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Effects of dynamical spanwise retraction and stretch on flapping-wing forward flights

Chinese Journal of Aeronautics 2024年第4期37卷 181-202页

作者： Kang LIU Bifeng SONG Ang CHEN zhihe wang Dong XUE Wenqing YANG School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Intelligent Aircraft Research Center Chengdu Technological UniversityChengdu 610031China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Harbin Institute of Technology Shenzhen 518055China

Birds and bats retract and stretch their wings dynamically during each flap in level flights, implying intriguing mechanisms for the aerodynamic performance improvement of flapping wings. A numerical investigation into the aerodynamic effects of such bio-inspired concept in forward flights has been performed based on a three-dimensional wing in plunging motion and a twosection wing in flapping motion. The currently considered Reynolds number and Strouhal number are Re=1.5×10^(5) and St=0.3, respectively. During the research, the mean angle of attack is varied in relatively wide ranges to achieve lift-thrust interconversion for the wings. The conclusive results show that dynamical spanwise retraction and stretch has induced three absolutely desirable scenarios for the oscillating wings in forward flights, namely producing more lift and consuming less power for a given thrust generation, producing more thrust and consuming less power for a given lift generation, and producing more lift and more thrust while consuming less power. Furthermore,the morphing wings have alleviated periodical aerodynamic load fluctuations compared with the non-morphing baseline. The mechanism of the aerodynamic effects of the bionic morphing mode is analyzed with the aid of field visualization. The current article is the first to reveal the absolute advantages of the bionic spanwise morphing. Hopefully, it may help comprehend the behaviors of natural fliers and provide inspirations for performance enhancement of micro artificial flappingwing vehicles.

关键词： Flapping wing Morphing wing Bionic Aerodynamics Vortex Flight

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Experimental Study on the Effect of Increased Downstroke Duration for an FWAV with Morphing-coupled Wing Flapping Configuration

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Journal of Bionic Engineering 2024年第1期21卷 192-208页

作者： Ang Chen Bifeng Song zhihewang Kang Liu Dong Xue Xiaojun Yang School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Harbin Institute of Technology Shenzhen 518055China

This paper is based on a previously developed bio-inspired Flapping Wing Aerial Vehicle(FWAV),RoboFalcon,which can fly with a morphing-coupled flapping *** this paper,a simple flapping stroke control system based on Hall effect sensors is designed and applied,which is capable of assigning different up-and down-stroke speeds for the RoboFalcon platform to achieve an adjustable downstroke *** aerodynamic and power characteristics of the morphing-coupled flapping pattern and the conventional flapping pattern with varying downstroke ratios are measured through a wind tunnel experiment,and the corresponding aerodynamic models are developed and analyzed by the nonlinear least squares *** relatively low power consumption of the slow-downstroke mode of this vehicle is verified through outdoor flight *** results of wind tunnel experiments and flight tests indicate that increased downstroke duration can improve aerodynamic and power performance for the RoboFalcon platform.

关键词： Flapping wing aerial vehicle(FWAV) Downstroke ratio Bio-inspired design Morphing-coupled flapping

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基于AI的车载“美育&美愈”虚拟空间交互设计研究

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艺术科技 2024年第4期37卷 96-99,103页

作者：刘了箬王之禾孙妍北京师范大学艺术与传媒学院北京师范大学历史学院北京100875 北京理工大学计算机学院北京100081

目的:面对“Z世代”大学生日益凸显的心理健康问题和新能源汽车智能座舱正朝着场景智能化、情感化服务、多模态融合交互等方向发展的趋势,将美育和艺术治疗应用于新能源汽车领域,开展车载虚拟空间交互设计研究,能够使新能源汽车为“Z世... 详细信息

目的:面对“Z世代”大学生日益凸显的心理健康问题和新能源汽车智能座舱正朝着场景智能化、情感化服务、多模态融合交互等方向发展的趋势,将美育和艺术治疗应用于新能源汽车领域,开展车载虚拟空间交互设计研究,能够使新能源汽车为“Z世代”大学生提供情绪价值,以提升其审美力、心理健康水平和幸福感。方法:文章采用SAS焦虑自评量表等调查问卷及访谈法收集数据,调查“Z世代”大学生情绪问题及其对新能源汽车的需求。应用唐纳德·诺曼基于反思层的情感化设计理论和凯伦·霍尔兹布拉特的情景化设计方法,以及艺术治疗、美育、人工智能等方法。关键技术与算法模型在考虑国外新能源汽车发展的理念和趋势以及国内实际情况的基础上,对情感识别、深度学习、多模态融合交互和情感化人工智能等技术进行合理的组合和应用。结果:基于调查数据进行客户画像和情景化故事板设计,在此基础上设计出基于人工智能的车载“美育&美愈”虚拟空间交互模型,以实现预期的研究目标。结论:调查发现,“Z世代”大学生存在各种消极情绪,平均焦虑指数高于正常值,而基于人工智能的车载“美育&美愈”虚拟空间交互模型有助于缓解其焦虑情绪,培养审美能力,具有应用价值和推广前景。研究不仅拓展了基于人工智能的美育与艺术治疗的应用领域,还为针对“Z世代”的新能源汽车交互设计提供了新的视角和实施路径。

关键词：艺术治疗美育虚拟空间人工智能车载交互设计

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Development of a Bird-like Flapping-wing Aerial Vehicle with Autonomous Take-off and Landing Capabilities

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Journal of Bionic Engineering 2021年第6期18卷 1291-1303页

作者： Dongfu Ma Bifeng Song zhihe wang Jianlin Xuan Dong Xue School of Aeronautics Northwestern Polytechnical UniversityXi’an710072China Yangtze River Delta Research Institute of Northwestern Polytechnical University Taicang215400China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen518057China

The lack of autonomous take-off and landing capabilities of bird-like flapping-wing aerial vehicles(BFAVs)seriously restricts their further development and ***,combined with the current research results on the autonomous take-off and landing technology of unmanned aerial vehicles,four types of technologies are studied,including jumping take-off and landing technology,taxiing take-off and landing technology,gliding take-off and landing technology,and vertical take-off and landing(VTOL)*** on the analytic hierarchy process(AHP)-comprehensive evaluation method,a fuzzy comprehensive evaluation model for the autonomous take-off and landing scheme of a BFAV is established,and four schemes are evaluated *** results show that under the existing technical conditions,the hybrid layout VTOL scheme is the ***,the detailed design and development of the prototype of a BFAV with a four-rotor hybrid layout are carried out,and the vehicle performance is *** results prove that through the four-rotor hybrid layout design,the BFAV has good autonomous take-off and landing *** power consumption analysis shows that for a fixed-point reconnaissance mission,when the mission radius is less than 3.38 km,the VTOL type exhibits longer mission duration than the hand-launched type.

关键词： Bird-like flapping-wing aerial vehicle(BFAV) Autonomous take-off and landing Take-off mechanism Hybrid layout

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Fracture Characteristics and Heat Accumulation of Jixianian Carbonate Reservoirs in the Rongcheng Geothermal Field, Xiong'an New Area

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Acta Geologica Sinica(English Edition) 2021年第6期95卷 1902-1914页

作者： wang Yingjin MA Feng XIE Heping wang Guiling wang zhihe Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Technology Innovation Center for Geothermal&Hot Dry Rock Exploration and Development Ministry of Natural ResourcesShijiazhuang 050061China

Geothermal energy plays an important role in urban construction of the Xiong’an New Area. Geothermal reservoir fracture distribution of the Mesoproterozoic Jixianian Wumishan Formation(Fm.) carbonate reservoir in the Rongcheng geothermal field are evaluated based on FMI log from Wells D19 and D21. The results show carbonate reservoir fracture density of Well D19 is 15.2/100 m, greater than that of Well D21 with a value of 9.2/100 m. Reservoir porosity and permeability of Well D19 are better than that of Well D21, and the water saturation is bimodally distributed. The movable fluid volume ratio(BVM) of Well D19 is 2% to 8% with some zones exceeding 20%, while the value of Well D21 is less than 4%. Therefore, reservoir fractures in Well D19 are more conducive to fluid flow. Reservoir fractures have a similar occurrence to normal faults, indicating that the tensile stress field controlled the formation of such fractures. Developed reservoir fractures provide a good channel for groundwater convection. The circulation of regional groundwater and the heat exchange between water and rock and the multiple heat accumulation patterns form a stable and high potential heat reservoir in the Rongcheng geothermal field.

关键词： geothermal resource carbonate reservoir fracture FMI log in-situ stress

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A novel fractal-statistical scaling model of rocks considering strain rate

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第11期15卷 2831-2841页

作者： Changtai Zhou Heping Xie zhihe wang Tao Zhou Jianbo Zhu Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen518060China

The scaling-dependent behaviors of rocks are significant to the stability and safe operation of the structures built in or on rock masses for practical ***,many size effect models are employed to connect laboratory measurements at small scales and engineering applications at large ***,limited works consider the strain rate *** this study,an fractal-statistical scaling model incorporating strain rate is proposed based on a weakest-link approach,fractal theory and dynamic fracture *** proposed scaling model consists of 8 model parameters with physical meaning,***-dependent parameter,intrinsic material parameter,dynamic strain rate,quasi-static strain rate,quasi-static fracture toughness,micro-crack size,micro-crack intensity and fractal dimension,enabling the proposed scaling model to model the scaling behaviors under different external *** predictions are consistent with experimental data on red sandstone,proving the reliability and effectiveness of the proposed scaling ***,the scaling behaviors of rocks under dynamic loading conditions can be captured by the proposed fractal-statistical scaling *** sensitivity analysis indicates that the nominal strength difference becomes more obvious with a higher strain rate,larger fractal dimension,smaller micro-crack size or lower micro-crack ***,the proposed scaling model has the potential to capture the scaling behaviors considering the thermal effect,weathering effect,anisotropic characteristic etc.,as the proposed scaling model incorporated model parameters with physical *** findings of this study are of fundamental importance to understand the scaling behaviors of rock under dynamic loading condition,and thus would facilitate the appropriate design of rock engineering.

关键词： Size effect Strain rate Uniaxial compressive strength(UCS) Dynamic fracture mechanics

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Multi-ion intercalated Ti_(3)C_(2)T_(x)MXene and the mutual modulation within interlayer

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Particuology 2023年第1期72卷 10-16页

作者： zhihe wang Yixuan wang Qinhua Gu Cuimei Zhao Junkai Zhang Shichong Xu Ming Lu Bingsen Zhang Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education the Joint Laboratory of MXene MaterialsKey Laboratory of Preparation and Application of Environmental Friendly Materials of the Ministry of EducationJilin Normal UniversityChangchun 130103China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Intercalation of ions between the adjacent MXene layers can change the interlayer environment and influence the electrochemical ion storage *** order to understand the effect of multi-ions confined by the MXene layers on the performance of electrochemical energy storage,Co^(2+),Mn^(2+)and Ni^(2+)intercalated into Ti_(3)C_(2)T_(x)MXene which already pre-intercalated Al3+are obtained by spontaneous static *** on the monitor of(002)crystal orientation,intercalated multi-ions can regulate and control the interlayer environment of MXenes via stress,which induces lattice shrinkage occurring in the c *** by ion storage mechanism-performance,the multi-ion occupies the interspace of MXene and affects the electrochemical *** work would offer guidance to understand the relationship among the multi-ion and MXene by two-dimensional(2D)layered materials.

关键词： MXene lon pre-intercalation Interlayer Transition metal ion

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A robust optimization method for energy management of CCHP microgrid

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 132-144页

作者： Zhao LUO Wei GU Zhi WU zhihe wang Yiyuan TANG School of Electrical Engineering Southeast University School of Electronic Electrical and Systems EngineeringUniversity of Birmingham

Energy management is facing new challenges due to the increasing supply and demand uncertainties,which is caused by the integration of variable generation resources,inaccurate load forecasts and non-linear efficiency *** meet these challenges,a robust optimization method incorporating piecewise linear thermal and electrical efficiency curve is proposed to accommodate the uncertainties of cooling,thermal and electrical load,as well as photovoltaic(PV)output *** study results demonstrate that the robust optimization model performs better than the deterministic optimization model in terms of the expected operation *** fluctuation of net electrical load has greater effect on the dispatching results of the combined cooling,heating and power(CCHP)microgrid than the fluctuation of the cooling and thermal *** day-ahead schedule is greatly affected by the uncertainty budget of the load *** economy of the optimal decision could be achieved by adjusting different uncertainty budget levels according to control the conservatism of the model.

关键词： Combined cooling Heating and power(CCHP) Microgrid Piecewise linear Robust optimization Uncertainty

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三向应力下支护应力对圆形巷道围岩应力分布规律的影响

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采矿与岩层控制工程学报 2024年第3期6卷 114-123页

作者：郑建伟管增伦鞠文君张修峰薛珊珊王帅李海涛杨国强李春元王之禾煤炭科学研究总院有限公司深部开采与冲击地压防治研究院北京100013 中国中煤能源集团有限公司北京100120 中煤科工开采研究院有限公司北京100013 山东能源集团有限公司冲击地压防治研究中心山东济南250014 中煤科工集团沈阳研究院有限公司辽宁抚顺113122 深圳大学土木与交通工程学院深地科学与绿色能源研究院广东深圳518060

为进一步探究支护应力对圆形巷道应力分布特征的影响规律,建立了考虑三向应力和支护应力条件下的巷道围岩力学模型,推导了巷道围岩煤岩体应力分布的解析方程,借助COMSOL进行了可靠性验证;通过赋值法讨论了13种应力边界(三向应力P_(x),P_... 详细信息

为进一步探究支护应力对圆形巷道应力分布特征的影响规律,建立了考虑三向应力和支护应力条件下的巷道围岩力学模型,推导了巷道围岩煤岩体应力分布的解析方程,借助COMSOL进行了可靠性验证;通过赋值法讨论了13种应力边界(三向应力P_(x),P_(y),P_(z))及4种支护应力(0.2,1,2,5 MPa)下巷道围岩煤岩体径向应力、切向应力和轴向应力的分布情况。研究结果表明:(1)当水平应力(P_(x))大于垂直应力(P_(y))时,轴向应力随着深距(至巷道表面距离)的增加而增加;当水平应力(P_(x))小于垂直应力(P_(y))时,轴向应力随着深距的增加而降低;(2)当水平应力(P_(x))等于垂直应力(P_(y))时,轴向应力值不变,径向应力随着深距的增加而增加,切向应力随着深距的增加而降低;(3)围岩上的切向应力随着支护应力的增加而降低,过高的支护应力将导致局部拉应力的出现;径向应力随着支护应力的增加而增加;一定程度的支护应力不仅可以使巷道表面围岩从两向应力状态恢复到三向应力状态,同时可以降低切向应力,增加径向应力,降低围岩上的剪应力,均化巷道围岩应力,从而维护巷道的稳定性。

关键词：巷道力学分析三向应力支护应力主动支护应力均化

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离子液体在CO_(2)捕集中的开发与应用

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能源化工 2024年第1期45卷 16-20页

作者：汪志和张明俊杨平崔广才四川益能康生环保科技有限公司四川成都610036

对比分析了吸收和吸附、化学链燃烧和低温蒸馏、基于水合物的分离和膜分离等用于CO_(2)捕集、利用与封存(CCUS)方法的优缺点,溶剂吸收法的高能量需求、溶剂的损失和降解、腐蚀性和毒性等限制了其应用。开发新的用于CCUS的材料和技术是... 详细信息

对比分析了吸收和吸附、化学链燃烧和低温蒸馏、基于水合物的分离和膜分离等用于CO_(2)捕集、利用与封存(CCUS)方法的优缺点,溶剂吸收法的高能量需求、溶剂的损失和降解、腐蚀性和毒性等限制了其应用。开发新的用于CCUS的材料和技术是未来研究方向,其中各类离子液体及其复配溶剂可用于高效、经济地从气体流中分离出CO_(2)。综述了离子液体用于CO_(2)捕集的研究进展,并与各种传统方法进行了比较。介绍了YNDC离子液体的技术原理、方案以及工业化试验与发展目标,YNDC离子液体用于CO_(2)捕集具有吸收负荷高、再生能耗低、热稳定性高及腐蚀性低等特点,在CO_(2)化学吸收法捕集工艺中具有较大的应用前景。

关键词： CO_(2)捕集离子液体再生能耗化学吸收法

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