Capillary Scanning of a Porous Matrix. Experimental Techniques and Processing of its Results

2019 ◽  
Vol 7 (4) ◽  
pp. 29-42
Author(s):  
А. Синцов ◽  
A. Sintsov ◽  
Владимир Девисилов ◽  
Vladimir Devisilov
Keyword(s):  
Mathematical Model ◽  
Porous Structure ◽  
Structural Characteristics ◽  
Experimental Methods ◽  
Porous Matrix ◽  
Experimental Setup ◽  
Porous Structures ◽  
Porous Sample ◽  
Starting Position

The article presents an analysis of the possibilities of the previously unused method for the experimental study of porous permeable materials and the determination of their structural characteristics. The purpose of the experiment is to determine the geometric parameters of the porous matrix, which integrates the characteristics of the porous material. An example of analytical scanning of a porous structure is considered. A review of existing experimental methods is given. A scheme of the experimental setup, methods for conducting a capillary experiment and processing the data obtained are proposed. As an example, a mathematical model of the experiment is used, illustrating the possible results of the study of a porous sample. It is shown how the results of experiments are transformed into a porous matrix and are interpreted as its capillary scanning. It is proved that this model of porous structure can be used as a starting position in the mathematical calculations of the processes occurring in porous structures.

Geometrical Model for Permeable Material’s Porous Structure

2019 ◽  
Vol 7 (2) ◽  
pp. 42-54 ◽  
Author(s):  
А. Синцов ◽  
A. Sintsov ◽  
Владимир Девисилов ◽  
Vladimir Devisilov
Keyword(s):  
Porous Material ◽  
Porous Structure ◽  
Cross Section ◽  
Structural Characteristics ◽  
Variable Cross Section ◽  
Geometrical Model ◽  
Variable Cross ◽  
Experimental Stand ◽  
Experimental Technology

In this paper have been presented a new model of the porous structure, as well as an analysis of possibilities of a new method for experimental investigation of porous permeable materials and determination of their structural characteristics. An analysis for the majority of used in analytical calculations geometric models for a porous medium has been presented, and a model for a porous material in the form of porous matrix’s elementary cells has been proposed. Each of the cells contains a capillary channel with a variable cross-section. Volumetric structural characteristics, as well as dependencies of surface structural characteristics over the porous matrix’s thickness, are identical to these parameters, which have been obtained during the experimental study of a porous material. As a result of use of an original experimental technology offered by authors, and of experiment processing the porous matrix’s structure can be completely defined. The problem of creating an experimental setup, allowing determine the porous matrix’s characteristics, has been formulated. One of possible options for the experimental stand has been considered.

scholarly journals The distribution regularities of structural, physical and mechanical characteristics of the fillings of shredded wood in the bunkers at the gravity movement

2016 ◽  
Vol 6 (3) ◽  
pp. 100-108
Author(s):  
Лозовецкий ◽  
Vyacheslav Lozovetskiy ◽  
Шадрин ◽  
Anatoliy Shadrin ◽  
Лебедев ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Structural Characteristics ◽  
External Friction ◽  
Experimental Setup ◽  
Analytical Studies ◽  
Physical And Mechanical Characteristics

Described the experimental setup and presents the results of theoretical and experimental analytical studies of structural characteristics (coefficient of fully wood - porosity or the porosity) and physico-mechanical properties (coefficients of internal and external friction) of the materials crushed wood, a generalization which allowed us to obtain the calculated dependences for determination of their size by volume of bunkers axisymmetric geometry.

Hybrid Numerical-Optical Methods for Analysis of Mechanical Structures

2010 ◽  
Vol 97-101 ◽  
pp. 4297-4300
Author(s):  
Cheng Zhi Wang ◽  
Małgorzata Kujawińska ◽  
Grzegorz Dymny ◽  
Robert Sitnik
Keyword(s):  
Mathematical Model ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Hybrid Method ◽  
Numerical Solutions ◽  
Experimental Methods ◽  
Optical Methods ◽  
Optical Metrology ◽  
Experimental Setup

In conventional approach numerical and experimental solutions are independent and lack of interaction. Because each method has its own drawback, an interactive combination of numerical and experimental methods is proposed. An application of the hybrid method with Finite Element Method and optical metrology is illustrated, which demonstrates the viability of the feedback of experimental to numerical model, or numerical solutions to experimental setup and then improvement and adjustment of mathematical model and experimental setup.

scholarly journals DETERMINATION AND STUDY OF THE VOLUME AND DENSITY OF COMPLEX POROUS SAMPLES

2021 ◽  
Vol 73 (1) ◽  
pp. 110-113
Author(s):  
M.K. Kulbek ◽  
◽  
E. Dzhaksigeldinova ◽  
Keyword(s):  
Porous Materials ◽  
Experimental Method ◽  
Experimental Work ◽  
Complex Shape ◽  
Experimental Methods ◽  
Porous Sample ◽  
New Methods ◽  
Technical Properties ◽  
Comprehensive Study

Various porous materials are widely used in various industries, such as chemical, metallurgical, energy, light, food, etc. Therefore, a comprehensive study of their structure and physical and technical properties is of great scientific and technological importance. The article presents the results of determining and studying the volume and density of porous sample materials using a new experimental method. The determination of the volume and density of waterproof samples of any complex shape can be easily determined on the basis of Archimedes ' law. However, it is impossible to determine the volume and density of porous water-absorbing samples of complex shape directly using this law. The article presents new experimental methods (methods) for determining the volume and density of such porous samples of complex shape. The results of experimental work carried out using the proposed new methods are presented and analyzed.

Modified factor analysis of the circular dichroism spectra, applied to a series of cyclodipeptides containing L-proline

1979 ◽  
Vol 44 (4) ◽  
pp. 1296-1311 ◽  
Author(s):  
Petr Pančoška ◽  
Ivo Frič ◽  
Karel Bláha
Keyword(s):  
Mathematical Model ◽  
Factor Analysis ◽  
Hilbert Spaces ◽  
Principal Components ◽  
Structural Characteristics ◽  
Cd Spectra ◽  
Modified Method ◽  
Minimum Number ◽  
Related Compounds

A mathematical model has been developed which uses the theory of Hilbert spaces and the modified method of the principal components of the factor analysis to the determination of the minimum number of subspectra sufficient to describe a set of experimental CD curves of a series of structurally related compounds. The use of this method has been demonstrated on the CD spectra of nine cyclodipeptides containing (besides L-proline) glycine, L or D alanine, L or D valine, L or D leucine, and L or D tert-leucine, measured in acetonitrile and 2,2,2-trifluoroethanol. Relation is discussed between the calculated subspectra and the structural characteristics of the measured systems.

scholarly journals Determination of the structural and chemisorption characteristics of granulated active charcoal on the basis of coconut shell

2004 ◽  
Vol 58 (9) ◽  
pp. 416-422
Author(s):  
Dragan Milenkovic ◽  
Stanisa Stoiljkovic ◽  
D.R. Ilic
Keyword(s):  
Mathematical Model ◽  
Aqueous Solution ◽  
Structural Characteristics ◽  
Active Charcoal ◽  
Wastewater Purification ◽  
Industrial Plants ◽  
Coconut Shells ◽  
Kinetics Of ◽  
Regression Correlation

Wastewater purification and the acquirement of drinking water from water streams that are in most cases recipients of various industrial plants, present a significant problem nowadays. The structural characteristics of granulated active charcoal (GAC) obtained by the carbonization of coconut shells and activated by steam are presented in this paper. The established kinetics of suspending cyanide from aqueous solution using GAC impregnated with copper(II) acetate were studied and a mathematical model estabkusged by a regression - correlation analysis.

DETERMINATION OF PERFORMANCE INDICATORS OF THE TRUCK KrAZ-6510TE

2020 ◽  
pp. 19-26
Author(s):  
Olexandr Pavlenko ◽  
Serhii Dun ◽  
Maksym Skliar
Keyword(s):  
Mathematical Model ◽  
Surface Friction ◽  
Building Structures ◽  
Maximum Torque ◽  
Military Equipment ◽  
Military Vehicles ◽  
Force Magnitude ◽  
Vehicle Mobility ◽  
The Mathematical Model

In any economy there is a need for the bulky goods transportation which cannot be divided into smaller parts. Such cargoes include building structures, elements of industrial equipment, tracked or wheeled construction and agricultural machinery, heavy armored military vehicles. In any case, tractor-semitrailer should provide fast delivery of goods with minimal fuel consumption. In order to guarantee the goods delivery, tractor-semitrailers must be able to overcome the existing roads broken grade and be capable to tow a semi-trailer in off-road conditions. These properties are especially important for military equipment transportation. The important factor that determines a tractor-semitrailer mobility is its gradeability. The purpose of this work is to improve a tractor-semitrailer mobility with tractor units manufactured at PJSC “AutoKrAZ” by increasing the tractor-semitrailer gradeability. The customer requirements for a new tractor are determined by the maximizing the grade to 18°. The analysis of the characteristics of modern tractor-semitrailers for heavy haulage has shown that the highest rate of this grade is 16.7°. The factors determining the limiting gradeability value were analyzed, based on the tractor-semitrailer with a KrAZ-6510TE tractor and a semi-trailer with a full weight of 80 t. It has been developed a mathematical model to investigate the tractor and semi-trailer axles vertical reactions distribution on the tractor-semitrailer friction performances. The mathematical model has allowed to calculate the gradeability value that the tractor-semitrailer can overcome in case of wheels and road surface friction value and the tractive force magnitude from the engine. The mathematical model adequacy was confirmed by comparing the calculations results with the data of factory tests. The analysis showed that on a dry road the KrAZ-6510TE tractor with a 80 t gross weight semitrailer is capable to climb a gradient of 14,35 ° with its coupling mass full use condition. The engine's maximum torque allows the tractor-semitrailer to overcome a gradient of 10.45° It has been determined the ways to improve the design of the KrAZ-6510TE tractor to increase its gradeability. Keywords: tractor, tractor-semitrailer vehicle mobility, tractor-semitrailer vehicle gradeability.

Modelling and Simulation of NO2 Dispersion Phenomenon in Atmosphere by Analytical-Experimental Methods

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Delia Perju ◽  
Harieta Pirlea ◽  
Gabriela-Alina Brusturean ◽  
Dana Silaghi-Perju ◽  
Sorin Marinescu
Keyword(s):  
Mathematical Model ◽  
Nitrogen Dioxide ◽  
Modeling And Simulation ◽  
Human Health ◽  
Experimental Methods ◽  
Negative Effects ◽  
Real Situation ◽  
Experimental Values ◽  
The Mathematical Model

The European laws and recently the Romanian ones impose more and more strict norms to the large nitrogen dioxide polluters. They are obligated to continuously improve the installations and products so that they limit and reduce the nitrogen dioxide pollution, because it has negative effects on the human health and environment. In this paper are presented these researches made within a case study for the Timi�oara municipality, regarding the modeling and simulation of the nitrogen dioxide dispersion phenomenon coming from various sources in atmosphere with the help of analytical-experimental methods. The mathematical model resulting from these researches is accurately enough to describe the real situation. This was confirmed by comparing the results obtained based on the model with real experimental values.

Research on a Generating Method of Spiral Flutes of Hourglass Worm Gear Hob

2017 ◽  
Author(s):  
Yang Jie ◽  
Li Haitao ◽  
Rui Chengjie ◽  
Wei Wenjun ◽  
Dong Xuezhu
Keyword(s):  
Mathematical Model ◽  
Manufacturing System ◽  
Worm Gear ◽  
Virtual Manufacturing ◽  
Transmission Ratio ◽  
Method Of Determination ◽  
Generating Method ◽  
Multiple Threads ◽  
Different Shapes

All of the cutting edges on an hourglass worm gear hob have different shapes and spiral angles. If the spiral angles are small, straight flutes are usually adopted. But for the hob with multiple threads, the absolute values of the negative rake angles at one side of the cutting teeth will greatly affect the cutting performance of the hob if straight flutes are still used. Therefore, spiral flutes are usually adopted to solve the problem. However, no method of determination of the spiral flute of the hourglass worm gear hob has been put forward till now. Based on the curved surface generating theory and the hourglass worm forming principle, a generating method for the spiral flute of the planar double enveloping worm gear hob is put forward in this paper. A mathematical model is built to generate the spiral flute. The rake angles of all cutting teeth of the hob are calculated. The laws of the rake angles of the cutting teeth of four hobs with different threads from one to four threads are analyzed when straight flutes and spiral flutes are adopted respectively. The laws between the value of the negative rake angles of the hob with four threads and the milling transmission ratio are studied. The most appropriate milling transmission ratio for generating the spiral flute is obtained. The machining of the spiral flutes is simulated by a virtual manufacturing system and the results verify the correctness of the method.

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