
Accepted papers
Combined signed distance calculation algorithm for numerical simulation of physical processes and visualization of solid bodies movement
S.A. Soukov
Accepted: 20200912
Abstract
The article deals with the problem of initializing the field of the signed distance function to the surface of a moving solid body of arbitrary shape. A combined algorithm for fast calculation of approximate values of a function with a controlled loss of accuracy is proposed. The idea is to interpolate the function over the cells of an adaptive grid with local switching to find the distance to surface triangulation. This algorithm can be used both for visualizing the motion of surfaces and for solving various geometric problems arising in the process of numerical modeling of physical processes. The error in determining the function does not depend on the shape of the body and the features of the movement trajectory. The paper contains a description of an algorithm for generating an interpolation grid taking into account a given computational error and an algorithm for calculating the signed distance to triangulation using a binary search tree. Using the examples of processing a spherical surface and a cruise missile model, the possibility of using a combined approach for visualizing the motion of solid bodies and in numerical calculations of gasdynamic flows is demonstrated.
Visualization of energy efficiency of material use in solid deformable body
M.V. Chugunov, I.N. Polunina
Accepted: 20200912
Abstract
Among scientific visualization systems CAE (Computer Aided Engineering) postprocessor tools take a special place. Their feature is the integration with CAD (Computer Aided Design) systems that are required in the everyday activities of a design engineer. At the same time, the problem of extending (improving) of CAE postprocessors standard functionality is important, especially for research tools that allow to analyze the design solution according to various criteria.
This paper presents the Addin application for SolidWorks (Simulation), which implements the visualization of the state and behavior of a deformable solid in terms of the energy efficiency of material using. The criteria of material usage efficiency are considered.
The solution is realized in MS VisualStudio software (C ++/C#) for SolidWorks Simulation on the basis of API (Application Program Interface) and COM (Component Object Model). The Addin application expands and supplements standard SolidWorks functionality regarding for visualization of the stressstrain state and the energy criteria for the deformable solid body.
Optical Fiber Splicing Defect Segmentation Using Hybrid Active Contour
A. Azizi, Z. Azizi
Accepted: 20200907
Abstract
In this paper, we are interested to segment splicing hot (infrared) images using active contours in order to extract defects for the fiber splicing process on fiber splicer machine. The segmentation is assured by using a hybrid edge and region active contour; where region information uses local statistics to solve the problem of highlight or intensity inhomogeneity, whereas edge information based on Local Binary Patterns LBP, smoothes homogeneous regions and enhance contour information. Experimental results on hot images captured from the fiber splicer machine illustrate the effective performance of the proposed method.
Evolution of Human Computer Interaction
V.L. Averbukh
Accepted: 20200823
Abstract
The paper is concerned with the history and perspectives of the humancomputer interaction. In the first sections, the history of computing in the "precomputer" era is briefly described. Also, the early history of modern computing, methods of first computers controlling and the tasks of programmers at this stage are described. The next section is devoted to firstgeneration computers and describes such tools as panel board, punchcard and punchtape. The section devoted to the second generation computers includes the story on appearing of operational systems and programming languages. That times, the displays were invented and this leads to interactive languages and interactive debuggers. Simultaneously, the study of principles of humancomputer interactions was initiated. Additionally, here we discuss infancy of the computer graphics, development of computer graphics packages and appearance of standards of interactive computer graphics. The next section is entitled “Revolutions in computer graphics”. It is concerned with appearance of series of sametype computers and development of first supercomputers in the light of humancomputer interaction. We discuss here revolutionary changing of computer graphics and emerging of the science discipline “computer visualization” as well as its parts “scientific visualization”, “software visualization”, “information visualization” and “programming by demonstration”. Furthermore, we consider an efforts of design so called “fifth generation computers” based on logical programming. We also tell about infancy of teaching of programming in school. Important stages of the modern computing are emerging of computer nets and personal computing and parallel computers. Now, the virtual reality becomes considerable tool of computer visualization. Modern state of humancomputer interaction is marked by emerging of natural interfaces those include BrainComputer Interfaces, interfaces based on such tools as direct use of nerve impulses, speech recognition, lip reading, mimic recognition and eye tracking, motion capture, gesture analysis. Additionally, here we are to mention haptic interfaces and interfaces providing tactile feed back. We briefly describe the activity approach to the design of interfaces and some problems concerning the mass interfaces. Finally, we discuss challenges arising in the context of modern computing. The paper is of scientificpopular character and reflects the personal impressions of the author.
Computer visualization of ruled surfaces with imaginary directrix
V.A. Korotkiy
Accepted: 20200818
Abstract
In this article we consider ruled surfaces design method based on their separating from linear congruence which is set by four crossing straight lines. We offer graphic projective algorithm for constructing a real line, which is crossing imaginary directrix of elliptic linear congruence. The algorithm is based on using a graphic of imaginary points (in the form of special markers), enabling the use of imaginary points on an equal basics as real points in a process of graphics construction. To separate a surface from elliptic linear congruence we need to repeatedly apply the algorithm.
We have proved the theorem about existence of pencil of planes which are crossing linear algebraic surface of order k+2 through algebraic curves of order k (the 1st theorem). The 1st theorem allows to construct algebraic surface of order four framework, made of straight lines and curves of order two.
We have offered the options for transition from linear congruence based on four straight lines to identical congruence based on collinear fields Ï↔Ï'. Such transition allows to solve the practically important problem to construct a linear surface going through two conic sections. We have proved the theorem about existence of collineation Ï↔Ï' which is based on curves order two which are drawn in fields Ï, Ï' (the 2nd theorem).
We have considered biaxial ruled surface with constant length generators. It has been shown that such surface separates from linear congruence with real axis by immersion of a directrix ellipse into it. The eccentricity of the ellipse is determined by the angle between the congruence axes (the 3rd theorem). The technological advantage of such a surface is that they are mounted from straight beams or rods of the same size. This advantage allows to recommend them for use in architecture and construction.
We have represented the examples of computer visualization of ruled surfaces with imaginary and real directrix.
Approach to conditioning improvement in scalar calibration problem for threeaxis accelerometer module using visualization of measurement efficiency function
M. Grebenkin
Accepted: 20200811
Abstract
The paper proposes a way to optimize a set of calibration angular orientations of accelerometer module using efficiency function visualization in stationary based calibration to increase the accuracy of estimated error model parameters. It includes an analysis of mathematical model of threeaxis accelerometer module measurement errors. The method improves an estimation accuracy of parameters in analyzed model of errors. The error model encapsulates following factors: angular errors in sensor alignment within module frame of reference, deviation of sensor scalar coefficients and sensor biases. Measurement efficiency function characterize an impact of each newly made measurement on overall problem conditioning and depends on module angular position respectively to calibration reference vector. By determining minimal points of shown function, it is possible to form an optimal set of angular positions for calibrated module, which allows to achieve better conditioning of calibration problem. These minimal points are determined via optimization algorithm. Due to complex form of used function it is necessary to visualize it in order to find and set initial points of search. The approach is verified in computer simulation which shows that in comparison with nonoptimal set of angular module positions, optimal set, formed by presented method, improves estimation accuracy of considered parameters in error model in presence of errors in angular positioning of module during calibration process.
Visualization of coolant flow in the model of a nuclear reactor pressure vessel
, , ,
Accepted: 20200720
Abstract
The article is devoted to visualization of the results of experimental work aimed at studying the turbulent flow of the coolant in the model of the lower chamber of a nuclear reactor. Using the method of tracer injection into one of the four loops of coolant circulation, we studied the mixing process of coolant flow in the lower chamber of the reactor. Based on the experiment, the values of the tracer volume fraction at individual points of the model are obtained. To visualize the results, the Matlab software package was used. Obtained during the processing of the experimental data, the tracer volume fraction fields in the characteristic areas of the lower chamber model made it possible to analyze the features of the motion and mixing of the loop coolant flows. The effect of swirling the coolant flow in the lower channel and in the lower pressure chamber of the model was experimentally obtained and visualized.
Analysis of large visualization datasets for thermographic studies in fluid dynamics
, , , ,
Accepted: 20200627
Abstract
This paper reports on the visualization of nonstationary thermal fields for two experimental problems with different temporal and spatial scales using highresolution infrared (IR) thermography. We study: 1. the nearwall region of the impinging nonisothermal liquid jet and 2. the heat fluxes from the shocktube walls during the passage of the shock wave. These are the highspeed fluid dynamic processes, and their study involves obtaining and analyzing large amounts of visual data.
For the nonisothermal mixing of an impinging water jet, the flow is analyzed in the region near an IRtransparent wall. The thermograms of nonisothermal vortex flow in the nearwall region are presented. The energy spectra of temperature pulsations are computed for various regions of the walljet flow. In the gasdynamic experiment, the thermal response of the shock tube wall to the shock wave propagation is studied. The infrared imaging of surfaces with different thermal conductivity and emissivity is conducted.
The approaches are discussed for optimizing the registration and analysis of large thermographic datasets.
Solutions to recognize the table structure by an image in the absence of a priori information
N.O. Besshaposhnikov, A.G. Leonov , M.A. Matyushin
Accepted: 20200617
Abstract
In this paper we consider the problem of recognizing a table structure through the analysis of the provided picture. The problem statement is the following: suppose that we have a photo with an unknown number of particular objects captured, and we know that they are arranged in a flat table structure. We assume that the provided picture complies reasonable restrictions concerning perspective distortion and rotation magnitudes. The goal is to recognize the underlying table structure, i.e., to arrange the recognized objects into some table structure that appropriately fits the picture. From now on we call this procedure the tabulating of the objects. This paper then considers the task of tabulating objects under the conditions of the absence of any antecedent information concerning the table structure, except for the actual picture.


