scholarly journals DIAGNOSTICS OF ROLLING EQUIPMENT SLIDING BEARINGS

2021 ◽  
pp. 20-26
Author(s):  
Anatoly Gaydamaka ◽  
Yuri Yuri ◽  
Dmytro Borodin ◽  
Il'ya Verba ◽  
Sergіj Krigіn ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Technical Condition ◽  
General Purpose ◽  
Electric Machines ◽  
Sliding Bearings ◽  
Rolling Mills ◽  
Rolling Equipment ◽  
Consulting Services ◽  
Indirect Control ◽  
Lubricating Layer

Peculiarities of rolling bearings operation are analyzed. Methods of diagnostics of general purpose sliding bearings and rolling equipment are considered. Direct control of the maximum allowable wear of plain bearings during operation is proposed. It is advisable to provide remote information and consulting services to technical services of metallurgical enterprises for maintenance, repair and operation of crankshaft bearings. Bearings of electric machines of drives of rolls of rolling mills work in extremely difficult conditions with considerable overloads in the environment of the increased vibration. This leads to premature wear of the liner and its fatigue failure. The technical condition of bearings of electric machines of drives of rolls of rolling mills for the purpose of an exception of an emergency stop of production is carried out by indirect control of temperature and vibration. However, these controls do not guarantee an avoidance of an emergency. All problems with working plain bearings can be grouped into three groups: insufficient bearing capacity of the lubricating layer, unregulated clearance between the shaft and the liner, unsatisfactory technical condition of the bearing surfaces. Insufficient bearing capacity of the lubricating layer is more often associated with loss of lubricant properties due to improper maintenance of the lubrication system. The discrepancy between the size of the gap between the shaft and the liner to the normalized value arises from design, technological and operational reasons. Key words: plain bearing; failure; rolling equipment; direct wear control; remote information and consulting services

scholarly journals TECHNICAL CONDITION OF CORRUGATED METAL TRANSPORT STRUCTURES

2021 ◽  
pp. 38-50
Author(s):  
J. J. LUCHKO ◽  
V. V. KOVALCHUK
Keyword(s):  
Bearing Capacity ◽  
Technical Condition ◽  
The Body ◽  
Soil Environment ◽  
Metal Structures ◽  
Advantages And Disadvantages ◽  
Methods Of Calculation ◽  
Analysis And Synthesis ◽  
The Impact ◽  
Corrugated Metal

Purpose. The purpose of the work is to establish the real technical condition of transport structures made of corrugated metal structures on the basis of the analysis of scientific and technical sources.And to analyze the experience of operation of metal corrugated structures in the soil environment and to form and generalize the problems of ensuring the reliability and durability of structures made of metal corrugated structures in the conditions of operation on railways and highways of Ukraine. Methodology. To achieve this goal, a review of scientific and technical sources and regulations of different countries on the technical condition of transport facilities in Ukraine was conducted. In particular, data on the distribution of bridges and pipes made of corrugated metal structures by mode of transport are given. It is shown that the development and implementation of new technologies for the repair of existing defective pipes and small bridges, both on the railways and highways of Ukraine is a very important issue. A thorough analysis of the experience of operation of corrugated metal structures in the soil environment in different countries was conducted. Data on the main inadmissible defects of pipes and the reasons of their development are given. CMS' (corrugated metal structures) corrosion and other defects are given. A number of examples of overpass defects, collapse of bridges and structures with MCS in operation are presented. The qualitative indicators of metal corrugated structures, their advantages and disadvantages are also considered, the problems and the analysis of ensuring the reliability and durability of the structures with CMS in the conditions of operation on the railways and highways of Ukraine are formulated. Findings. An analysis of domestic and foreign scientific and technical sources on the technical condition of transport facilities in Ukraine was conducted. In particular, the experience of operation of corrugated metal structures in different countries of the world is studied and generalized. The analysis and synthesis of problems of ensuring the reliability and durability of buildings with CMS in the conditions of operation on the railways and highways of Ukraine. Originality. As a result of the analysis of the technical condition of transport facilities operated on railways and highways of Ukraine, it was found that about 15 % of transport facilities – small and medium bridges and culverts on Ukrainian railways and about 45 % of transport facilities on Ukrainian roads have unacceptable defects and require immediate repair and replacement. Also, it was established on the basis of research that there are no methods for assessing the load-bearing capacity of transport facilities with CMS in the presence in the body of the embankment of the railway or highway metal corrugated structures with a diameter greater than 6 m. It was determined that standards don't include regulations on design and monitoring of CMS on railway tracks. Practical value. On the basis of these data it was possible to offer directions of theoretical and experimental research and methods of calculation, tests of CMS and diagnostics of a technical condition of transport structures with CMS. In particular, the measurement of the impact of the environment on the bearing capacity of the CMS and the measurement of residual deformations of the corrugated metal pipe on the railway track. Execution of the analysis and synthesis of methods of calculation of transport constructions with CMS will lead to improvement of methods of calculation of CMS.

scholarly journals Increasing the bearing capacity of the lubricating layer of thrust gas bearings

2019 ◽  
Vol 41 (4) ◽  
Author(s):  
Alexey Kurenskii ◽  
Anatolii Samsonov ◽  
Sergei Solovyov ◽  
Andrei Bondarenko
Keyword(s):  
Bearing Capacity ◽  
Gas Bearings ◽  
Lubricating Layer

scholarly journals Analysis of Exploitation Damages of the Frame Scaffolding

2019 ◽  
Vol 284 ◽  
pp. 08008 ◽  
Author(s):  
Aleksander Robak ◽  
Michał Pieńko ◽  
Ewa Błazik-Borowa ◽  
Jarosław Bęc ◽  
Iwona Szer
Keyword(s):  
Bearing Capacity ◽  
Power Plants ◽  
Selection Process ◽  
Numerical Models ◽  
Technical Condition ◽  
Construction Sites ◽  
Size Type ◽  
Investment Size ◽  
Imminent Threat ◽  
Investment Location

The analyzes and classifications presented in the article were based on the research carried out in the years 2016 to 2018 on a group of over one hundred scaffoldings assembled and used on construction sites in different parts of Poland. During scaffolding selection process efforts were made to maintain diversification in terms of parameters such as scaffolding size, investment size, type of investment, location and nature of conducted 5works. This resulted in the research being carried out on scaffoldings used for church renovation in a small town or attached to the facades of classic apartment blocks, as well as on scaffoldings used during construction of skyscrapers or facilities of the largest power plants. This variety allows to formulate general conclusions about the technical condition of used frame scaffoldings. Exploitation damages of the frame scaffolding elements were divided into three groups. The first group includes damages to the main structural components, which reduce the strength of the scaffolding elements and hence the whole structure. The qualitative analysis of these damages was made based on numerical models that take into account the geometry of the damage and based on computational nonlinear static analyzes. The second group focuses on exploitation damages such as the lack of a pin on the guardrail bolt which may cause an imminent threat to people using scaffolding. These are local damages that do not affect the bearing capacity and stability of the whole structure but are very important for safe use. The last group consider damages that reduce only aesthetic values and do not have direct impact on bearing capacity and safety of use. Apart from qualitative analyzes the article will present quantitative analyzes showing how frequently given type of damage occurs.

scholarly journals ANALYSIS OF MODERN METHODS OF BERTH RECONSTRUCTIONS

2018 ◽  
pp. 140-148
Author(s):  
A.V. Slobodyanik
Keyword(s):  
Comparative Analysis ◽  
Bearing Capacity ◽  
Deep Sea ◽  
Technical Condition ◽  
Reconstruction Methods ◽  
Modern Methods ◽  
Methods Of Reconstruction ◽  
New Facilities

The increase of cargo traffic in Ukrainian ports is constrained due to the lack of deep-sea berths of high bearing capacity. Despite the construction of new facilities, it is necessary to make the most of the existing berthing front. The technical condition of the berthing front, according to the results of the surveys, is in an unsatisfactory state. Many quays need substantial reconstruction in order to increase depths and increase operational loads. In the present work the analysis of modern methods of reconstruction of mooring structures of various designs is carried out. The possibility of their application in various conditions is estimated. A new scheme for reconstruction of berthing facilities is proposed. A comparative analysis of the existing reconstruction methods with the proposed one is made.

scholarly journals Electroresistive method for monitoring the technical condition, quality, reliability and safety the supports of rolling of electrical machines

2022 ◽  
Vol 1211 (1) ◽  
pp. 012021
Author(s):  
K V Podmasreryev ◽  
V V Markov ◽  
V V Mishin ◽  
A V Selikhov ◽  
N V Uglova
Keyword(s):  
Mathematical Modeling ◽  
Electrical Resistance ◽  
Experimental Studies ◽  
Rolling Bearing ◽  
Technical Condition ◽  
Electric Machines ◽  
The State ◽  
Electrical Machines ◽  
Technical State ◽  
Internal Environment

Abstract The necessity of monitoring the technical condition of the rolling supports of electric machines has been substantiated. It is proposed to use the electrical resistance of the bearing as an indicator of the technical condition the rolling support. The results of mathematical modeling of electrical resistance in the form of a function of resistance from factors of the internal environment of the bearing and modes of its assembly and operation in a rolling bearing are presented. An electroresistive method for monitoring the technical state the rolling support is proposed, which differs from the known methods by original algorithms for collecting information about the state of bearing parts, experimental studies have been carried out to confirm the efficiency of this method.

scholarly journals Possibilities of Monitoring the Technical Condition of the Combustion Engine with Starter Load Current

2014 ◽  
Vol 62 (5) ◽  
pp. 961-969
Author(s):  
Michal Jukl ◽  
Adam Polcar ◽  
Jiří Čupera
Keyword(s):  
Combustion Engine ◽  
Technical Condition ◽  
Load Current ◽  
Technical Requirements ◽  
Indirect Control ◽  
Harmful Emissions ◽  
Measurement Results ◽  
Engine Wear ◽  
The Individual

This article deals with the verification of relations between the electric current of engine starter and tightness of the combustion chamber and the possibility of its use for the evaluation of the state in terms of engine wear. Engine wear is closely related to the quality of fuel combustion and also with the amount of produced harmful emissions. On this basis, it would be possible to extend the technical requirements of the protocol OBD to include the indirect control of engine wear. To meet the objectives set out above measurement was carried out by a petrol engine, which was located in the vehicle Škoda Felicia Combi GLX 1.3 The whole measurement was divided into several parts. The first measurement was carried out on the abovementioned motor without simulating leakage. The second measurement was performed when the leakage of one cylinder was simulated. Simulated leakage was conducted at removing the spark plugs. Other measurements simulated “mild” leak of the whole engine – all cylinders. Leakage was implemented by loosing all the spark plugs about 8 turns against full tightening with the appropriate torque. The last, fourth measurement simulates a “large” leaks of engine cylinders. This leakage was induced by removing all the spark plugs from all cylinders. As the measurement results showed leakage of one cylinder, and also the whole engine is reflected not only in the individual amplitude of the starter current, but also the shape of the entire curve.

Estimation of the resource of sliding bearings of roll reinforcement in section rolling mills

2021 ◽  
pp. 43-46
Author(s):  
Keyword(s):  
Hot Rolling ◽  
Rolling Mill ◽  
Design Parameters ◽  
Wear Model ◽  
Section Mill ◽  
Sliding Bearings ◽  
Rolling Mills ◽  
Bearing Unit ◽  
Rolling Roll ◽  
Section Rolling

A new bearing unit is developed for the input roll reinforcement of the stands of 170 ПАО MMK section mill. A model of wear of sliding bearings is considered, which establishes the influence of the design parameters of the bearing, the frictional characteristics of materials and the conditions of surface treatment on the resource, friction force and contour pressure. Keywords: section rolling mill, hot rolling, roll reinforcement, sliding bearings, wear model, resource. [email protected]

Bearing Capacity of Suction Caisson Foundations Using FEM Analysis

2011 ◽  
Vol 243-249 ◽  
pp. 2112-2115
Author(s):  
Zhi Yun Wang ◽  
Mao Tian Luan ◽  
Lu Shen
Keyword(s):  
Bearing Capacity ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Fem Analysis ◽  
General Purpose ◽  
Combine Loading ◽  
Element Analysis ◽  
Suction Caisson ◽  
Caisson Foundations ◽  
Suction Caisson Foundation

To understand features of bearing capacity of suction caisson foundation is one of the key issues in design and construction of deep-water marine structures. In this paper, the general-purpose finite element analysis package ABAQUS is employed to conduct three-dimensional numerical analyses on load-carrying features of suction caisson foundation under vertically uplift load, horizontal load and moment. Then the ultimate bearing capacity of suction caisson foundation for undrained condition of the soil is evaluated by displacing-controlling procedure. Moreover, three-dimensional failure envelope of suction caisson foundation under combine loading condition are established by the proposed numerical procedure.

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