New Electric Tomography Scheme and Algorithms for Fast Recognition of Compound Structures

2012 ◽  
Vol 1372 ◽  
Author(s):  
Alexandre Grebennikov
Keyword(s):  
Computer Simulation ◽  
Numerical Experiments ◽  
Electrical Tomography ◽  
Matlab Software ◽  
Measurement Scheme ◽  
Fast Recognition ◽  
Special Measurement ◽  
Computer Recognition ◽  
Tomography Scheme

ABSTRACTNecessity of recognition of compound structures appears in different applications. Electrical tomography is one of perspective approach for investigation of material structures. A new special measurement scheme in electric tomography is proposed for the domain as a circle. This scheme opens possibility to construct electric tomography apparatus with faster computer recognition of structure of compounds materials, using General Ray algorithms. Computer simulation of this scheme is realised with MATLAB software and justified by numerical experiments on examples, related with electrical tomography.

scholarly journals ROTOR SYNCHRONIZATION CONTROL OF DOUBLE-ROTOR VIBRATION UNIT UNDER STOCHASTIC LOAD

2020 ◽  
Vol 4 ◽  
pp. 49-59
Author(s):  
D.A. Tomchin ◽  
◽  
N.V. Gukov ◽  
A.A. Nersesian ◽  
T.A. Sventsitskaya ◽  
...  
Keyword(s):  
Computer Simulation ◽  
Adaptive Control ◽  
Control Algorithm ◽  
Synchronization Control ◽  
Rotor Vibration ◽  
Bulk Materials ◽  
Matlab Software ◽  
Stochastic Load ◽  
Synchronous Operation ◽  
Adaptive Control Algorithm

The paper examines the dynamics of the system for rotor synchronization control of double-rotor vi-bration unit designed for sifting bulk materials. Computer simulation in the MATLAB software envi-ronment shows that the proposed adaptive control algorithm provides a steady synchronous operation under stochastic load.

scholarly journals Analysis of dynamic properties of selected basic elements of automation of non-integer orders

2018 ◽  
Vol 19 (12) ◽  
pp. 514-525
Author(s):  
Mirosław Luft ◽  
Artur Nowocień ◽  
Daniel Pietruszczak
Keyword(s):  
Computer Simulation ◽  
Fractional Calculus ◽  
Dynamic Properties ◽  
Matlab Software ◽  
Simulation Research ◽  
Integer Order

The paper presents the application of the fractional calculus to describe the dynamics of selected basic elements of automation. For the analyzed models, the integer and non-integer order transmittance was determined. Relationships describing time characteristics were determined and frequency; on the path of computer simulation, the characteristics of the analyzed systems were obtained. MATLAB software was used for simulation research.

scholarly journals Numerical Experiments on Expanding Gravitational Systems

1974 ◽  
Vol 62 ◽  
pp. 257-257
Author(s):  
G. Janin ◽  
M. J. Haggerty
Keyword(s):  
Computer Simulation ◽  
Numerical Experiments ◽  
Density Fluctuations ◽  
Gravitational Systems ◽  
Interacting Systems

It has been suggested that particle positions in expanding N-body gravitational systems may become increasingly correlated. Such incoherent density fluctuations could develop into bound clusters. Similarly superclusters of such clusters may be dynamically created. We present results of explorations of this idea, using computer simulation. Accurate integrations are made of gravitationally interacting systems of a few hundred particles.

scholarly journals Stochastic Computer Simulation of Cermet Coatings Formation

2015 ◽  
Vol 2015 ◽  
pp. 1-16 ◽  
Author(s):  
Oleg P. Solonenko ◽  
Vladimir I. Jordan ◽  
Vitaly A. Blednov
Keyword(s):  
Computer Simulation ◽  
Liquid Metal ◽  
Substrate Temperature ◽  
Numerical Experiments ◽  
Lamellar Structure ◽  
Computational Algorithm ◽  
Thermal Spraying ◽  
Physical Parameters ◽  
Program Complex ◽  
Computational Technology

An approach to the modeling of the process of the formation of thermal coatings lamellar structure, including plasma coatings, at the spraying of cermet powders is proposed. The approach based on the theoretical fundamentals developed which could be used for rapid and sufficiently accurate prediction of thickness and diameter of cermet splats as well as temperature at interface “flattening quasi-liquid cermet particle-substrate” depending on the key physical parameters (KPPs): temperature, velocity and size of particle, substrate temperature, and concentration of finely dispersed solid inclusions uniformly distributed in liquid metal binder. The results are presented, which concern the development of the computational algorithm and the program complex for modeling the process of laying the splats in the coating with regard to the topology of its surface, which varies dynamically at the spraying, as well as the formation of lamellar structure and porosity of the coating. The results of numerical experiments are presented through the example of thermal spraying the cermet TiC-30 vol.% NiCr powder, illustrating the performance of the developed computational technology.

A Study about Lohmann III and Burch Encoding Method to Making CGH

2012 ◽  
Vol 263-266 ◽  
pp. 1568-1573
Author(s):  
Long Qing He ◽  
Xiu Li Bai ◽  
Ji Cheng Lin
Keyword(s):  
Computer Simulation ◽  
Fourier Transform ◽  
Matlab Software ◽  
Encoding Method ◽  
The Fourier Transform

By applying the Matlab software ,the Lohmann Ⅲ and Burch encoding method are used to achieve the Fourier transform hologram respectively. The computer simulation reconstruction of the hologram is achieved. The characteristic of the Lohmann Ⅲ and Burch encoding method are discussed.

scholarly journals Constructing a mathematical model and studying numerically the effect of bio-clogging on soil filtration consolidation

2021 ◽  
Vol 2 (10 (110)) ◽  
pp. 27-34
Author(s):  
Natalia Ivanchuk ◽  
Petro Martyniuk ◽  
Olga Michuta ◽  
Yevhenii Malanchuk ◽  
Hanna Shlikhta
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Computer Simulation ◽  
Lower Limit ◽  
Numerical Experiments ◽  
Pure Water ◽  
Soil Mass ◽  
Household Waste ◽  
Consolidation Process ◽  
Filtration Consolidation

Mathematical modeling and computer simulation methods have been used to investigate the extent of influence exerted by bio-clogging on the dynamics of excess head scattering in the soil massif. To this end, the classical equation of filtration consolidation has been modified for the case of variable porosity resulting from changes in the biomass. The numerical solution to the constructed mathematical model in the form of a nonlinear boundary problem was derived by a finite-element method. Numerical experiments were carried out and their analysis was performed. Specifically, this paper shows the charts of pressure differences in the soil array when neglecting bio-clogging and when estimating the effects exerted by bio-clogging at specific points in time. The numerical experiments demonstrated that in two years after the onset of the consolidation process in the neighborhood of the lower limit of the examined soil mass with a thickness of 10 meters, excess heads fall from the initial value of 10 m to 4 m. The greatest impact from the clogging of pores by microorganisms is revealed in the neighborhood of an upper limit. At a depth of 1 m, at t=180 days, the pressure difference reaches 2.4 m. This is about 200 % of the pressure distribution without taking into account the effects of bio-clogging. Over time, the effect of bacteria on the distribution of pressures in the neighborhood of the upper boundary decreases. However, this effect extends to the entire soil mass, up to the lower limit. Thus, at t=540 days, at the lower limit, the effect of bio-clogging leads to that excess heads are 1.8 m greater than for the case of pure water filtration (a relative increase of about 80 %). Bio-clogging processes are intensified as a result of the development of microorganisms when organic chemicals enter the porous environment. Therefore, from a practical point of view, studying them is especially relevant for household waste storage facilities and the stability of their soil bases. It is advisable to undertake research by using the methods of mathematical modeling and computer simulation

ROLE OF CELLULAR COUPLING AND DISPERSION OF REFRACTORINESS IN CARDIAC ARRHYTHMIAS: A SIMULATION STUDY

1999 ◽  
Vol 07 (04) ◽  
pp. 529-540
Author(s):  
R. G. SEIGNEURIC ◽  
J-L. CHASSÉ ◽  
P. M. AUGER ◽  
A. L. BARDOU
Keyword(s):  
Computer Simulation ◽  
Coronary Artery ◽  
Simulation Study ◽  
Cardiac Arrhythmias ◽  
Refractory Period ◽  
Numerical Experiments ◽  
Coronary Circulation ◽  
Cell Dispersion ◽  
Coupling Resistance

Computer simulation is applied to study the role of cellular coupling, dispersion of refractoriness as well as both of them, in the mechanisms underlying cardiac arrhythmias. We first assumed that local ischemia mainly induces cell to cell dispersion in the coupling resistance (case 1), refractory period (case 2) or both (case 3). Numerical experiments, based on the van Capelle and Durrer model, showed that vortices could not be induced in these conditions. In order to be more realistic about coronary circulation we simulated a patchy dispersion of cellular properties, each patch corresponding to the zone irrigated by a small coronary artery. In these conditions, a single activation wave could give rise to abnormal activities. Probabilities of reentry, estimated for the three cases cited above, showed that a severe alteration of the coupling resistance may be an important factor in the genesis of reentry. Moreover, use of isochronal maps revealed that vortices were both stable and sustained with an alteration of coupling alone or along with reductions of action potential duration. Conversely, simulations with reduction of the refractoriness alone induced only transient patterns.

scholarly journals Automated Gross Cutting in Farming Sector using Robotics and IOT

2020 ◽  
Vol 9 (5) ◽  
pp. 600-604
Keyword(s):  
Image Processing ◽  
Plant Growth ◽  
Numerical Experiments ◽  
Modern World ◽  
Cutting Mechanism ◽  
Structural Dynamic ◽  
Matlab Software ◽  
Human Interface ◽  
Functional Aspects ◽  
Arduino Uno

Robotics is the human interface machine used for fulfill the desired work where human efforts are low. In General the design of a robot involves various types of analyses that invariably include structural, dynamic, kinematic and numerical experiments. A robot designed for weeding problems would have to consider the stages of plant growth. Initially prescribed description of the framework for proposed robot is provide the simplicity along with the known parameters of design. The primary design parameter of the robot and cutting mechanism establishes certain geometric and structural constrains on the design the worm gear, worm and blades which is attached with motors for comprising the cutting mechanism of the robot. This relationship is studied in order to improve the speed of cutting the weeds by image processing of camera for the differentiation of the weeds and plants by the robot. A significant reduction in size is achieved by working on these variables which leads to the improvement in the functional aspects and reduces the innovation of bigger machine used for these weeding purposes in modern world. There are 3 motors in which 2 motors are used for movement and 1 motor is used for actuating the cutting mechanism. This whole mechanism is controlled by Arduino UNO controller and MatLAB software. Arduino UNO controls the movement of the robot and the MatLAB software controls the differentiation of the plants and the weeds depending on the task allocated to the robot.http://www.ijitee.org/wp-content/uploads/papers/v9i5/E2457039520.pdf

scholarly journals МОДЕЛЮВАННЯ ПРОЦЕСУ ШТАМПУВАННЯ ОПУКЛОГО КУТНИКА ЗГИНАННЯМ-ФОРМУВАННЯМ ПЕРЕДАВАЛЬНИМ СЕРЕДОВИЩЕМ

2021 ◽  
pp. 55-64
Author(s):  
О. М. Застела
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Variational Method ◽  
Data Reduction ◽  
Numerical Experiments ◽  
Natural Experiments ◽  
Flexible Surface ◽  
Deformed State ◽  
The Mathematical Model

Computer simulation allows you to monitor the load of material and its behavior in the course of molds, to determine the energy parameters of the process, to reflect the kinematics of the tool movement, the transmitting agent and the workpiece itself. This provides a significant reduction in time and expenses for natural experiments, in general, a significant decrease in the volumes of technological preparation of stamping works. The indicated method is most suitable for improving modern stamping production using transmitting environments. For numerical experiments in the punching region of billets from the sheet, the most acceptable variational method or ICE is the most acceptable. This approach provides minimal discrepancy between the results of natural and numerical experiments. Its is widely used in various programmates Nastran, Ansys, Katy, etc., which allows you to optimize the process of receiving data reduction in time, quickly edit to all sorts of changes on deformation conditions. During the process of shaping the convex corner there are significant changes in geometry related to corrugated formation on the collateral part of the workpiece. For this reason, the approach to the formation of a mesh sampling for the MSE calculations have the features of methods of use in the size of the breakdown elements, in particular for the transmitting medium and the leaf workpiece, the size of the elements small, and for equipping can be selected large, except the flexible surface. The construction of the mathematical model based on the ITS allows not only to determine the necessary parameters of the process, but also to consider the process of shapes in individual stages, to determine the painting of a stress-deformed state, to identify the most dangerous zones of bending-stamping, changing the thickness of the material, and trace the behavior of the material after unloading . All this makes it possible to evaluate the quality of the resulting product according to the specified parameters of the process, as well as the desired results by varying the initial parameters of the model.

Calculation Method of Attemperation Water Flow in Changing Steam Flow Condition

2012 ◽  
Vol 614-615 ◽  
pp. 282-285
Author(s):  
Qing Wang ◽  
Yuan Li
Keyword(s):  
Computer Simulation ◽  
Water Flow ◽  
Calculation Method ◽  
Water Demand ◽  
Flow Condition ◽  
Linear Process ◽  
Enthalpy Increment ◽  
Steam Flow ◽  
Matlab Software ◽  
Perform Computer Simulation

In order to control the attemperation water demand, the superheater heating ability is calculated by enthalpy increment. According to the changed enthalpy of the superheater outlet, the attemperation water demand is estimated. To simplify calculation, the changing steam flow is regarded as linear process during a certain time. Thus, the attemperation water calculation method is obtained. Basis on this, Matlab software is used to perform computer simulation to the system.

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