Based on the mechanical model of bending deformation of the beam

a mathematical model for calculating the stiffness of the ventral plate of a single open rectangular groove cavity including a process convex platform is established. On the basis of this

the numerical calculation method is used to analyze the effect of the process convex table on the geometric center position of the groove and the stiffness of the groove center

and the effect of the size of the process convex table on the stiffness reinforcement. The calculation results show that when a process convex platform is set up in the center of the slot of the opening slot

the reinforcement stiffness of the groove edge is approximately linear with the width dimension of the process convex platform

and the reinforcement stiffness of the groove edge is very sensitive to the length size of the convex platform. With the reduction of the length of the convex platform

the stiffness reinforcement effect of the convex platform on the edge of the groove is very significant

and the stiffness enhancement effect of the convex platform on the geometric center of the ventral plate is almost negligible.