For the contact status variation of mechanical interface making mechanical properties vary in rotors with non-straight structures

the non-robust problem of rotor systems dynamics characteristic was analyzed

and a novel robust design method of contact status was presented. Result showed that this method analyzed the damage and failure process of mechanical interface in non-straight structural rotor system structural properties optimal design

and established an optimal design for structural properties. This method decreased the sensitivity of mechanical properties under loads and environment. An optimal design of the spline coupling structure in turbine rotor was implemented. The results indicated that the contact stress of optimal solution kept far from stress-constrained boundary under the condition of manufacturing errors. The mechanical properties of non-straight structural rotor system with mechanical interface were more robust than before. The robust design method of mechanical interface shows preferable engineering value.