Composite material grating reinforced rear pressure frame comprehensive optimization design method based on shape modification

The invention discloses a composite material grating reinforced rear pressure frame comprehensive optimization design method based on shape modification. The method comprises the following steps: 1) determining a connection scheme of a ball skin and a fuselage; 2) analyzing the arch height of the spherical frame to determine an arch height value range; 3) calculating the minimum thickness of the ball skin; 4) determining curved surface modification schemes, and performing curved surface quality analysis and mechanical property evaluation on different spherical surface frame modification schemes; (5) designing a grating reinforcement scheme; 6) performing optimization analysis on the laying layer, and determining a laying layer angle difference and a laying layer sequence; (7) introducing a system opening, and adjusting grid reinforcement; (8) introducing impact layering damage, and carrying out simulated damage simulation analysis; (9) introducing two-span cracks, and carrying out residual strength analysis;