Climber-Inspired Fuzzy Logic Approach to Crack Localization Using Image Analysis

Petřík, Martin

doi:10.3151/jact.13.103

Cited by 3 publications

(1 citation statement)

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“…The concrete specimens were prepared by etching and sanding to reveal the pores that were hidden just below the surface. The use of digital image processing and analysis is a common practice in concrete surface evaluation (Da Silva and Štemberk 2013;Petřík 2015). However, a particular challenge encountered in this research was the identification and quantification of pores while accounting for the confounding factor of small aggregate particles that may mimic the appearance of pores.…”

Section: Surface Quality Evaluationmentioning

confidence: 99%

Exploration of Advanced Fabrication Techniques for Organic Shaped Energy Dissipators in Spillways

Petřík

Štemberk

Zukal

2023

ACT

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This paper focuses on the advanced design and production of concrete energy dissipators which are used for aeration of water on spillways. Traditionally, the concrete energy dissipators assumed simple block shapes which were dictated by limited production capabilities, mainly by the planar formwork and issues related to demolding. The advent of new concrete mix design and flexible construction technologies, such as 3D printing and CNC machines, allowed to consider more optimized organic shapes for increasing the energy dissipation efficiency and reducing the volume of material in our case by 38%. Since the physical laboratory modeling is an integral part of hydraulic research, a prototyping method using small-scale models was developed for design, production, quality control and experimental assessment of concrete energy dissipators of complex shapes. This method helps to expedite the research process when newly designed or modified shapes can be readily produced and tested in the hydraulic test channel for its energy dissipation efficiency and erosion resistance. The digital production, as all geometric information is perfectly digitized, at the same time helps to define the numerical models of the spillways for advanced continuum fluid dynamics analyses.

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Section: Surface Quality Evaluationmentioning

confidence: 99%

Exploration of Advanced Fabrication Techniques for Organic Shaped Energy Dissipators in Spillways

Petřík

Štemberk

Zukal

2023

ACT

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Visual-Based Crack Detection and Skeleton Extraction of Cement Surface

Sun

et al. 2019

Intelligent Robotics and Applications

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In order to realize the design of vision-based cement crack repair robot, it is necessary to accurately recognize and extract features of cracks. In this paper, three kinds of typical crack are selected to study, which are fine crack, reticulated crack and dark crack. Firstly, image filtering and image enhancement are used to pre-process the collected image to reduce the influence of noise on detection and enhance the contrast between image background and crack area. Then, the multi-scale morphological operation is applied to extract the fracture edge features effectively. The experimental results show that the proposed edge regions are obviously different from the background regions. Furthermore, by calculating and selecting the area of the largest connected area, the noise can be eliminated to the greatest extent. Finally, the traditional skeleton extraction algorithm is improved to eliminate the number of burrs in the traditional skeleton algorithm. By remapping the cracks images to color images, it can be found that the crack recognition and skeleton extraction meet the requirements, which can provide corresponding technical support for the navigation design of the crack repair robot.

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