Effects of tooth root cracks on vibration and dynamic transmission error responses of asymmetric gears: A comparative study


Kalay O. C., Dogan O., Yüce C., Karpat F.

MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES, vol.52, no.5, pp.2569-2604, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 52 Issue: 5
  • Publication Date: 2024
  • Doi Number: 10.1080/15397734.2023.2186892
  • Journal Name: MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Compendex, INSPEC, DIALNET
  • Page Numbers: pp.2569-2604
  • Keywords: Asymmetric gear, AISI 9310, dynamic analysis, tooth root crack, fault detection, MESH STIFFNESS, SPUR GEARS, DIAGNOSIS, STRENGTH, DESIGN, DRIVES, MODEL
  • Bursa Uludag University Affiliated: Yes

Abstract

Gears are significant machine elements used in various industrial applications. An undetected fault in a gear transmission system may lead to a fatal breakdown and, thus, severe economic losses or even human casualties. From this standpoint, the present study developed a numerical method to detect root crack damages in symmetric and asymmetric involute spur gears. To achieve this end, the single tooth stiffness values were calculated for healthy and cracked (25%-50%-75%-100%) gears, and then the time-varying mesh stiffness was obtained. A six-degree-of-freedom dynamic model of a single-stage gear mechanism was developed to collect vibration and Dynamic Transmission Error (DTE) signals. The efficacy of vibration and DTE responses in fault detection was compared through six statistical indicators. The results indicate that the vibration signals were more effective than DTE in detecting tooth root cracks. It was observed that the statistical indicator changes significantly increase with the increment of the drive side pressure angle from 20 degrees to 30 degrees for the backup ratios where the root crack propagates along the tooth, thus making fault detection easier. The findings could provide significant outputs for a better understanding of the influence of tooth asymmetry on gear dynamics characteristics and early fault diagnosis.