Observation of Changes in Acoustic Emission and Vibration Signals to Transverse Crack on Rotating Shaft: An Experiment Investigation

2017 ◽  
Vol 7 (5) ◽  
pp. 1853
Author(s):  
Novitha Leonora Thedora Thenu ◽  
I Made Ariana ◽  
Achmad Zubaydi ◽  
Dhany Arifianto
Keyword(s):  
Acoustic Emission ◽  
Transverse Crack ◽  
Rotating Shaft ◽  
Vibration Signals

Vibration And Stability Of A Rotating Shaft Containing A Transverse Crack

1993 ◽  
Vol 162 (3) ◽  
pp. 387-401 ◽  
Author(s):  
S.C. Huang ◽  
Y.M. Huang ◽  
S.M. Shieh
Keyword(s):  
Transverse Crack ◽  
Rotating Shaft

scholarly journals Transverse Crack Detection in 3D Angle Interlock Glass Fibre Composites Using Acoustic Emission

Materials ◽  
2016 ◽  
Vol 9 (8) ◽  
pp. 699 ◽  
Author(s):  
Matthieu Gresil ◽  
Mohamed Saleh ◽  
Constantinos Soutis
Keyword(s):  
Acoustic Emission ◽  
Glass Fibre ◽  
Crack Detection ◽  
Transverse Crack ◽  
Fibre Composites

Energy Distribution Analysis Regarding the Crack Size in a Rotating Shaft

2019 ◽  
Vol 24 (3) ◽  
pp. 418-425
Author(s):  
Cristina Cristina Castejon ◽  
Marıa Jesus Gomez ◽  
Juan Carlos Garcia-Prada ◽  
Eduardo Corral
Keyword(s):  
Wavelet Transform ◽  
Crack Detection ◽  
Wavelet Packet ◽  
Critical Role ◽  
Wavelet Packet Transform ◽  
Discrete Wavelet ◽  
Distribution Analysis ◽  
Rotating Shaft ◽  
Vibration Signals ◽  
Machine Monitoring

Maintenance is critical to avoid catastrophic failures in rotating machinery, and the detection of cracks plays a critical role because they can originate failures with costly processes of reparation, especially in shafts. Vibration signals are widely used in machine monitoring and fault diagnostics. The most critical issue in machine monitoring is the suitable selection of the vibration parameters that represent the condition of the machine. Discrete Wavelet Transform, and one of its recursive forms, called Wavelet Packet Transform, provide a high potential for pattern extraction. Several factors must be selected and taken into account in the Wavelet Transform application such as the level of decomposition, the suitable mother wavelet, and the level basis or features. In this work, the dynamic response of a shaft with different levels of crack is studied. The evolution of energy of the vibration signals obtained from the rotating shaft and the frequencies where maximum increments of energy appear with the crack are analyzed. The results allow the conclusion that changes in energies computed by means of the Wavelet Packet Transform can be successfully used for crack detection.

scholarly journals Detection of delamination onset in laser-cut carbon fiber transverse crack tension specimens using acoustic emission

2014 ◽  
Vol 49 (21) ◽  
pp. 2639-2647 ◽  
Author(s):  
Torben Prieß ◽  
Markus GR Sause ◽  
Daniel Fischer ◽  
Peter Middendorf
Keyword(s):  
Acoustic Emission ◽  
Carbon Fiber ◽  
Transverse Crack

In-Plane Vibration and Crack Detection of a Rotating Shaft-Disk Containing a Transverse Crack

1998 ◽  
Vol 120 (2) ◽  
pp. 551-556 ◽  
Author(s):  
Ming-Chuan Wu ◽  
Shyh-Chin Huang
Keyword(s):  
Crack Detection ◽  
Transverse Crack ◽  
Rotation Speed ◽  
Crack Depth ◽  
Multiple Scale ◽  
Crack Identification ◽  
Response Curves ◽  
Rotating Shaft ◽  
Crack Location ◽  
Depth Rotation

Dynamic response and stability of a rotating shaft-disk containing a transverse crack is investigated. FFT analysis of response amplitudes showed that the 2Ω component (Ω: rotation speed) was excited by crack breathing and could serve as a good index for crack identification. Intensive numerical studies of crack location, crack depth, rotation speed, and sensing position on response amplitudes displayed a feasible technique for the identification of crack depth and crack location. It is achieved by intersecting the two equi-amplitude response curves of two separated sensing probes. Finally, the instability of the system caused by a crack is examined via Floquet theory and the multiple scale method. The stability diagrams, illustrated as functions of crack depth, rotation speed, and damping, are shown and discussed.

scholarly journals The Influence of Crack Modes on the Elastic Wave Propagation Characteristics in a Non-uniform Rotating Shaft

2018 ◽  
Author(s):  
Yimin Wei ◽  
Xuan Shi ◽  
Qi Liu ◽  
Wenhua Chen
Keyword(s):  
Elastic Wave ◽  
Elastic Waves ◽  
Transverse Crack ◽  
Propagation Characteristics ◽  
Mode Iii ◽  
Transverse Cracks ◽  
Rotating Shaft ◽  
Rotating Speed ◽  
Local Flexibility ◽  
The Media

The vibration propagates in a media such as a shaft in the form of elastic waves. The propagation characteristics of the waves are affected by the geometry of the media, the material properties as well as the cracks. The study to elastic waves propagating in a shaft with transverse cracks can help to detect them. The transverse crack possesses different crack modes due to different external loads. The influence of the crack mode, the location and the depth to the propagation characteristics is investigated in this paper. Firstly, the local flexibility coefficients with three different modes are deduced. And then, the transfer matrix of the elastic wave can be obtained. Finally, the influence of the crack mode, the location and the depth of the transverse crack as well as the rotating speed to the propagation characteristics is then studied, both in a numerical and an experimental way. It’s found that mode III is the most suitable mode in this paper, the location of the crack will make the stopbands fluctuating, the depth mainly affects the bandwidth of the stopbands, and the increase of the rotating speed will shift up the stopbands without changing their bandwidths.

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