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Some possible station layouts and characteristics of evacuated tube transportation

Journal of Modern Transportation 2011年第3期19卷 181-185页

作者： Yaoping ZHANG Benlin LIU Yong ZHAO Institute of Vacuum Tube Transportation Xijing University Xi ＇an 710123 China Superconductivity and New Energy Center （SNEC） Southwest Jiaotong University Chengdu 610031 China

Since Maglev vehicles will run in a closed vacuum tube,the layout of the terminal stations of evacuated tube transportation（ETT） will differ from the traditional railway stations.This paper deals with some possible station layouts of ETT,e.g.,a station with an airlock,a station without an airlock,above ground and underground stations,and stations with either level arrayed or rotation platforms.Then different station layouts are compared,and characteristics of each are analyzed.Finally,a more secure mode for ETT station layouts is suggested,which can be the basis for future ETT station layout and designs.

关键词： station layout terminal vacuum evacuated tube transportation airlock

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Pressure Gradient Control Strategies Based on Disturbance Rejection for Typical Pharmaceutical Cleanrooms

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World Journal of Engineering and Technology 2021年第3期9卷 555-564页

作者： Chunwang Li Xiaojun Ma Chun-E Huang College of Biochemical Engineering Beijing Union University Beijing China Institute of Fundamental and Interdisciplinary Sciences Beijing Union University Beijing China

Keeping pressure gradient is an excellent approach to prevent the reveal of airflow direction and cross infection in manufacturing circumstances of pharmaceutical cleanrooms, thus how to keep cleanroom’s pressure is critical. In the paper, we study a positive pressure pharmaceutical cleanroom system which is composed by a cleanroom and an airlock. We divide the system’s disturbances into step disturbance, ramp disturbance and sine wave disturbance. We design its pressure gradient control strategies, including CAV control, PID control and active-disturbance-rejection-control. We build the system’s model and make simulations based on Matlab/Simulink software platform. Results show that active-disturbance-rejection-control algorithm has good capabilities for shorter responding time and lower overshot of the pressure gradient. The results reveal that active-disturbance-rejection-control method has good control performances in responding time, accuracy and disturbance rejection.

关键词： Pressure Gradient Pharmaceutical Cleanrooms airlock Active-Disturbance-Rejection-Control PI Control

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