|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Flight strategy optimization for high-altitude long-endurance solar-powered aircraft based on Gauss pseudo-spectral method显示文摘Solar-powered aircraft have attracted great attention owing to their potential for longendurance flight and wide application prospects.Due to the particularity of energy system,flight strategy optimization is a significant way to enhance the flight performance for solar-powered aircraft.In this study,a flight strategy optimization model for high-altitude long-endurance solar-powered aircraft was proposed.This model consists of three-dimensional kinematic model,aerodynamic model,energy collection model,energy store model and energy loss model.To solve the nonlinear optimal control problem with process constraints and terminal constraints,Gauss pseudo-spectral method was employed to discretize the state equations and constraint equations.Then a typical mission flying from given initial point to given final point within a time interval was considered.Results indicate that proper changes of the attitude angle contribute to increasing the energy gained by photovoltaic cells.Utilization of gravitational potential energy can partly take the role of battery pack.Integrating these two measures,the optimized flight strategy can improve the final state of charge compared with current constant-altitude constant-velocity strategy.The optimized strategy brings more profits on condition of lower sunlight intensity and shorter daytime. | Shaoqi WANG Dongli MA Muqing YANG Liang ZHANG Guanxiong LI | 2019 | Chinese Journal of Aeronautics2019，32，10： | 15 |
| 2 | Effects of relative thickness on aerodynamic characteristics of airfoil at a low Reynolds number显示文摘This study focuses on the characteristics of low Reynolds number flow around airfoil of high-altitude unmanned aerial vehicles(HAUAVs) cruising at low speed.Numerical simulation on the flows around several representative airfoils is carried out to investigate the low Reynolds number flow.The water tunnel model tests further validate the accuracy and effectiveness of the numerical method.Then the effects of the relative thickness of airfoil on aerodynamic performance are explored, using the above numerical method, by simulating flows around airfoils of different relative thicknesses(12%, 14%, 16%, 18%), as well as different locations of the maximum relative thickness(x/c = 22%, 26%, 30%, 34%), at a low Reynolds number of 5 · 105.Results show that performance of airfoils at low Reynolds number is mainly affected by the laminar separation bubble.On the premise of good stall characteristics, the value of maximum relative thickness should be as small as possible, and the location of the maximum relative thickness ought to be closer to the trailing edge to obtain fine airfoil performance.The numerical method is feasible for the simulation of low Reynolds number flow.The study can help to provide a basis for the design of low Reynolds number airfoil. | Ma Dongli Zhao Yanping Qiao Yuhang Li Guanxiong | 2015 | Chinese Journal of Aeronautics2015，28，4： | 13 |
| 3 | Dynamic simulation of aerial towed decoy system based on tension recurrence algorithm显示文摘Dynamic model of aerial towed decoy system is established and simulations are performed to research the dynamic characteristics of the system. Firstly, Kinetic equations based on spinor are built, where the cable is discretized into a number of rigid segments while the decoy is modeled as a rigid body hinged on the cable. Then tension recurrence algorithm is developed to improve computational efficiency, which makes it possible to predict the dynamic response of aerial towed decoy system rapidly and accurately. Subsequently, the efficiency and validity of this algorithm are verified by comparison with Kane's function and further validated by wind tunnel tests.Simulation results indicate that the distance between the towing point and the decoy's center of gravity is suggested to be 5%–20% of the length of decoy body to ensure the stability of system.In up-risen maneuver process, the value of angular velocity is recommended to be less than0.10 rad/s to protect the cable from the aircraft exhaust jet. During the turning movement of aircraft, the cable's extent of stretching outwards is proportional to the aircraft's angular velocity.Meanwhile, the decoy, aircraft and missile form a triangle, which promotes the decoy's performance. | Ma Dongli Wang Shaoqi Yang Muqing Dong Yongpan | 2016 | Chinese Journal of Aeronautics2016，29，6： | 5 |
| 4 | Numerical simulation of Gurney flap on SFYT15thick airfoil显示文摘A two-dimensional steady Reynolds-averaged Navier–Stokes(RANS) equation was solved to investigate the effects of a Gurney flap on SFYT15 thick airfoil aerodynamic performance. This airfoil was designed for flight vehicle operating at 20 km altitude with freestream velocity of 25 m/s. The chord length(C) is5 m and the Reynolds number based on chord length is Re = 7.76 × 105. Gurney flaps with the heights ranging from 0.25%C to 3%C were investigated. The shear stress transport(SST) k-ω turbulence model was used to simulate the flow structure around the airfoil. It is showed that Gurney flap can enhance not only the prestall lift but also lift-to-drag ratio in a certain range of angles of attack. Specially, at cruise angle of attack(α = 3°), Gurney flap with 0.5%C height can increase lift-to-drag ratio by 2.7%, and lift coefficient by 12.9%, respectively. Furthermore, the surface pressure distribution, streamlines and trailing-edge flow structure around the airfoil are illustrated, which are helpful to understand the mechanisms of Gurney flap on airfoil aerodynamic performance. Moreover, it is found that the increase of airfoil drag with Gurney flap can be attributed to the increase of pressure drag between the windward and the leeward sides of Gurney flap itself. | Xi He Jinjun Wang Muqing Yang Dongli Ma Chao Yan Peiqing Liu | 2016 | Theoretical & Applied Mechanics Letters2016，6，6： | 5 |
| 5 | Research on desorption and regeneration of simulated decarbonization solution in the process of CO_2 capture using ammonia method显示文摘Study on desorption and regeneration of simulated decarbonization solution using ammonia method for CO2 capture was carried out in order to understand the feature of regeneration of decarbonization solution. The mechanisms about solution desorption after decarbonization were introduced briefly. Under the atmospheric pressure and in the presence of nitrogen carrier gas, several effects related to desorption of simulated decarbonization solution were analyzed, such as temperature, solution concentration, pH, loading capacity, etc. The results showed that the CO2 desorption percentage increased with the increases of temperature, solution concentration and loading capacity, but CO2 desorption percentage increased with the increasing of pH and then decreased. | MA ShuangChen WANG MengXuan HAN TingTing CHEN WeiZhong LU DongLi CHEN GongDa | 2012 | Science China(Technological Sciences)2012，55，12： | 3 |
| 6 | 普通玉米、糯玉米和蒸汽压片玉米对生长猪能量和营养物质消化率的影响显示文摘研究的目的是通过饲喂生长猪普通玉米、糯玉米和蒸汽压片玉米来测定其消化能、代谢能和营养物质的表观消化率。 | 朱秋凤 张永静 温春雨 徐作鹏 Dongli Ma Juntao Li Chengfei Huang Fengjuan Yang Yi Wu Ling Liu Wei Jiang Zhicheng Jia Peijun Zhang Xuezhen Liu Shuai Zhang | 2021 | 猪业科学2021，38，3： | 3 |
| 7 | Numerical Simulation of Rotor-aerodynamic Surface Interaction in Hover Using Moving Chimera Grid显示文摘Three-dimensional unsteady Navier-Stokes equations are numerically solved to simulate the aerodynamic interaction of rotor, canard and horizontal tail in hover based on moving chimera grid. The variations of unsteady aerodynamic forces and moments of the canard and horizontal tail with respect to the rotor azimuth are analyzed with the deflection angle set at 0° and 50°, respectively. The pressure map of aerodynamic surfaces and velocity vector distribution of flow field are investigated to get better understanding of the unsteady aerodynamic interaction. The result shows that the canard and horizontal tail present different characteristics under the downwash of the rotor. The canard produces much vertical force loss with low amplitude fluctuation. Contrarily, the horizontal tail, which is within the flow field induced by the down wash of the rotor, produces only less vertical force loss, but the amplitudes of the lift and pitching moment are larger, implying that a potential deflection angle scheme in hover is 50° for the canard and 0° for the horizontal tail. | LI Yibo MA Dongli | 2012 | Chinese Journal of Aeronautics2012，25，3： | 3 |
| 8 | Numerical simulation of gurney flaps lift-enhancement on a low reynolds number airfoil显示文摘Two-dimensional steady Reynolds-averaged Navier-Stokes(RANS) equations with transition shear stress transport(SST) model were solved to investigate the effects of Gurney flaps on the aerodynamic performance of a low Reynolds number airfoil. This airfoil was designed for flight vehicles operating at 20 km altitude with freestream velocity of 25 m/s. The chord length(C) of this airfoil is 5 m and the corresponding Reynolds number is 7.76×10~5. Gurney flaps with the heights ranging from 0.25%C to3%C were investigated. It has been shown that Gurney flaps can enhance not only the prestall lift but also lift-to-drag ratio in a certain range of angles of attack. Specially, at cruise angle of attack(3°), Gurney flap with the height of 0.5%C.can increase lift-to-drag ratio and lift coefficient by 1.6% and 12.8%, respectively. Furthermore, the mechanisms of Gurney flaps to improve the aerodynamic performance were illustrated by analyzing the surface pressure distribution, streamlines and trailing-edge flow structure for this low Reynolds number airfoil. Specially, distinguished from some other numerical researches, the flow details such as the laminar separation bubble and transition phenomena for low Reynolds number airfoil with Gurney flaps were investigated and it was found that Gurney flaps can delay the transition onset position at small angles of attack(≤2°). However, with the increase of angles of attack, Gurney flaps will promote the boundary layer transition. | HE Xi WANG JinJun YANG MuQing MA DongLi YAN Chao LIU PeiQing | 2017 | Science China(Technological Sciences)2017，60，10： | 3 |
| 9 | Adaptive-surrogate-based robust optimization of transonic natural laminar flow nacelle显示文摘Natural Laminar Flow(NLF)technology is very effective for reducing the skin friction drag of aircraft engine nacelle,but the aerodynamic performance of NLF nacelle is highly sensitive to uncertain working conditions.Therefore,it’s imperative to incorporate uncertainties into the design of NLF nacelle.In this study,for a robust optimization of NLF nacelle and for improving its efficiency,an adaptive-surrogate-based robust optimization strategy is established,which is an iterative optimization process where the surrogate model is updated to obtain the real Pareto front of multi-objective optimization problem.A case study is carried out to validate its feasibility and effectiveness.The results show that the optimization increases the favorable pressure gradient region and the volume ratio of the nacelle by increasing its lip radius and reducing its maximum diameter.And the aerodynamic robustness of the NLF nacelle is mainly determined by the lip radius,maximum diameter of nacelle and location of the maximum diameter.Compared to the initial nacelle,the optimized nacelle maintains a wide range of low drag and high laminar flow ratio in the disturbance space,which extends the average laminar flow region to 21.6%and facilitates a decrease of 1.98 counts in the average drag coefficient. | Yuan YAO Dongli MA Muqing YANG Liang ZHANG Yang GUO | 2021 | Chinese Journal of Aeronautics2021，34，10： | 2 |
| 10 | Breakdown of shield gaps in vacuum interrupters显示文摘The objective of this paper is to determine how the high-voltage discharging metal vapour deposited on the nearby ceramic inner surface influences the breakdowns of gaps between centre shield and end shield in vacuum interrupters.Two types of shield materials were selected,namely copper and stainless steel.The end curvature radius of the shield was 3 mm.The distance between the shields could adjust manually from 4 to 8 mm.The distance between the shields and ceramic was 3.5 mm.The negative polarity standard lightning impulse voltage(12/50μs)was repeated for 900 operations based on an up-and-down method.The experimental results illustrated that the metal deposition layer on the inner surface of the ceramic en-velope significantly influenced the breakdown voltage of the shield gaps.At a shield gap distance of d?4 mm,the breakdown voltage of the shield gap increased from an initial lower voltage to the saturation voltage by approximately 200 operations.Then,the breakdown voltage decreased to a lower voltage range during only 50 operations,and the breakdown voltage maintained at this lower voltage range until the end of 900 operations.Furthermore,as the shield gap distance increased from d?4 to 6 mm and 8 mm,the breakdown voltage also maintained at this lower voltage range.A metal deposition layer was formed on the inner surface of ceramic by repetitive application of the lightning impulse voltage.To analyse the influence of the metal deposition layer,the electric field distributions were calculated for the original vacuum interrupter and the vacuum interrupter with the metal deposition layer on the ceramic inner surface.The simulation results suggested that the metal deposition layer took part in the breakdown path between the shield gaps and deteriorated the insulation performance. | Weigang Feng Zhiyuan Liu Hui Ma Yingsan Geng Jianhua Wang Lalian Li Dongli Bi | 2021 | High Voltage2021，6，4： | 2 |
| 11 | Discovery of carbon-based strongest and hardest amorphous material显示文摘Carbon is one of the most fascinating elements due to its structurally diverse allo tropic forms stemming from its bonding varieties(sp,sp^(2)and sp^(3)).Exploring new forms of carbon has been the eternal theme of scientific research.Herein,we report on amorphous(AM) carbon materials with a high fraction of sp^(3)bonding recovered from compression of fullerene C_(60) under high pressure and high temperature,previously unexplored.Analysis of photoluminescence and absorption spectra demonstrates that they are semiconducting with a bandgap range of 1.5-2.2 eV,comparable to that of widely used AM silicon.Comprehensive mechanical tests demonstrate that synthesized AM-Ⅲ carbon is the hardest and strongest AM material known to date,and can scratch diamond crystal and approach its strength.The produced AM carbon materials combine outstanding mechanical and electronic properties,and may potentially be used in photovoltaic applications that require ultrahigh strength and wear resistance. | Shuangshuang Zhang Zihe Li Kun Luo Julong He Yufei Gao Alexander V.Soldatov Vicente Benavides Kaiyuan Shi Anmin Nie Bin Zhang Wentao Hu Mengdong Ma Yong Liu Bin Wen Guoying Gao Bing Liu Yang Zhang Yu Shu Dongli Yu Xiang-Feng Zhou Zhisheng Zhao Bo Xu Lei Su Guoqiang Yang Olga P.Chernogorova Yongjun Tian | 2022 | National Science Review2022，9，1： | 2 |
| 12 | Comprehensive sizing and optimization method for series-hybrid unmanned convertiplane显示文摘This paper presents a novel sizing and optimization approach for the emerging serieshybrid unmanned convertiplane,which can be used to translate the top-level design requirements into the design parameters corresponding to the optimal power supply strategy and minimum total takeoff weight.The method comprehensively considers the design constraints in the rotor,fixedwing,and transition modes,and pays special attention to the characteristic response of Series Hybrid Electric System(S-HES)in complex application scenarios,especially the coupling of battery power,energy,and state-of-charge under high-power discharge conditions,the variation of fuel economy,and the adjustment of power supply strategy.With proposed method,it's possible to rapidly explore the design space in the initial design stage and find out the optimal design results with high confidence.A case study was proposed to verify the approach.The results reveal the particularity of convertiplane in terms of power requirements,and prove the necessity to consider detailed S-HES characteristic responses during parameter determination.The optimal design parameters were obtained through the hybrid control parameter optimization,which verified the effectiveness of proposed method.Possible errors and corresponding correction methods were also presented. | Gang CHEN Dongli MA Yuhong JIA Xinglu XIA Cheng HE | 2021 | Chinese Journal of Aeronautics2021，34，4： | 2 |
| 13 | Optimization and analysis of winglet configuration for solar aircraft显示文摘Installing winglets can notably improve the aerodynamic performance of solar aircraft.This paper proposes a multi-constraints optimization method of winglets for solar aircraft,aiming to enhance the corresponding uninterrupted cruising capability.An optimization objective function is formed and is separately studied in aerodynamic and structural terms.Qualitative analysis shows that the winglet design parameters are restricted by four special constraints(geometry,aerodynamics,energy and stability)of solar aircraft.The optimization process is constructed on the basis of a multi-island genetic algorithm,and carried out for a 15 m wingspan solar aircraft.Although the designed winglet is not as good as the traditional winglet in terms of drag and structural weight,the designed winglet provides a better 24 h cruising capability.The sensitivity between the objective function and the design parameters is investigated,and the winglet effects vary with respect to the wing aspect ratio(AR=10,15,19.6).The effect of the constraints is analysed quantitatively,and some basic laws are obtained.Moreover,the feasible design region and the possible optimal design parameters of winglets for different wing configurations are explored.The calculation results show that when the aspect ratio exceeds a certain value,the winglets will not benefit the aircraft. | Liang ZHANG Dongli MA Muqing YANG Shaoqi WANG | 2020 | Chinese Journal of Aeronautics2020，33，12： | 2 |
| 14 | Landscape Renovation Design of Huizhou Dockyard显示文摘By reviewing development history and current situation of Huizhou Dockyard,this paper took 'concentrated,scattered,changing' as the theme,adopted the design concepts of integrating functions and cultures,followed the principle of applicable,economical,beautiful,ecological and human-concerned,to build a comfortable urban park. | LIU Deliang MA Dongli | 2014 | Journal of Landscape Research2014，6，4： | 1 |
| 15 | Gas chromatography/ion trap mass spectrometry applied for the analysis of triazine herbicides in environmental waters by an isotope dilution technique显示文摘 | Zongwei Cai Dongli Wang W T Ma | 2004 | Analy Chim Acta2004，503，2： | 1 |
| 16 | Telocytes promote VEGF expression and alleviate ventilator-induced lung injury in mice显示文摘 | Ruihua Ma Pinwen Wu Qiqing Shi Dongli Song Hao Fang | 2018 | Acta Biochimica et Biophysica Sinica2018，50，8： | 1 |
| 17 | Heat-treated glassy carbon under pressure exhibiting superior hardness,strength and elasticity显示文摘Glassy carbon(GC)is a type of non-graphitizing disordered carbon material at ambient pressure and high temperatures,which has been widely used due to its excellent mechanical properties.Here we report the changes in the microstructure and mechanical properties of GC treated at high pressures(up to 5 GPa)and high temperatures.The formation of intermediate sp2-sp3 phases is identified at moderate treatment temperatures before the complete graphitization of GC,by analyzing synchrotron X-ray diffraction,Raman spectra,and transmission electron microscopy images.The intermediate metastable carbon materials exhibit superior mechanical properties with hardness reaching up to 10 GPa and compressive strength reaching as high as 2.5 GPa,nearly doubling those of raw GC,and improving elasticity and thermal stability.The synthesis pressure used in this study can be achieved in the industry on a commercial scale,enabling the scalable synthesis of this type of strong,hard,and elastic carbon materials. | Meng Hu Shuangshuang Zhang Bing Liu Yingju Wu Kun Luo Zihe Li Mengdong Ma Dongli Yu Lingyu Liu Yufei Gao Zhisheng Zhao Yoshio Kono Ligang Bai Guoyin Shen Wentao Hu Yang Zhang Ralf Riedel Bo Xu Julong He Yongjun Tian | 2021 | Journal of Materiomics2021，7，1： | 1 |
| 18 | Gas Chromatography/Ion Trap Mass Spectrometry Applied for the Analysis of Triazine Herbicides in Environmental Waters by an Isotope Dilution Technique显示文摘 | Zongwei Cai Dongli Wang W T Ma | 2004 | Analy Chim Acta2004，503，2： | 1 |
| 19 | Extraordinary high-temperature mechanical properties in binder-free nanopolycrystalline WC ceramic显示文摘From the perspective of high-temperature applications,materials with excellent high-temperature mechanical properties are always desirable.The present work demonstrates that the binder-free nanopolycrystalline WC ceramic with an average grain size of 103 nm obtained by high-pressure and hightemperature sintering exhibits excellent mechanical properties at both room temperature and high temperature up to 1000℃.Specifically,the binder-free nanopolycrystalline WC ceramic still maintains a considerably high Vicker hardness H_(V)of 23.4 GPa at 1000℃,which is only 22%lower than the room temperature H_(V).This outstanding thermo-mechanical stability is superior to that of typical technical ceramics,e.g.SiC,Si_(3)N_(4),Al_(2)O_(3),etc.Nanocrystalline grains with many dislocations,numerous low-energy,highly stableΣ2 grain boundaries,and a relatively low thermal expansion coefficient,are responsible for the observed outstanding high-temperature mechanical properties. | Hongfeng Dong Baozhong Li BoBo Liu Yang Zhang Lei Sun Kun Luo Yingju Wu Mengdong Ma Bing Liu Wentao Hu Julong He Dongli Yu Bo Xu Zhisheng Zhao Yongjun Tian | 2022 | Journal of Materials Science & Technology2022，，2： | 1 |
| 20 | Optimization and analysis of composite sandwich box beam for solar drones显示文摘Solar drones have garnered considerably research attention in recent years due to their continuous cruising capability,and the feasibility of design schemes is sensitive to the weight of structure.Sandwich box beam composed of carbon fiber and polymethacrylimide(PMI)foam is conducive to realize the lightweight of structure.In this study,a two-stage optimization design methodology for sandwich box beam is proposed.This methodology is primarily based on a low-order analytical method for evaluating stress/deflection and the linear buckling analysis method combined with experimental correction factor for predicting the buckling eigenvalues.Subsequently,a case study was conducted using an 18-m wingspan solar drone,where the results of mechanical test verified the optimization results.For validating the use of sandwich box beam in solar drones of other scales,additional analysis was conducted based on three aspects:(A)effects of stiffness and stability constraints on the design of sandwich box beam;(B)crucial role of the weight of foam inter layer and application scope of sandwich box beam;(C)best method to improve the buckling eigenvalue of sandwich box beam.Overall,the methodology and general rules presented in this paper can support the design of light wing beam for solar drones. | Liang ZHANG Dongli MA Muqing YANG Xinglu XIA Yuan YAO | 2021 | Chinese Journal of Aeronautics2021，34，10： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员