Study on Pressure Control Strategy for a Environmental Simulation System

Abstract:

A high-altitude multi-parameter environmental simulation system can simulate a high-altitude flying environment for aircraft on ground. It has a very important effect on researching aircraft Environment Control System (ECS) and testing its working performance. However, it is very difficult for a traditional experimental system to realize a pressure decoupling control in a real multi-parameter simulation because the pressure control is strongly coupling with the temperature and humidity control. Therefore, a multi-parameter environmental simulation experiment is not very fast and precise currently. In order to meet the high-altitude experimental requirements, it needs to develop a new experimental method and the corresponding strategy. In this paper, an experimental method is used and it controls the pressure in the environmental simulation cabin only by using an air exhaust valve. Further, a two-degree-of-freedom PID pressure control strategy with a nonlinear compensation is also presented to control the air exhaust valve. The control strategy can realize a pressure decoupling control from the temperature and humidity control. The nonlinear flow character of the air exhaust valve can be compensated by introducing a nonlinear compensation part and the pressure control overshoot can be overcome by the two-degree-of-freedom PID controller. Simulation results show that this presented control strategy can realize a real-time environmental control and improve the control precision and respond speed greatly.

• Periodical: Advanced Materials Research (Volumes 816-817)
• Pages: 389-393
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.816-817.389
• Online since: September 2013
• Authors: Hong Quan Qu, Guo Xiang Li, Jie Yang, Li Ping Pang
• Keywords: Environmental Control System, Multi-Parameter Environmental Simulation, Nonlinear Compensation, Pressure Control, Two-Degree-of-Freedom PID

References

[1] Y. Chen. Evolution of the environmental control systems for commercial aircraft. Acta Aeronautica Et Astronautica Sinica Vol 20 (1999), p.8~10.

[2] K. Linnet, R. Crabtree. What is next in commercial aircraft environmental control system. SAE Paper No. 932057(1993).

[3] J. Zhao, G. Lin, X. Yuan. Experimental study of the dynamic responses of the ECS's bleed system. Journal of Beijing University of Aeronautics and Astronautics Vol 26(5) (2000), p.257~260.

[4] W. Zhao, B. Liu, J. Li, L. Wu. Temperature control of the simulated environment for airplane ground test. Chinese Journal of Scientific Instrument Vol 27(12) (2006), p.1656~1659.

[5] B. Song, J. Zhang. Design on pressure control system of high-altitude simulation cabin. Aviation Precision Manufacturing Technology Vol 41 (5) (2005), p.60~62.

[6] Y. He, J. Yu, W. Jiang, in: Industry process control. Beijing: Chemical Industry Press (2004).

[7] K. Ogata. Modern Control Engineering. Publishing House of Electronics Industry (2000).

[8] J. Zhang, Z. Liu, R. Pei. Two-degree-of-freedom PID control for integrator and dead time process. Control and Decision Vol 17 (6) (2002), p.886~889.

[9] Z. Xiong, W. Wang, Z. Qiu. The Design of Two-degree-of-freedom PID. Techniques of Automation and Applications Vol 22 (4) (2003), p.17~19.