Image Processing and Edge Detection Techniques to Quantify Shock Wave Dynamics Experiments

Zheng, Lingzhi; Lawlor, Barry; Katko, Benjamin J.; McGuire, Claire V.; Zanteson, Jane; Eliasson, Veronica

doi:10.1007/s40799-020-00415-3

Cited by 13 publications

(6 citation statements)

References 5 publications

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“…Although reflected waves and secondary shocks meet in Figure 4(f) and (g), they continue to spread along the original trajectory and curvature of blast waves, it seems that the gas did not collide, this phenomenon was also clearly captured in previous experiments (Zaghloul et al, 2021; Zheng et al, 2021). It can be seen from the pressure distribution in Figure 10(c), this phenomenon can be explained as two waves merge to form a high-pressure area and then spread to the surroundings with less energy loss.…”

Section: Simulation Studiessupporting

confidence: 57%

“…Obviously, under such complex blast conditions, traditional pen gauges are difficult to arrange due to the uncertain direction of blast waves, optical testing (Knock et al, 2015; McNesby et al, 2014; Wu et al, 2010) is a more intuitive and accurate method, and the morphology of blast waves in the air can be recorded without interference. Images of fireballs (Rigby et al, 2020; Zheng et al, 2021) and blast waves (Gitterman, 2013; Mizukaki et al, 2013) can be used to analyze the formation mechanism of blast loads and check numerical models better.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and simulation study on blast loads of cylindrical Shells

Wei

Zheng

Yang

et al. 2022

Advances in Structural Engineering

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Public buildings that house large populations are easy targets for terrorist attacks, the primary issue of architectural blast-resistant design is how to get blast loads on the surface of structures, and the shapes of blast waves and buildings both have important effects on it. In this paper, experiments and numerical simulations were carried out on blast loads on the surface of the cylindrical shell. blast loads, detonation products, and blast waves were well recorded and simulated, blast loads at the edge of cylindrical shells were attenuated by about 75%, and vortex rings were accidentally photographed nearby. blast loads are much affected by the location of the detonation point, charge shape, and charge size. The original shape of structures rather than deformation determines the distribution of blast loads, the air viscosity also needs to be scaled when using a scaled model to test blast loads. Experimental and simulation methods can offer a reference for building a standard database of blast loads.

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Section: Simulation Studiessupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Experimental and simulation study on blast loads of cylindrical Shells

Wei

Zheng

Yang

et al. 2022

Advances in Structural Engineering

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“…The schlieren imaging was post-processed in order to automate feature tracking (e.g., edge detection) of shock fronts. The algorithms used are detailed in the previous work of Zheng et al [126]. The processed schlieren photographs were compared against simulated frames at the same time after detonation.…”

Section: Schlieren Imagingmentioning

confidence: 99%

A Review of Blast Loading in the Urban Environment

et al. 2023

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Urban blasts have become a significant concern in recent years. Whilst free-field blasts are well understood, the introduction of an urban setting (or any complex geometry) gives rise to multiple blast wave interactions and unique flow complexities, significantly increasing the difficulty of loading predictions. This review identifies commonly agreed-upon concepts or behaviours that are utilised to describe urban shock wave propagation, such as channelling and shielding, in conjunction with exploring urban characterisation metrics that aim to predict the effects on global blast loading for an urban blast. Likewise, discrepancies and contradictions are highlighted to promote key areas that require further work and clarification. Multiple numerical modelling programmes are acknowledged to showcase their ability to act as a means of validation and a preliminary testing tool. The findings contained within this review aim to inform future research decisions and topics better.

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“…Using mathematical morphology for image processing, in addition to the flexible combination of the four basic operations, different structural elements can also have an impact on edge detection [13]. Moreover, for the extraction of edges using expansion etching, a structural element will only significantly work on edges that are perpendicular to it.…”

Section: Pixel-level Edge Algorithm Based On Noise-resistant Mathematical Morphologymentioning

confidence: 99%

Research on O-ring Dimension Measurement Algorithm Based on Cubic Spline Interpolation

Zheng

Yin

et al. 2021

Applied Sciences

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Current O-ring dimension measurement algorithms based on machine vision are mainly whole-pixel level algorithms, which have the disadvantage of a low measurement accuracy. In order to improve the stability and accuracy of O-ring dimension measurement, a sub-pixel edge detection algorithm based on cubic spline interpolation is proposed for O-ring dimension measurement. After image pre-processing of the O-ring graphics, the whole-pixel-level O-ring edges are obtained by using a noise-resistant mathematical morphology method, and then the sub-pixel edge contours are obtained using a sub-pixel edge detection algorithm based on cubic spline interpolation. Finally, the edge curve is fitted with the least squares method to obtain its inner and outer diameter as well as the size of the wire diameter. The experimental data show that the algorithm has a mean square error of 4.8 μm for the outer diameter and 0.18 μm for the wire diameter. The outer diameter error is kept within ± 100 μm and the wire diameter error can be kept within ±15 μm. Compared with the whole pixel algorithm, the measurement accuracy has been greatly improved.

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Image Processing and Edge Detection Techniques to Quantify Shock Wave Dynamics Experiments

Cited by 13 publications

References 5 publications

Experimental and simulation study on blast loads of cylindrical Shells

Experimental and simulation study on blast loads of cylindrical Shells

A Review of Blast Loading in the Urban Environment

Research on O-ring Dimension Measurement Algorithm Based on Cubic Spline Interpolation

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