In order to analyze the rotor dynamics of a rod fastening rotor and compare its differences with the integral rotor

a model based on lumped parameter method was proposed. By modification of the stiffness of the beam element

the effects of contacts between the disks

pre-stresses in the disks produced by the axial preload and the rods can be considered. Firstly

the effects of the three factors on the stiffness of the beam in static were analyzed

and the modified coefficients were obtained. The results show that

contacts and rods compared with the pre-stresses in the discs had relatively large effects on the dynamics of the rod fastening rotor. Then the modification coefficients for each beam element of an experimental rod fastening rotor were calculated and the dynamic model of the rotor was established. The critical speeds were calculated and agreed well with the experimental results. The error was just 0.8%

validating the method proposed. The results are very useful in dynamics analysis and design of other combined structures.