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The joint knowledge reasoning model based on knowledge representation learning for aviation assembly domain

Science China(Technological Sciences) 2024年第1期67卷 143-156页

作者： LIU PeiFeng QIAN Lu LU Hu XUE Lei ZHAO XingWei TAO Bo State Key Laboratory of Digital manufacturing Equipment and Technology Department of MechanicalHuazhong University of Science and TechnologyWuhan 430074China School of Transportation and Logistics Engineering Wuhan University of Technology(WHUT)Wuhan 430063China shanghai aircraft manufacturing co. Ltd.Shanghai 201324China

Knowledge graph technology is widely applied in the domain of general knowledge reasoning with an excellent performance.For fine-grained professional fields,professional knowledge graphs can provide more accurate information in practical industrial scenarios.Based on an aviation assembly domain-specific knowledge graph,the article co.structs a joint knowledge reasoning model,which co.bines a named entity reco.nition model and a subgraph embedding learning model.When performing knowledge reasoning tasks,the two models vectorize entities,relationships and entity attributes in the same space,so as to share parameters and optimize learning efficiency.The knowledge reasoning model,which provides intelligent question answering services,is able to reduce the assembly error rate and improve the assembly efficiency.The system can accurately solve general knowledge reasoning problems in the assembly process in actual industrial scenarios of general assembly and co.ponent assembly under interference-free co.ditions.Finally,this paper co.pares the proposed knowledge reasoning model based on knowledge representation learning and the question-answering system based on large-scale pre-trained models.In the application scenario of system functional testing in general assembly,the joint model attains an accuracy rate of 95%,outperforming GPT with 78%accuracy and enhanced representation through knowledge integration with 71%accuracy.

关键词： intelligent manufacturing knowledge graph aviation assembly knowledge representation knowledge-based question an-swering

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Influence of Electroshocking Treatment on Microstructure and Mechanical Properties of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Thin-Wall Specimen Manufactured by Laser Melting Deposition

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 145-158页

作者： Yan Wen Xuan Sun Jian Zhou Bingliang Liu Haojie Guo Yuxin Li Fei Yin Liqiang Wang Lechun Xie Lin Hua Hubei Key Laboratory of Advanced Technology for Automotive co.ponents Wuhan University of TechnologyWuhan430070China Hubei co.laborative Innovation Center for Automotive co.ponents Technology Wuhan430070China Hubei Longzhong Laboratory Xiangyang441000China shanghai aircraft manufacturing co. Ltd.Commercial Aircraft Corporation of ChinaLtd.Shanghai201324China State Key Laboratory of Metal Matrix co.posites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

In order to improve the properties of titanium alloys manufactured by laser melting deposition(LMD),the electroshocking treatment(EST)was proposed in this work.The effects of EST on microstructure and mechanical properties of LMD Ti-6.5Al-3.5Mo-1.5Zr-0.3Si were investigated.The results showed that the width of the heat affected band decreased and disappeared under the thermal and athermal effects of EST,resulting in the uniform microstructure.In the microstructure,theαlaths became co.rser gradually,and the quantity ofα/βinterface was reduced.The reduction of the quantity ofα/βinterface leads to make less resistant to dislocation,resulting in the reduction in hardness and strength.The disco.tinuous grain boundaryαphase and nucleationαco.ony near grain boundary inhibited the crack propagation and improved the ductility.Summary,EST can manipulate the microstructure and improve the mechanical properties of LMD titanium alloys.

关键词： Electroshocking treatment(EST) Laser melting deposition(LMD) Titanium alloy Microstructure Mechanical properties

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Improvement of titanium alloy TA19 fatigue life by submerged abrasive waterjet peening:co.relation of its process parameters with surface integrity and fatigue performance

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Chinese Journal of Aeronautics 2024年第1期37卷 377-390页

作者： Gongyu WANG Shulei YAO Yuxin CHI Chengcheng ZHANG Ning WANG Yalong CHEN Rongsheng LU Zhuang LI Xiancheng ZHANG Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China AECC co.mercial aircraft Engine co.LTD Shanghai Engineering Research Center for Commercial Aircraft EngineShanghai 201108China

Submerged abrasive waterjet peening(SAWJP)is an effective anti-fatigue manufacturing technology that is widely used to strengthen aeroengine co.ponents.This study investigated the co.relation of SAWJP process parameters on surface integrity and fatigue life of titanium alloy TA19.SAWJP with different water pressures and standoff distances(SoDs)was co.ducted on the TA19 specimens.The surface integrity of the specimens before and after SAWJP with different process parameters was experimentally studied,including microstructure,surface roughness,microhardness,and co.pressive residual stress(CRS).Finally,fatigue tests of the specimens before and after SAWJP treatment with different process parameters were carried out at room temperature.The results highlighted that the fatigue life of the TA19 specimen can be increased by 5.46,5.98,and 6.28 times under relatively optimal process parameters,which is mainly due to the improved surface integrity of the specimen after SAWJP treatment.However,the fatigue life of specimens treated with improper process parameters is decreased by 0.55 to 0.69 times owing to the terrible surface roughness caused by the material erosion.This work verifies that SAWJP can effectively improve the surface integrity and fatigue life of workpieces,and reveals the relationship between process parameters,surface integrity,and fatigue life,which provides support for the promotion of SAWJP in the manufacturing fields.

关键词： Fatigue testing Process parameters Submerged abrasive waterjet peening Surface integrity Surface treatment Titanium alloy TA19

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Design, modeling, and evaluation of parallel co.tinuum robots: A survey

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Science China(Technological Sciences) 2024年第3期67卷 673-695页

作者： CHEN GenLiang TANG ShuJie DUAN XuYang WANG Hao Meta Robotics Institute Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China shanghai Key Laboratory of Digital manufacturing for Thin-Walled Structures Shanghai Jiao Tong UniversityShanghai 200240China

Parallel co.tinuum robots(PCRs) have attracted increasing attention in the robotics co.munity due to their simplicity in structure,inherence with co.pliance, and easiness of realization. Over the past decade, a variety of novel designs have been reported to enrich their diversity. However, there is a lack of systematic review of these emerging robots. To this end, this paper co.ducts a co.prehensive survey on the mechanism design, kinetostatic modeling and analysis, and performance evaluation. For these robots, kinetostatic modeling plays a fundamental role throughout the design, analysis, and co.trol stages. A systematic review of the existing approaches for kinetostatic modeling and analysis is provided, and a co.parison is made to distinguish their differences. As well, a classification is made acco.ding to the characteristics of structure and actuation. In addition, performance evaluation on the workspace, stability, and singularity is also overviewed. Finally, the scenarios of potential applications are elaborated, and future research prospects are discussed. We believe that the information provided in this paper will be particularly useful for those who are interested in PCRs.

关键词： parallel co.tinuum robots classification kinetostatic modeling performance evaluation

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CableSAM: an efficient automatic segmentation method for aircraft cabin cables

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Optoelectronics Letters 2024年

作者： LING Aihua WANG Junwen LU Jiaming LIU Ruyu School of Information Science and Technology Hangzhou Normal University shanghai aircraft manufacturing co. Ltd School of co.puter Science and Engineering Tianjin University of Technology

Cabin cables， as critical co.ponents of an aircraft’s electrical system， significantly impact the operational efficiency and safety of the aircraft. The existing cable segmentation methods in civil aviation cabins are limited， especially in automation， being heavily dependent on large amounts of data and resources， lacking the flexibility to adapt to different scenarios. To address these challenges， this paper introduces a novel image segmentation model， CableSAM， specifically designed for automated segmentation of cabin cables. CableSAM improves segmentation efficiency and accuracy using knowledge distillation and employs a co.text ensemble strategy. It accurately segments cables in various scenarios with minimal input prompts. co.parative experiments on three cable datasets demonstrate that CableSAM surpasses other advanced cable segmentation methods in performance.

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co.laborative force and shape co.trol for large co.posite fuselage panels assembly

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Chinese Journal of Aeronautics 2023年第7期36卷 213-225页

作者： Zhanghao WANG Dongsheng LI Liheng SHEN Yi SUI Yunong ZHAI School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Ningbo Institute of Technology Beihang UniversityNingbo 315832China comac shanghai aircraft manufacturing co. LtdShanghai 201324China

This study proposed a force and shape co.laborative co.trol method that co.bined method of influence co.fficients(MIC)and the elitist nondominated sorting genetic algorithm(NSGA-II)to reduce the shape deviation caused by manufacturing errors,gravity deformation,and fixturing errors and improve the shape accuracy of the assembled large co.posite fuselage panel.This study used a multi-point flexible assembly system driven by hexapod parallel robots.The proposed method simultaneously co.siders the shape deviation and assembly load of the panel.First,a multi-point flexible assembly system driven by hexapod parallel robots was introduced,with the relevant variables defined in the co.trol process.In addition,the co.responding mathematical model was co.structed.Subsequently,MIC was used to establish the prediction models between the displacements of actuators and displacements of panel shape co.trol points,deformation loads applied by the actuators.Following the modeling,the shape deviation of the panel and the assembly load were used as the optimization objectives,and the displacements of actuators were optimized using NSGA-II.Finally,a typical co.posite fuselage panel case study was co.sidered to demonstrate the effectiveness of the proposed method.

关键词： Assembly co.laborative force and shape co.trol co.posite panel Hexapod parallel robots Method of influence co.fficients

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Influence of bolt dynamic installation on topography characteristics and mechanical behaviors of CFRP interference-fit bolted joints

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Chinese Journal of Aeronautics 2024年第2期37卷 482-500页

作者： Xiaohe WANG Zengqiang CAO Yuehaoxuan WANG Yingjiang GUO School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China NPU Xuhang Electromagnetic Technology co. Ltd.Xi’an 710100China

As the co.trolled research of Dynamic Installation(DI)and Static Installation(SI),a new interference installation method was developed based on electromagnetic loading to enhance the mechanical properties of co.posite structures.Four different interference-fit sizes were co.sidered,ranging from a net fit to 2.0%.The experiments were co.ducted to evaluate the installation resistance and the mechanical behavior of the joint under external loads.Meanwhile,an FFA model to model the stress distribution and damage behavior of the bolt-hole co.tact interface was established.The load-displacement curve and damage modes of experiments were used to verify the FEA results.The results show that the installation resistance during DI process was remarkably lower than that of SI process co.responding to all interference-fit sizes,and the stress amplitudes induced by interference were larger and widely distributed.The damage of the hole wall was positively co.related with interference fit size,but DI can significantly reduce the damage co.pared to SI.In performance tests,DI enhanced the static bearing capacity and extended longer fatigue life of the joints than SI.DI methods can be an effective way to achieve highly reliable interference joints in co.posite structures.

关键词： Carbon Fiber-Reinforced Polymer(CFRP) Bolted joints Interference-fit Electromagnetic installation Finite Element Analysis(FEA) Damage mechanics Bearing behavior

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In-process adaptive milling for large-scale assembly interfaces of a vertical tail driven by real-time vibration data

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Chinese Journal of Aeronautics 2022年第5期35卷 441-454页

作者： Xiong ZHAO Lianyu ZHENG Lu YU School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China C919 Division Shanghai Aircraft Manufacturing Co.LtdShanghai 201324China

Assembly interfaces,the joint surfaces between the vertical tail and rear fuselage of a large aircraft,are thin-wall co.ponents.Their machining quality are seriously restricted by the machining vibration.To address this problem,an in-process adaptive milling method is proposed for the large-scale assembly interface driven by real-time machining vibration data.Within this co.text,the milling operation is first divided into several process steps,and the machining vibration data in each process step is separated into some data segments.Seco.d,based on the real-time machining vibration data in each data segment,a finite-element-unit-force approach and an optimized space–time domain method are adopted to estimate the time-varying in-operation frequency response functions of the assembly interface.These FRFs are in turn employed to calculate stability lobe diagrams.Thus,the three-dimensional stability lobe diagram co.sidering material removal is acquired via interpolation of all stability lobe diagrams.Third,to restrain milling chatter and resonance,the cutting parameters for next process step,e.g.,spindle speed and axial cutting depth,are optimized by genetic algorithm.Finally,the proposed method is validated by a milling test of the assembly interface on a vertical tail,and the experimental results demonstrate that the proposed method can improve the machining quality and efficiency of the assembly interface,i.e.,the surface roughness reduced from 3.2μm to 1.6μm and the machining efficiency improved by 33%.

关键词： Adaptive milling Assembly interfaces Data-driven Time-varying frequency response function Vertical tail

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An improved yield criterion characterizing the anisotropic and tension-co.pression asymmetric behavior of magnesium alloy

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Journal of Magnesium and Alloys 2022年第2期10卷 612-628页

作者： Zhigang Li Haifeng Yang Jianguang Liu Fu Liu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing100044PR China Automotive Research Institute of Beijing Automotive co. Ltd.Beijing 101300China Beijing Key Laboratory of Civil aircraft Structures and co.posite Materials COMAC Beijing Aircraft Technology Research InstituteBeijing102211PR China shanghai aircraft Design and Research Institute Shanghai 201210PR China

A novel yield criterion based on CPB06 co.sidering anisotropic and tension-co.pression asymmetric behaviors of magnesium alloys was derived and proposed(called M_CPB06).This yield criterion can simultaneously predict the yield stresses and the Lankford ratios at different angles(if any)under uniaxial tension,co.pression,equal-biaxial and equal-co.pression co.ditions.Then,in order to further describe the anisotropic strain-hardening characteristics of magnesium alloy,the proposed M_CPB06 criterion was further evolved to the M_CPB06ev model by expressing the parameters of the M_CPB06 model as functions of the plastic strain.As the model was developed,the stresses and Lankford ratios of AZ31B and ZK61M magnesium alloys at different angles under tensile,co.pressive and through-thickness co.pressive co.ditions were used to calibrate the M_CPB06/M_CPB06ev and the existing CPB06ex2 model.Calibration results reveal that co.pared with the CPB06ex2 yield criterion with equal quantity of co.fficients,the M_CPB06 criterion exhibits certain advancement,and meanwhile the M_CPB06ev model can relatively accurately predict the change of the yield locus with increase of the plastic strain.Finally,the M_CPB06ev model was developed through UMAT in LS-DYNA.Finite element simulations using the subroutine were co.ducted on the specimens of different angles to the rolling direction under tension and co.pression.Simulation results were highly co.sistent with the experimental results,demonstrating a good reliability and accuracy of the developed subroutine.

关键词： Magnesium alloy Anisotropy Tension-co.pression asymmetry Improved yield criterion UMAT

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Toward an understanding of dwell fatigue damage mechanism of bimodal Ti-6Al-4V alloys

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Journal of Materials Science & Technology 2022年第13期108卷 244-255页

作者： L.R.Zeng L.M.Lei X.M.Luo G.P.Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Mechanical Engineering Chengdu UniversityChengdu 610106China AECC shanghai co.mercial aircraft Engine manufacturing co. Ltd.Shanghai 201306China

Dwell fatigue effect is a long-standing problem threatening the long-term service reliability for fan blades and fan disks of an aircraft engine.To understand the basic mechanism of dwell fatigue damage,pure fatigue and 60 s dwell fatigue properties of bimodal Ti-6Al-4V alloys with different volume fractions of the primaryα(α_(p))phase were examined co.paratively.The results showed that both pure fatigue and dwell fatigue life decreased with increasing the volume fraction of theα_(p)phase and the dwell fatigue life was lower than the pure fatigue one.The quasi-in-situ test results and the quantitative characterization of damage behaviors of the local microstructure units defined by theα_(p)-seco.daryα(α_(s))co.bination reveal that theα_(s)phase close to theα_(p)phase with extensively slip activities was gradually damaged under dwell fatigue loading,while that under pure fatigue loading was undamaged,demonstrating that the dwell loading induced the damage of theα_(s)phase,and further reduced the fatigue life.A stress relaxation-based model is proposed to describe the physical mechanism on dwell fatigue damage of the bimodal Ti-6Al-4V alloy,i.***.the elastic deformation of theα_(s)phase caused by the strain inco.patibility would be gradually transformed into plastic deformation during the dwell stage,and thus promotes fatigue damage.The model provides new insights into the microsco.ic process of stress/strain transfer between the soft and hard microstructure units under dwell fatigue loading.

关键词： Dwell effect Fatigue damage Stress relaxation Volume fraction of primaryαphase Quasi-in-situ testing

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