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Finite Thrust Transfer Strategy Designing for Low Energy Moon Return Based on GPM/VSM

International Journal of Automation and computing 2015年第5期12卷 490-496页

作者： Liu Yue Wu-Xing Jing Ying-Ying Xiao Department of Astronautics Engineering Harbin Institute of Technology

In a low energy moon return mission, due to the weak stability of the orbit, it is necessary to implement an accurate orbital maneuver to guarantee a successful return. During the process of getting the optimal thrust control with these two kinds of methods, it is hard to guess the initial value of the co-states in the indirect method while a large amount of calculation is needed to insure the precision in the direct method. To solve the problem, in this paper a combined method is given which has the merit of both direct and indirect methods. In this method, the virtual satellite method(VSM) and the Gauss pseudo-spectral method(GPM)are applied, while the fuel optimal control strategy is computed with GPM to carry out a soft rendezvous between the spacecraft and a hypothetical virtual satellite running on the nominal low energy return orbit so that the spacecraft will enter the return orbit accurately. Compared with the direct and indirect methods, this combined method can avoid guessing the initial value of the co-states and the complexity of calculation is acceptable. According to the simulation results, the spacecraft is inserted to the target return orbit with a high accuracy and also the optimization is very effective.

关键词： Moon trajectories optimization and simulation virt

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Numerical Study on the Suitability of Passive Solar Heating Technology Based on Differentiated Thermal Comfort Demand

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Computer Modeling in Engineering & Sciences 2022年第8期132卷 627-660页

作者： Xiaona Fan Qin Zhao Guochen Sang Yiyun Zhu School of Civil Engineering and Architecture Xi’an University of TechnologyXi’an710048China

Indoor thermal comfort and passive solar heating technologies have been extensively ***,few studies have explored the suitability of passive solar heating technologies based on differentiated thermal comfort *** work took the rural dwellings in Northwest China as the research ***,the current indoor and outdoor thermal environment in winter and the mechanism of residents’differentiated demand for indoor thermal comfort were obtained through tests,questionnaires,and statistical ***,a comprehensive passive optimized design of existing buildings was conducted,and the validity of the optimized combination scheme was explored using DesignBuilder ***,the suitability of passive solar heating technology for each region in Northwest China was analyzed based on residents’differentiated demand for indoor thermal *** regions were then classified according to the suitability of the technology for *** results showed that the indoor heating energy consumption was high and the indoor thermal environment was not ideal,yet the solar energy resources were *** comfort temperature indexes that match the functional rooms and usage periods were *** the buildings with the optimized combination scheme,the average indoor temperature was increased significantly and the temperature fluctuation was decreased *** regions in Northwest China were suitable for the development of passive solar heating *** on the obtained suitability of the technology for the regions of Northwest China,these were classified into most suitable,more suitable,less suitable,and unsuitable regions.

关键词： Rural dwellings differentiated thermal comfort demand optimization and simulation statistical analysis passive solar heating technology suitability

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Research on Parameters optimization of Transmission System of Military Off-road Vehicle

Research on Parameters Optimization of Transmission System o...

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2016中国汽车工程学会年会暨展览会

作者： Li Bo Li Xueyuan Wu Wei Zhou Junjie Qin Chaoheng Science and Technology on Vehicular Transmission Laboratory Beijing Institute of Technology

ISBN: (纸本)9789811035272;9789811035265

The working conditions of Military off- road vehicles is harsh and complex,which put forward higher requirements on vehicle dynamic *** of the transmission system obtained by the traditional geometric series division method is usually difficult to achieve good dynamic property and fuel *** proposed a comprehensive objective function of dynamic property and fuel economy based on weight coefficient *** the basis of the traditional geometric series division method,considering the dynamic constraint conditions of off- road vehicles,a set of optimal transmission parameters are confirmed using the nonlinear optimization function fmincon in Matlab optimization *** results show that the acceleration time and fuel consumption reduced after optimization,and the military off- road vehicles achieved a better dynamic property and fuel economy.

关键词： powertrain system dynamic property fuel economy optimization and simulation vehicle dynamics

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