Experimental methodology for the dynamic analysis of slender structures based on digital image processing techniques

Jurjo, Daniel Leonardo B.R.; Magluta, Carlos; Roitman, Ney; Gonçalves, Paulo B.

doi:10.1016/j.ymssp.2009.12.006

Cited by 45 publications

(23 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To estimate the stresses, it is necessary to obtain the elastic constants E and C. These constants are determined by fitting the experimental stress-strain curve using the least squares method, which minimizes the possible errors in the determination of the experimental stresses [28,29]. With the estimated stress values, it is possible to obtain the average forces on different sections of the membrane in the x and y directions and to correlate them with the force values measured throughout the test using a load cell.…”

Section: Results Inmentioning

confidence: 99%

“…Additionally, this system allows adjustments of the camera such as zoom, focus, and image capture mode switching (frame or field), among other functions, to be performed via programming. A detailed description of the vision system can be found in [28,29].…”

Section: Experimental Methodologymentioning

confidence: 99%

“…For this reason, there is a growing interest in the development of alternative experimental displacement measurement techniques without contact with the structure, such as the use of imaging with a computer vision system as a movement sensor, as shown in Refs. [27][28][29][30][31][32][33][34][35]. There are also interferometry techniques, such as speckle interferometry, speckle photography and hologram interferometry [36][37][38][39][40][41][42].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Analysis of the structural behavior of a membrane using digital image processing

Jurjo

Magluta

Roitman

et al. 2015

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

Section: Results Inmentioning

confidence: 99%

Section: Experimental Methodologymentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the structural behavior of a membrane using digital image processing

Jurjo

Magluta

Roitman

et al. 2015

Mechanical Systems and Signal Processing

View full text Add to dashboard Cite

“…Studies have already applied photogrammetric monitoring to tests utilising dynamic techniques (Olaszek, 1999;Jurjo et al, 2010;Choi et al, 2011). The principle has remained the same, but imaging frequency is increased to many frames per second in order to capture vibrations.…”

Section: Photogrammetric Monitoring Of Structural Dynamicsmentioning

confidence: 99%

3D Case Studies of Monitoring Dynamic Structural Tests using Long Exposure Imagery

McCarthy

Chandler

Palmeri

2014

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:Structural health monitoring uses non-destructive testing programmes to detect long-term degradation phenomena in civil engineering structures. Structural testing may also be carried out to assess a structure's integrity following a potentially damaging event. Such investigations are increasingly carried out with vibration techniques, in which the structural response to artificial or natural excitations is recorded and analysed from a number of monitoring locations. Photogrammetry is of particular interest here since a very high number of monitoring locations can be measured using just a few images. To achieve the necessary imaging frequency to capture the vibration, it has been necessary to reduce the image resolution at the cost of spatial measurement accuracy. Even specialist sensors are limited by a compromise between sensor resolution and imaging frequency.To alleviate this compromise, a different approach has been developed and is described in this paper. Instead of using high-speed imaging to capture the instantaneous position at each epoch, long-exposure images are instead used, in which the localised image of the object becomes blurred. The approach has been extended to create 3D displacement vectors for each target point via multiple camera locations, which allows the simultaneous detection of transverse and torsional mode shapes. The proposed approach is frequency invariant allowing monitoring of higher modal frequencies irrespective of a sampling frequency. Since there is no requirement for imaging frequency, a higher image resolution is possible for the most accurate spatial measurement. The results of a small scale laboratory test using off-the-shelf consumer cameras are demonstrated. A larger experiment also demonstrates the scalability of the approach.

show abstract

“…Experimental analysis of the dynamic behavior of slender columns to verify the influence of the self-weight was performed by Jurjo et al [9], who tested clamped-free slender metallic columns subjected to large displacements and rotations under both tension and compression. The tests were performed for columns of different lengths, both larger and smaller than the critical buckling length.…”

Section: Introductionmentioning

confidence: 99%

Initial undamped resonant frequency of slender structures considering nonlinear geometric effects: the case of a 60.8 m-high mobile phone mast

Wahrhaftig

Brasil

2016

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

Experimental methodology for the dynamic analysis of slender structures based on digital image processing techniques

Cited by 45 publications

References 32 publications

Analysis of the structural behavior of a membrane using digital image processing

Analysis of the structural behavior of a membrane using digital image processing

3D Case Studies of Monitoring Dynamic Structural Tests using Long Exposure Imagery

Initial undamped resonant frequency of slender structures considering nonlinear geometric effects: the case of a 60.8 m-high mobile phone mast

Contact Info

Product

Resources

About