Stiffness Modeling of Tooth Interior Fatigue and Tooth Flank Fracture and Their Fault Characteristics in Electromechanical Coupling Systems

Tooth flank fracture (TFF) and tooth interior fatigue fracture (TIFF) usually occur on case-harden gears in electromechanical coupling systems, both starting from the core caused by metal fatigue. The cracks propagate rapidly compared with the total life of a gear, so that it is necessary to detect...

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Bibliographic Details
Published in:Shock and vibration 2024-02, Vol.2024, p.1-21
Main Authors: Han, Lin, Wang, Dianrui, Jan, Muhammad Anwar, Yang, Fuchun
Format: Article
Language:English
Subjects:
Comparative analysis
Coupling
Crack initiation
Crack propagation
Deformation
Energy
Energy methods
Failure
Fatigue
Fatigue cracks
Fatigue failure
Fatigue testing machines
Fault detection
Faults
Finite element analysis
Finite element method
Force and energy
Frequencies
Frequency domain analysis
Growth models
Load
Materials
Metal fatigue
Phase diagrams
Potential energy
Propagation
Stiffness
Tooth root
Tooth root cracking
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Summary:Tooth flank fracture (TFF) and tooth interior fatigue fracture (TIFF) usually occur on case-harden gears in electromechanical coupling systems, both starting from the core caused by metal fatigue. The cracks propagate rapidly compared with the total life of a gear, so that it is necessary to detect and identify the faults in time when they take place in order to avoid danger. In this paper, the time-varying mesh stiffness model of two types of faults is established by the potential energy method and validating by the finite element method. Based on the stiffness model, the influence of faults on the electromechanical system and their fault characteristics are analyzed, which provides a theoretical basis for the health detection of electromechanical coupling systems. The results indicate that in the early stage of the three faults, i.e., tooth root fracture, tooth interior fatigue fracture, and tooth flank fracture, it is hard to discriminate the faults. But after the second stage, the faults can be distinguished by the vibration amplitude, frequency band components, and phase diagrams. The TFF can be discerned into different stages by frequency domains and phase diagrams. When the fracture occurs completely, three faults can be easily distinguished by the time domain and phase diagram. In the frequency domain, the TRF can also be distinguished from the other two faults by referring to the sideband component near the meshing frequency.
ISSN:1070-9622
1875-9203
DOI:10.1155/2024/9931058