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Related Experiment Video

Updated: Jul 16, 2026

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator

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Study on the Dynamic Characteristics of Rub-Impact and Bearing Defect Coupled Faults in a Single-Disk Double-Bearing

Junming Liu¹, Hongyuan Zhang¹, Hongyun Sun¹

¹School of Automotive and Transportation, Shenyang Ligong University, Shenyang 110159, China.

Materials (Basel, Switzerland)

|July 15, 2026

Summary

Rub-impact in electric vehicle (EV) motors significantly alters rotor dynamics, masking localized bearing defects. Global rub-impact behavior dominates system response, complicating fault diagnosis in these high-speed systems.

Keywords:

bearing ring defect width eccentricity rotor dynamics rub-impact fault rub-impact stiffness

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Last Updated: Jul 16, 2026

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Area of Science:

Mechanical Engineering
Rotordynamics
Fault Diagnosis

Background:

Rub-impact is a critical failure mode in high-speed rotor systems, posing risks in aero-engines and increasingly in electric vehicle (EV) traction motors.
Modern EV motors, with high speeds, slender shafts, and narrow air gaps, are susceptible to rub-impact and compound faults.

Purpose of the Study:

To establish a dynamic model for an EV motor rotor system experiencing compound rub-impact and bearing faults.
To investigate the influence of key fault parameters on system dynamics under compound fault conditions.
To provide a theoretical basis for diagnosing and identifying compound faults in rotor systems.

Main Methods:

Developed a dynamic model using Jeffcott rotor theory and the lumped-mass method for compound rub-impact and bearing faults.
Conducted comprehensive analyses of time histories, phase trajectories, Poincaré sections, frequency spectra, and envelope spectra.
Investigated the impact of varying rub-impact stiffness and bearing defect width on system dynamics.

Main Results:

Increased rub-impact stiffness enhanced non-linear behavior and reduced rotor unbalance vibration by 20%.
Under compound faults, rub-impact behavior governed disk response, while bearing-end response was sensitive to bearing defects.
Localized bearing defects had minimal influence on the disk's global dynamic response due to signal attenuation.

Conclusions:

Rub-impact behavior is the dominant factor in the global dynamics of EV motor rotor systems under compound faults.
The study provides quantitative insights into the complex interactions between rub-impact and bearing faults.
Findings offer a theoretical foundation for improved fault diagnosis and identification in EV traction motors.