Design of high overpressure cockpit based on composite material

In the face of the phenomenon of low overpressure of military airplane cockpits in our country, the design thought of high overpressure cockpits was proposed to realize high work efficiency and comfortable cockpit environment. To solve the contradiction between cockpit weight and environmental efficiency, a solution of using composite material to replace aluminium alloy was put forward and then the cockpit optimization was performed by means of the First-Order Radio optimization algorithm. The overpressure value increased by 37.5% from 44 kPa to 55 kPa, and the cockpit weight decreased by 26.1%. Based on the constitutive relation describing material properties, finite element models analyzing the effect of material property parameters on structures were established, also, sensitivity analysis algorithm of Morris was introduced to model parameters analysis. The results show that the major parameters that affect structures are elasticity modulus and Poisson ratio of skin and circumferential reinforcing ribs. And then some suggestions about material design were proposed based on analysis results and the conclusion can provide reference for the design of high overpressure cockpit.