Testing the novel method for angle of repose measurement based on area-weighted average slope of a triangular mesh

Klanfar, Mario; Korman, Tomislav; Domitrović, Dubravko; Herceg, Vjekoslav

doi:10.1016/j.powtec.2021.04.051

Cited by 16 publications

(6 citation statements)

References 21 publications

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“…The matching effect based on grayscale is not good. Klanfar et al proposed a matching method with affine invariance for tilted images [4]. In the aspect of aerial triangulation, there are three main methods of aerial triangulation, namely aerial belt net method, independent model method, and beam method.…”

Section: Literature Reviewmentioning

confidence: 99%

The Key Technology of Oblique Photogrammetry of Assembled Buildings by UAV

Yao

et al. 2022

Advances in Multimedia

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In order to ensure the disaster control during infrastructure construction and operation, a method of tilt photogrammetry of prefabricated buildings using UAV is proposed. A comparative study of the key steps in the 3D construction process of building (structure) was carried out, and a set of 3D morphology construction method based on UAV tilt photogrammetry was proposed, and the key steps were optimized to realize automation and visualization in the process of model construction. The experimental results show that in the application case of a school district, the error of the three directions is distributed between -4 cm and 4 cm, accounting for 74%, and that between -2 cm and 2 cm, accounting for 37%; the root mean square error of the three directions was calculated to be 4.0 cm, 3.8 cm, and 2.8 cm, respectively. In an engineering application case, the error size of the three directions distributed between -4 cm and 4 cm accounted for 74%, and that between -2 cm and 2 cm accounted for 50%; the root mean square error of the three directions was calculated as 2.3 cm, 2.5 cm, and 3.3 cm, respectively. Conclusion. This method can not only obtain high-precision 3D models of urban complex and single buildings, but also meet the requirements of digital city construction for 3D model construction and obtain clear and high-precision digital land surface model.

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Section: Literature Reviewmentioning

confidence: 99%

The Key Technology of Oblique Photogrammetry of Assembled Buildings by UAV

Yao

et al. 2022

Advances in Multimedia

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“…In the measurement of the repose angle, the most commonly applied method is to use a protractor or similar tool to measure the angle manually [ 36 ]. This method is simple to operate, but human subjectivity may affect the accuracy of the results.…”

Section: Methodsmentioning

confidence: 99%

“…This method is simple to operate, but human subjectivity may affect the accuracy of the results. Therefore, current measurement methods apply algorithms developed based on image analysis and coordinate measurement technology [ 36 , 37 ]. Many investigators [ 38 , 39 ] have determined the mechanical properties of materials by processing images.…”

Section: Methodsmentioning

confidence: 99%

Numerical Analysis of the Relationship between Friction Coefficient and Repose Angle of Blast Furnace Raw Materials by Discrete Element Method

et al. 2022

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In recent years, the discrete element method (DEM) has been widely used to study the factors affecting the repose angle and calibrate particle parameters for simulations. In this paper, DEM is used to study the effects of the coefficient of rolling and static friction of pellet, sinter and coke particles on the repose angle. By comparison of the results of simulations and physical experiments, the coefficients of rolling and static friction suitable for simulation work are determined. The results demonstrate that repose angle increases with the coefficient of rolling and static friction, but the rate of increase gradually decays, when the coefficient of rolling friction exceeds 0.4 or the coefficient of static friction exceeds 0.35. The coefficient of static friction has a greater impact on the repose angle than the coefficient of rolling friction. The rougher of the base surface, the larger the repose angle of the formed particle piled. It can be concluded that appropriate coefficient of rolling and static friction for simulations can be obtained by the outlined procedure.

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“…Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher. Tan et al, 2020;Klanfar et al, 2021). Among the methods described above, only the first two can be used to measure the AoR in the DEM software, and the last way is only applicable to measure the AoR of the actual object.…”

Section: Introductionmentioning

confidence: 99%

A novel method for measurement of the angle of repose of granular seeds in discrete element methods

Du,

Liu,

Liu

et al. 2023

J. Agric. Eng.

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Discrete element numerical simulations can help researchers find potential problems in the design phase, shortening the development cycle and reducing costs. In the field of agricultural engineering, more and more researchers are using discrete element methods (DEM) to assist in designing and optimising equipment parameters. Model parameters calibration is a prerequisite for discrete element numerical calculations, and the angle of repose (AoR) is commonly used to calibrate the parameters. However, the measurement of AoR in DEM was not seriously considered in industrial or academic fields. In practice, AoR is measured manually, using 2D digital image processing or using a 3D scan. However, reliable and consistent measurements of AoR in DEM are rarely mentioned. This study suggests an accurate and consistent way to measure AoR in DEM using a novel method to read particle coordinate information directly from the data file; then, the AoR is calculated by linearly fitting the centre coordinates of the outermost particles. Influences of input variables on AoR acquisition are discussed through several examples using customised templates with known angles. Then a comparative study of the accuracy of the measurement of AoR in DEM and the reliability of the parameter calibration results by the manual measurement, 2D digital image processing, and algorithm proposed in this paper was conducted. In case studies with four seed materials, this method prevented the subjective selection of AoR, improved the identification accuracy, and increased the precision and accuracy of DEM calibration. In addition, the time consumption for obtaining AoR using the novel method for measurement is much less than that of 2D.

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Testing the novel method for angle of repose measurement based on area-weighted average slope of a triangular mesh

Cited by 16 publications

References 21 publications

The Key Technology of Oblique Photogrammetry of Assembled Buildings by UAV

The Key Technology of Oblique Photogrammetry of Assembled Buildings by UAV

Numerical Analysis of the Relationship between Friction Coefficient and Repose Angle of Blast Furnace Raw Materials by Discrete Element Method

A novel method for measurement of the angle of repose of granular seeds in discrete element methods

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