The Use of Electromagnetic-Acoustic Method for Estimating the Stress-Strain State of the Metallic Elements of Power Equipment

2017 ◽  
Vol 743 ◽  
pp. 463-467 ◽  
Author(s):  
Ilvina Gamirovna Khusnutdinova ◽  
Musa Gumerovich Bashirov
Keyword(s):  
Transfer Function ◽  
Strain State ◽  
Acoustic Method ◽  
Technical Condition ◽  
Integral Parameter ◽  
Metallic Elements ◽  
Electromagnetic Acoustic Transducer ◽  
Stress Strain ◽  
Stress Strain State ◽  
Generating Equipment

As the title implies the article deals with the problem of stress-strain assessment of metallic elements in power-generating equipment. An electromagnetic-acoustical method is proposed to test and diagnose the technical condition of power apparatuses. It is stressed that the transfer function is an integral parameter that makes it possible to assess the condition of metal in a unit under test. The studies established the relationship between the quantitative values of polynomial roots of the transfer function in the system “a unit under test - electromagnetic acoustic transducer” and the level of the stress-strain state of metal.

Improving the Operational Safety of Process Pipelines for Hydrocarbon Processing Units

2021 ◽  
Vol 625 (3) ◽  
pp. 10-16
Author(s):  
M. G. Bashirov ◽  
◽  
E. M. Bashirova ◽  
I. G. Yusupova. ◽  
◽  
...  
Keyword(s):  
Transfer Function ◽  
Strain State ◽  
Raw Materials ◽  
Metal Structure ◽  
Technical Condition ◽  
Stress Strain ◽  
Stress Strain State ◽  
Current State ◽  
Operational Safety ◽  
Controlled Object

The current state of ensuring the operational safety of technological pipelines of plants for the processing of hydrocarbon raw materials, the reasons for their failures, which can be accompanied by explosions and fires, the formation of mixtures that have a toxic effect on people and the environment. Insufficient efficiency of the methods and means for assessing their technical state, which are aimed at identifying already developed defects, the need to identify incipient defects in the metal structure against the background of a stress-strain state, are shown. It is proposed to use the transfer function, a dynamic mathematical model of the controlled object, reflecting its operational properties, when assessing the technical condition and resource of technological pipelines. The operational properties of the pipeline are expressed through the mechanical, acoustic, magnetic and electrical properties of the material, which change with a change in the stress-strain state of the pipeline, the initiation and development of damage. Thus, the transfer function makes it possible to assess the current technical condition of the pipeline.

scholarly journals Research on the Stress-Strain State of the Base of Operating Low-Pressure Hydraulic Structures

2019 ◽  
Vol 9 (1) ◽  
pp. 5257-5260
Keyword(s):  
Hydrostatic Pressure ◽  
Strain State ◽  
Low Pressure ◽  
Technical Condition ◽  
Hydraulic Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Weak Soils ◽  
Calculated Model

The analysis of the stress-strain state of one of the operated low-pressure hydraulic structures on weak soils is considered in the paper. Calculated model on estimation of technical condition of designed and operated HS (hydraulic structures) and their bases taking into account a load of own weight of structures and hydrostatic pressure of water of the upper high relief is offered.

scholarly journals ASSESSMENT OF CARRYING CAPACITY OF THE ROUND IN PLAN REINFORCED CONCRETE FOUNDATION FOR THE SILO

2021 ◽  
pp. 28-37
Author(s):  
Yu. Vybranets ◽  
◽  
S. Vikhot ◽  
S. Burchenya ◽  
I. Babyak ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Technical Condition ◽  
Normal Operation ◽  
Structural Safety ◽  
Building Structures ◽  
Structural Elements ◽  
Safe Operation ◽  
Stress Strain ◽  
Stress Strain State

During the design, installation and operation of silos, they have defects and damage of various kinds, which affect the stress-strain state and durability of structural elements. Timely inspections and determination of technical conditions of structural elements of the structure and the site as a whole, will establish the possibility of its further safe operation or the need to restore operational properties by ensuring structural safety and reliability of structures. Therefore, the development of design schemes, methods of calculating the stress-strain state, life expectancy and further reinforcement for round reinforced concrete elements of silos with local damage, is quite relevant. Improper maintenance and operation of structural elements, as well as errors in the design and installation in the future lead to unusable for normal operation and sometimes an emergency. The development of projects to strengthen existing structures is a very responsible matter. The most common solution for strengthening existing foundations is to increase the area of support of the foundation cushion, which is not always possible in a compact building. The purpose of the work is to determine the technical condition of the building structures of the silo and the results of calculations performed in the PC Lira, to offer options for strengthening the foundation on a specific example. Structural solutions of the reinforced concrete monolithic foundation of the silo, the main defects and damages determined by the technical condition of the structure are given. For further safe operation of the structure, it is recommended to reinforce the wall foundations by gluing composite tapes and perform reinforcement of the foundations by controlling the growth of piles in accordance with the additional working design of the structure reinforcement. If the latest recommendations on strengthening and adhering to the safe and reliable operation of construction and structures are followed, further operation of building structures will be safe.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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