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Turning mechanism and composite control of stratospheric airships

Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第11期13卷 859-865页

作者： Mao-hua ZHANG Deng-ping DUAN Li CHEN Institute of Aerospace Science and Technology Shanghai Jiao Tong UniversityShanghai 200240China Institute of Aerospace Science and Technology Center of Ministry of Education Shanghai 200240China

The parametric model of stratospheric airships is established in the body axes coordinate system. In this paper we study the turning mechanism of stratospheric airships including the generated forces and the key parameters for steady turning. We compare and analyze the different driven-characteristics between aerodynamic control surfaces and vectored thrust in turning. We design a composite control combining aerodynamic control surfaces and vectored thrust according to different dynamic pressure conditions, to achieve coordinated turning under high or low airspeed situations.

关键词： stratospheric airships Horizontal turn Composite control Control allocation Vectored thrust

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Height Variation in the Summer Quasi-Zero Wind Layer over Dunhuang, Northwest China: A Diagnostic Study

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Journal of Meteorological Research 2022年第4期36卷 618-630页

作者： Yi YUAN Yi LIU Lingkun RAN Hua ZHANG School of Environmental Studies China University of GeosciencesWuhan 430074 Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029 State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081

This study investigates the variation in the stratospheric quasi-zero wind layer(QZWL)over Dunhuang,Gansu Province,China,on 9 August 2020 using sounding observations from the Dunhuang national reference station and the fifth generation of ECMWF atmospheric reanalysis data(ERA5).The QZWL over Dunhuang was located between 18.6 and 20.4 km on 9 August *** South Asian high(SAH)and subtropical westerly jet jointly affected the *** the SAH retreated westward,the upper-level westerly jet over Dunhuang strengthened,and the jet axis height *** a result,the zonal westerly wind was lifted to a higher altitude,and the wind speed of 100–70 hPa increased,raising the *** addition,the east–west oscillation of the SAH occurred earlier than the adjustment of the QZWL altitude,which can be used as a forecasting indicator for the *** further explore the mechanism responsible for the QZWL adjustment,the forcing terms in the equations for zonal wind,kinetic energy,and vertical wind shear were *** results showed that the upper-level geopotential gradient was the basic physical factor forcing the local change in zonal wind and kinetic *** change in zonal wind and kinetic energy led to the uplift of the *** results revealed that the vertical shear of horizontal wind could adequately indicate the stratospheric QZWL location.

关键词： stratospheric quasi-zero wind layer stratospheric airships South Asian high

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维普期刊数据库

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Optimization of stratospheric Airship Station-Keeping Strategy Based on LSTM-DQN Algorithm

Optimization of Stratospheric Airship Station-Keeping Strate...

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第43届中国控制会议

作者： Xiangrui Meng Zhibin Li Deping He Shandong University of Science and Technology

stratospheric airships serve as crucial platforms for conducting applications in near space,and achieving their long-term station-keeping in high-altitude regions has been a focal point of *** study employs deep reinforcement learning,specifically integrating Long Short-Term Memory networks(LSTM) with Deep Q-networks(DQN) – referred to as LSTM-DQN – to enhance the station-keeping strategy of stratospheric airships within intricate wind *** leveraging predicted wind speed information,the research successfully realizes prolonged and effective residence in a target *** results demonstrate that,during the algorithm training process,the airship's control strategy progressively transitions to a more robust residence strategy,significantly enhancing residence duration.

关键词： stratospheric airships deep reinforcement learning station-keeping

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