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Elastohydrodynamic Lubrication Performance of Curvilinear Cylindrical Gears Based on Finite Element Method

computer Modeling in Engineering & Sciences 2025年第2期142卷 1585-1609页

作者： Xuegang Zhang Yingjie Dong Xian Wei Ruiqi Wang Qi Zhang School of Intelligent manufacturing Panzhihua UniversityPanzhihua617000China Panzhihua Hangyu New Material Technology co. Ltd.Panzhihua617000China School of Intelligent manufacturing Chengdu Industrial Vocational Technical CollegeChengdu610218China

The fixed-setting face-milled curvilinear cylindrical gear features teeth that are arc-shaped along the longitudinal *** researchers hypothesize that this arc-tooth may enhance the lubrication conditions of the *** study focuses on this type of gear,employing both finite element analysis(FEA)and analytical methods to determine the input parameters required for elastohydrodynamic lubrication(EHL)*** effects of assembly errors,tooth surface modifications,load,and face-milling cutter radius on the lubrication performance of these gears are systematically *** finite element model(FEM)of the gear pair is utilized to calculate the coordinates of contact points on the tooth surface and the corresponding contact pressures at the tooth surface nodes throughout a meshing ***,the normal load on specific gear teeth is determined using a gradient-based *** speed,slip-to-roll ratio,and effective radius near the contact points on the tooth surface are derived through analytical *** data obtained from FEA serve as input parameters for EHL *** lubrication performance of the curvilinear cylindrical gear is evaluated through example *** findings indicate that using FEA to provide input parameters for EHL simulations can reveal the occurrence of edge contact phenomena during gear meshing,allowing for a more accurate representation of the gear’s lubrication *** lubrication performance of the curvilinear cylindrical gear is shown to be independent of the face-milling cutter radius but is significantly influenced by the size of the contact pattern on the tooth *** gears with larger contact patterns demonstrate superior lubrication performance.

关键词： FEM EHL curvilinear cylindrical gear lubrication performance analysis

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Application of Lattice Boltzmann Method to Simulate Forest Edge

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Advances in Applied Mathematics and Mechanics 2023年第2期15卷 376-401页

作者： Jie Wei Jianjun Wu An Jiang Kun Wan Key Laboratory of Mechanics on Disaster and Environment inWestern China Attached to the Ministry of Education of ChinaLanzhou UniversityLanzhouGansu 730000China college of Civil Engineering and Mechanics Lanzhou UniversityLanzhouGansu 730000China Shenzhen TenFong Technology co. LtdGuangdongChina zhongjiao tianhe machinery equipment manufacturing co.ltd SuzhouJiangsuChina

This study is focused on the forest edge flow by using numerical *** model the effects of a forest canopy on airflow,source terms are introduced into the governing *** lattice Boltzmann method in conjunction with the standard k-εmodel is applied to solve the turbulent wind *** order to perform the simulation on non-uniform grids,the Taylor series expansion and least square based lattice Boltzmann method(TLLBM)is adopted to improve the accuracy and computational *** present method and code are verified with an earlier forest edge simulation.A series of forest canopies are established to explore the impacts of canopy morphology on wind *** canopies cover 3 canopy architectures and the Leaf Area Index(LAI)ranges from 2.0 to *** further study is carried out by adjusting the canopy foliage amount and the canopy *** present study demonstrates the potential of lattice Boltzmann method to simulate the high Re number forest edge *** impacts of canopy morphology on zero plane displacement,aerodynamic roughness length,friction wind velocity,permeability coefficient,wall-shear stress are illustrated in *** results show that the canopy sub-layer wind field,especially the wind velocity profiles within and above the forest canopy,are mainly determined by canopy morphology.

关键词： Forest edge lattice Boltzmann method non-uniform grids canopy morphology

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Bio-inspired Leg Design for a Heavy-Duty Hexapod Robot

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Journal of Bionic Engineering 2022年第4期19卷 975-990页

作者： Haoyuan Yi Zhenyu Xu Xueting Xin Liming Zhou Xin Luo State Key Laboratory of Digital manufacturing equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Research Institute Inner Mongolia First Machinery Group Co.LtdBaotou 014030China

The leg structure is crucial to the legged robot's motion *** the size and load of the legged robot increasing,the difficulty of leg design increases *** by biomechanics,this paper proposes a leg design approach based on effective mechanical advantage(EMA)for developing the heavy-duty legged *** bio-inspired design approach can reduce the demand for joint actuation forces during walking by optimizing the ratio relationship between the joint driving force and ground contact force.A dimensionless EMA model of the leg for the heavy-duty legged robot is constructed in this *** dimensions and hinge point locations are optimized according to the EMA and energy-optimal *** on the optimal leg structure,an electrically driven tri-segmented leg prototype is *** leg's joint hinge points are located near the main support line,and the load-to-weight ratio is 15:*** leg can realize a swing frequency of 0.63 Hz at the stride length of 0.8 m,and the maximum stride length can reach 1.5 m.

关键词： Legged robot EMA Heavy-duty Bio-inspired

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Design a Hybrid Energy-Supply for the Electrically Driven Heavy-Duty Hexapod Vehicle

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Journal of Bionic Engineering 2023年第4期20卷 1434-1448页

作者： Zhenyu Xu Haoyuan Yi Dan Liu Ru Zhang Xin Luo State Key Laboratory of Digital manufacturing equipment and Technology Huazhong University of Science and TechnologyWuhan430074China Research Institute Inner Mongolia First Machinery Group Co.LtdBaotou014030China

Increasing the power density and overload capability of the energy-supply units(ESUs)is always one of the most challenging tasks in developing and deploying legged vehicles,especially for heavy-duty legged vehicles,in which significant power fluctuations in energy supply exist with peak power several times surpassing the average *** ESUs with high power density and high overload can compactly ensure fluctuating power source supply on *** can avoid the ultra-high configuration issue,which usually exists in the conventional lithium-ion battery-based or engine-generator-based ***,it dramatically reduces weight and significantly increases the loading and endurance capabilities of the legged *** this paper,we present a hybrid energy-supply unit for a heavy-duty legged vehicle combining the discharge characteristics of lithium-ion batteries and peak energy release/absorption characteristics of supercapacitors to adapt the ESU to high overload power *** parameters of the lithium-ion battery pack and supercapacitor pack inside the ESU are optimally matched using the genetic algorithm based on the energy consumption model of the heavy-duty legged *** experiment results exhibit that the legged vehicle with a weight of 4.2 tons can walk at the speed of 5 km/h in a tripod gait under a reduction of 35.39%in weight of the ESU compared to the conventional lithium-ion battery-based solution.

关键词： Heavy-duty legged vehicles Hybrid energy-supply unit Power fluctuation Optimal matching of lithium-ion battery pack and supercapacitor pack

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Blade Segment with a 3D Lattice of Diamond Grits Fabricated via an Additive manufacturing Process

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Chinese Journal of Mechanical Engineering 2020年第5期33卷 185-196页

作者： Bin Chen Peng Chen Yongjun Huang Xiangxi Xu Yibo Liu Shuangxi Wang Intelligent manufacturing Key Laboratory of Education Department of ChinaCollege of EngineeringShantou UniversityShantou 515063China Shantou Yuexi machinery equipment co.ltd Shantou 515000China Advanced Technology&Materials co. LtdBeijing 100081China

Diamond tools with orderly arrangements of diamond grits have drawn considerable attention in the machining field owing to their outstanding advantages of high sharpness and long service *** diamond super tool,as well as the manufacturing equipment,has been unavailable to Chinese enterprises for a long time due to *** this paper,a diamond blade segment with a 3D lattice of diamond grits was additively manufactured using a new type of cold pressing equipment(AME100).The equipment,designed with a rotary working platform and 16 molding stations,can be used to additively manufacture segments with diamond grits arranged in an orderly fashion,layer by layer;under this additive manufacturing process,at least 216000 pcs of diamond green segments with five orderly arranged grit layers can be produced per *** microstructure of the segment was observed via SEM and the diamond blade fabricated using these segments was compared to other commercial cutting *** experimental results showed that the 3D lattice of diamond grits was formed in the green *** filling rate of diamond grits in the lattice could be guaranteed to be above 95%;this is much higher than the 90%filling rate of the automatic array system(ARIX).When used to cut stone,the cutting amount of the blade with segments made by AME100 is two times that of ordinary tools,with the same diamond *** used to dry cut reinforced concrete,its cutting speed is 10%faster than that of *** wet cutting conditions,its service life is twice that of *** applying the machine vision online inspection system and a special needle jig with a negative pressure system,this study developed a piece of additive manufacturing equipment for efficiently fabricating blade segments with a 3D lattice of diamond grits.

关键词： Diamond blade segment Additive manufacturing 3D lattice of diamond grits cold pressing equipment Machine vision inspection

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combined anisotropic and cyclic constitutive model for laser powder bed fusion fabricated aluminum alloy

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Chinese Journal of Aeronautics 2025年第1期38卷 165-184页

作者： Fei-Fan LI Jihong ZHU Weihong ZHANG Shifeng WEN Jingwen SONG Jun MA Gang FANG State IJR Center of Aerospace Design and Additive manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi'an 710072China Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway State Key Laboratory of Tribology in Advanced equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

This study presents new methods to effectively model the anisotropic yielding and hardening behavior of laser powder bed fusion fabricated aluminum alloy under both monotonic and cyclic loading *** proposed model combines the yield surface-interpolation method to accurately describe the anisotropic hardening rates in various directions,with the Chaboche kinematic hardening rule to precisely reflect the cyclic *** numerical implementation of the combined anisotropic and cyclic constitutive model,a fully implicit stress integration algorithm based on return mapping method is ***,the multiple parameters associated with the model are categorized and identified in an uncoupled *** isotropic and cyclic hardening parameters are determined by an inverse method,and the stability of the optimization outcomes is validated by applying different starting points for the ***,the back-stress effect on the identification of anisotropic parameters associated with the stress invariant-based Hill48 yield function is considered for the first *** consideration leads to an improved prediction accuracy compared to the identification of anisotropic parameters without considering back-stress *** combined anisotropic and cyclic constitutive model,along with the calibrated parameters,are proven capable of accurately reproducing the intricate deformation behavior of laser powder bed fusion fabricated AlSi10Mg.

关键词： constitutive models Anisotropy Kinematic hardening Laser powder bed fusion Aluminum alloys

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Design and development of a five-axis machine tool with high accuracy,stiffness and efficiency for aero-engine casing manufacturing

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Chinese Journal of Aeronautics 2022年第4期35卷 485-496页

作者： Yutian WANG Dong WANG Shizhen ZHANG Zihan TANG Liping WANG Yanmin LIU State Key Laboratory of Tribology and Institute of manufacturing Engineering Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Lab of Precision Ultraprecision manufacturing equipment and control Beijing 100084China Beijing Precision machinery&Engineering Research co.ltd Beijing 101312China Beijing Institute of control Engineering Beijing 100094China

In order to satisfy the machining requirements of aero-engine casing in modern aviation industry, this paper investigates three main issues during the design and development process of a five-axis machine tool with high accuracy, stiffness and efficiency, including whole structure design,key components design, and supporting stiffness design. First, an appropriate structure of five-axis machine tool is determined considering the processing characteristics of aero-engine casing. Then, a dual drive swing head and a compact motorized spindle are designed with enough drive capability and stiffness, and related structure, assembly method, cooling technology, and performance simulation are given in detail. Next, a design method of supporting stiffness of guide is proposed through the deformation prediction of the spindle end. Based on above work, a prototype of machine tool is developed, and some experiments are carried out, including performance tests of swing head and motorized spindle, and machining of a simulated workpiece of aero-engine casing. All experimental results show that the machine tool has satisfactory accuracy, stiffness and efficiency, which meets the machining requirements of aero-engine casing. The main work can be used as references for engineers and technicians, which are meaningful in practice.

关键词： Aero-engine casing manufacturing compact motorized spindle Dual drive swing head Five-axis machine tool Supporting stiffness

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The effects of pressure, temperature, and depth/diameter ratio on the microvia filling performance of Ag-coated Cu micro-nanoparticles for advanced electronic packaging

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International Journal of Smart and Nano Materials 2022年第4期13卷 543-560页

作者： Guannan Yang Shaogen Luo Bo Luo Yan Zuo Shiwo Ta Tingyu Lin Zhaohui Zhao Yu Zhang Chengqiang Cui State Key Laboratory of Precision Electronic manufacturing Technology and equipment Guangdong University of TechnologyGuangzhouGuangdongChina Jihua Laboratory FoshanGuangdongChina State Key Laboratory of Advanced Materials and Electronic components Fenghua Advanced Technology Co.LtdZhaoqingGuangdongChina Guangdong Fozhixin Microelectronics Technology Research co.ltd FoshanGuangdongChina Beijing compo Advanced Technology co.ltd BeijingChina

conductive fillers made from metal nanoparticles offer many advan-tages for the fabrication of a variety of electronic devices,but when they have a porous structure,their poor conductivity limits their adoption in many *** this study,an Ag-coated Cu micro-nanoparticle paste is used to achieve compact filling of blind vias on flexible copper clad polyimide laminates through a multistep filling and sintering *** filled blind vias achieve a resistivity as low as 6.2μΩ·cm,which is comparable that of electroplated blind *** sintering pressure and temperature promote the filling performance,while the conductivity deteriorates at a via depth/diameter ratio greater than 1:*** element simulations reveal a stress inhomogeneity in vias with large depth/diameter ratios,which is the key to understanding the evolution of the conductive properties of a paste-filled *** study provides an effective method for high-performance microvia filling as well as insights into the mechanism that influences its performance.

关键词： Ag-coated Cu micronanoparticles vertical interconnection microvia filling sintering

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Effects of fiber orientation on tool wear evolution and wear mechanism when cutting carbon fiber reinforced plastics

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Chinese Journal of Aeronautics 2023年第5期36卷 549-565页

作者： Weizhou WU Shipeng LI Xuda QIN Wentao LIU Xin CUI Hao LI Mengrui SHI Haibao LIU Key Laboratory of Mechanism Theory and equipment Design of Ministry of Education Tianjin UniversityTianjin 300350China Tianjin Aerospace Long March Launch Vehicle manufacturing co.ltd Tianjin 30000China Centre for Aeronautics School of AerospaceTransport and ManufacturingCranfield UniversityCranfield MK430ALUK

The aim of the present paper is to reveal the influence of different fiber orientations on the tool wear evolution and wear mechanism. Side-milling experiments with large-diameter milling tools are conducted. A finite element(FE) cutting model of carbon fiber reinforced plastics(CFRP)is established to get insight into the cutting stress status at different wear stages. The results show that different fiber orientations bring about distinct differences in the extent, profile and mechanism of tool wear. Severer wear occurs when cutting 45° and 90° plies, followed by 0°, correspondingly,the least wear is obtained when θ = 135°(θ represents the orientation of fibers). Moreover, the worn profiles of cutting tools when θ = 0° and 45° are waterfall edge, while round edge occurs whenθ = 135° and a combined shape of waterfall and round edge is obtained when θ = 90°. The wear mechanisms under different fiber orientations are strongly dependent on the cutting stress distributions. The evolution of tool wear profile is basically consistent with the stress distribution on the tool surface at different wear stages, and the extent of tool wear is determined by the magnitude of stress on the tool surface. Besides, the worn edges produce an actual negative clearance angle,which decreases the actual cutting thickness and leads to compressing and bending failure of fibers beneath the cutting region as well as low surface qualities.

关键词： Carbon fiber reinforced plastics(CFRP) Fiber orientation Finite element method(FEM) Tool wear Wear mechanism

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Three-dimensional temperature prediction in cylindrical turning with large-chamfer insert based on a modified slip-line field approach

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Chinese Journal of Aeronautics 2021年第10期34卷 265-281页

作者： Cheng HU Kejia ZHUANG Yuanwei TANG Jian WENG Xiaoming ZHANG Han DING Hubei Digital manufacturing Key Laboratory School of Mechanical and Electronic EngineeringWuhan University of TechnologyWuhan 430070China Institute of Advanced Materials and manufacturing Technology Wuhan University of TechnologyWuhan 430070China AECC Guizhou Liyang Aviation Power co.ltd Guiyang 550000China State Key Laboratory of Digital manufacturing equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China

Chamfered inserts have found broader applications in metal cutting process especially in high-performance machining of hard-to-cut materials for their excellent edge resistance and cutting ***,excessive heat generation and resulting high cutting temperature eventually cause severe tool wear and poor surface integrity,which simultaneously limits the optimal selection of machining *** the present study,an analytical thermal–mechanical model is proposed for the prediction of the three-dimensional(3-D)temperature field in cylindrical turning with chamfered round insert based on a modified slip-line field ***,an innovative discretization method is introduced in a general 3-D coordinate system to provide a comprehensive demonstration of the irregular cutting geometry and heat generation ***,a plasticity-theory-based slip-line field model is developed and employed to determine the intensities and geometries of every elementary heat sources in Primary Deformation Zones(PDZ),Secondary Deformation Zones(SDZ)and Dead Metal Zones(DMZ).At last,a 3-D analytical model is suggested to calculate the temperature increases caused by the entire heat sources and associated *** maximum cutting temperature region predicted is found existing upon the chip-tool contact area rather than the tool ***,the rationalities of cutting parameters employed are analyzed along with theoretical material removal rates and ensuing maximum cutting *** results indicate that the cutting conditions with large depth of cut and high cutting speed are more desirable than those with high feed *** proposed models are respectively verified through a series of 3-D Finite Element(FE)simulations and dry cutting experiments of Inconel 718 with chamfered round *** agreement has been reached between the predictions and simulations as well as the measurements,which confirms the correctness and effectiveness of the presented analy

关键词： Analytical model Chamfered round insert Dead metal zone Prediction of temperature Slip-line field

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