Simultaneous in-plane and out-of-plane displacement measurement based on a dual-camera imaging system and its application to inspection of large-scale space structures

2015 ◽  
Author(s):  
Shien Ri ◽  
Hiroshi Tsuda ◽  
Takeshi Yoshida ◽  
Takashi Umebayashi ◽  
Akiyoshi Sato ◽  
...  
Keyword(s):  
Large Scale ◽  
Imaging System ◽  
Scale Space ◽  
Displacement Measurement ◽  
Space Structures ◽  
Camera Imaging ◽  
Out Of Plane ◽  
Plane Displacement

A simple projection moiré system to measure displacements of aircraft structures

2007 ◽  
Vol 42 (6) ◽  
pp. 477-495 ◽  
Author(s):  
U Galietti ◽  
K Genovese ◽  
L Lamberti ◽  
D Posa
Keyword(s):  
Analytical Model ◽  
Large Scale ◽  
Industrial Applications ◽  
Processing Method ◽  
Simple Analytical Model ◽  
Aerodynamic Loads ◽  
Out Of Plane ◽  
Plane Displacement ◽  
Good Agreement ◽  
Projection Moire

This work presents a simple projection moiré system (PMS) to measure displacements of large-scale aeronautical components. The system includes standard optics, uses a standard fringe-processing method, and relies on a simple analytical model to recover topographic information. An extensive calibration campaign, based on design of experiments, is conducted in order to find the best analytical model for retrieving the out-of-plane displacement field from the moiré pattern and to find the optimal combination of parameters involved in the measurement system. In order to check the suitability of the present PMS device for practical industrial applications, distortions induced by aerodynamic loads on a landing-light glazing of an Airbus A340 are measured. Experimental results are in good agreement with other measurements carried out independently.

The Robust Optimization for Large-Scale Space Structures Subjected to Thermal Loadings

2010 ◽  
Vol 33 (3) ◽  
pp. 202-225 ◽  
Author(s):  
Lijia Fan ◽  
Zhihai Xiang ◽  
Mingde Xue ◽  
Zhangzhi Cen
Keyword(s):  
Robust Optimization ◽  
Large Scale ◽  
Scale Space ◽  
Space Structures

Failure of a Thermal Barrier System Due to a Cyclic Displacement Instability in the Thermally grown Oxide

2000 ◽  
Vol 645 ◽  
Author(s):  
Daniel R. Mumm ◽  
Anthony G. Evans
Keyword(s):  
Bond Coat ◽  
Large Scale ◽  
Thermal Exposure ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
Oxide Interface ◽  
Barrier Coating ◽  
Out Of Plane ◽  
Plane Displacement ◽  
Thermally Grown

ABSTRACTThe mechanism controlling the cyclic failure of a commercial thermal barrier system has been investigated. The system comprises an electron-beam physical vapor deposited (EB-PVD) yttria-stabilized zirconia thermal barrier coating (TBC), deposited on a (Ni Pt) Al bond coating. The thermally grown oxide (TGO) layer that forms between the TBC and bond coat at high temperature is unstable with respect to out of plane displacement, provided initial perturbations are present. With cyclic thermal exposure, the TGO displaces into the bond coat at periodic interfacial sites. The out-of-plane displacements induce strains above the TGO, normal to the interface, that cause cracking. The cracks nucleate either within the TBC layer or at the TBC/TGO interface, and extend laterally until they coalesce with cracks from other sites and coating failure occurs by large scale buckling. The TGO displacements are accommodated by visco-plastic deformation of the underlying bond coat, and are driven by a lateral component of the growth strain in the TGO. The susceptibility of the TGO to out-of-plane displacement depends critically upon the initial morphology of the metal/oxide interface. The observed material responses are compared with predictions of a ‘ratcheting’ model.

Real-time out-of-plane displacement measurement using displacement compensation

2019 ◽  
Vol 90 (12) ◽  
pp. 125104
Author(s):  
Wenxin Hu ◽  
Chen Xiong ◽  
Jingchao Xu ◽  
Wei Li ◽  
Hong Miao
Keyword(s):  
Real Time ◽  
Displacement Measurement ◽  
Time Out ◽  
Out Of Plane ◽  
Plane Displacement
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