An analytical method of dynamic stiffness of combined supporting structure and its effects on rotor systems: Simulation and experiment.

The supporting structure's dynamic stiffness has an important influence on the rotor system. However, current research is mainly limited to the stiffness of a single supporting structure. A single supporting structure may not meet the requirements of the rotor system in some cases. Therefore, the method of solving dynamic stiffness of combined supporting structure is presented and compared with the traditional method based on the parallel stiffness formula. The correctness of the proposed method is verified experimentally. Then, the model of rotor system is established that takes into account the combined supporting structure's dynamic stiffness. Finally, the variation of rotor system's critical speeds and vibration response under the influence of dynamic stiffness is analyzed. An experiment is carried out to verify the influence of dynamic stiffness on the critical speeds. Furthermore, the critical speeds of rotor system will decrease under the influence of dynamic stiffness. • This paper presents a dynamic stiffness model of the combined supporting structure. • The accuracy of the proposed model is validated by experiment. • The rotor system model considering dynamic stiffness is established. • The effect of dynamic stiffness on the rotor system is verified by numerical and experimental studies. [ABSTRACT FROM AUTHOR]