
Li, Bin
作者机构：
[Xu, Xiaojia; Hu, Zhigang; Li, Bin; Liu, Yuzuo] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.;[Zheng, Zengquan; Qi, Menghui; Liu, Yuzuo] Wuhan Univ Technol, Hubei Key Lab Theory & Applicat Adv Mat Mech, Wuhan 430070, Hubei, Peoples R China.
通讯机构：
[Li, Bin] W;Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Hubei, Peoples R China.
关键词：
classic shell theory;magneto-electro-elastic materials;nonlinear stability;smart material;strain gradient theory
摘要：
By using differential quadrature method (DQM), a numerical investigation was provided for nonlinear stability behavior of magneto-electro-elastic (MEE) cylindrical shells at microscale. It is assumed that the cylindrical shell has been subjected to compressive loads leading to buckling phenomena in geometrically nonlinear regime. The non-uniformity of strain field has been inserted in the formulation for considering the microscale effects. The material properties of the shell are considered to be inhomogeneous with graded distribution. After solving the governing equations using DQM, it is realized that if the nanoscale shell is subjected to electrical and magnetic fields, the post-buckling path may be changed with the value of electrical voltage and magnetic potential. Also, strain gradient effects have remarkable influence on post-buckling curves and critical voltages. © 2021 Techno-Press, Ltd.
语种：
英文
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Fabrication of graphene/copper nanocomposites via in-situ delamination of graphite in copper by accumulative roll-compositing
作者：
Chen, F.;Mei, Q. S.;Li, J. Y.;Li, C. L.;Wan, L.;...
期刊：
Composites Part B: Engineering ,2021年216:108850 ISSN：1359-8368
通讯作者：
Mei, Q.S.(qsmei@whu.edu.cn)
作者机构：
[Mei, Q. S.; Xu, T.; Chen, F.; Chen, Z. H.; Li, C. L.; Wang, Y. C.; Mei, X. M.; Wan, L.; Zhang, G. D.] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Peoples R China.;[Mei, Q. S.] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan 430072, Peoples R China.;[Li, J. Y.] Wuhan Polytech Univ, Sch Mech Engn, Wuhan 430023, Peoples R China.
通讯机构：
[Q.S. Mei] S;School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China<&wdkj&>Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan, 430072, China
关键词：
Accumulative roll-compositing;Electrical conductivity;Graphene/copper nanocomposites;In-situ delamination;Strengthening
摘要：
The application and performance of graphene-reinforced composites can be benefited from the easy fabrication of graphene and good dispersion of them in the matrix. Here we reported the fabrication of in-situ graphene/copper (Gr/Cu) nanocomposites by an accumulative roll-compositing (ARC) process featured by ultrahigh rolling cycles/strains. By sandwiching in copper sheets, commercial graphite foils can be effectively delaminated into few-layer graphene sheets by ARC, without the need of any additives or chemical treatments. The ARC-induced delamination of graphite was mediated by the shear-induced slip and debonding of graphitic planes, for which the critical stress/strain conditions were analyzed. The plastic-deformation-based method simultaneously enabled the uniform incorporation of the delaminated graphene sheets into Cu matrix. The as-produced bulk Gr/Cu nanocomposites exhibit an excellent combination of strength, ductility and electrical conductivity, with the maximum tensile strength of ~686 MPa and electrical conductivity above 70% IACS. Our study showed the high effectiveness of ARC processing for exfoliating graphite into graphene nanosheets, and the great potential for enhancing the contributions of graphene by improving their dispersion and bonding with the matrix. © 2021 Elsevier Ltd
语种：
英文
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Structure design and kinematics analysis of lower limb rehabilitation training robot
作者：
Hu, Ao;Yin, Qiang;Li, Qian;Yang, Hongjun;Zhang, Yonglin
作者机构：
[Hu, Ao; Yin, Qiang; Li, Qian; Yang, Hongjun; Zhang, Yonglin] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
会议名称：
3rd International Conference on E-Business, Information Management and Computer Science, EBIMCS 2020
会议时间：
December 5, 2020 - December 6, 2020
会议地点：
Wuhan, China
摘要：
In this article, a new type of lower limb rehabilitation training robot is designed and related rehabilitation training programs are proposed. The robot system uses a bionic lower limb movement mechanism to drive the hip and ankle joints of the human body, and is combined with a treadmill-type vertical vibration training device to simulate human walking for lower limb rehabilitation training. The overall structure is modeled in three dimensions. In addition, the simplified link mechanism model is used to analyze the robot's motion process by analytical methods, and the motion equations and motion parameters of each component are derived. Meanwhile, simulation software was used to simulate the motion speed of the thigh link and the calf link in the bionic lower limb motion mechanism, and the motion angle range of the hip and knee joints was also simulated. According to the simulation results, the rehabilitation training program is verified and revised to further optimize the design. It lays a theoretical foundation for the movement of the lower limb rehabilitation training robot in the future, and has certain research significance. © 2020 ACM.
语种：
英文
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Simulation of Separation of Rice Bran and Broken Rice in Top-suction Rice Mill with Annular Duct
作者：
Lizong, Wang;Nanhui, Yu;Jijun, Fan;Yonglin, Zhang;Houchang, Pei;...
作者机构：
[Lizong, Wang; Nanhui, Yu; Jijun, Fan; Yonglin, Zhang; Houchang, Pei; Yifan, Zhang] College of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
会议名称：
3rd International Conference on E-Business, Information Management and Computer Science, EBIMCS 2020
会议时间：
December 5, 2020 - December 6, 2020
会议地点：
Wuhan, China
摘要：
In view of the defect that the rice bran collected by the traditional rice milling machine will be mixed with broken rice, the top-suction rice mill with annular duct was designed to separate and collect the rice bran and broken rice in the annular duct. The DEM-CFD coupling simulation method and the sliding mesh method were used to simulate the movement of the motion of particles in the new rice mill. The results show that the fluid velocity in the annular duct is between the suspension velocity of rice bran and broken rice when the wind speed of the top suction outlet and the fan is 6 m/s and 10 m/s respectively. The rice bran floated up (the rising velocity is 1 ∼ 3 m/s) along the wall of the annular duct and was discharged from the top suction outlet under the updraft in the duct. Additionally, the partition can effectively prevent the rice bran from falling. The broken rice fell and was discharged from the bottom air inlet with the velocity of 1 m/s. The separation efficiency was 99.6%, which showed that the separation effect was excellent. © 2020 ACM.
语种：
英文
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Tribological behaviors of rice particle based on the moderate processing
作者：
Yang, Liu;Fan, Yuchao;Wang, Chenghao;Yang, Tengyu;Yan, Qinghua;...
作者机构：
[Yang, Liu; Fan, Yuchao; Wang, Chenghao; Yang, Tengyu; Yan, Qinghua; Song, Shaoyun] College of Mechanical Engineering, Wuhan Polytechnic University, China
会议名称：
3rd International Conference on E-Business, Information Management and Computer Science, EBIMCS 2020
会议时间：
December 5, 2020 - December 6, 2020
会议地点：
Wuhan, China
摘要：
During rice processing, the over milling process cause a lot of loss of rice grains, the research on the proper processing method of rice is crucially important. In order to study the tribological characteristics of brown rice under friction during rice milling, based on the principle of moderate processing, three kinds of brown rice were used as the research object, and the in-situ observation combined friction and wear tester was used to analyze the friction process of brown rice grains under load, rotate speed, rice temperature, humidity, and other factors. The results show that: The friction coefficient curve of brown rice is divided into three stages; The friction coefficient and the abrasion loss of brown rice increase with the increase of load and speed, and decrease with the increase of humidity and temperature of brown rice. © 2020 ACM.
语种：
英文
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Innovative Design of the Transplanter Seedling Transmission Mechanism Based on TRIZ Theory
作者：
Wang, Rui;Zou, Jiawei;Zhang, Heng
作者机构：
[Wang, Rui] Institute of Agricultural Mechanization, Wuhan Academy of Agricultural Sciences, Wuhan, China;[Zou, Jiawei; Zhang, Heng] School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan, China
会议名称：
3rd International Conference on E-Business, Information Management and Computer Science, EBIMCS 2020
会议时间：
December 5, 2020 - December 6, 2020
会议地点：
Wuhan, China
摘要：
In order to solve the poor flexibility of plant spacing change and the inconvenient operation of manual seedling for the pot seedling transplanter, the transmission mechanism innovation design affecting the working efficiency was carried out based on the TRIZ theory. Firstly, the technical conflict of transplanter is transformed into the engineering parameters which need to be improved in TRIZ theory. Then, the contradiction problems of functional transformation design for the transplanter were solved by using the inventive principle, function analysis, and contradiction matrix in TRIZ method. The plant spacing adjustment was realized through the introduction of multi-layer gear structure, the manual labor loss was improved by using a periodic rotation seedling wheel. Finally, the static and dynamic analysis of the planter was carried out by numerical method to investigate the feasibility of the design scheme. This method proposed can improve the operation efficiency, and provide reference for the innovation design of the transplanter. © 2020 ACM.
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英文
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