scholarly journals The study of dynamical processes in problems of mesofracture layers exploration seismology by methods of mathematical and physical simulation

2021 ◽  
Vol 13 (1) ◽  
pp. 71-78
Author(s):  
Maxim V. Muratov ◽  
◽  
Polina V. Stognii ◽  
Igor B. Petrov ◽  
Alexey A. Anisimov ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Physical Modeling ◽  
Physical Simulation ◽  
Multiple Reflections ◽  
Hybrid Schemes ◽  
Diffracted Waves ◽  
Fracture Models ◽  
Exploration Seismology ◽  
Computational Resources ◽  
Propagation Of Elastic Waves

The article is devoted to the study of the propagation of elastic waves in a fractured seismic medium by methods of mathematical modeling. The results obtained during it are compared with the results of physical modeling on similar models. For mathematical modeling, the grid-characteristic method with hybrid schemes of 1-3 orders with approximation on structural rectangular grids is used. The ability to specify inhomogeneities (fractures) of various complex shapes and spatial orientations has been implemented. The description of the developed mathematical models of fractures, which can be used for the numerical solution of exploration seismology problems, is given. The developed models are based on the concept of an infinitely thin fracture, the size of the opening of which does not affect the wave processes in the fracture area. In this model, fractures are represented by boundaries and contact boundaries with different conditions on their surfaces. This approach significantly reduces the need for computational resources by eliminating the need to define a mesh inside the fracture. On the other hand, it allows you to specify in detail the shape of fractures in the integration domain, therefore, using the considered approach, one can observe qualitatively new effects, such as the formation of diffracted waves and a multiphase wavefront due to multiple reflections between the surfaces, which are inaccessible for observation when using effective fracture models actively used in computational seismic. The obtained results of mathematical modeling were verified by physical modeling methods, and a good agreement was obtained.

scholarly journals Large-Scale Physical Modeling Synthesis, Parallel Computing, and Musical Experimentation: The NESS Project in Practice

2020 ◽  
Vol 43 (2-3) ◽  
pp. 31-47 ◽  
Author(s):  
Stefan Bilbao ◽  
James Perry ◽  
Paul Graham ◽  
Alan Gray ◽  
Kostas Kavoussanakis ◽  
...  
Keyword(s):  
Physical Modeling ◽  
Large Scale ◽  
Algorithm Design ◽  
Musical Instruments ◽  
Synthesis System ◽  
Professional Musicians ◽  
Musical Acoustics ◽  
Modeling Systems ◽  
Computational Resources ◽  
Theoretical Developments

Sound synthesis using physical modeling, emulating systems of a complexity approaching and even exceeding that of real-world acoustic musical instruments, is becoming possible, thanks to recent theoretical developments in musical acoustics and algorithm design. Severe practical difficulties remain, both at the level of the raw computational resources required, and at the level of user control. An approach to the first difficulty is through the use of large-scale parallelization, and results for a variety of physical modeling systems are presented here. Any progress with regard to the second difficulty requires, necessarily, the experience and advice of professional musicians. A basic interface to a parallelized large-scale physical modeling synthesis system is presented here, accompanied by first-hand descriptions of the working methods of five composers, each of whom generated complete multichannel pieces using the system.

scholarly journals The study of the process of physic-chemical destruction of coal by the method of physical modeling

2019 ◽  
Vol 109 ◽  
pp. 00054
Author(s):  
Serhii Makeiev ◽  
Serhii Andreiev ◽  
Hennadii Ryzhov
Keyword(s):  
Particle Size ◽  
Hydrochloric Acid ◽  
Surface Energy ◽  
Physical Modeling ◽  
Laboratory Experiments ◽  
Physical Simulation ◽  
Treated Area ◽  
Chemical Destruction ◽  
Clay Rocks ◽  
Physical And Chemical

One of the possible ways of physic-chemical destruction (PCD) of coal was considered. It is established that condition of the realization of a principle possibility of spontaneous dispersion of coal is to reduce its surface energy by 40-60 J/m2. Laboratory experiments to study the PCD of coal in different liquids were conducted. According to the results, kinetic curves of swelling coal in them transition D-G stamps is presents. It was established that the most intensive physical and chemical destruction of the coal to a particle size from tenths to tens of millimeters occurs in solutions of methylamine and hydrochloric acid. The most severe swelling of the coal was noted in those environment as well. The intensity of swelling is not significantly associated with the characteristics of wetting. The influence of various effects on the PCD parameters of coal was studied by physical simulation. The total time the chemical destruction of coal on the treated area was calculated. It was proposed method PCD for coals occurring in the clay rocks of various stages of catagenesis.

scholarly journals INSTALLATION FOR PHYSICAL SIMULATION OF LASER LOCATION PROCESSES

2021 ◽  
Vol 18 (1) ◽  
pp. 35-52
Author(s):  
V. I. Santoniy ◽  
Ya. I. Lepikh ◽  
V. V. Yanko ◽  
L. M. Budiyanskaya ◽  
I. A. Ivanchenko ◽  
...  
Keyword(s):  
Physical Modeling ◽  
Physical Simulation ◽  
Measuring System ◽  
Laser Ranging ◽  
Background Illumination ◽  
Destabilizing Factors ◽  
Information Measuring System ◽  
Atmospheric Channel ◽  
Detection And Recognition ◽  
Artificial Origin

A device for physical modeling of laser ranging processes has been developed, taking into account aerosol interference phenomena of natural and artificial origin and active background illumination. The installation simulates the processes of object detection and recognition by a laser information-measuring system (LIMS) under conditions of external destabilizing factors and obstacles in the atmospheric channel.

scholarly journals MODELING OF CONTROL OF SPEED CONTROL DRIVE AND SLEW MECHANISM DRIVE OF HIGH-SPEED CATERPILLAR VEHICLE WITH BORDER GEARBOX

2020 ◽  
Vol 2020 (12) ◽  
pp. 57-65
Author(s):  
Sergey Horoshilov ◽  
Sergey Kondakov ◽  
Ol'ga Pavlovskaya
Keyword(s):  
Mathematical Modeling ◽  
Physical Modeling ◽  
High Speed ◽  
Experimental Investigations ◽  
Current Trends ◽  
Reliable Model ◽  
Vehicle Acceleration ◽  
Caterpillar Vehicles ◽  
Optimum Solution ◽  
Numerous Parameter

The relevance of the topic of investigation is connected with the current trends in gearbox automation and request to lighten slew control of caterpillar vehicles. The purpose set can’t be achieved only in a physical modeling of a drive: the problem is too multiversion and a physical modeling does not guarantee an optimum solution. The scientific novelty of the investigation consists in the authors’ creation of simulator of gearbox drive and slew mechanism drive consisting of an electromotor, a planetary reducer, a crank mechanism, a hydraulic distributor and hydro-cylinder. As a consequence, there is realized a parametric investigation possibility of drive numerous parameter impact upon its performance characteristics. By means of the mathematical modeling the drive parameters ensuring the fulfillment of the requirements specification are substantiated. In the second part of the paper there are shown modeling results of caterpillar vehicle acceleration in a low and the fourth gears and a slew at a speed of 5 m/sec. The result comparison of mathematical modeling and experimental investigations is carried out. The data of experiments, in which took part the authors of the paper, confirm completely the adequacy of the simulator developed. In such a way, the simulator of caterpillar vehicle motion is supplemented with the reliable model of a gearbox drive and a slew mechanism drive in machinery with the border gearboxes. The paper material is used in the design of a similar drive of a new machine.

SYNTHETIC SEISMOGRAMS OF P WAVES PROPAGATING IN SOLID WEDGES WITH FREE BOUNDARIES

Geophysics ◽  
1966 ◽  
Vol 31 (3) ◽  
pp. 524-535 ◽  
Author(s):  
Karl Fuchs
Keyword(s):  
Transition Zone ◽  
Body Wave ◽  
Body Waves ◽  
Interference Signal ◽  
Free Boundaries ◽  
Multiple Reflections ◽  
P Waves ◽  
Model Studies ◽  
Diffracted Waves ◽  
The Time Domain

A numerical method for the synthesis of seismograms for body wave propagation in solid wedges is presented. The method is based on the superposition of multiple reflections arising from the entrance of a plane primary wave. Therefore the method is restricted to that part of the time domain where no diffracted waves from the wedge axis occur. In spite of this restriction, dispersion of body waves in wedges can well be studied by this method. Seismograms have been synthesized which show the dispersion of a primary p‐signal propagating in a solid 10‐degree and a 5‐degree wedge with free boundaries. For wedge angles less than 10 degrees the signal front (to be distinguished from the wavefront) suddenly decreases its velocity from that in the infinite medium to about that of the plate wave as the signal approaches the wedge axis. Simultaneously in this transition zone a decrease of the dominant period of the interference signal occurs. These observations are concordant with previous model studies. Particle motion diagrams disclose elliptical polarization of the interference signal in the neighborhood of the wedge axis; the polarization changes its sense from prograde to retrograde on passing through the transition zone.

scholarly journals Physical simulation of integrated protective structures

2018 ◽  
Vol 60 ◽  
pp. 00038 ◽  
Author(s):  
Serhii Nehrii ◽  
Tetiana Nehrii ◽  
Hanna Piskurska
Keyword(s):  
Physical Modeling ◽  
Physical Simulation ◽  
Impact Factors ◽  
Protective Structure ◽  
Wall Width ◽  
Rock Wall ◽  
Wall Structures ◽  
The Stability ◽  
Protective Structures ◽  
Integrated Structures

An effective way of protecting development workings by integrated rock wall structures is considered. The necessity of improving this method and its experimental verification is substantiated. Integrated rock wall structures are experimentally tested under laboratory conditions. On the basis of the results of physical modeling, parameters of integrated structures have been specified in terms of impact factors; their yield strength is also specified. The condition for ensuring the stability of the integrated protective structure, which allows calculating appropriate rock wall width, is determined.

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