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A Robust Roll Stabilization co.troller with Aerodynamic Disturbance and Actuator Failure co.sideration

co.puter Modeling in Engineering & Sciences 2020年第1期122卷 109-130页

作者： Qiancai Ma Fengjie Gao Yang Wang Qiuxiong Gou Liangyu Zhao School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China hiwing aviation general equipment co.Ltd. Beijing100074China Xi’an Modern co.trol Technology Research Institute Xi’an710054China

co.bining adaptive theory with an advanced seco.d-order sliding mode co.trol algorithm,a roll stabilization co.troller with aerodynamic disturbance and actuator failure co.sideration for spinning flight vehicles is proposed in this *** presented co.troller is summarized as an“observer-co.troller”*** specifically,an adaptive seco.dorder sliding mode observer is presented to select the proper design parameters and estimate the knowledge of aerodynamic disturbance and actuator failure,while the proposed roll stabilization co.trol scheme can drive both roll angle and rotation rate smoothly co.verge to the desired *** analysis and numerical simulation results demonstrate the effectiveness of the proposed co.troller.

关键词： Roll stabilization fault-tolerant co.trol aerodynamic disturbance actuator failure precision strike

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Static aeroelasticity of the propulsion system of ion propulsion unmanned aerial vehicles

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Propulsion and Power Research 2023年第3期12卷 336-355页

作者： Shuai Hao Tielin Ma She Chen Hongzhong Ma Jinwu Xiang Fangxiang Ouyang School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Research Institute of Unmanned Systems Beihang UniversityBeijing 100191China hiwing general aviation equipment co. Ltd.Beijing 100074China co.lege of Electrical and Information Engineering Hunan UniversityChangsha 410082China

“Ionic wind”generators are used as the main propulsion system in ion propulsion unmanned aerial vehicles(UAVs).Owing to the large size and poor stiffness of the electrode array in the propulsion system,the electrode array is prone to deformation under the flight *** this work,the thrust characteristics and static aeroelastic properties of“ionic wind”propulsion systems were analyzed in *** simulation model for an“ionic wind”propulsion system was established by co.pling a two-dimensional gas discharge model with a gas dynamics *** influences of electrode voltage,spacing,size,and shape on the performance of the propulsion system were *** fluid-solid interaction method was used to solve static aeroelastic characteristics under *** aerodynamic and thrust performances of the elastic state and the rigid state were *** was found that the operating voltage,the distance between two electrodes,and the emitter radius had greater impacts on the thrust of the propulsion *** propulsion system had a small co.tribution to the lift but a large co.tribution to the *** the elastic state,the lift co.fficient acco.nted for 12.2%,and the drag co.fficient acco.nted for 25.8%.Under the action of the downwash airflow from the wing,the propulsion system formed an upward moment around the center of mass,which co.tributed greatly to the pitching moment derivative of the whole *** the elastic state,the pitching moment derivative acco.nted for 29.7%.After elastic deformation,the thrust action point moved upward by 28.7 ***,the no lift pitching moment is reduced by 0.104 N$m,and the pitching moment co.fficient is reduced by 0.014,causing a great impact on the longitudinal trimming of the whole aircraft.

关键词： Ion propulsion unmanned aerial vehicle(UAV) Propulsion system Electro-aerodynamics Static aeroelasticity Fluid-solid interaction

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Recent active thermal management technologies for the development of energy-optimized aerospace vehicles in China

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Chinese Journal of Aeronautics 2021年第2期34卷 1-27页

作者： Jixiang WANG Yunze LI Xiangdong LIU Chaoqun SHEN Hongsheng ZHANG Kai XIONG co.lege of Electrical Energyand Power EngineeringYangzhou UniversityYangzhou 225009China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Institute of Engineering Thermophysics North China University of Water Conservancy and Electrical PowerZhengzhou 450045China hiwing general aviation equipment co.poration Limited Beijing 100074China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen Graduate SchoolShenzhen 518117China

Recently, the development of modern vehicles has brought about aggressive integration and miniaturization of on-board electrical and electronic devices. It will lead to exponential growth in both the overall waste heat and heat flux to be dissipated to maintain the devices within a safe temperature range. However, both the total heat sinks aboard and the co.ling capacity of currently utilized thermal co.trol strategy are severely limited, which threatens the lifetime of the on-board equipment and even the entire flight system and shrink the vehicle’s flight time and range. Facing these thermal challenges, the USA proposed the program of "INVENT" to maximize utilities of the available heat sinks and enhance the co.ling ability of thermal co.trol strategies. Following the efforts done by the USA researchers, scientists in China fought their ways to develop thermal management technologies for Chinese advanced energy-optimized airplanes and spacecraft. This paper elaborates the available on-board heat sinks and aerospace thermal management systems using both active and passive technologies not co.fined to the technology in China. Subsequently, active thermal management technologies in China including fuel thermal management system, environment co.trol system, non-fuel liquid co.ling strategy are reviewed. At last, space thermal co.trol technologies used in Chinese Space Station and Chang’e-3 and to be used in Chang’e-5 are *** issues to be solved are also identified, which co.ld facilitate the development of aerospace thermal co.trol techniques across the world.

关键词： Aerospace engineering Efficiency promotion Fluid dynamics Heat and mass transfer Thermal management

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

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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 *** fine-grained professional fields,professional knowledge graphs can provide more accurate information in practical industrial *** 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 *** 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 *** knowledge reasoning model,which provides intelligent question answering services,is able to reduce the assembly error rate and improve the assembly *** 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 ***,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 *** 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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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 co.rdinate system to provide a co.prehensive 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),Seco.dary 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 co.tact 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 co.ditions 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 Inco.el 718 with chamfered round *** agreement has been reached between the predictions and simulations as well as the measurements,which co.firms the co.rectness 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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Layout design of a mixed-flow production line based on processing energy co.sumption and buffer co.figuration

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Advances in Manufacturing 2021年第3期9卷 369-387页

作者： Cai-Xia Zhang Shu-Lin Dong Hong-Yan Chu Guo-Zhi Ding Zhi-Feng Liu Shi-Yao Guo Chong-Bin Yang Institute of Advanced Manufacturing and Intelligent Technology Beijing University of TechnologyBeijing100124People’s Republic of China Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing100124People’s Republic of China Beijing Xinghang Electromechanical equipment co. Ltd.Beijing100074People’s Republic of China School of Mechanical Engineering and Automation Beihang UniversityBeijing100191People’s Republic of China

Green manufacturing is a growing trend,and an effective layout design method for production lines can reduce resource wastage in *** study focuses on existing problems such as low equipment utilization,long standby time,and low logistics efficiency in a mixed-flow parallel production *** reduce the energy co.sumption,a novel method co.sidering an independent buffer co.figuration and idle energy co.sumption analysis is proposed for this production line’s layout design.A logistics intensity model and a machine tool availability model are established to investigate the influences of independent buffer area co.figuration on the logistics intensity and machine tool *** solve the co.pling problem between machine tools in such production lines,a deco.pling strategy for the relationship between machine tool processing rates is *** energy co.sumption model for the machine tools,based on an optimized co.figuration of independent buffers,is *** model can effectively reduce the idle energy co.sumption of the machine tools while designing the workshop ***,co.sidering the problems enco.ntered in workshop production,a co.prehensive optimization model for the mixed-flow production line is *** verify the effectiveness of the mathematical model,it is applied to an aviation cabin production *** results indicate that it can effectively solve the layout problem of mixed-flow parallel production lines and reduce the idle energy co.sumption of machine tools during *** proposed buffer co.figuration and layout design method can serve as a theoretical and practical reference for the layout design of mixed-flow parallel production lines.

关键词： Layout design Energy co.sumption Mixed flow production line Independent buffer co.figuration

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