According to the contact characteristics of the non-continuous structure in gas turbine rotor and the asperity theory

the contact stiffness and contact thermal resistance equivalent model were introduced. Dynamic model for a non-continuous rotor of gas turbine was established. The influence of contact parameters on steady and transient state dynamic characteristic of rotor was analyzed.The thermal deformation of rotor caused by bolt looseness was studied

and the vibration characteristics of rotor based on fast start-up process were analyzed. Result shows that

the pre-tightening force

surface roughness of contact surface and bolt number have a certain influence on critical speeds of rotor

the maximum transient thermal deformation of rotor caused by bolt looseness in start-up process is up to 7μm

and the maximum response amplitude caused by rotor across the first critical speed is increased about 30μm. The influence of contact parameters

contact stiffness and contact thermal resistance of non-continuous rotor on thermally induced vibration characteristics analyze should not be ignored.