scholarly journals FREE AND FORCED VIBRATIONS OF SHELLS OF VARIOUS SHAPES, TAKING INTO ACCOUNT THE VARIABILITY OF THE NON-LINEAR ELASTIC MATERIAL

2020 ◽  
Vol 3 (1) ◽  
pp. 70-75
Author(s):  
I. Sadygov
Keyword(s):  
Elastic Material ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Forced Vibrations ◽  
Relative Deformation ◽  
Dimensionless Frequency ◽  
Building Structures ◽  
Space Technology ◽  
Free And Forced Vibrations ◽  
Nonlinear Elastic

the article considers issues of shell vibrations, which are widely used in various industries and construction. Shells serve as elements of building structures with large spans. The chapter “Introduction” discussed issues related to the use of shells in all areas of industry, in aviation, rocket and space technology, railway transport, in the oil and gas industry and provides examples of shells for use in ceilings of circuses, stations, hangars; in industry: shells of rotation used as tanks, containers, columns, reactors, etc. In the section “Materials and research methods” free and forced vibrations of shells of variable thickness made out of nonlinear elastic material reviewed. In shell calculations the Kirchhoff – Law hypothesis was used. It was found that, during vibrations, the shells experience relative deformation of elongation and shear of the surface with coordinates (x, y), as well as bending and torsion strains. It is established that vibrations in the shells lead to a rotation of the main directions of elasticity and regarding to the adopted coordinate axis to angle θ, and the elastic constants of the material depend on the elastic constant Biy – the main directions of the nonlinear elastic shells. When solving the system of equations of motion of the shell relative to the displacements arising in it during vibration, based on theory R and various methods. The values of the dimensionless frequency parameter for a spherical shell taking into account changes in its curvature, variability and thickness of elastic properties are obtained.

scholarly journals Thermal insulation: operational properties and methods of research

2018 ◽  
Vol 251 ◽  
pp. 01016 ◽  
Author(s):  
Alexey Zhukov ◽  
Tatiana Konoval’tseva ◽  
Ekaterina Bobrova ◽  
Ekaterina Zinovieva ◽  
Kazbek Ivanov
Keyword(s):  
Thermal Insulation ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Mineral Wool ◽  
Building Structures ◽  
Test Results ◽  
Gas Industry ◽  
Good Convergence ◽  
Testing Facility ◽  
Main Components

Construction system consists of materials with different properties. The use of materials in the design should ensure maximum of its performance and its durability. The use of thermal insulation materials is an effective way to form the thermal envelope of a building, reducing energy costs and increasing the durability of building structures. The properties of materials are determined by their structure, which is formed in the process of technological influences. Formation of the insulating shell of oil and gas industry objects is possible only when considering the special features of the thermal insulation layer in the construction and the use of high-quality materials that retain their characteristics, both in the early stages of operation and throughout the calculation period. The first is achieved by competent design, the second the possibility of assessing the properties of thermal insulation (and predicting changes in these properties over time) directly in the construction site.The methodology for assessing the properties of insulating products includes two main components: testing facility and methodology for assessing operational stability. The methodology of conducting accelerated tests and prediction of durability is tested for mineral wool products of a layered, corrugated and volume-oriented structure. The test results give good convergence with the methods recommended by the building codes.

Torsional Vibrations of a Multi-Rotor System Having a Non-Linear Flexible Coupling

1957 ◽  
Vol 61 (563) ◽  
pp. 779-781
Author(s):  
S. Mahalingam
Keyword(s):  
Forced Vibration ◽  
Elastic Characteristic ◽  
Approximate Solutions ◽  
Forced Vibrations ◽  
Rotor System ◽  
Torsional Vibrations ◽  
Flexible Coupling ◽  
Free And Forced Vibrations ◽  
Non Linear ◽  
Nonlinear Elastic

The free and forced vibrations of a multi-rotor system where one section of the shaft has a nonlinear elastic characteristic are considered in this paper. For any frequency of steady vibration the system is reduced to an equivalent rotor at either end of the nonlinear section. The vibrations at all points are assumed to be one-term approximate solutions and the amplitudes of steady forced vibration are determined by a method outlined by the author in an earlier paper.

scholarly journals Analysis of changes in the survivability of building structures reinforced after an emergency dynamic impact in the context of assessing the security of buildings in the oil and gas industry

2021 ◽  
Vol 8 (12) ◽  
pp. 25-35
Author(s):  
Sarkisov et al. ◽  
Keyword(s):  
Shock Wave ◽  
Oil And Gas ◽  
Energy Parameter ◽  
Oil And Gas Industry ◽  
Building Structures ◽  
Building Structure ◽  
Wave Loads ◽  
Wave Load ◽  
Short Term ◽  
The Impact

The relevance of the subject matter is conditioned by the technical complexity of the oil and gas facilities due to the increase in the volume and rate of raw materials production, which may be affected by shock-wave loads in emergency situations. The causes of the impact can be explosions, heavy cargo falls, terrorist attacks, natural and anthropogenic disasters, etc. These situations are very likely to cause significant damage to the building structures of industrial facilities, which necessitates their reinforcement. For further safe operation of the facility, reinforced structures must have survivability under repeated impacts no less than before the reinforcement. Given the fact that the survivability of buildings is a complex characteristic influenced by many factors, and it itself is a component of the security of a hazardous production facility, research in this area is topical. The purpose of the study is to test the developed method for assessing the survivability of a building structure under short-term shock-wave load based on the energy parameter and to analyze the results obtained in the context of assessing the security of critical oil and gas facilities. Research methods: Measurement of accelerations, deflections, and loads by strain measurement methods, graphoanalytical method of study using the Microsoft Excel software. A method for assessing the level of survivability of a building structure under shock-wave loading for critical oil and gas facilities using the survivability coefficient is developed. Using specific tests of conventional and cage-reinforced bending concrete elements for short-term dynamic load, the values of the specified coefficient are obtained. The values are compared and conclusions are drawn.

scholarly journals Application of two-component technological media for surface processing with a high degree of curvature

2018 ◽  
Vol 224 ◽  
pp. 01018
Author(s):  
Vladislav Smolentsev ◽  
Alexej Kuzovkin ◽  
Igor Drozdov
Keyword(s):  
Electric Field ◽  
High Speed ◽  
Oil And Gas ◽  
Combined Treatment ◽  
Oil And Gas Industry ◽  
Treatment Method ◽  
Space Technology ◽  
Conductive Liquid ◽  
Treatment Zone ◽  
Two Component

The final dimensional combined treatment with the application of an electric field by a tool in the form of unbound metal pellets of complex profile components used in aviation, rocket and space technology and in the oil and gas industry is considered. Such parts include impellers and the flowing component of the turbo-pump units, augers, impellers, where there are sections of variable curvature with limited access of the tool to the processing area. It is shown that the combination in a combined process of two-component technological media from current-carrying granules and an electrically conductive liquid medium supplied at high speed to the treatment zone allows to provide the required technological and operational processing parameters; the action of an electric field from a source with an increased voltage makes it possible to remotely perform a final dimensional processing of the pieces of metal parts with the creation of the required coldhardening against the impacts of solid granules; a combination of mechanical, chemical and magnetic impacts ensures obtaining a given profile accuracy, surface roughness. As a result, it is possible to increase the action and durability of important units of aerospace engineering and oil and gas equipment, and also to expand the area of technological use of the combined treatment method with unbound granules to component parts that are not accessible for processing by an integral tool. In the method under consideration, a universal granule tool is used which does not have a constant geometric shape and is capable of being delivered to the treatment zone through openings into parts whose dimensions are commensurable with the cross-section of the granules.

Deployment of Digital NDT Solutions in the Oil and Gas Industry

2020 ◽  
Vol 78 (7) ◽  
pp. 861-868
Author(s):  
Casper Wassink ◽  
Marc Grenier ◽  
Oliver Roy ◽  
Neil Pearson
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry
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