Experimental and Computer Researches of Ferroconcrete Beams at High-Temperature Influences

2019 ◽  
Vol 968 ◽  
pp. 355-360 ◽  
Author(s):  
Yuriy Otrosh ◽  
Mykola Surianinov ◽  
Alexander Golodnov ◽  
Olena Starova
Keyword(s):  
Computer Simulation ◽  
High Temperature ◽  
Numerical Analysis ◽  
Experimental Research ◽  
Experimental Studies ◽  
Research Data ◽  
Fire Tests ◽  
Practical Application ◽  
Software Complex

The paper presents experimental and computer researches of ferroconcrete beams at high-temperature influences. There were conducted the experimental fire tests of ferroconcrete beams. The most promising way of verifying these experimental research data is computer simulation of structures, also during a fire. In order to evaluate the quality of the experiment and the reliability of the received temperature distribution, there was conducted a computer simulation of the ferroconcrete beam in the ANSYS R.17.1 software complex. There were conducted a comparative analysis of the results of experimental studies and numerical analysis. The results confirm that the method of conducted experimental research and computer simulation with further numerical analysis can be recommended for practical application.

Method of numerical estimating aerial images indicators quality for mapping purposes

2021 ◽  
Vol 968 (2) ◽  
pp. 29-37
Author(s):  
I.A. Anikeeva
Keyword(s):  
Random Noise ◽  
Experimental Studies ◽  
Aerial Images ◽  
Practical Application ◽  
Correct Color ◽  
Numerical Assessment ◽  
Airborne Imaging ◽  
Imaging Sensors ◽  
Color Rendering

The task of assessing the quality of aerial imagery, obtained for mapping, in terms of vision properties, is very ambiguous due to the lack of objective criteria and evaluation methods. A system of indicators for aerial images quality and methods of their numerical assessment is presented. The fine aerial image’s quality is characterized by a set of its structural and gradation properties. The structural properties of the image are determined by the actual spatial resolution and photographic sharpness. Gradation properties of an image are characterized by the correct color rendering, the level of random noise and information completeness indicators – haze, radiometric resolution and the percentage of information loss in illumination and shadows.Methods of evaluating these indicators are formulated, and their recommended and acceptable numerical values are determined analytically. To clarify and correct the obtained analytical recommended and acceptable numerical values of the image quality indicators of their practical application possibility and further experimental studies are necessary with materials, obtained through various airborne imaging sensors for mapping.

scholarly journals Computer Simulation of Complex Electronic Systems of Navigation Systems

2020 ◽  
Vol 35 ◽  
pp. 04021
Author(s):  
Victor V. Shcherbinin ◽  
Ravil R. Zagidullin ◽  
Georgy A. Kvetkin ◽  
Marina S. Sidorova
Keyword(s):  
Computer Simulation ◽  
Navigation System ◽  
Electronic Equipment ◽  
Electronic Systems ◽  
Navigation Systems ◽  
Software Complex ◽  
Radio Electronic ◽  
Local Navigation ◽  
Using Data

The paper proposes ways to reduce the time and improve the quality of development of electronic equipment using computer simulation. The paper considers an example of the development and debugging of a radio-electronic module, which has found its direct application in a local navigation system that operates on the basis of the method of point landmarks. The paper considers a hardware-software complex for the implementation of the study of the health of both individual functional units and radio rangefinder equipment as a whole, as well as for the modernization of the radio-electronic module of the navigation system. The various computer simulation environments available today allow the development and design of electronic equipment at various levels. In the proposed work, computer simulation was carried out in MATLAB / Simulink, LabVIEW, Multisim and MicroCap. The work also provided for the possibility of using data collection and processing modules, which provides the opportunity in one software development and modeling environment to compare the results obtained using simulation modeling and physical research of the object. The result of the work is a hardwaresoftware kit of the radio-electronic module of the navigation system through which it is possible to evaluate the influence of various external influences on the accuracy of determining the range from the interrogator (moving object) to the transponder (stationary beacon).

scholarly journals Metallic alloy with shape memory – selected properties and engineering aspects

2019 ◽  
Author(s):  
Krzysztof Kuś ◽  
Adam Frączyk ◽  
Adam Wojtkowiak
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Shape Memory ◽  
Experimental Studies ◽  
Point Of View ◽  
Ti Alloy ◽  
Practical Application ◽  
Technical Aspects ◽  
Technical Point ◽  
The Veil

In the case of shape memory alloys (SMA), a form to which a material is expected to return during its heating can be repeatedly programmed, whereas other related properties also individually adjusted. It was noticed that most producers of commercial assortment based on SMA or traders seldom are willing to lift the veil of secrecy on this topic. In the context of own experimental studies, the authors made reference to technical aspects of some post-treatments of a Ni-Ti alloy with a view to further practical application, e.g. design and construction of machinery and structures with the involvement of SMA. For these purposes, attempts concerning the high-temperature shape setting were carried out using various parameters of heat treatment with no secrecy surrounding the procedures applied. Some of the tested parameters proved effective, whereas some were less useful. Following the activation of the reverse transformation by heating, a somewhat different behaviour was observed, and simultaneously one of the crucial material temperatures was determined. The paper as a whole is reported from a specifically engineering/technical point of view, which is continuously emphasized in the content of the presented article.

Experimental estimation of the temperature regime of the model reservoir with a protective wall type "glass in glass" under fire conditions

2020 ◽  
Vol 90 ◽  
pp. 32-48
Author(s):  
D. N. Rubtsov ◽  
◽  
A. N. Egorov ◽  
Keyword(s):  
Temperature Measurement ◽  
Experimental Research ◽  
Thermal State ◽  
Experimental Studies ◽  
Heating Time ◽  
The Body ◽  
Steel Shell ◽  
Contact Method ◽  
Fire Tests ◽  
Wall Model

Introduction. The publication contains a description and results of a series of fire tests of a model of a "glass in a glass" oil product tank, obtained inter alia using the method of contact temperature measurement. The paper presents the formulation of the problem of experimental research, the conditions and methods for their implementation, a description of the instrumental base and the results obtained. The aims and goals. An experimental study is carried out to assess the effect of heat loads of a fire on the body of the protective wall in the event of a fire in the main tank as well as for further use of the obtained empirical dependences of the temperature of the body of the protective wall on the heating time for carrying out the verification procedure of the mathematical model for its adequacy to the investigated physical process. Methodology. Experimental research method, contact method of temperature measurement, observation, analysis, generalization. The results of the study. The paper presents the results of experimental studies on the basis of which empirical dependences were obtained for calculating the change in the temperature values of the protective wall model depending on the time of its heating. Fire tests made it possible to establish the general thermal state of the "main reservoir with oil product – protective wall" system. The contribution of the influence of different speeds of wind flows on the heating of the protective wall of the reservoir is determined. Conclusion. The data obtained in the experiments will be used for the numerical assessment of the stress-strain state of the steel shell of the tank protective wall in case of fire in the main tank, which is necessary for the design of fire-fighting systems for water sprinkling and foam fire extinguishing on the protective wall of the tank of the "glass in glass" type. Key words: protective wall, model, oil product, fire tests, fire, tank, stand, thermocouple, experiment.

Inside the Arbitrator's Mind

2018 ◽  
Author(s):  
Susan D. Franck ◽  
Anne van Aaken ◽  
James Freda ◽  
Chris Guthrie ◽  
Jeffrey J. Rachlinski
Keyword(s):  
Decision Making ◽  
Dispute Resolution ◽  
Decision Maker ◽  
Experimental Research ◽  
Experimental Studies ◽  
Black Box ◽  
Judgment And Decision Making ◽  
Conventional Wisdom ◽  
Quality Decision

66 Emory Law Journal 1115 (2017)Arbitrators are lead actors in global dispute resolution. They are to global dispute resolution what judges are to domestic dispute resolution. Despite its global significance, arbitral decision making is a black box. This Article is the first to use original experimental research to explore how international arbitrators decide cases. We find that arbitrators often make intuitive and impressionistic decisions, rather than fully deliberative decisions. We also find evidence that casts doubt on the conventional wisdom that arbitrators render “split the baby” decisions. Although direct comparisons are difficult, we find that arbitrators generally perform at least as well as, but never demonstrably worse than, national judges analyzed in earlier research. There may be reasons to prefer judges to international arbitrators, but the quality of judgment and decision making, at least as measured in these experimental studies, is not one of them. Thus, normative debates about global dispute resolution should focus on using structural safeguards and legal protections to enhance quality decision-making, regardless of decision maker identity or title.

scholarly journals VERIFICATION RESULTS OF THE PRESENTATION OF THE PROTECTION OF THE UNSTEADING TEMPERATURE FIELD AT THE CONCRETE CONSTRUCTION FOR THE MIND OF THESTANDARD TEMPERATURE REFRIGERATION FIRE

2018 ◽  
pp. 96-101 ◽  
Author(s):  
O. Pazen
Keyword(s):  
Temperature Field ◽  
Experimental Research ◽  
Fire Resistance ◽  
Concrete Structure ◽  
Experimental Studies ◽  
Alternative Methods ◽  
Building Structures ◽  
Fire Tests ◽  
Stationary Temperature Field ◽  
The Phoenix

The main classification indicator, in terms of fire safety, is the degree of fire resistance of the house. Depending on this indicator normalize its surface, the area of development and distance to other buildings and structures. The degree of fire resistance of the house is determined by the limit of fire resistance of its building structures and the limit of the fire spread by these structures. Therefore, the value of the fire resistance limit of building constructions, which consists of a house, significantly affect its architectural solution and the parameters of construction in general. On this basis, taking into account the approaches to ensuring normalized fire resistance limits of the design and the features of their behavior under high-temperature (fire) influence is very relevant. Most research on building constructions is based on two methods of determining the limit of fire resistance - experimental and analytical. The first one is to determine the limit of fire resistance on the basis of experimental research, and the second one is based on methods of analytical or computational and experimental research. In most countries, the experimental determination of fire resistance of building structures is carried out by means of fire tests. However, experimental studies require significant financial costs and high accuracy of fire tests. The alternative methods for assessing the fire resistance of building elements on the basis of field fire tests are the design methods used for the design of fire-resistant building constructions. In the article, the verification of the results of analytical studies on the propagation of the non-stationary temperature field in the concrete structure under the conditions of the influence of the standard temperature regime of the fire in comparison with the results of field fire tests has been carried out. The analysis of the obtained results shows that the results of the calculation of the distribution of the non-stationary temperature field in the thickness of the concrete structure without coating and with the applied flame retardant coating of the Phoenix STV, manufactured by the company "A + B Ukraine" on the front of the Phoenix Contact, obtained using mathematical models, are qualitatively and quantitatively convergent with results obtained experimentally. The difference between the theoretical and experimental data for a concrete structure without coating is 4%, and with the applied fire-retardant coating does not exceed 10%.

scholarly journals Numerical–Experimental Analysis of Polyethylene Pipe Deformation at Different Load Values

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 160
Author(s):  
Adam Gnatowski ◽  
Agnieszka Kijo-Kleczkowska ◽  
Mateusz Chyra ◽  
Dariusz Kwiatkowski
Keyword(s):  
Computer Simulation ◽  
Numerical Analysis ◽  
Experimental Analysis ◽  
External Load ◽  
Experimental Studies ◽  
Strain Gauges ◽  
Experimental Investigations ◽  
Polyethylene Pipe ◽  
External Forces ◽  
The Impact

Polymer pipes are used in the construction of underground gas, water, and sewage networks. During exploitation, various external forces work on the pipeline, which cause its deformation. In the paper, numerical analysis and experimental investigations of polyethylene pipe deformation at different external load values (500, 1000, 1500, and 2000 N) were performed. The authors measured strains of the lower and upper surface of the pipe during its loading moment using resistance strain gauges, which were located on the pipe at equal intervals. The results obtained from computer simulation and experimental studies were comparable. An innovative element of the research presented in the article is recognition of the impact of the proposed values of the load of polyethylene pipe on the change in its deformation.

scholarly journals Numerical analysis and experimental research of the rubber boot of the joint drive vehicle

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jan Ziobro
Keyword(s):  
Numerical Analysis ◽  
Experimental Research ◽  
Experimental Studies ◽  
Contact Condition ◽  
Vehicle Performance ◽  
Performance Requirements ◽  
Numerical Studies ◽  
Comparison Of The Results ◽  
The Mathematical Model ◽  
Two Parameter

Abstract The article presents many numerical studies and experimental research of the drive rubber boot of the joint drive vehicle. Performance requirements have been discussed and the required coefficients of the mathematical model for numerical simulation have been determined. The behavior of living in MSC.MARC environment was examined. In the analysis the following have been used: hyperplastic two-parameter model of the Mooney-Rivlin material, large displacements procedure, safe contact condition, friction on the sides of the boots. 3D numerical model of the joint bootwas analyzed under influence of the forces: tensile, compressive, centrifugal and angular. Numerous results of studies have been presented. An appropriate test stand was built and comparison of the results of the numerical analysis and the results of experimental studies was made. Numerous requests and recommendations for utilitarian character have been presented.

scholarly journals STUDY OF THE EFFICIENCY OF SQUEEZING MOISTURE-SATURATED PRODUCTS

2021 ◽  
pp. 86-96
Author(s):  
Gayrat Bahadirov ◽  
Gerasim Tsoy ◽  
Ayder Nabiev
Keyword(s):  
Experimental Study ◽  
Energy Consumption ◽  
Technological Process ◽  
Experimental Research ◽  
Practical Importance ◽  
Experimental Studies ◽  
Leather Industry ◽  
Mathematical Planning ◽  
Roller Machine

The leather industry includes many technological machines; a squeezing roller machine is used in many operations, for example, in squeezing, degreasing, and after drum dyeing of a semi-finished leather product. The paper presents the results of experimental studies obtained by determining the influence of multilayer wet leather semi-finished products with monshons under squeezing on the amount of the moisture extracted. Mathematical dependences of the amount of the moisture extracted, for each layer of a five-layer wet leather semi-finished product on the feed rate between the squeeze rollers and the roller pressure were obtained. Experimental research is of scientific and practical importance for the development of a technological process for extracting moisture from wet leather semi-finished products used in the tannery, since the quality of the extraction affects the quality of subsequent technological operations, such as leather shaping and splitting. An experimental study was performed using the method of mathematical statistics, namely, the method of mathematical planning of the experiment. Mathematical models were obtained for the amount of extracted moisture from five wet leather semi-finished products depending on the rate of their simultaneous feed and the pressure of the squeezing rollers. The results of the experiment showed that in squeezing a five-layer product, the productivity of the technological process of extracting moisture from wet leather semi-finished products increases by five times in comparison with existing squeezing roller machines. The use of the results of the experimental study will contribute to a significant reduction in the energy consumption of the squeezing roller machine by simultaneous multi-layer processing of wet leather semi-finished products

scholarly journals Effect of reaction sintering modes on the structure and properties of carbide ceramics

2019 ◽  
Vol 63 (4) ◽  
pp. 407-415
Author(s):  
E. V. Zvonarev ◽  
A. Ph. Ilyushchanka ◽  
Zh. A. Vitko ◽  
V. A. Osipov ◽  
D. V. Babura
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Boron Carbide ◽  
Experimental Studies ◽  
Main Task ◽  
Reaction Sintering ◽  
Silicon Melt ◽  
Carbide Particles ◽  
Compacting Pressure

Experimental studies of the structure, phase composition, physical and mechanical properties of the reaction-sintered ceramics based on silicon carbide and boron obtained by reaction sintering have been performed. It has been shown that the properties of the reaction-sintered ceramics based on carbides are largely determined by the quality of impregnation of the porous carbide frame with silicon, which depends on the total and open porosity, shape and size of the pores of the compact, the composition of the charge from the carbide powder. High-temperature sintering, followed by impregnation of the carbide frame with silicon and its interaction with the carbon constituent of the frame, largely determines the properties of the material. The main task in the implementation of this process is to create conditions that ensure the full filling of pores in the initial compact during impregnation with silicon melt and, secondly, maximum activation of chemical interaction between the melt of silicon, carbon and other components that compose the charge. A complex of studies on the effect of compacting pressure and annealing temperature of the charge based on silicon carbide and boron powders with the addition of graphite on the pore structure of the compact and the quality of its impregnation with a silicon melt has been carried out in this work. It has been shown that the density, bending strength, hardness of ceramics based on silicon carbide and boron carbide obtained by reaction sintering are increased with a rise in compacting pressure of carbide frames. The optimum porosity of the carbide frame is 25–30 %; the pore size is 1.0–1.5 μm. It has been also demonstrated that ceramics based on boron carbide and boron carbide with 50 % silicon carbide impregnated with silicon at high-temperature sintering has higher strength and hardness values than those based on silicon carbide due to higher adhesion strength at the interface of boron carbide particles and binder, caused by the dissolution of boron carbide in the silicon melt and the formation of complex carbide particles on the surface.

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