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Numerical simulation of a cabin ventilation subsystem in a space station oriented real-time system

Chinese Journal of Aeronautics 2017年第6期30卷 1809-1817页

作者： Zezheng QIU Liping PANG Guoxiang LI Helin ZHANG School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Aviation Key Laboratory of Science and Technology on Aero Electromechanical system Integration Nanjing Engineering Institute of Aircraft SystemsNanjing 211102China

An environment control and life support system（ECLSS） is an important system in a space station. The ECLSS is a typical complex system, and the real-time simulation technology can help to accelerate its research process by using distributed hardware in a loop simulation system. An implicit fixed time step numerical integration method is recommended for a real-time simulation system with time-varying parameters. However, its computational efficiency is too low to satisfy the real-time data interaction, especially for the complex ECLSS system running on a PC cluster. The instability problem of an explicit method strongly limits its application in the ECLSS real-time simulation although it has a high computational efficiency. This paper proposes an improved numerical simulation method to overcome the instability problem based on the explicit Euler method. A temperature and humidity control subsystem（THCS） is firstly established, and its numerical stability is analyzed by using the eigenvalue estimation theory. Furthermore, an adaptive operator is proposed to avoid the potential instability problem. The stability and accuracy of the proposed method are investigated carefully. Simulation results show that this proposed method can provide a good way for some complex time-variant systems to run their real-time simulation on a PC cluster.

关键词： Numerical integration method Real-time simulation Stability THCS time-variant system

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Explicit Expression of the State-transition Matrix

Explicit Expression of the State-transition Matrix

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第二十四届中国控制会议

作者： Lin Hong, Yang Fuwen (College of Electrical Engineering and Automation,Fuzhou University Fuzhou,Fujian, 350002. China)

＜正＞ Generally, the state-transition matrix （STM） for time-variant case can not be written in a closed form or an explicit expression. An explicit or a compact expression of STM is considered for time-variant case in this paper. A bounded linear operator which maps the infinite terms in STM. under some conditions, to a convergent series whose limit yields the required expression of STM is constructed.

关键词： State-transition matrix Bounded linear operator time-variant system

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