Full Field Analysis Of Modal Domain Sensor Signals For Structural Control

1989 ◽  
Author(s):  
K. D. Bennett ◽  
J. C. McKeeman ◽  
R. G. May
Keyword(s):  
Structural Control ◽  
Field Analysis ◽  
Full Field ◽  
Sensor Signals

scholarly journals OVERVIEW OF OPEN SOURCE SOFTWARE FOR CLOSE RANGE PHOTOGRAMMETRY

2019 ◽  
Vol XLII-4/W14 ◽  
pp. 239-245 ◽  
Author(s):  
G. Vacca
Keyword(s):  
Open Source ◽  
Camera Calibration ◽  
Open Source Software ◽  
Point Cloud ◽  
Ground Level ◽  
Point Clouds ◽  
Field Analysis ◽  
Full Field ◽  
Close Range ◽  
Image Orientation

<p><strong>Abstract.</strong> In the photogrammetric process of the 3D reconstruction of an object or a building, multi-image orientation is one of the most important tasks that often include simultaneous camera calibration. The accuracy of image orientation and camera calibration significantly affects the quality and accuracy of all subsequent photogrammetric processes, such as determining the spatial coordinates of individual points or 3D modeling. In the context of artificial vision, the full-field analysis procedure is used, which leads to the so-called Strcture from Motion (SfM), which includes the simultaneous determination of the camera's internal and external orientation parameters and the 3D model. The procedures were designed and developed by means of a photogrammetric system, but the greatest development and innovation of these procedures originated from the computer vision from the late 90s, together with the SfM method. The reconstructions on this method have been useful for visualization purposes and not for photogrammetry and mapping. Thanks to advances in computer technology and computer performance, a large number of images can be automatically oriented in a coordinate system arbitrarily defined by different algorithms, often available in open source software (VisualSFM, Bundler, PMVS2, CMVS, etc.) or in the form of Web services (Microsoft Photosynth, Autodesk 123D Catch, My3DScanner, etc.). However, it is important to obtain an assessment of the accuracy and reliability of these automated procedures. This paper presents the results obtained from the dome low close range photogrammetric surveys and processed with some open source software using the Structure from Motion approach: VisualSfM, OpenDroneMap (ODM) and Regard3D. Photogrammetric surveys have also been processed with the Photoscan commercial software by Agisoft.</p><p>For the photogrammetric survey we used the digital camera Canon EOS M3 (24.2 Megapixel, pixel size 3.72&amp;thinsp;mm). We also surveyed the dome with the Faro Focus 3D TLS. Only one scan was carried out, from ground level, at a resolution setting of &amp;frac14; with 3x quality, corresponding to a resolution of 7&amp;thinsp;mm / 10&amp;thinsp;m. Both TLS point cloud and Photoscan point cloud were used as a reference to validate the point clouds coming from VisualSFM, OpenDroneMap and Regards3D. The validation was done using the Cloud Compare open source software.</p>

Numerical Modelling of Crack Propagation and R-Curve Behaviour in Layered Al2O3/ZrO2 Composites

2009 ◽  
Vol 417-418 ◽  
pp. 769-772
Author(s):  
Michal Kotoul ◽  
Tomas Vyslouzil
Keyword(s):  
Numerical Modelling ◽  
Weight Function ◽  
Function Method ◽  
Sandwich Beam ◽  
Field Analysis ◽  
Bending Test ◽  
Full Field ◽  
Weight Function Method ◽  
Three Point Bending ◽  
Crack Penetration

The paper is devoted to numerical modelling of R-curve behaviour in laminates with strong interfaces, in particular multilayers made of alumina (A) and zirconia (Z). Contrary to previous studies based upon the application of approximate weight function method originally developed for homogeneous specimens, a full field analysis by FE of a three-point bending test of a sandwich beam is attempted and compared with the results obtained by approximate weight function method. Also the crack penetration across the layer interfaces is discussed, particularly in the case of a weak singularity.

scholarly journals Full-field analysis of epicardial strain in an in vitro porcine heart platform

2019 ◽  
Vol 91 ◽  
pp. 294-300 ◽  
Author(s):  
Paolo Ferraiuoli ◽  
Benjamin Kappler ◽  
Sjoerd van Tuijl ◽  
Marco Stijnen ◽  
Bas A.J.M. de Mol ◽  
...  
Keyword(s):  
Field Analysis ◽  
Full Field ◽  
Porcine Heart

Exact Transient Full-Field Analysis of an Antiplane Subsurface Crack Subjected to Dynamic Impact Loading

1994 ◽  
Vol 61 (3) ◽  
pp. 649-655 ◽  
Author(s):  
Chien-Ching Ma ◽  
Szu-Kuzi Chen
Keyword(s):  
Fundamental Solution ◽  
Half Space ◽  
Observation Point ◽  
Field Analysis ◽  
Full Field ◽  
Transient Solutions ◽  
Diffracted Waves ◽  
The Laplace Transform ◽  
Long Time ◽  
Close Form

The transient problem of a half-space containing a subsurface inclined semi-infinite crack subjected to dynamic antiplane loading on the boundary of the half-space has been investigated to gain insight into the phenomenon of the interaction of stress waves with material defects. The solutions are determined by superposition of the fundamental solution in the Laplace transform domain. The fundamental solution is the exponentially distributed traction on crack faces. The exact close-form transient solutions of stresses and displacement are obtained in this study. These solutions are valid for an infinitely long time and have accounted for the contributions of incident, reflected, and diffracted waves. Numerical results of the transient stresses are obtained and compared with the corresponding static values. The transient solution has been shown to approach the static value after the first few diffracted waves generated from the crack tip have passed the observation point.

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