Spindle vibration reliability analysis considering bearing nonlinear restoring force

In order to study the effect of spindle vibration on the reliability of machine tools during service life，this paper takes a certain type of spindle as the research object，uses the sum of nonlinear bearing restoring force and rotational unbalance force as the external excitation of the spindle-bearing system，establishes a 14-degree-of-freedom dynamic model of the machine tool spindle-bearing system using the lumped mass method， and solves the dynamic equation using numerical methods. An experimental platform is built to compare the results of the experiment with the results of the dynamic model to illustrate the effectiveness of the system dynamics modeling. Then， considering the randomness of bearing parameters，a spindle vibration reliability model is established with the maximum vibration displacement of the spindle shaft end as the evaluation index. Finally，the adaptive Kriging combined with Monte Carlo simulation method（AK-MCS）is used for reliability analysis of machine tool spindle vibration. The results show that the dynamic model and reliability evaluation method proposed in this paper have high accuracy. © 2025 Editorial Board of Jilin University. All rights reserved.