转子旋转激励下弹性环周向限位设计方法研究

During the high-speed rotation of the rotor，radial and circumferential loads are exerted on the elastic ring support structure at its pivot point. To prevent circumferential movement of the elastic ring，a circumferential limiting design must be implemented. For the classical elastic ring structure employing positioning pins for limiting，a high-precision finite element simulation model was established，accurately accounting for the contact state between the elastic ring，bearing seat，and positioning pins. A method for applying dynamic loads at the pivot point under the excitation of high-speed rotor rotation was developed to conduct a simulation analysis of the deformation and stress distribution of the elastic ring under radial and circumferential loads，thereby accurately assessing potential damage modes of the limiting structure and validating the results through experiments. Ultimately，a distributed circumferential limiting design scheme integrating the boss and bearing seat was proposed for the elastic ring structure under load. The results indicate that during the precessional motion of the high-speed rotor，a circumferential dragging load is generated at the pivot point. In the classical elastic ring limited by positioning pins，significant stress concentration occurs at the contact point between the pins and the elastic ring，with maximum stress reaching 823 MPa. This represents a vulnerable point for damage in the elastic ring structure，which aligns with the damage characteristics observed at the contact point of the positioning pins following the experiments. The adoption of a distributed circumferential limiting design that merges the boss with the bearing seat effectively disperses the circumferential load，resulting in a reduction of maximum stress by 69.1%，low-ering it to 254 MPa and effectively addressing the structural damage challenges posed by local stress concentration in the positioning pins.