关键词: 座舱, 气动, 压力调节系统, 负压活门, 特性

Abstract:

This paper introduced the functional components of cabin pressure regulating system CTY-xx. The structure and  working principles of NPRV were explained. The theory of plate was used to analyze the behavior of the diaphragm in NPRV, and it is conclused that the opening of the valve is proportional to the pressure difference. The calculation method of effective flow area was given and the needed conditions of acquiring maximum nominal flow area was deduced. In analyzing dynamic characterization of the valve, the requirements of system stability can not be met if only the external behavior is concerned.This paper took the material property of polymer into consideration in establishing dynamic equation of the diaphragm. On the basis of that, the requirements of system stability were analyzed and the ways to shorten response time were pointed out. The testing results show that the bigger the valve's radium, the quicker the relief process.

Key words: cabin, pneumatic, pressure regulating system, negative pressure relief valve(NPRV), characterization