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IAP's Solar-Powered Unmanned Surface Vehicle Actively Passes through the Center of typhoon Sinlaku(2020) 被引量:3
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作者 Hongbin CHEN Jun LI +6 位作者 Wenying HE Shuqing MA Yingzhi WEI Jidong PAN Yu ZHAO Xuefen ZHANG Shuzhen HU 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2021年第4期538-545,共8页
The solar-powered marine unmanned surface vehicle(USV) developed by the USV team of the Institute of Atmospheric Physics is a rugged, long-duration, and autonomous navigation vessel designed for the collection of long... The solar-powered marine unmanned surface vehicle(USV) developed by the USV team of the Institute of Atmospheric Physics is a rugged, long-duration, and autonomous navigation vessel designed for the collection of longrange, continuous, real-time, meteorological and oceanographic measurements, especially under extreme sea conditions(sea state 6–7). These solar-powered USVs completed a long-term continuous navigation observation test over 26 days.During this time, they coordinated double-USV observations and actively navigated into the path of Typhoon Sinlaku(2020) before collecting data very close to its center during the 2020 USV South China Sea Typhoon Observation Experiment. Detailed high temporal resolution(1 min) real-time observations collected by the USV on the typhoon were used for operational typhoon forecasting and warning for the first time. As a mobile meteorological and oceanographic observation station capable of reliable, automated deployment, data collection, and transmission, such solar-powered USVs can replace traditional observation platforms to provide valuable real-time data for research, forecasting, and early warnings for potential marine meteorological disasters. 展开更多
关键词 solar-powered unmanned surface vehicle TYPHOON meteorological and oceanographic observation
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Flight strategy optimization for high-altitude long-endurance solar-powered aircraft based on Gauss pseudo-spectral method 被引量:18
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作者 Shaoqi WANG Dongli MA +2 位作者 Muqing YANG Liang ZHANG Guanxiong LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第10期2286-2298,共13页
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 signif... 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. 展开更多
关键词 Battery PACK FLIGHT strategy optimization GAUSS pseudo-spectral method PHOTOVOLTAIC cell solar-powered aircraft
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General optimal design of solar-powered unmanned aerial vehicle for priority considering propulsion system 被引量:4
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作者 Xinhua LI Kaijun SUN Feng LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第8期2176-2188,共13页
This paper describes the general optimization design method of Solar-Powered Unmanned Aerial Vehicle which priority considering propulsion system planning. Based on the traditional solar powered aircraft design method... This paper describes the general optimization design method of Solar-Powered Unmanned Aerial Vehicle which priority considering propulsion system planning. Based on the traditional solar powered aircraft design method, the propulsion system top-level target parameters which affect the path planning are integrated into the general optimization design. According to the typical mission requirements of Solar-Powered Unmanned Aerial Vehicle, considering the design variables such as wing area, aspect ratio, design mission date and so on, the general optimization is carried out with the minimum aircraft weight as the optimization objective. The influence of wing area and aspect ratio on the optimal design results is analyzed and compared with the traditional design method. The results show that the general design method of Solar-Powered Unmanned Aerial Vehicle for priority considering propulsion system can greatly reduce the electricity demand of energy storage battery, greatly reduce the aircraft weight of Solar-Powered Unmanned Aerial Vehicle. 展开更多
关键词 Aircraft design optimization General design technology Route analysis solar-powered Unmanned aerial vehicle
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Highly efficient and stable solar-powered desalination by tungsten carbide nanoarray film with sandwich wettability 被引量:2
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作者 Nana Han Kai Liu +10 位作者 Xinping Zhang Meng Wang Pan Du Zhaohui Huang Daojin Zhou Qian Zhang Tengfei Gao Yin Jia Liang Luo Jianjun Wang Xiaoming Sun 《Science Bulletin》 SCIE EI CAS CSCD 2019年第6期391-399,共9页
Solar-powered desalination is a promising way to resolve the worldwide water crisis for its low con- sumption and simple facility. Considering the fragility and aggregations of traditional materials, which may decreas... Solar-powered desalination is a promising way to resolve the worldwide water crisis for its low con- sumption and simple facility. Considering the fragility and aggregations of traditional materials, which may decrease efficiency, we herein introduce a robust tungsten carbide (WC) nanoarray film as a stable and efficient photothermal material, whose absorption is over 97.5% throughout almost the whole solar spectrum range (220–2200 nm) due to nanoarray structure and thus enhanced localized surface plasmon resonance. Besides, for the first time, we modified the film with sandwich wettability. It accelerates evap- oration by reducing water’s reflection of light, enlarging hydrophobic-hydrophilic boundaries, and depressing heat dissipation. Combining high absorption with unique wettability, the WC nanoarray film offers high solar-to-vapor efficiency of 90.8% and produces drinking water at the rate of (1.06 ± 0.10) kg m^(-2)h^(-1)from man-made seawater and (0.98 ± 0.18) kg m^(-2)h^(-1)from heavy metal sewage under one sun (AM 1.5) while 98% performance remains after 1 h×100 times’ reutilization. 展开更多
关键词 solar-powered DESALINATION Tungsten CARBIDE Nanoarray SANDWICH WETTABILITY Surface PLASMON resonance
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Mission-oriented cooperative 3D path planning for modular solar-powered aircraft with energy optimization 被引量:3
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作者 Xiangyu WANG Yanping YANG +1 位作者 Dong WANG Zijian ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第1期98-109,共12页
Modular Solar-Powered Aircraft(M-SPA)is a kind of High-Altitude Long-Endurance(HALE)aircraft which exploits the mission advantage of swarm UAV and the HALE advantage of large aspect-ratio SPA.M-SPA’s separated mode a... Modular Solar-Powered Aircraft(M-SPA)is a kind of High-Altitude Long-Endurance(HALE)aircraft which exploits the mission advantage of swarm UAV and the HALE advantage of large aspect-ratio SPA.M-SPA’s separated mode and combined mode give it the potential to maximize the mission efficiency with limited solar energy.In this paper,firstly,oriented by the mission of maximizing the cruise area,the overall design of the M-SPA is modeled,including the energy model,the aerodynamic model and the flight environment settings.Secondly,by analyzing the energy consumption of the flight modes,we design a multi-phase flight mission strategy.Then,a 24-hour three-dimensional(3D)flight profile of the M-SPA is optimized,including the sub-SPA cooperative path planning in the separation mode.Finally,inspired by the Traveling Salesman Problem(TSP),an improved Ant Colony Algorithm(ACA)is exploited to find the optimal path for each sub-SPA,which is further developed into a dynamic separation and combination scheme for the M-SPA.The simulation results show that the mission performance of the M-SPA outperforms that of the conventional SPA,and explicitly,the mission coverage of the M-SPA is slightly less than a linear increase under comparable simulation conditions. 展开更多
关键词 3D path planning Ant colony optimization Energy optimization Modular solar-powered Aircraft(M-SPA) Separated and combined strategy
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Integrated batteries layout and structural topology optimization for a solar-powered drone 被引量:2
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作者 Zijian ZHANG Ruitong ZHANG +3 位作者 Jihong ZHU Tong GAO Fei CHEN Weihong ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第7期114-123,共10页
The purpose of this paper is to demonstrate an integrated optimization scheme for a solar-powered drone structure.Consider a primary beam in the wing of large aspect ratio,where 100 lithium batteries are assembled.In ... The purpose of this paper is to demonstrate an integrated optimization scheme for a solar-powered drone structure.Consider a primary beam in the wing of large aspect ratio,where 100 lithium batteries are assembled.In the proposed integrated optimization,the batteries are considered here as parts of the load-carrying structure.The corresponding mechanical behaviors are simulated in the structural design and described with super-elements.The batteries layout and the structural topology are then introduced as mixed design variables and optimized simultaneously to achieve an accordant load-carrying path.Geometrical nonlinearity is considered due to the large deformation.Different periodic structural configurations are tested in the optimization in order to meet the structural manufacturing and assembly convenience.The optimized designs are rebuilt and tested in different load cases.Maintaining the same structural weight,the global mechanical performances are improved greatly compared with the initial design. 展开更多
关键词 Geometrical nonlinearity Integrated optimization Lithium batteries layout Periodic structural configuration solar-powered drone Wing beam structure
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Study on cyclic characteristics of the solar-powered adsorption cooling system 被引量:1
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作者 JingYi Wu Sheng Li YanFei Hu 《Science China(Technological Sciences)》 SCIE EI CAS 2009年第6期1551-1562,共12页
According to the typical variable heat source of solar energy and the unsteady adsorption process of adsorption chiller,the research of cyclic transient characteristics of the solar-powered adsorption cooling system i... According to the typical variable heat source of solar energy and the unsteady adsorption process of adsorption chiller,the research of cyclic transient characteristics of the solar-powered adsorption cooling system is presented in this work.A mathematic model of the whole system including the model of adsorption chiller,which reveals the transient operation process of the solar-powered adsorption cooling system,is developed and verified by experimental data.On the basis of the simulated results,the transient characteristics and the overall performance of the system,not only in the traditional open cycle mode but also in closed cycle mode,are both analyzed theoretically.Furthermore,the influence of parameters matching of components configuration and operation process on the cyclic characteristics of the system,such as the solar collector area,the water tank capacity and the chiller startup temperature,are discussed.The research in this work may play a very important role in optimizing the system cyclic process and improving the system adaptability especially under the condition of variable heat source. 展开更多
关键词 solar-powered cooling system ADSORPTION CHILLER UNSTEADY state CYCLIC CHARACTERISTICS
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Tree‑Inspired Structurally Graded Aerogel with Synergistic Water,Salt,and Thermal Transport for High‑Salinity Solar‑Powered Evaporation
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作者 Xiaomeng Zhao Heng Zhang +3 位作者 Kit‑Ying Chan Xinyue Huang Yunfei Yang Xi Shen 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第11期19-37,共19页
Solar-powered interfacial evaporation is an energy-efficient solution for water scarcity.It requires solar absorbers to facilitate upward water transport and limit the heat to the surface for efficient evaporation.Fur... Solar-powered interfacial evaporation is an energy-efficient solution for water scarcity.It requires solar absorbers to facilitate upward water transport and limit the heat to the surface for efficient evaporation.Furthermore,downward salt ion transport is also desired to prevent salt accumulation.However,achieving simultaneously fast water uptake,downward salt transport,and heat localization is challenging due to highly coupled water,mass,and thermal transport.Here,we develop a structurally graded aerogel inspired by tree transport systems to collectively optimize water,salt,and thermal transport.The arched aerogel features root-like,fan-shaped microchannels for rapid water uptake and downward salt diffusion,and horizontally aligned pores near the surface for heat localization through maximizing solar absorption and minimizing conductive heat loss.These structural characteristics gave rise to consistent evaporation rates of 2.09 kg m^(-2) h^(-1) under one-sun illumination in a 3.5 wt%NaCl solution for 7 days without degradation.Even in a high-salinity solution of 20 wt%NaCl,the evaporation rates maintained stable at 1.94 kg m^(-2) h^(-1) for 8 h without salt crystal formation.This work offers a novel microstructural design to address the complex interplay of water,salt,and thermal transport. 展开更多
关键词 Composite aerogel Graded structure solar-powered evaporation Thermal insulation Salt rejection
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Biologging is suspect to cause corneal opacity in two populations of wild living Northern Bald Ibises (Geronticus eremita)
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作者 Johannes Fritz Barbara Eberhard +6 位作者 Corinna Esterer Bernhard Goenner Daniela Trobe Markus Unsoeld Bernhard Voelkl Helena Wehner Alexandra Scope 《Avian Research》 CSCD 2020年第4期412-420,共9页
Background:In this paper,we present evidence that biologging is strongly correlated with eye irritation,with sometimes severely impairing effects.A migratory population of the Northern Bald Ibis(Geronticus eremita,NBI... Background:In this paper,we present evidence that biologging is strongly correlated with eye irritation,with sometimes severely impairing effects.A migratory population of the Northern Bald Ibis(Geronticus eremita,NBI)is reintroduced in Europe,in course of a LIFE+project.Since 2014,all individuals have been equipped with GPS-devices.Remote monitoring allows the implementation of focussed measures against major mortality causes.Methods:Initially all birds carried battery-powered devices,fixed on the lower back of the birds.Since 2016 an increasing amount of birds has been equipped with solar-powered devices,fixed on the upper back,the more sunexposed position.In 2016,we observed opacity in the cornea of one eye(unilateral corneal opacity;UCO)during a regular health monitoring for the first time.Results:By 2018,a total of 25 birds were affected by UCO,with varying intensity up to blindness.Clinical examination of the birds revealed no clear cause for the symptoms.However,only birds carrying a device on the upper back were affected(2017 up to 70%of this group).In contrast,none of the birds carrying devices on the lower back ever showed UCO symptoms.This unexpected relationship between tagging and UCO was discovered in 2017.After we took countermeasures by removing the device or repositioning it on the lower back,we observed an immediate reduction of the incidence rate without any new cases reported since January 2019.NBI roost with their head on the back,one eye closely placed to the device if it was positioned on the upper back.Thus,we conclude that the most parsimonious explanation for the symptomatology is either a repetitive slight temperature rise in the corneal tissue due to electromagnetic radiation by the GSM module of the device or a repetitive slight mechanical irritation of the corneal surface.Concrete evidence is missing so far.Meanwhile,cases of UCO were found in another NBI population.Conclusion:Our observations indicate that further research in the fast-growing field of biologging is urgently needed.The findings question the positioning of devices on the upper back in birds roosting with the head on the back. 展开更多
关键词 BLINDNESS Electromagnetic radiation Endangered bird species Eye opacity GPS-devices Mechanical irritation REINTRODUCTION solar-powered
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Optimization of Desiccant Absorption System Using a Genetic Algorithm
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作者 Ayman A. Aly 《Journal of Software Engineering and Applications》 2011年第9期527-533,共7页
Optimization of the open absorption desiccant cooling system has been carried out in the present work. A finite difference method is used to simulate the combined heat and mass transfer processes that occur in the liq... Optimization of the open absorption desiccant cooling system has been carried out in the present work. A finite difference method is used to simulate the combined heat and mass transfer processes that occur in the liquid desiccant regenerator which uses calcium chloride (CaCl2) solution as the working desiccant. The source of input heat is assumed to be the total radiation incident on a tilted surface. The system of equations is solved using the Matlab-Simulink platform. The effect of the important parameters, namely the regenerator length, desiccant solution flow rate and concentration, and air flow rates, on the performance of the system is investigated. In order to optimize the system performance, a genetic algorithm technique has been applied. The system coefficient of performance COP has been maximized for different design parameters. It has been found that the maximum values of COP could be obtained for different combinations of regenerator length solution flow rate and air flow rate. Therefore, it is essential to select the design parameters for each ambient condition to maximize the performance of the system. 展开更多
关键词 GENETIC Algorithm MODELING OPTIMIZATION solar-powered DESICCANT
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