A method for modeling the dynamics of local defects in rolling bearings taking into account the contact behavior at the edge of the defect and the representation of the interface slip

By using progressive edge contact displacement excitation and the LuGre friction model, combined with a multi-degree-of-freedom dynamic system, the problem of contact and friction discontinuity in rolling bearing dynamic modeling is solved, enabling more accurate vibration response and force analysis, and supporting high-reliability fault diagnosis.

CN122452103APending Publication Date: 2026-07-24CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV
Filing Date
2026-04-02
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing rolling bearing dynamics modeling methods are difficult to accurately reflect the progressive contact process between the rolling element and the defect edge, and the friction model has discontinuities in the static-dynamic friction transition, which affects the accuracy of fault mechanism analysis and simulation.

Method used

A progressive edge contact local fault displacement excitation function and LuGre friction model are adopted, combined with a multi-degree-of-freedom dynamic system, to describe the contact and friction behavior between the rolling element and the inner and outer raceways. Detailed dynamic equations are established and solved by the Runge-Kutta algorithm to obtain the vibration response signal.

Benefits of technology

It improves the physical realism of contact forces in defective areas of rolling bearings, realizes the continuous transition of static and dynamic friction, enhances the accuracy of vibration response and force analysis, and provides highly reliable simulation data for fault diagnosis.

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Abstract

The application discloses a kind of local defect dynamics modeling method of rolling bearing considering defect edge contact behavior and interface slip representation, first, the dynamics model of rolling bearing is established, and the multi-degree-of-freedom dynamics system of the motion state of rolling body is described;Based on the physical diameter effect of rolling body itself, progressive edge contact local fault displacement excitation function is established;Second, the inner raceway compression, outer raceway compression and contact force in the contact between rolling body and inner raceway, outer raceway are calculated, and the relative velocity and friction force of rolling body and inner raceway, outer raceway;Then, the constraint of cage to rolling body is modeled as spring-damping system, and the constraint force of cage to rolling body is calculated;Then, the dynamics equation of inner raceway, outer raceway, the jth rolling body and additional support in X axis and Y axis of rolling bearing with defect is established;Finally, the established dynamics equation is solved, and the vibration response signal for condition monitoring and fault diagnosis is obtained.
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