Accepted Papers
NUMERICAL SIMULATION OF VIBRATIONRELATED DEFORMATION OF A RAILWAY LOCOMOTIVE HEADLIGHT: VISUALIZATION OF THE RESULTS
S.R. Abulkhanov, N.L. Kazanskiy, Yu.S. Strelkov
Accepted: 20.07.2017
We propose a technique for conducting a comparative analysis of locomotive headlight designs with different light sources. The technique involves a number of stages of numerical analysis for modeling the impact of vibrationrelated deformations characteristic of the locomotive in motion on the reliability and photometric characteristics of the headlight. The main stages of this analysis are: creating a 3D model of the analyzed lighting device; determining the natural frequencies of the device based on the use of ANSYS Workbench program; modeling deformations of the device at its natural frequencies; analysis of the contribution of deformations of components in the largest deformation of the entire device; based on the calculation of the ray tracing the analysis of functioning the lighting device in conditions of the greatest strain. Based on the technique proposed, we investigated the different designs of the locomotive headlight: 1) with bulb as light source; 2) with LEDs as light source; 3) with LEDs mounted on a perforated substrate; 4) with LEDs on the perforated substrate reinforced with ribs. Thus, we offer a solution to the problem of joint analysis of searchlight vibration loads and quality of directivity diagram formed by the headlight. A key element of the analysis is the use of dynamic visualization of the vibration oscillations for the headlight and of formed (under a maximum distortion of the searchlight structure) light beam.
EVALUATIONS OF VISUALIZATION METAPHORS AND VIEWS IN THE CONTEXT OF EXECUTION TRACES AND CALL GRAPHS
V.L. Averbukh, M.O. Bakhterev, D.V. Manakov
Accepted: 07.07.2017
In this paper approaches to the evaluation of metaphors and view of Software Visualization systems are considered on the examples of representation of call graphs and execution traces of parallel programs. Execution traces map the dynamics of the certain program executions. Visualization and “replaying” of execution traces are important elements of debugging systems. The visual presentations of the Call Graph are widely used in the systems parallel program performance tuning systems. The visualization metaphors using to depict call graphs and execution traces are surveyed. “Traditional” (for example the City metaphor) and new (for example the Brain metaphor) metaphors are considered. The validity of visualization techniques is studied on basis of analysis of metaphor properties. It is important to understand what objects may be represented with one or another metaphor. The possibility of the visualization metaphors (for example City and Molecule metaphors) to represent large and huge volumes of data is analyzed. Shneiderman’s scheme is considered as method of evaluation of visualization. B. Shneiderman presents seven high level users needs that an information visualization application should support. (Overview, Zoom, Filter, Detailsondemand, Relate, History, Extract) The use of the Schneiderman's scheme presupposes the existence of large structured data volumes. Further some other approaches to the evaluation of metaphors and views are considered. Among them are the criterion mental structure conservation and the evaluation of system implementation efforts. The problems of Software Visualization for parallel computing are observed. The formalization of parallel computing and in particular performance tuning may be useful to resolve problems of Software Visualization.
VISUALIZATION AND RECOGNITION OF THE PARTICLE TRACKS BY METHODS OF COHERENT LASER HOLOGRAPHY
A.I. Larkin
Accepted: 05.07.2017
The present article opens a series of publications related to the application of Photonics to visualize results in experimental physics. This report is devoted to the analysis of experimental results using methods of coherent laser holography for common tasks event detection in the tracking detectors of elementary particles. Considers the possibility of threedimensional holographic imaging and optical correlators with coherent laser light. It justifies the use of holographic systems for recognition of events recorded in tracking detectors at the stage of primary selection on the form or intensity of the signal correlation. The expediency of transformation of the laser radiation coherence and the transition to optical imaging and processing by radiation with partial spatial coherence is justified.
VISUALIZATION OF FLOW PARAMETERS IN BRANCHED SYSTEMS USING A TREELIKE GRAPHS (THE FLOW IN THE PIPELINE)
S.A. Gubin, S.I. Sumskoi, A.M. Sverchkov, A.A. Agapov, D.Yu. Okunev
Accepted: 03.07.2017
An approach to the visualization of flow parameters in branched systems (for onedimensional case) is described. It is proposed to consider all the flow parameters as a function of a single variable  the distance from the start point of the system. In this case, functions, that are continuous in the branching points, can be presented as a treelike structure, that gives us a convenient way to perceive all the spacetime pictures of the flow.
The proposed approach is applied to the visualization of flow parameters obtained by solving the water hammer problem in branching pipes. The mathematical model of water hammer is described, the results of water hammer modeling are presented. The visualizations of the data obtained are provided in the form of snapshots and movies.
VISUALIZATION OF CRITERIAL FUNCTION PARAMETERS OPTIMISATION PROCESS IN MEDICAL DIAGNOSIS PROBLEM
I.D. Kolesin, O.A. Troyanozhko, P.P. Sivashhenko
Accepted: 30.06.2017
This article is dedicated to the scientific visualization method for the task of big data analysis. With the help of well proved methods of visual analytics the approach undertaken was directed at the criterial function optimization in medical diagnostics problems. The visual method being used makes it possible to represent error function and analyze its behavior in 2D and 3D, solving the problem of optimal classification of two sets. The visualization method made it possible to reveal a variety of error function characteristics which were obtained by authors as by a practical results generalization while processing medical data bases. An example of the effective use of visualization method is the application to optimize the diagnostics of breast cancer patients. At the stage of diagnostics the possibility of optimizing by predetermination the structural characteristics of the multidimensional structures in the parameter space of the linear discriminant function was investigated. As the criterion function, a discrete error function was used that registers the number of incorrectly recognized objects. Some currently used classification techniques are poorly adapted to find the minimum of medical diagnostics problems and are time and resourceconsuming. Others give a significant probability of error, that is unacceptable in the diagnostics of a particularly responsible decisionmaking area. Therefore, the authors proposed a simple and visually intuitive method to determine the structural characteristics of the error function. We used a visual method of investigation consisting of the algorithm of constructing the equal level surfaces and used them to go down to a minimum. As a result, it was shown that a sufficiently reliable diagnosis can be made, if we apply the method for visualizing the discrete error function when running on extremal to a minimum. With the help of a visualization method the software has been developed, as a result of which we get an accuracy of 94.73% when a benign tumour was separated from a malignant tumour using two diagnostic features.
ALGORITHMS FOR IDENTIFYING BOUNDARIES AND VISUALIZATION SOLUTIONS PLATEAU PROBLEM IN BLENDER ENVIRONMENT
A.A. Klyachin, V.A. Klyachin, E.G. Grigorieva
Accepted: 27.06.2017
In this paper we consider the calculation and construction of the surface having the lowest possible area with the specified edge and the value of the volume of domain that covers this surface. This problem is known from the practice of modern design constructions in which thin shell are often used as coatings or protections. Therefore, one has to solve the problem: How to cover the volume, having a fixed or maximum value, for the minimum area of the its surface. In our work we mathematically formulate this variational problem and present a solution algorithm, using the solutions of the equation of constant mean curvature. The article gives a description of the software implementation of this algorithm, the images calculated surfaces with different computational domain and the boundary conditions. Accuracy of calculations on the average was 0.01%.
For the numerical solution of the classical Plateau problem it was built a mathematical model that allows to reduce the problem of minimizing the corresponding functional of the functional area type to the finitedimensional case. In order to visualize resulting solutions we consider the possibility of constructing the boundary contours directly in Blender modeling environment. At the same time, the article demonstrates two algorithms for the identification of such circuits for multifaceted surfaces of an arbitrary topological structure. The implementation of the mentioned algorithms in the simulation environment allows us to calculate of the surface with a minimum value of the functional in interactive mode, and the calculation results are stored in a convenient 3D format. Currently, the builtin module is placed in the public domain on GitHub server and includes the implementation of algorithms for the calculation of minimal surfaces, the capillary surfaces and surfaces of constant mean curvature.
BACKGROUNDORIENTED SCHLIEREN METHOD FOR RECORDING OF AIR SHOCK WAVES
S.I. Gerasimov, N.À. Trepalov
Accepted: 01.06.2017
The basic dangerous parameters characterizing air shock wave are peak overpressure and explosive impulse. For these purposes pressure gages are usually used. Optical methods imply alternative technique. Optical diagnostics owing to noncontact applying, absence of influence on parameters of object under studying have a series of advantages that allows one to perform measurements. Experimental measurements of shock wave propagation from explosions of different energetic materials are presented. Each test is recorded with a highspeed digital video camera and the shock wave is visualized using backgroundoriented schlieren method.
IMPROVEMENT OF THE QUALITY OF RESTORING IMAGE WITH RADON INVERSE TRANSFORM
K.Ya. Kudryavtsev
Accepted: 20.05.2017
The creation of the image of internal contents of object without its physical corrupting applied in medicine, metallurgy and crystallography is based on Xray radiation with the subsequent mathematical processing of received data. When the object is being scanned, the output ray intensity is equal to density distribution function along the ray path. Registration of emission calculated at different angles allows to obtain the original data used to reconstruct the image. Data used for image reconstruction has the form of matrix, each element of which is the result of integral evaluation along the determined line. The bigger matrix is, i.e. the more experimental data is available, the more exact image reconstruction will be possible. However, the number of experiments is often limited by medical, technical, economic and other reasons. As a mathematical tool for the reconstruction of the crosssectional image of an object, a direct and inverse Radon transform is used. This paper proposes the algorithm of rising the quality of reconstructed image from Radon transform matrix by adding additional colums containing Radon transform in interjacent angle turn calculated with the help of developed approximation formulas. Doubling the number of Radon integral transformation matrix colums helps to significantly rise the quality of image being reconstructed with Radon inverse transformation.
CONCEPTION AND DEVELOPMENT EXPERIENCE OF "SINUSD" SOFTWARE FOR RAPID VISUALIZATION OF DYNAMIC SYSTEMS SIMULATION
S.V. Ktitrov
Accepted: 10.05.2017
"SINUSD" is software designed for rapid visualization of numerical simulation of nonlinear dynamic systems. The primarily area of using the software is analysis and synthesis of nonlinear discretecontinuous automatic control systems including systems with delay. It determines the class of equations to be solved. The software builds the numerical solution of nonlinear differential and difference equations of arbitrary structure specified by text strings. Variable names can contain characters of various alphabets including Greek which makes the equations writing similar to it representation in the subject area. Many typical nonlinear elements including twovalued nonlinearities, random variables, extrapolator, pure delay are implemented. This article is focused on details of software design and implemented algorithms including the design of the expression interpreter and a computing subsystem.
The graphics subsystem is described in details. It is designed to present the simulation results operatively. A lot of possibilities of graphic canvas include precise coordinate detection, line and coordinate grid properties control and others. Examples of its use for visualization and comparative analysis of transient processes and phase portraits are presented.
The means implemented for harmonic analysis of processes are presented. That helps to research the approximation quality by the partial sums of the Fourier series and the contribution of individual harmonics to the waveform shaping.
The conception of the software design includes its compactness and the possibility of using various software platforms. The software is single file compiled for Microsoft Windows, Apple OS X and Linux. It uses common text file format for all platforms. Installation is not required.
The suggested approach to development the similar programs is based on a combination of builtin equations parser along with previously implemented set of typical nonlinear elements and intuitive interface.
