ESTIMATING SIZE OF GEAR TOOTH ROOT CRACK USING EMBEDDED MODELLING

2002 ◽  
Vol 16 (5) ◽  
pp. 841-852 ◽  
Author(s):  
C. JAMES LI ◽  
HYUNGDAE LEE ◽  
SUK HWAN CHOI
Keyword(s):  
Gear Tooth ◽  
Tooth Root ◽  
Root Crack

Improved analytical methods for calculation of gear tooth fillet-foundation stiffness with tooth root crack

2017 ◽  
Vol 82 ◽  
pp. 72-81 ◽  
Author(s):  
Zaigang Chen ◽  
Jie Zhang ◽  
Wanming Zhai ◽  
Yawen Wang ◽  
Jianxin Liu
Keyword(s):  
Analytical Methods ◽  
Gear Tooth ◽  
Tooth Root ◽  
Root Crack

Spur gear tooth root crack detection using time synchronous averaging under fluctuating speed

Measurement ◽  
2014 ◽  
Vol 52 ◽  
pp. 1-11 ◽  
Author(s):  
Nizar Ahamed ◽  
Yogesh Pandya ◽  
Anand Parey
Keyword(s):  
Crack Detection ◽  
Gear Tooth ◽  
Spur Gear ◽  
Tooth Root ◽  
Root Crack

scholarly journals Finite element analysis of single pair gear tooth root crack

2019 ◽  
Vol 2019 (23) ◽  
pp. 9166-9169 ◽  
Author(s):  
Shaojun Dong ◽  
Zhongquan Luan ◽  
Chao Ma
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Gear Tooth ◽  
Single Pair ◽  
Tooth Root ◽  
Element Analysis ◽  
Root Crack

Dynamic Simulation of Planetary Gearbox With Tooth Root Crack Based on a Rigid-Flexible Coupled Model

2019 ◽  
Author(s):  
Jianchuan Dai ◽  
Hang Niu ◽  
Chenggang Hou ◽  
Xiaodong Zhang
Keyword(s):  
Crack Propagation ◽  
Dynamic Models ◽  
Gear Tooth ◽  
Coupled Model ◽  
Vibration Signal ◽  
Propagation Path ◽  
Tooth Root ◽  
Crack Propagation Path ◽  
Planetary Gearbox ◽  
Root Crack

Abstract Tooth root crack is one of the most common failures in the gearbox which can lead to the failure of the whole transmission system. However, it is difficult to simulate the gear fault impact in practical work. To solve this problem and to study the relationship between tooth crack propagation and vibration features, various dynamic models have been built. However, the crack propagation path and the bearings are simplified in most of the models, which leads to obvious deviation in the dynamic response. In this paper, a rigid-flexible coupled model of a single-stage planetary gearbox in normal and fault conditions are built by ADAMS software. The crack propagation path is considered a parabolic curve and the thickness of the crack decreases along the path. As a reference, a rigid-body model has also been built to prove that the rigid-flexible coupled model can be more accurate and suitable for analyzing the response of the planetary gearbox with fault. Afterward, the effects of gear tooth root crack size on the gear dynamics are simulated and the corresponding changes in statistical indicators are investigated. By studying the torsional vibration signal of the planetary gearbox with varying severity of the damage, the fault characteristics and damage evolution mechanics can be analyzed and by comparing the fault sensitivity of these indicators, the critical and sensitive fault indicators are screened out.

Vibration characteristics of railway locomotive induced by gear tooth root crack fault under transient conditions

2020 ◽  
Vol 108 ◽  
pp. 104285 ◽  
Author(s):  
Jianzheng Jiang ◽  
Zaigang Chen ◽  
Wanming Zhai ◽  
Tao Zhang ◽  
Yifan Li
Keyword(s):  
Gear Tooth ◽  
Vibration Characteristics ◽  
Tooth Root ◽  
Transient Conditions ◽  
Root Crack

scholarly journals Mathematical Modeling and Dynamic Analysis of Planetary Gears System with Time-Varying Parameters

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Zhengming Xiao ◽  
Jinxin Cao ◽  
Yinxin Yu
Keyword(s):  
Gear Tooth ◽  
Planetary Gear ◽  
Time Varying ◽  
Tooth Root ◽  
Planetary Gears ◽  
Varying Parameters ◽  
Gear Dynamics ◽  
Gear Mesh ◽  
Time Varying Parameters ◽  
Root Crack

Planetary gears are widely used in automobiles, helicopters, heavy machinery, etc., due to the high speed reductions in compact spaces; however, the gear fault and early damage induced by the vibration of planetary gears remains a key concern. The time-varying parameters have a vital influence on dynamic performance and reliability of the gearbox. An analytical model is proposed to investigate the effect of gear tooth crack on the gear mesh stiffness, and then the dynamical model of the planetary gears with time-varying parameters is established. The natural characteristics of the transmission system are calculated, and the dynamic responses of transmission components, as well as dynamic meshing force of each pair of gear are investigated based on varying internal excitations induced by time-varying parameters and tooth root crack. The effects of gear tooth root crack size on the planetary gear dynamics are simulated, and the mapping rules between damage degree and gear dynamics are revealed. In order to verify the theoretical model and simulation results, the planetary gear test rig was built by assembling faulty and healthy gear separately. The failure mechanism and dynamic characteristics of the planetary gears with tooth root crack are clarified by comparing the analytical results and experimental data.

Analytical procedure for the optimization of plastic gear tooth root

2021 ◽  
Vol 166 ◽  
pp. 104496
Author(s):  
Luca Landi ◽  
Alessandro Stecconi ◽  
Giulia Morettini ◽  
Filippo Cianetti
Keyword(s):  
Analytical Procedure ◽  
Gear Tooth ◽  
Tooth Root
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