Results 251 to 260 of about 1,805,455 (304)
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Damage detection using generic elements: Part II. Damage detection
Computers & Structures, 2003This paper proposes the use of generic elements in damage detection, based on the use of an updated baseline finite element model, modal sensitivities and changes in the measured modal quantities arising from structural damage. A companion paper presented the fundamental theory of model updating and generic element or substructure parameterisation. The
Titurus, Branislav +2 more
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Science, 2008
A break in both strands of the DNA double helix is potentially very dangerous for organisms because the free ends can recombine inappropriately with other parts of the genome and cause substantial damage. Eukaryotic cells sense and attempt to repair such breaks very rapidly, through the recruitment of DNA repair proteins to the sites of damage, forming
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A break in both strands of the DNA double helix is potentially very dangerous for organisms because the free ends can recombine inappropriately with other parts of the genome and cause substantial damage. Eukaryotic cells sense and attempt to repair such breaks very rapidly, through the recruitment of DNA repair proteins to the sites of damage, forming
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Science Signaling, 2003
Protein complexes called tight junctions hold adjacent cells of an epithelial monolayer tightly together, creating a physical barrier between apical and basolateral membranes. Vermeer et al. show that in human airway epithelia, tight junctions keep the growth factor heregulin, and its receptor, erbB2, apically and ...
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Protein complexes called tight junctions hold adjacent cells of an epithelial monolayer tightly together, creating a physical barrier between apical and basolateral membranes. Vermeer et al. show that in human airway epithelia, tight junctions keep the growth factor heregulin, and its receptor, erbB2, apically and ...
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Damage Detection Through Pipe Bends
Journal of Pressure Vessel Technology, 2017Axial pipeline defects are detectable from torsional guided wave reflections through 90 deg elbows. This paper demonstrates that detection of localized damage in carbon steel pipes with a so-called standard long and very long radius elbow is possible using a single permanently installed source–receiver pair.
Vogelaar, B.B.S.A., Golombok, M.
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2016
Creep is an important factor in designing metal structures used at elevated temperatures. Dislocations again play a key role in deformation at elevated temperatures; they multiply, slip, form voids and subgrain boundaries, and annihilate. This chapter shows that the shear wave attenuation is highly sensitive to the dislocation activity in crept metals ...
Masahiko Hirao, Hirotsugu Ogi
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Creep is an important factor in designing metal structures used at elevated temperatures. Dislocations again play a key role in deformation at elevated temperatures; they multiply, slip, form voids and subgrain boundaries, and annihilate. This chapter shows that the shear wave attenuation is highly sensitive to the dislocation activity in crept metals ...
Masahiko Hirao, Hirotsugu Ogi
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Wavelet-Based Structural Damage Detection
Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C, 2007In this paper, a new wavelet-based approach for crack identification in beam-like structures is presented and applied to simply-supported beams with single or multiple cracks. A novel damage index, based on finding the difference between two sets of detail coefficients obtained by the use of the Stationary Wavelet Transform (SWT) of two reconstructed ...
Zhong, S, Oyadiji, S Olutunde
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Damage Detection in Flexible Structures
Journal of Sound and Vibration, 1993Abstract A method is developed for the detection of the existence and location of structural damage. Structural damage is considered to be at the macroscopic level. The detection is carried out in two parts. In the first part, the eigensolution of the structure is identified using a modal parameter identification technique and the system response ...
Baruh, H., Ratan, S.
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1971
Relationships between the characterization and the nondestructive detection of fatigue damage are discussed and illustrated. Inspection methods presently used at overhaul facilities are reviewed, and examples of the equipment used and the results obtained are given. The advantages and limitations of currently used nondestructive methods are summarized.
JR Barton, FN Kusenberger
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Relationships between the characterization and the nondestructive detection of fatigue damage are discussed and illustrated. Inspection methods presently used at overhaul facilities are reviewed, and examples of the equipment used and the results obtained are given. The advantages and limitations of currently used nondestructive methods are summarized.
JR Barton, FN Kusenberger
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Damage detection with auxiliary subsystems [PDF]
, 2008 The small sensitivity to local variations of mechanical characteristics turns out to be the major limit of indirect identification techniques based on frequency response measurements. To overcome this limit, the use of sensitivity enhancement techniques has recently proposed: the monitored structure is coupled to an auxiliary system, the constitutive ...
VESTRONI, Fabrizio, VIDOLI, Stefano
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Structural Damage Detection Using Local Damage Factor
Journal of Vibration and Control, 2006Damage in a structure alters its dynamic characteristics. Significant research has been conducted in damage detection and structural health monitoring using dynamics-based techniques. But simultaneously determining the presence, severity, and location of damage using the existing damage detection methods can still prove challenging.
Shanshan Wang, Qingwen Ren, Pizhong Qiao
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