Characteristics of pneumatic amplifier used in aircraft cabin pressurization system

CYT-xx is a new type of pneumatic pressurization system which is of high value for use in military aircrafts. But when used in a wide range of aircrafts with different volume of cabin, some unsatisfactory performances arise. To extend rang of its application, a key element, amplifier, is well explored in present paper. It analyses working principal of amplifier in detail. And simulating models are built for both airflow and operation of valves. By contrast simulating result of four different models build for valves, an on-off model is chosen at last. By this way, time consumption in simulation is reduced by about 37%. Simulating result indicates that lag arise when volume excess the originally designed measure. It also indicates that pneumatic amplifier has a higher tracing speed in rising phase than in falling phase of pressure. Structural parameter that possibly affects dynamic performance of pneumatic amplifier is analyzed and two feasible ways are proposed to conserve the originally designed performance in practice. And its feasibility is verified by simulation result.