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作者： Guangming Li Congrui Zuo Yi Ma Qike Huang Department of Mechanical and Energy Engineering Shaoyang University Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang University Institute Of Thermal And Energy Metrology Hunan Institute Of Metrology And Test

Xiangtan geely automobile production base, the author of this paper wiper washing system failure occurs, the washing ball core fracture problem of the nozzle, combined with the actual production, based on product failure reason analysis, found the ball core fracture basic appear in the winter, the temperature decrease after the plastic shrinkage, the matching of the nozzle and the spool too tight, the user without the use of special debugging tools debug copper ball, caused the ball core fracture, for this reason, put forward to increase before initial washing nozzle spray Angle 6.5 o, and adjust the structure of the nozzle core ball, the ball core from square to V groove root, enhance the strength of ball core groove, using the method of 3 D modeling, According to former car washing nozzle design parameters, through the Pro/E 3 D software to complete before washing nozzle and improving design of 3 D model, using the finite element analysis of ANSYS Workbench before washing nozzle improvement before and after the deformation and stress distribution, the improved deformation from 0.0023643 mm to 0.0012954 mm, the improved maximum stress value from 472.87 MPa to 259.09 MPa, ultimate strength less than 300 MPa, improve the rationality of the design is verified, for enterprises to solve the quality problem, have a very good reference value.

关键词： Front washing nozzle Failure Improved design Finite element analysis

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Analysis and Research on Defrosting Ventilation Pipe Deformation of Automobile

Analysis and Research on Defrosting Ventilation Pipe Deforma...

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According to the market feedback, automobile defrosting ventilation pipe does not fit in the top 10 of xiangtan geely automobile market quality problems. According to the detection of vehicles in this condition, the reason for the deformation of automobile defrosting ventilation pipe position is that the gap between instrument cover and ventilation pipe is less than 4 mm. Ventilation tube ends around not level off, the present state of collapse, and the intensity of this state collapse is due to the lack of overall deformation, for deformation reasons of automobile ventilation pipe outlet increase 11 on the back of the improved design scheme of reinforcement, using the method of three-dimensional modeling, design parameters, according to auto defrost ventilation tube through the Pro/E 3 d software to complete the ventilation pipe before and after the improvement model, using ANSYS Workbench software of finite element analysis was carried out on the ventilation pipe before and after improvement, the maximum deformation analysis ventilation pipe outlet, After the improvement, the deformation amount decreased from 10.643 mm to 10.283 mm, and the maximum stress value of the ventilation pipe decreased from 85.783 MPa to 55.781 MPa, less than the ultimate strength of 70 MPa, verifying the rationality of the improved design, Solve the quality problem for the enterprise, have very good reference value.

关键词： Car defrosting ventilation pipe Deformation The finite element

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Ionic Liquid-Intercalated Montmorillonite Interfacial-Reinforced Polymer Composite Scaffold

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Journal of Nanomaterials 2023年第1期2023卷

作者： Li, Dongying Li, Pin Wang, Haoyu Du, Haocheng Liu, Lixuan Li, Bin Xu, Yong Li, Mengqi Zhou, Yanrong Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing College of Mechanical and Energy Engineering Shaoyang University Shaoyang422000 China Department of Otolaryngology Zhuhai People's Hospital Medical Group Guangdong Province Zhuhai519000 China

Montmorillonite is often used to enhance the mechanical and biological properties of polymer materials, but the weak interaction between the enhanced phase and the matrix limits the enhancement effect. Herein, ionic liquids were introduced as interfacial compatibilizer to improve the dispersion of the enhanced phase in the matrix and interaction between them, and a composite scaffold with enhanced mechanical properties was prepared by selective laser sintering. Specifically, the positively charged terminations of 1-n-butyl-3-methylimidazolium in ionic liquids were anchored to the montmorillonite interlayer domain under electrostatic action. At the same time, the long carbon chain at the other end extends in the opposite direction to increase the layer spacing of the montmorillonite, which provides enough space for the intercalation of the polyetheretherketone molecular chain. First, the blue shift of the diffraction peak in the small-angle X-ray diffraction pattern proves the successful insertion of ionic liquids into the interlayered domain of montmorillonite. In addition, the compression test results show that the compressive strength of the modified composite scaffold was increased by 23%, reaching 31.53 MPa. Besides, the composite scaffold exhibits good biomineralization capacity, which may be attributed to ion modification providing more apatite-shaped nucleation sites. These results suggested that the method of modifying inorganic fillers with ionic liquids to enhance mechanical properties and promote mineralization may be an effective means for bone scaffold modification. © 2023 Dongying Li et al.

关键词： Clay minerals

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Prediction of profile deviation during glass molding of double-aspheric lens

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Journal of Engineering Science and Technology Review 2020年第2期13卷 50-56页

作者： Kejun, Zhu Sheng, Shi Zhigang, Chen Zhihui, Liu Yingying, Zhang College of Mechanical and Energy Engineering Shaoyang University Shaoyang Hunan422000 China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang University Hunan422000 China College of Optical Sciences University of Arizona TucsonAZ85719 United States

Glass molding technology has attracted considerable attention because of its low cost and high-volume production. However, the profile deviation mechanism of double-aspheric lens is currently unclear. A method of profile deviation prediction was developed in this study to reveal the influence law of molding parameters on the profile deviation of upper and lower aspheric surfaces. Based on the thermoviscoelastic constitutive model and finite element theory, a method of profile deviation prediction for the glass molding of double-aspheric lens was established. Single-factor analysis method was used to analyse the influence law of glass molding parameters, such as molding temperature, molding velocity, annealing rate, and holding pressure on profile deviation. Different influence laws of each molding parameter on the profile deviation of the upper and lower aspheric surfaces were discussed. Results demonstrate that the profile deviation decreases with the increase when the molding temperature lower than 570 °C. When the molding temperature is above 570 °C, the profile deviation slowly increases with the increase of molding temperature, and the profile deviation of the double-aspheric lens increases with the increase in the pressing velocity. The profile deviation of the upper and lower aspheric surface decreases as the annealing rate and the holding pressure increase, and the profile deviation of the upper surface is greater than the lower. The difference can be reduced by increasing the holding pressure. This study provides a reference for improving the molding accuracy of double-aspheric lens. © 2020 School of Science, IHU.

关键词： Molding

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Two-stage glass molding of aspheric lens

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Journal of Engineering Science and Technology Review 2020年第2期13卷 57-62页

作者： Zhu, K.J. Shi, S. Chen, Z.G. Luo, B. Zhang, Y.Y. College of Mechanical and Energy Engineering Shaoyang University Shaoyang Hunan422000 China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang University Hunan422000 China College of Optical Sciences University of Arizona TucsonAZ85719 United States

The glass molding has recently emerged as a promising way to mass-produce aspheric lens but has low molding accuracy. This study proposed a novel two-stage glass molding technology on the basis of the best-fitting sphere theory to improve the molding accuracy of aspheric lenses. A method of profile deviation prediction for the two-stage glass molding of aspheric lens was established on the basis of the finite element theory. Moreover, the influence of the two-stage molding temperature on profile deviation was discussed. Finally, the proposed two-stage glass molding technology was compared with the traditional glass molding process. Results demonstrate that the radius of the best-fitting sphere is 3.313 mm by fitting through the least squares method. When the molding temperature in the first stage is higher than that of the second stage, the molding accuracy of the aspheric lens is improved. Compared with the method of one-stage glass molding, the method of two-stage glass molding decreases the maximum profile deviation of the aspheric surface from 1.32 μm to 0.83 μm. The service life of the aspheric mold is prolonged because most of the deformations required for glass molding are completed by the spherical mold. This study can provide references to improve the molding accuracy and reduce the production costs of the glass molding of aspheric lens. © 2020 School of Science, IHU.

关键词： Glass

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Research on A New Connection Mode of 10kV Medium Voltage Cable Intermediate Joint 8

Research on A New Connection Mode of 10kV Medium Voltage Cab...

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8th International Conference on Energy Materials and Electrical Engineering, ICEMEE 2022

作者： Liu, Bohan He, DaJiang Chen, Lingxi Shu, You Cai, Yaoxing Duan, Tao School of Physics Electronics and Intelligent Manufacturing Huaihua University Hunan Huaihua418000 China Huaihua University Hunan Huaihua418000 China Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Hunan Huaihua418000 China Academy of Fine Arts &art Instute Huaihua University Hunan Huaihua418000 China Preparation Technology of Polyvinyl Alcohol Fiber Materials Hunan Engineering Laboratory Hunan Huaihua418000 China State Grid Huaihua Power Supply Company Hunan Huaihua418000 China

ISBN: (纸本)9781510663220

Due to the on-site production of the middle joint of the cable, there are problems of loose contact, obvious heat generation and easy failure at the joint. In order to ensure the safe and stable operation of power cables and reduce the harm caused by the accidents of power cable intermediate joint to the power grid, this paper studies a preliminary design scheme of plug-in intermediate joint in view of the fact that there are many accessories of traditional power cable intermediate joint, the operation is cumbersome, and there are certain requirements for the technical level of installers. This scheme is easy to operate and requires less on-site process for operators. In this paper, a new connection mode of 10kV medium voltage cable intermediate joint is designed. The intermediate joint device is pre-made. the handle of the device is pulled open, the cable is inserted, and the connection is totally competed by closing the handle, which speeds up the recovery speed, improves the work efficiency, ensures the safe and stable operation of power cables, reduces the power system faults caused by the connection faults of intermediate cables, and provides a reliable guarantee for the safe operation of medium and low voltage distribution networks in China. © 2023 SPIE.

关键词： Electric power distribution

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Simulation of Combustion Flow of Methane Gas in a Premixed Low-Swirl Burner using a Partially Premixed Combustion Model

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Journal of Thermal Science 2022年第5期31卷 1663-1681页

作者： XIAO Caiyuan OMIDI Milad SURENDAR A. ALIZADEH As'ad BOKOV Dmitry O. BINYAMIN TOGHRAIE Davood Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang422000China College of Mechanical and Energy Engineering Shaoyang UniversityShaoyang422000China Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahr119/84175Iran Department of Pharmacology Saveetha dental College and hospitalSaveetha institute of medical and technical sciencesChennai602105India Faculty of Engineering Soran UniversitySoran651Iraq Department of Mechanical Engineering College of EngineeringUniversity of ZakhoZakho1653654Iraq Institute of Pharmacy Sechenov First Moscow State Medical UniversityMoscow119991Russian Federation Department of Mechanical Engineering Faculty of Science and TechnologyUniversitas Muhammadiyah Kalimantan TimurSamarinda75124Indonesia

Because the rotational current stabilizes the flame by creating a recirculation zone,it may increase the risk of *** this reason,low-spin combustion is used to stabilize the flame while preventing ***,in this study,the combustion flow of methane gas in a low-swirl burner is simulated using a partially premixed combustion ***,the fuel flow rate is considered *** research parameters include swirl angle(θ=35°–47°),equivalence ratio(φ=0.6–0.9)and inlet axial flow radius(R=0.6–0.7)and effect of these parameters on temperature distribution,flame length,flame rise length,velocity field,and streamlines of the number of pollutant species are *** contours of streamline,temperature distribution,and velocity distribution are also presented for analysis of flow *** results show that with increasing the fuel-air ratio,the strength of the axial flow decreases,and the position of the maximum flame temperature shifts toward the inlet of the *** results also reveal that by increasing the swirl angle of the flow,the position of the minimum velocity value(opposite to the direction of the axis)tends towards the *** results also indicate that the maximum temperature of the combustion chamber increases with increasing the swirl angle,and inθ=35°,the maximum temperature is 1711℃and inθ=41°,this value is 1812℃.Finally,by increasing the swirl angle toθ=47°,the maximum flame temperature position is found at a considerable distance from the inlet and is 1842℃.

关键词： swirl burner numerical simulation axial velocity premixed combustion V-shaped flame

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Effects of Soft Sparking on Micro/Nano Structure and Bioactive Components of Microarc Oxidation Coatings on Selective Laser Melted Ti6al4v Alloy

SSRN

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SSRN 2023年

作者： Wang, Xiao-Ming Zhang, Fu-Qin Powder Metallurgy Research Institute Central South University Changsha410083 China Department of Mechanical and Energy Engineering Shaoyang University Shaoyang422000 China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang University Shaoyang422000 China

We used the soft sparking mode to fabricate microarc oxidation coatings containing micro/nano-scale pores and bioactive Ca/P components on Ti6Al4V alloy samples formed by selective laser melting. The effect of soft sparking on the microstructure and corrosion resistance of the coatings and the codeposition mechanism of the electrolyte anions in the soft sparking layer were investigated using different negative/positive charge ratios. The results showed that the negative charge significantly decreased the discharge intensity during the secondary microarc discharge stage, resuling in the soft sparking phenomenon, which promotes the formation of a thin amorphous TiO2 layer at the barrier layer/substrate interface. In turn, this interface facilitated the electron tunneling and aggregation of the electrolyte anions, which leads to soft sparking at voltages significantly lower than the breakdown voltage of the anodic oxide film on the selective laser melted Ti alloys. Soft sparking promoted the codeposition of the electrolyte anions, including PO43- and Ca2+ ions, in the form of bulk amorphous phases at the soft sparking layer/primary layer interface. The soft sparking layer contained amorphous phases, which were corroded more readily than that the primary ceramic layer. However, the submicro/nano-scale pores in the soft sparking layer improved its corrosion resistance. With an increase in negative/positive charge ratio, the effect of soft sparking on the structure of the primary coating weakened, and the amounts of Ca and P codeposited in the soft sparking layer increased. Finally, the corrosion resistance of the coating was found to first increase and then decrease, reaching the maximum at the 1.1 ratio. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

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Enhancement of Strength and Elastic Modulus of Mg-Gd-Y-Zn-Zr Alloy by Sn Addition

SSRN

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SSRN 2022年

作者： Ding, Zhibing Zhi, Xuanle Liu, Bin Hou, Hua Zhang, Shuai Guo, Wenmin Chen, Dongrui Zhao, Yuhong College of Mechanical and Energy Engineering Shaoyang University Shaoyang422000 China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang University Shaoyang422000 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China College of Materials Science and Engineering North University of China Taiyuan030051 China

The effect of Sn addition on the microstructure and mechanical properties of Mg-12Gd-3Y-0.5Zn-0.6Zr (wt%) alloys was investigated. The results show that the microstructure of the as-cast Sn-containing alloys consists of α-Mg, Mg24(RE,Zn)5 and Sn3RE5 phases. The Sn3RE5 phases with superior high temperature stability increase with the Sn content. The Young’s modulus of Sn3Gd5 and Sn3Y5 compounds are 109.0GPa and 119.2GPa, respectively, which results in the elastic modulus of the alloys increasing with the Sn element. Mg-12Gd-3Y-0.5Zn-0.6Zr-2Sn alloy has the highest elastic modulus of 51.3GPa. The addition of Sn can significantly increase the number density of fine circular β′ phases in peak-aged alloys. Suitable volume fraction of Sn3RE5 phases, fine DRXed grains, weak basal texture and fine precipitates endow the peak-aged Mg-12Gd-3Y-0.5Zn-0.6Zr-1Sn alloy with excellent comprehensive performance, and its elastic modulus, UTS and YTS are 50.4GPa, 452MPa and 368MPa, respectively. © 2022, The Authors. All rights reserved.

关键词： Elastic moduli

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Enhancing Strength and Ductility of Mg-Gd-Zn Alloy by Trace Ti and Al Additions

SSRN

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SSRN 2022年

作者： Ding, Zhibing Zhang, Shuai Liu, Bin Hou, Hua Zhi, Xuanle Guo, Wenmin Chen, Dongrui Zhao, Yuhong College of Mechanical and Energy Engineering Shaoyang University Shaoyang422000 China Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing Shaoyang University Shaoyang422000 China State Key Lab of Powder Metallurgy Central South University Changsha410083 China College of Materials Science and Engineering North University of China Taiyuan030051 China

The effects of trace additions of Ti and Al on the microstructure and mechanical properties of Mg-Gd-Zn alloy were investigated. Trace Al addition can promote the generation of LPSO in Mg-Gd-Zn(-Ti) alloys. Trace Ti addition can not only effectively refine the microstructure of as-cast alloys, but also inhibit the growth of DRXed grains in as-rolled alloys. The maximum texture intensity of the as-rolled alloy is slightly weakened by the addition of trace Ti and Al. The aging hardening response can be improved by adding Ti, but decreased by adding Al. The fibrous 14H LPSO phases, refined DRXed grains, basal texture and fine precipitates endow the peaked-aged Mg-Gd-Zn-Al-Ti alloy with superior mechanical performance, its UTS, YTS and elongation are 486MPa, 402MPa and 8.7%, respectively. © 2022, The Authors. All rights reserved.

关键词： Gadolinium alloys

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