scholarly journals Implicit 3D Modeling of Ore Body from Geological Boreholes Data Using Hermite Radial Basis Functions

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 443 ◽  
Author(s):  
Jinmiao Wang ◽  
Hui Zhao ◽  
Lin Bi ◽  
Liguan Wang
Keyword(s):  
Three Dimensional ◽  
Hole Drilling ◽  
Weak Continuity ◽  
Three Dimensional Model ◽  
Borehole Data ◽  
Long Distance ◽  
Hole Drilling Method ◽  
Ore Body ◽  
Radial Basis ◽  
Geometric Quality

Modeling ore body in 3D is the basis of digital intelligent mining. However, most existing three-dimensional mining software uses the contour approach that requires too much man–machine interaction and difficult partial updating. Moreover, accounting for uncertainty and low geometric quality picking is very difficult in the direct contour approach. Therefore, an implicit modeling approach to automatically build the three-dimensional model for ore body by means of spatial interpolation directly based on the geological borehole data with Hermite radial basis function (HRBF) algorithm as the core is proposed. Furthermore, in order to solve the problems of weak continuity of models due to the long-distance original boreholes as well as the boundary-point normal solution error, the densification of original borehole data with the virtual borehole as well as the calculation of point-cloud normal direction based on the adjacent hole-drilling method is proposed. The verification of two mine engineering projects and comparison with the explicit modeling results show that this approach could realize the automatic building of three-dimensional models for the ore body with high geometric quality, timely update and accurate results.

On the Improvement of Calibration Coefficients for Hole-Drilling Integral Method: Part II—Experimental Validation of Calibration Coefficients

2003 ◽  
Vol 125 (2) ◽  
pp. 107-115 ◽  
Author(s):  
Jong-Ning Aoh ◽  
Chung-Sheng Wei
Keyword(s):  
Experimental Validation ◽  
Three Dimensional ◽  
Bending Test ◽  
Hole Drilling ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Fem Model ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
Calibration Coefficients

Experimental validation of the calibration coefficients for integral hole-drilling method obtained from an improved three-dimensional FEM model was achieved using bending test of a cantilever beam. The experimental setup is a simple yet accurate method to validate the calibration coefficients obtained by a three-dimensional FEM model. With this experiment, we also validate the adequacy of the criterion applied for thin or thick plates in a previous work. The relieved stresses calculated from the calibration coefficients of the three-dimensional FEM model were compared with those calculated from two-dimensional model calibration coefficients. The results show that the accuracy of relieved stress calculation has been greatly improved as the calibration coefficients based on a three-dimensional model are used for integral hole-drilling method. Significant error in the residual stress measurement and calculation could be arisen if calibration coefficients for integral hole-drilling method were not chosen correctly for corresponding thin plate or thick plate cases according the results of the bending test of cantilever beam. A transitional dimensionless thickness was proposed by examining the calculated relieved stresses obtained from the calibration coefficients for different plate thickness. The probability bounds of relieved stress corresponding to both cases were also calculated to further reveal the improvement of the calibration coefficients obtained from the three-dimensional model.

On the Improvement of Calibration Coefficients for Hole-Drilling Integral Method: Part I—Analysis of Calibration Coefficients Obtained by a 3-D FEM Model

2002 ◽  
Vol 124 (2) ◽  
pp. 250-258 ◽  
Author(s):  
Jong-Ning Aoh ◽  
Chung-Sheng Wei
Keyword(s):  
Integral Method ◽  
Plate Thickness ◽  
Three Dimensional ◽  
Thin Plates ◽  
Calibration Coefficient ◽  
Hole Drilling ◽  
Three Dimensional Model ◽  
Hole Drilling Method ◽  
Wide Range ◽  
Calibration Coefficients

One of the important factors affecting the accuracy of stress values obtained from the hole-drilling method is the calibration coefficient. A three-dimensional model was established to determine the calibration coefficients for integral method. The constraint conditions and loading conditions during hole-drilling can be simulated more realistically with this method. With this new model, coefficients a¯i,j and b¯i,j could be determined within one computation procedure. The relationship between calibration coefficients and plate thickness was investigated over a wide range of plate thickness. It has been found that the calibration coefficients determined in this work may vary with thickness of plates and the thickness range for thin plates was thus well defined. The calibration coefficients can thus be extended to measure the residual stresses of either thin or thick plates. Comparison of calibration coefficients with those determined by other studies was also conducted.

Research and Application of the 3D Mathematic Model of Ore-Body Based on Suppac Software - Yunnan White Cattle Factory Silver Polymetallic Mine

2013 ◽  
Vol 868 ◽  
pp. 84-87
Author(s):  
Ying Ling Li ◽  
Jian Guo Gao
Keyword(s):  
Body Position ◽  
Three Dimensional ◽  
Estimation Method ◽  
Mineral Resources ◽  
Mathematic Model ◽  
Mineral Deposit ◽  
Three Dimensional Model ◽  
Ore Body ◽  
White Cattle ◽  
Three Dimensional Models

Three-dimensional models of deposit are the foundation of realizing digital mineral deposit , with the aid of mining software Surpac,it can establish deposit database, the three dimensional model of the mining surface,,orebody and roadway of the yunnan white cow factory silver polymetallic deposit.The 3D model can show the vivid image of the mining topography and geomorphology, ore body position, gallery situation. The ore model of orebody grade founding by kriging can show the distribution change of orebody grade clearly, and finally estimate the amount of ore body. Comparing with the traditional estimation method of exploration report, we can find the estimation of mineral resources by software is accurate.

Study of Surface Residual Stress by Three-Dimensional Displacement Data at a Single Point in Hole Drilling Method

1999 ◽  
Vol 122 (2) ◽  
pp. 215-220 ◽  
Author(s):  
Z. Wu ◽  
J. Lu
Keyword(s):  
Residual Stress ◽  
Single Point ◽  
Accurate Determination ◽  
Three Dimensional ◽  
Moiré Interferometry ◽  
Hole Drilling ◽  
Moire Interferometry ◽  
Blind Hole ◽  
Hole Drilling Method ◽  
Drilling Method

A method combining moire´ interferometry, Twyman–Green interferometry, and blind hole drilling method is proposed for simple and accurate determination of residual stress. The relationship between the three-dimensional surface displacements produced by introducing a blind hole and the corresponding residual stress is established by employing the Fourier expansion solution containing a set of undetermined coefficients. The coefficients are calibrated by 3D finite element method. The surface in-plane displacements Ux,Uy, and the out-of-plane displacement Uz produced by the relaxation of residual stress are measured by moire´ interferometry and Twyman–Green interferometry, respectively, after the hole-drilling procedure. The complete three-dimensional displacement data at any single point around the hole can be used for residual stress determination. The accuracy of the method is analyzed and the experimental procedure is described to determine the sign of residual stresses. As an implementation of the method, a shot peening residual stress problem is studied. [S0094-4289(00)00802-1]

The Parametric Analysis of the Threshold Value Judging Mechanism in MEMS Safety and Arming Device

2015 ◽  
Vol 645-646 ◽  
pp. 968-971
Author(s):  
Fu Fu Wang ◽  
Wen Zhong Lou ◽  
Fang Yi Liu ◽  
Da Kui Wang ◽  
Ming Rong Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Threshold Value ◽  
Element Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Long Distance ◽  
And Control ◽  
The Mathematical Model ◽  
The Finite Element Model

In this paper, a mechanical MEMS S&A device has been proposed. The size of the device is 10mm×13mm×0.5mm. The role of the threshold value judging mechanism is to determine the environment suffered by centrifugal force and control the sub-centrifugal slider not movement under the threshold, so as to effectively guarantee the time of long-distance arming. Through establishing the three-dimensional model of threshold value judging mechanism, establishing the force and the parameters of locking-releasing mechanism, deriving the mathematical model according to the rigid dynamic mechanics theory and establishing the finite element model by using ANSYS/LS-DYNA, appropriate threshold value judging mechanism is designed to meet two items, one item is the deformation of threshold value rod is not enough to release sub-centrifugal slider when the speed is less than 60000r/min; the other item is deformation of threshold value rod can release sub-centrifugal slider when the speed is more than 60000r/min.

scholarly journals Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1281 ◽  
Author(s):  
Gaurav Singh ◽  
Bijit Kalita ◽  
K. I. Vishnu Narayanan ◽  
Umesh Kumar Arora ◽  
Manas M. Mahapatra ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Nuclear Power ◽  
Zirconium Alloy ◽  
True Strain ◽  
Three Dimensional ◽  
Element Model ◽  
Hole Drilling ◽  
Element Analysis ◽  
Hole Drilling Method

Zirconium alloy has been extensively used as a cladding material in nuclear power reactors due to its low neutron absorption cross section, excellent mechanical properties, and corrosion resistance. The influence of the swaging parameter, feed rate (0.7, 1.25, 2 m/min) on residual stress induced in Zr-4 alloy is investigated in the present work. A three-dimensional finite element model was implemented in the Deform 3D software to simulate the rotary swaging (RS) process over a circular rod of Zr-4 alloy. The simulation results based on the 3D framework provide a detailed insight of residual stress, true stress versus true strain and force applied over the rod during the multiple pass swaging process; the results are compared with experimental results. The experimental hole drilling method is used to determine the residual stresses on swaged zirconium alloy at different feed rates (0.7, 1.25, and 2 m/min). A similar trend of residual stress between experimental and numerical results from the surface to the center on the swaged rod samples is observed. The same magnitude of residual stress at the surface of the swaged Zr-4 rod is also observed. It is found to be compressive at the surface and tensile in the center of the samples, as observed in the present work.

scholarly journals Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses

2018 ◽  
Vol 53 (4) ◽  
pp. 210-224 ◽  
Author(s):  
Michele Barsanti ◽  
Marco Beghini ◽  
Ciro Santus ◽  
Alessio Benincasa ◽  
Lorenzo Bertelli
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Integral Method ◽  
Three Dimensional ◽  
Element Model ◽  
Hole Drilling ◽  
Stress Distributions ◽  
Three Dimensional Model ◽  
Small Depth ◽  
Ring Core

The ring-core technique allows for the determination of non-uniform residual stresses from the surface up to relatively higher depths as compared to the hole-drilling technique. The integral method, which is usually applied to hole-drilling, can also be used for elaborating the results of the ring-core test since these two experimental techniques share the axisymmetric geometry and the 0°–45°–90° layout of the strain gage rosette. The aim of this article is to provide accurate coefficients which can be used for evaluating the residual stress distribution by the ring-core integral method. The coefficients have been obtained by elaborating the results of a very refined plane harmonic axisymmetric finite element model and verified with an independent three-dimensional model. The coefficients for small depth steps were initially provided, and then the values for multiple integer step depths were also derived by manipulating the high-resolution coefficient matrices, thus showing how the present results can be practically used for obtaining the residual stresses according to different depth sequences, even non-uniform. This analysis also allowed the evaluation of the eccentricity effect which turned out to be negligible due to the symmetry of the problem. An applicative example was reported in which the input of the experimentally measured relaxed strains was elaborated with different depth resolutions, and the obtained residual stress distributions were compared.

The Analysis and Experimental Verification on Static Characteristics of BTA Deep Hole Drilling Based on Ansys Software

2014 ◽  
Vol 556-562 ◽  
pp. 1178-1182 ◽  
Author(s):  
Zhen Dong ◽  
Xing Quan Shen ◽  
Huang Zhang
Keyword(s):  
Three Dimensional ◽  
Static Characteristic ◽  
Simulation Software ◽  
Hole Drilling ◽  
Deep Hole ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Deep Hole Drilling ◽  
Ansys Simulation ◽  
Drilling Simulation

Build a three-dimensional model of BTA deep hole drilling, simulation the static characteristic of the three-dimensional model using Ansys simulation software,observed the wear condition of the BTA drilling teeth, middle teeth and side teeth in the Experiment,verify the results of simulation,providing a basis for the BTA drilling structural optimization.

Implicit Simulation for Three-Dimensional Spatial Morphology of Geological Body Based on Marching Cubes Algorithm

2012 ◽  
Vol 195-196 ◽  
pp. 807-813 ◽  
Author(s):  
Yan Hong Zou ◽  
Jian Chun He ◽  
Ming Lei Ding
Keyword(s):  
Interpolation Method ◽  
Three Dimensional ◽  
Marching Cubes ◽  
Three Dimensional Model ◽  
Borehole Data ◽  
Geological Investigation ◽  
Geological Body ◽  
Marching Cubes Algorithm ◽  
Spatial Morphology ◽  
Visualization Technology

Due to the discrete and incomplete sample data for the geological body in geological investigation, it is difficult to construct the three-dimensional model of geological body. Therefore, based on data interpolation, we propose a method to implement the three-dimensional implicit simulation for the geological body by programming with marching cubes algorithm. Firstly, the spatial interpolation method is used to predict the distribution trend of geological body and the three-dimensional spatial regular data field for the geological body is established. Secondly, the three-dimensional isosurface of geological body is extracted from discrete points by the marching cubes algorithm. Finally, combining with three-dimensional visualization technology of OpenGL, three-dimensional spatial morphology of geological body is simulated by tiny triangle approximation in computer graphics. Taken the borehole data in exploration engineering as example, this method is applied to develop the three-dimensional implicit simulation for ore body. The result of implicit simulation is close to the delineation of explicit simulation by human-computer interaction in three-dimensional geological modeling software. It shows that this method is feasible and efficient for the three-dimensional simulation of geological body.

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