A kind of assembly rotor connected by rabbet joint structure was introduced. Based on analyzing the stiffness loss model of rabbet joint structure

the effect of joint structure on the overall stiffness of the rotor was obtained. And then through the nonlinear finite element contact analysis

the rigidity robust design method was obtained. Results show that

by means of increasing the local stiffness of rabbet

avoid bending strain energy concentrated in the joint structure

and ensure 20% margin of the critical speed of bending from the working speed

the rigidity robust can be enhanced; by means of designing the rabbet with interference fit

improve the axial compression force and optimize the local structure of the rabbet

the contact state robust can be enhanced.