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Resonance mechanism of flapping wing based on fluid structure interaction simulation

Chinese Journal of Aeronautics 2024年第5期37卷 243-262页

作者： Yueyang GUO Wenqing YANG Yuanbo dong dong XUE National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of AeronauticsNorthwestern Polytechnical UniversityXi'an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China Yangtze River Delta Research Institute of Northwestern Polytechnical University Taicang 215400China

Certain insect species have been observed to exploit the resonance mechanism of their *** order to achieve resonance and optimize aerodynamic performance,the conventional approach is to set the flapping frequency of flexible wings based on the Traditional Structural Modal(TSM)***,there exists controversy among researchers regarding the relationship between frequency and aerodynamic *** that the structural response of wings can be influenced by the surrounding air vibrations,an analysis known as Acoustic Structure Interaction Modal(ASIM)is introduced to calculate the resonant *** this study,Fluid Structure Interaction(FSI)simulations are employed to investigate the aerodynamic performance of flapping wings at modal frequencies derived from both TSM and ASIM *** performance is evaluated for various mass ratios and frequency ratios,and the findings indicate that the deformation and changes in vortex structure exhibit similarities at mass ratios that yield the highest aerodynamic ***,the flapping frequency associated with the maximum time-averaged vertical force coefficient at each mass ratio closely aligns with the ASIM frequency,as does the frequency corresponding to maximum ***,the ASIM analysis can provide an effective means for predicting the optimal flapping frequency for flexible ***,it enables the prediction that flexible wings with varying mass ratios will exhibit similar deformation and vortex structure *** paper offers a fresh perspective on the ongoing debate concerning the resonance mechanism of Flexible Flapping Wings(FFWs)and proposes an effective methodology for predicting their aerodynamic performance.

关键词： Flexible Flapping Wing(FFW) Acoustic Structure Interaction Modal(ASIM) Fluid Structure Interaction(FSI) Resonance mechanism Aerodynamic performance

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Interaction Study of Guest with Host in Clathrate Hydrate

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Journal of Natural Gas Chemistry 2007年第4期16卷 423-427页

作者： Shunle dong Physics Department College of Information Science and Engineering Ocean University of ChinaQingdao 266100ShandongChina

Lattice dynamical simulations of noble gas hydrate structures I and II have been performed. Potential energies were investigated to study the influence of guest species on the stability of the hydrate structure. Results show that when the diameter of inclusion molecules is between 3 A and 4.2 A, such as Ar and Kr, the critical role of the 512 cage in the stabilization of hydrates becomes effective. For Xe hydrates SI and SII, with the help of lattice dynamical calculations, the modes attributions are identified directly. We proposed the resonant effect of the fingerprint frequency at about 7 meV and 10 meV which arise from the coupling of Xe molecules in the 512 cage with the host lattice.

关键词： clathrate hydrate He Ne Ar Kr Xe lattice dynamical simulation

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On a Hybrid of Bilinear Hilbert Transform and Paraproduct

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Acta Mathematica Sinica,English Series 2018年第1期34卷 29-41页

作者： dong dong Xiao Chun LI Mathematics Department University of Illinois at Urbana-Champaign

We introduce a class of tri-linear operators that combine features of the bilinear Hilbert transform and paraproduct. For two instances of these operators, we prove boundedness property in alarge range D ={（p1,p2,p3... 详细信息

关键词： Bilinear Hilbert transform paraproduct tri-linear operators

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A Class of Finite-Dimensional Representations of U_q(sl_2)

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Acta Mathematica Sinica,English Series 2013年第9期29卷 1703-1712页

作者： dong Ming CHENG dong SU Department of Mathematics and Applied Mathematics He'nan University of Science and Technology

In order to study a class of finite-dimensional representations of Uq（sl2）, we deal with the quotient algebra Uq （m, n, b） of quantum group Uq（sl2） with relations Kr=1, Emr=b, Fnr=0 in this paper, where q is a root of unity. The algebra Uq（m, n, b） is decomposed into a direct sum of indecomposable （left） ideals. The structures of indecomposable projective representations and their blocks are determined.

关键词： Quantum group representation root of unity

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A New α Ti Alloy (Ti-4Al-2V) for Marine Engineering

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Journal of Materials Science & Technology 2001年第1期17卷 77-78页

作者： dong LI NW Inst Nonferrous Met Res Xian 710016 Peoples R China

NIN has developed a new type of Ti alloy. It is suitable for structure pieces applied in hightemperature and high-pressure water/steam conditions. Its nominal composition is Ti-4Al-2V. In this paper, its microstructu... 详细信息

关键词： Ti-4Al-2V Al for Marine Engineering

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On Strong Kadison–Singer Algebras

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Acta Mathematica Sinica,English Series 2013年第12期29卷 2219-2232页

作者： Ai Ju dong dong WANG School of Mathematics and Computer Engineering Xi’an University of Arts and Science Institute of Mathematics Academy of Mathematics and Systems Science Department of Mathematics and Statistics University of New Hampshire

We show that many Kadison-Singer algebras are maximal triangular in all algebras containing them although their definition requires the maximality taken in the class of reflexive algebras. Diagonal-trivial maximal non... 详细信息

关键词： Kadison-Singer algebra Kadison-Singer lattice reflexive algebra double triangle lattice von Neumann algebra

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Influence of Blade Outlet Angle on Inner Flow Field of Centrifugal Pump Transporting Salt Aqueous Solution

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Chinese Journal of Mechanical Engineering 2009年第6期22卷 912-917页

作者： YANG Minguan KANG Can dong Xiang LIU dong School of Energy and Power Engineering Jiangsu University Zhenjiang 212013 China

During transportation of salt aqueous solutions with centrifugal pump, crystallization phenomenon is frequently encountered. For this kind of two-phase flow, it is difficult to be accurately modeled since there are various medium properties and phase change characteristics. In view of experiment, several problems are hampering the implementation of precise measurement. Influences of blade outlet angle and medium temperature on crystallization rate were studied. Sodium sulfate solution was applied to simulate practical fluid in chemical industry. Particle image velocimetry（PIV） was employed to measure velocity distributions in rotating impeller. Crystallization processes in three impellers with different blade outlet angles were investigated. Relations among crystallization and flow parameters such as temperature and velocity were obtained. With the same blade wrap angle, when blade outlet angle is larger, diffusion of single flow passage gets stronger, relative velocity at blade outlet decreases and large scale vortex tends to appear near the blade working surface. For the impact of volume effect of particle phase on fluid viscosity, both liquid and solid phase velocities decrease with continual forming and growing of crystal particles. Velocity of solid phase is greater than that of liquid phase and its direction leans more closely to blade working surface. Solid particles tend to move towards blade working surface, as is more obvious in the impeller with large blade outlet angle. Therefore, collision between solid particles with stem part of blade working surface is more intensive in impeller with large blade outlet angle. Concerning transportation of salt aqueous solution, accurate PIV measurement is conducted in centrifugal impellers with different blade outlet angles. The results are useful and instructive in relevant engineering design and operation.

关键词： centrifugal pump flow with crystallization blade outlet angle particle image velocimetry(PIV)

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Impact of Antecedent Soil Moisture Anomalies over the Indo-China Peninsula on the Super Meiyu Event in 2020

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Journal of Meteorological Research 2023年第2期37卷 234-247页

作者： Yinshuo dong Haishan Chen Xuan dong Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science&TechnologyNanjing210044 School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing210044

In the summer of 2020,a super Meiyu event occurred in the Yangtze River basin(YRB),causing enormous economic losses and human *** studies have investigated the possible causes of this super Meiyu event from the perspective of anomalous atmospheric circulation activities and sea surface temperature(SST)anomalies;however,the influence of land surface processes has not garnered considerable *** study investigates the possible contributions of land surface processes to this extreme event based on observational analysis and numerical simulations,and shows that antecedent soil moisture(SM)anomalies over the Indo-China Peninsula(ICP)may have had a vital influence on the super Meiyu in *** SM anomalies in May over the ICP increased the surface temperature and sensible heat ***“memory”of soil allowed the anomalies to persist into the Meiyu *** heating of the lower atmosphere by the surface strengthened the western Pacific subtropical high,which caused an anomalous anticyclone from the ICP to Northwest Pacific and thus enhanced the southwesterly winds and vertical motion over the ***,the water vapor flux and convergence were *** experiments based on the Weather Research and Forecasting(WRF)model further confirmed the results of observational analysis and indicated that the warm air heated by the ICP surface significantly warmed the lower troposphere from the ICP to Northwest Pacific under the influence of the background wind,thus increasing the geopotential height and inducing an *** results of the sensitivity experiments showed that the SM anomalies in May over the ICP increased the precipitation by 10.6%from June to July over the *** findings can improve our understanding of the mechanism of the super Meiyu event in 2020 and facilitate the prediction of extreme Meiyu events.

关键词： super Meiyu soil moisture Indo-China Peninsula surface heating

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Microstructure evolution and thermal physical properties of CuCr alloy after high pressure treatment

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Rare Metals 2014年第3期33卷 293-298页

作者： Yu-Quan Ma Hong-ju Lin dong-dong SongMechanical and Electrical Engineering College Hebei Normal University of Science and Technology

The thermal diffusion coefficient, thermal conductivity, and thermal expansion coefficient of CuCr alloy prepared by infiltration were measured by thermal constant tester and dilatometer before and after high pressure heat treatment, at the same time, the effect of high pressure treatment on the thermal physical properties of CuCr alloy was discussed by the analysis of its microstructure. The experimental results show that high pressure heat treatment can increase the thermal diffusion coefficient and thermal conductivity of CuCr alloy, but it changes slightly in the pressure range of 1-6 GPa. As for thermal expansion coefficient, when the temperature is higher than 130 °C, it is obviously higher than that of the alloy without high pressure treatment after 1 GPa pressure treatment, and the higher the temperature is, the larger their differences are.

关键词： CuCr alloy High pressure treatment Thermaldiffusion coefficient Thermal conductivity Thermalexpansion coefficient

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法压式冲泡对海南罗布斯塔咖啡感官品质的影响

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食品科学 2025年第1期46卷 108-120页

作者：刘迪劳菲董文江于鑫欣中国农业大学食品科学与营养工程学院国家果蔬加工工程技术研究中心农业农村部果蔬加工重点实验室北京市食品非热加工重点实验室北京100083 中国热带农业科学院香料饮料研究所海南万宁571533 海南省特色热带作物适宜性加工与品质控制重点实验室国家重要热带作物工程技术研究中心海南万宁571533

以中度烘焙海南罗布斯塔咖啡为研究对象,制备可溶性固形物质量分数为2%的法压式咖啡,采用喜好度评价对4种冲泡参数进行单因素和响应面试验优化,通过感官定量描述分析结合气相色谱-质谱联用法、超高效液相色谱法挖掘咖啡喜好度与其感官... 详细信息

以中度烘焙海南罗布斯塔咖啡为研究对象,制备可溶性固形物质量分数为2%的法压式咖啡,采用喜好度评价对4种冲泡参数进行单因素和响应面试验优化,通过感官定量描述分析结合气相色谱-质谱联用法、超高效液相色谱法挖掘咖啡喜好度与其感官特性及风味物质之间的相关性信息。结果表明,咖啡萃取质量浓度会随着咖啡粒径减小、粉水比增加、冲泡水温升高或冲泡时间延长而显著增大(P<0.05)。咖啡喜好度(0~6分,七点法)在粉水比1∶5(m/m)、研磨度8、冲泡水温92℃、冲泡6min时达到最高(3.3±1.6)。咖啡中共检测出78种挥发性成分,通过气味活性值分析得大马士酮、3-乙基-2,5-甲基吡嗪等关键香气化合物10种。Pearson相关性分析表明,喜好度与咖啡的圆润感、巧克力香属性呈正相关,与咖啡因、具有丁香味和酚味的4-乙基愈创木酚、4-乙烯基愈创木酚及具有粪臭味的3-甲基吲哚呈负相关。本研究能为挖掘海南罗布斯塔咖啡的风味喜好及其物质基础提供一定理论依据。

关键词：罗布斯塔咖啡冲泡参数感官定量描述分析气相色谱-质谱联用 Pearson相关性

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