The Crack Detection Problem in Vibrating Beams

2003 ◽  
pp. 163-177 ◽  
Author(s):  
Antonino Morassi
Keyword(s):  
Crack Detection ◽  
Detection Problem ◽  
Vibrating Beams

On the application of modified cuckoo optimization algorithm to the crack detection problem of cantilever Euler–Bernoulli beam

2015 ◽  
Vol 157 ◽  
pp. 42-50 ◽  
Author(s):  
Seyed Alireza Moezi ◽  
Ehsan Zakeri ◽  
Amin Zare ◽  
Mehrshad Nedaei
Keyword(s):  
Optimization Algorithm ◽  
Crack Detection ◽  
Bernoulli Beam ◽  
Detection Problem ◽  
Cuckoo Optimization Algorithm ◽  
Euler Bernoulli Beam

scholarly journals A new level-set technique for the crack-detection problem

PAMM ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 1081501-1081502 ◽  
Author(s):  
Diego Alvarez ◽  
Oliver Dorn ◽  
Miguel Moscoso
Keyword(s):  
Level Set ◽  
Crack Detection ◽  
Detection Problem

The full nonlinear crack detection problem in uniform vibrating rods

2015 ◽  
Vol 339 ◽  
pp. 99-111 ◽  
Author(s):  
Lourdes Rubio ◽  
José Fernández-Sáez ◽  
Antonino Morassi
Keyword(s):  
Crack Detection ◽  
Detection Problem ◽  
Nonlinear Crack

scholarly journals Rayleigh's quotient for multiple cracked beam and application

2011 ◽  
Vol 33 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Nguyen Tien Khiem ◽  
Tran Thanh Hai
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Crack Detection ◽  
Natural Frequencies ◽  
Shape Function ◽  
Detection Problem ◽  
Cracked Beam ◽  
Rayleigh’S Quotient ◽  
Good Agreement

Rayleigh's quotient for Euler-Bernoulli multiple cracked beam with different boundary conditions has been derived from the governed equation of free vibration. An appropriate choosing of approximate shape function in terms of mode shape of uncracked beam and specific functions satisfying conditions at cracks and boundaries leads to an explicit expression of natural frequencies through crack parameters that can simplify not only the analysis of natural frequencies of cracked beam but also the crack detection problem. Numerical analysis of natural frequencies of the cracked beam by using the obtained expression in comparison with the well-known methods such as the characteristic equation and finite element method shows their good agreement. The analytical expression of natural frequencies applied to the crack detection problem allows the result of detection to be improved.

scholarly journals An improved generative adversarial network with modified loss function for crack detection in electromagnetic nondestructive testing

2021 ◽  
Author(s):  
Lulu Tian ◽  
Zidong Wang ◽  
Weibo Liu ◽  
Yuhua Cheng ◽  
Fuad E. Alsaadi ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Loss Function ◽  
Real World ◽  
Crack Detection ◽  
Contrast Ratio ◽  
Detection Problem ◽  
Generative Adversarial Network ◽  
The Real ◽  
Adversarial Network ◽  
Optical Images

AbstractIn this paper, an improved generative adversarial network (GAN) is proposed for the crack detection problem in electromagnetic nondestructive testing (NDT). To enhance the contrast ratio of the generated image, two additional regulation terms are introduced in the loss function of the underlying GAN. By applying an appropriate threshold to the segmentation of the generated image, the real crack areas and the fake crack areas (which are affected by the noises) are accurately distinguished. Experiments are carried out to show the superiority of the improved GAN over the original one on crack detection tasks, where a real-world NDT dataset is exploited that consists of magnetic optical images obtained using the electromagnetic NDT technique.

Three-Dimensional Ultrasonic Crack Detection in Anisotropic Materials

1997 ◽  
Vol 9 (2) ◽  
pp. 59-79 ◽  
Author(s):  
J. Mattsson ◽  
A. J. Niklasson ◽  
A. Eriksson
Keyword(s):  
Crack Detection ◽  
Three Dimensional ◽  
Anisotropic Materials

Status of nondestructive control of transport function metal products at JSC EVRAZ NTMK

2020 ◽  
Vol 76 (6) ◽  
pp. 586-590
Author(s):  
S. P. Bersenev ◽  
E. M. Slobtsova
Keyword(s):  
Crack Detection ◽  
Middle Part ◽  
Control Line ◽  
Magnetic Powder ◽  
Nondestructive Control ◽  
Automated Control ◽  
Ultrasonic Control ◽  
Acoustic Contact ◽  
In Series

Achievements in the area of automated ultrasonic control of quality of rails, solid-rolled wheels and tyres, wheels magnetic powder crack detection, carried out at JSC EVRAZ NTMK. The 100% nondestructive control is accomplished by automated control in series at two ultrasonic facilities RWI-01 and four facilities УМКК-1 of magnetic powder control, installed into the exit control line in the wheel-tyre shop. Diagram of location, converters displacement and control operations in the process of control at the facility RWI-01 presented, as well as the structural diagram of the facility УМКК-1. The automated ultrasonic control of rough tyres is made in the tyres control line of the wheel-tyre shop at the facility УКБ-1Д. The facility enables to control internal defects of tyres in radial, axis and circular directions of radiation. Possibilities of the facility УКБ-1Д software were shown. Nondestructive control of railway rails is made at two facilities, comprising the automated control line of the rail and structural shop. The УКР-64Э facility of automated ultrasonic rails control is intended to reveal defects in the area of head, web and middle part of rail foot by pulse echo-method with a immersion acoustic contact. The diagram of rail P65 at the facility УКР-64Э control presented. To reveal defects of the macrostructure in the area of rail head and web by mirror-shadow method, an ultrasonic noncontact electromagnetic-acoustic facility is used. It was noted, that implementation of the 100% nondestructive control into the technology of rolled stuff production enabled to increase the quality of products supplied to customers and to increase their competiveness.

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