Performance of Time Domain Indicators for Gear Tooth Root Crack Detection and Their Noise-Sensitivity

2013 ◽  
pp. 303-312
Author(s):  
Omar D. Mohammed ◽  
Matti Rantatalo
Keyword(s):  
Time Domain ◽  
Crack Detection ◽  
Gear Tooth ◽  
Noise Sensitivity ◽  
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 Frequency and Vibration Characteristics of High-Speed Gear-Rotor-Bearing System with Tooth Root Crack considering Compound Dynamic Backlash

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Jie Liu ◽  
Weiqiang Zhao ◽  
Weiwei Liu
Keyword(s):  
Time Domain ◽  
Crack Depth ◽  
Transmission System ◽  
Gear System ◽  
Time Varying ◽  
Tooth Root ◽  
Meshing Stiffness ◽  
The Time Domain ◽  
Center Distance ◽  
Root Crack

Considering the microstructure of tooth surface and the dynamic characteristics of the vibration responses, a compound dynamic backlash model is employed for the gear transmission system. Based on the fractal theory and dynamic center distance, respectively, the dynamic backlash is presented, and the potential energy method is applied to compute the time-varying meshing stiffness, including the healthy gear system and the crack fault gear system. Then, a 16-DOF coupled lateral-torsional gear-rotor-bearing transmission system with the crack fault is established. The fault characteristics in the time-domain waveform and frequency response and statistics data are described. The effect of crack on the time-varying meshing stiffness is analyzed. The vibration response of three backlash models is compared. The dynamic response of the system is explored with the increase in crack depth in detail. The results show that the fault features of countershaft are more obvious. Obvious fluctuations are presented in the time-domain waveform, and sidebands can be found in the frequency domain responses when the tooth root crack appears. The effect of compound dynamic backlash on the system is more obvious than fixed backlash and backlash with changing center distance. The vibration displacement along meshing direction and dynamic meshing force increases with the increase in crack depth. Backlash and variation of center distance show different tendencies with increasing crack depth under different rotational speeds. Amplitude of the sidebands increases with crack depth increasing. The amplitude of multiplication frequency of rotational frequency has an obvious variation with growing crack depth. The sidebands of the multiplication frequency of meshing frequency show more details on the system with complex backlash and crack fault.

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

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.

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