DETERMINE THE EFFECT OF DESTRUCTION OF ELEMENTS OF THE BASE ON GENERAL TECHNICAL CONDITION OF HOUSING FACILITIES

2014 ◽  
Vol 2 (3) ◽  
pp. 0-0
Author(s):  
Марина Шутова ◽  
Marina Shutova ◽  
Анатолий Субботин ◽  
Anatoliy Subbotin ◽  
Сергей Болдарев ◽  
...  
Keyword(s):  
Construction Projects ◽  
Standard Procedure ◽  
Technical Condition ◽  
Actual State ◽  
Technical Inspection ◽  
Physical Deterioration ◽  
General Technical ◽  
Housing Facilities

The article is devoted compared the results of determination of physical deterioration and condition of foundations housing facilities according to the standard procedure and the actual state of foundations, estimated by the results of a full technical inspection of construction projects

Examination of State of the Cable Insulation by the Return Voltage

2018 ◽  
Vol 19 (6) ◽  
Author(s):  
Dmitry Semenov ◽  
Anna Sidorova ◽  
Pavel Romanov ◽  
Aleksey Kuvshinov
Keyword(s):  
Residual Life ◽  
Technical Condition ◽  
Actual State ◽  
Power Cables ◽  
Insulation Resistance ◽  
Cable Lines ◽  
P Factor ◽  
Paper Insulation ◽  
New System

Abstract The relevance of the study is conditioned by the need to determine the state and residual life duration of high-voltage cable lines to identify faulty and maintainable cables. The aim of the article is to determine a reliable scientifically grounded criterion for assessment of insulation characteristics of the cables in use and to perform a comparative analysis of the results obtained by the traditional method of diagnosing insulation with the results of a new method of assessment by the return voltage. In this regard, the article deals with the issues related to the testing of cables having oil-impregnated paper insulation, as well as with the issue of switching from planned replacement of cables to assessment of their actual state and period of residual life. The authors propose to use the method of examining the cables by the return voltage using the device for testing electrical insulation “UDEI-1” developed at the department of Electrification and Automation of the Nizhny Novgorod State University of Engineering and Economics. The article presents the results of measuring the return voltage of three cables that operated under different conditions. The cables had different technical state. The analysis of the estimation of the residual life of cables by the return voltage was carried out using such criteria as the PIRV polarization index, the LIRV electrical conductivity index, and the P-factor. The P-factor is the physical criterion demonstrating the aging of paper-oil insulation by the shape of the return voltage curve. It represents such characteristics of insulation aging as moistening. To compare the results of testing the cables by the return voltage with the conventional methods of diagnostics and to determine the actual technical condition of power cables, the authors applied the method of spatiotemporal reflectometry and the method of measuring insulation resistance with the determination of such indicators of state as insulation resistance normalized per one kilometer, absorption coefficient, and polarization index. The results of this article confirm that the return voltage gives a qualitative assessment of the state and degree of aging of cables with impregnated paper insulation. The authors proposed a new system for evaluation of cable condition by weighting coefficients. In this approach, the determination of residual life of cables with impregnated paper insulation is based on the values of the return voltage. Application of the new system gives opportunity to improve reliability of the power lines. Recommendations for the further operation of the studied cables are given. The materials of the article are of practical value for carrying out complex assessment of the technical condition of power cables by the return voltage and can be useful for drawing up a schedule for replacement or repair of cable lines depending on their actual state.

scholarly journals THE ALGORITHM OF COMPLEX DIAGNOSTICS OF TECHNICAL CONDITION OF BUILDING STRUCTURES ON THERMOGRAMS ANALYSIS

2020 ◽  
pp. 23-28
Author(s):  
D. Karpov
Keyword(s):  
Construction Projects ◽  
Thermal Power ◽  
Technical Condition ◽  
Building Structures ◽  
Structural Elements ◽  
Highly Qualified ◽  
Energy Survey ◽  
Measurement Base ◽  
Actual Mass

the algorithm of complex diagnostics of a technical condition of building constructions and structures on the analysis of thermograms is offered. An attempt is made to systematize and logically build a sequence of stages of energy inspection of heat-consuming and heat-generating construction projects and their structural elements. The presented algorithm includes the main stages performed in such surveys. It differs from the known technologies of energy monitoring of buildings and structures by the presence of two additional stages, which are an integral part of any energy survey: determination of the relative surface humidity of building structures and the actual mass flow of coolant through the heating device for the analysis of thermal images. The implementation of energy (thermal imaging) and technical inspections according to the presented structural scheme requires not only the presence of appropriate instrumentation and measurement base, but also the involvement of highly qualified specialists (civil engineers, thermal power engineers, thermal physicists, operators-thermographers, etc.).

Digital assessment of reliability of production system of power subjects

2018 ◽  
Vol 11 (2) ◽  
pp. 109-116
Author(s):  
S. V. Mishcheryakov
Keyword(s):  
Human Capital ◽  
Production System ◽  
Target Function ◽  
Technical Condition ◽  
The State ◽  
Actual State ◽  
Fuel Supply ◽  
Digital Assessment ◽  
Optimal Values

The article outlines scientifi c approaches to the formation of digital technologies for managing the main factors of energy production. The assessment of the state of the production system is based on the index of the state of the production system of the power facility. Its target function is formulated, including dimensionless indices of fuel supply, the state of material and human capital assets. The author has formulated and solved the problem of finding the optimal values of a function using the mathematical apparatus of fuzzy sets. The indices characterizing the factors of production are defined as the solution of the optimization problem using ranking by values and weight coefficients determined by Saaty’s method. The determination of the fuel supply index and the technical condition of assets is carried out on the basis of the methods adopted in the energy sector, taking into account their actual state, provided that the reliability of the functioning of the UES is ensured. The article discusses in detail the technologies for assessing the company's human capital, shows the investment benefits of its development, presents the rational ranges of these investments, and provides statistical data that support the theoretical conclusions.

Determining The Service Life Of Structures, Buildings And Facilities

2020 ◽  
pp. 12-17
Keyword(s):  
Service Life ◽  
Construction Projects ◽  
Operation Time ◽  
Residential Building ◽  
Technical Condition ◽  
Komi Republic ◽  
Production Costs ◽  
Residual Service Life ◽  
Current Economic Situation

The determination of the service life (residual resource) of buildings and structures during operation and during reconstruction becomes particularly relevant, because the current economic situation requires a significant reduction in production costs, which is facilitated by the use of sound scientifically and in detail developed strategies for the operation of construction projects, including the conduct of scheduled-preventive and capital repairs. The article considers the existing methods of determining the residual service life of structures of buildings and facilities in Russia. The necessity of updating and correcting the above methods in terms of clarifying the significance coefficients for elements of buildings is justified, as well as recommendations for supplementing the State Standard "Buildings and Structures. Rules for Inspection and Monitoring of Technical Condition" are made. The methods considered in the article make it possible to estimate the physical depreciation and the remaining operation time of buildings before capital overhaul based on the technical condition of the building, obtained on the basis of the survey, which is confirmed by the considered example of a residential building in the city of Sosnogorsk (Komi Republic).

scholarly journals Bridges maintainability evaluation peculiarities as part of hydraulic structures

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Boris Bondarev ◽  
Vladimir Erofeev ◽  
Alexandr Bondarev ◽  
Anastasia Korneeva ◽  
Mihail Gavrilov ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Technical Condition ◽  
Hydraulic Structures ◽  
Actual State ◽  
Final Report ◽  
Shock Pulse ◽  
Structural Elements ◽  
Monitoring Method ◽  
Elastic Rebound

Introduction: the article is dedicated to assessing the condition with respect to use for traffic methods of bridges as part of hydraulic structures (dams, hydroelectric power stations, locks). The main factors affecting the structural element’s durability included in the composition of the hydraulic structures are dynamic loads (applied repeatedly and repeated) affecting the bay due to the hydrodynamic effect; temporary, moving loads from passing highway transportation, along the top of the structure (along the roadway); harmful chemical impurities contained in the water passing through the structure. Under the influence of the above-mentioned factors, defects and damage occur in the hydraulic facilities’ structural elements. Methods: the authors assessed the actual state of the material of the operating structure. To assess structures and materials actual state during the bridge structure inspection work, the following instrumental measurements were performed on as-built structural elements: leveling the top of the sidewalks and the roadway; materials strength determination of the main supporting structures by nondestructive methods; thickness measuring the asphalt concrete pavement of the roadway; determination of the degree of carbonation of concrete; identification of defects in the elements of the bridge. The actual structure’s concrete strength was determined by nondestructive testing methods: (1) by the method of the elastic rebound; (2) by the shock pulse monitoring method; (3) an indirect method of concrete strength ultrasonic testing based on the revealed relationship between the method of separation with shear test and methods – shock pulse and elastic rebound. Results: technical condition and bridge safety indicators calculation as a hydraulic structure element was executed. Discussion: technical examination results of the bridge structural elements and instrumental studies confirm the conclusion about the repair measures need with high-strength concretes and protective coatings based on polymer composite materials. Final report: following the emergency scenarios a numerical estimate table for the quantitative and qualitative parameters list was made, parameters corresponding to a particular structure state. Thus, according to the scenario related to the 3rd accident group, the bridge technical condition is assessed as limited operable, and the safety level is reduced.

scholarly journals Determination of the region of the limiting states occurrence in RVS-20000 with the subsidence of the external bottom contour

2018 ◽  
Vol 239 ◽  
pp. 06002
Author(s):  
P.V. Chepur ◽  
A.A. Tarasenko ◽  
A.A. Gruchenkova
Keyword(s):  
Technical Condition ◽  
Element Analysis ◽  
Metal Structures ◽  
Software Complex ◽  
Managerial Decisions ◽  
The Finite Element Analysis ◽  
Steel Tank ◽  
Intrinsic Stiffness ◽  
Bottom Contour

The problem of the limiting states occurrence in the structures of a vertical steel tank is investigated in this work. To study the SSS of the metal structures of the object, the authors created a numerical model of the RVS-20000 tank in the ANSYS software complex. The model considers the maximum number of elements with their geometry and connections affecting the tank SSS under non-axisymmetric loading, including beyond the elasticity of steel. Dependences between the parameters of intrinsic stiffness of the VST are obtained. The results of the finite element analysis made it possible to develop a technique for assessing the technical condition of the structure with the development of irregular subsidence of the external bottom contour. The proposed technique can be used by both operating and design organizations in making managerial decisions regarding the repair of RVS-20000 subjected to the base subsidence.

A Reliability-Based Approach to Assess Fatigue Behaviour Based on Small Incomplete Data Sets

2008 ◽  
Vol 44-46 ◽  
pp. 871-878 ◽  
Author(s):  
Chu Yang Luo ◽  
Jun Jiang Xiong ◽  
R.A. Shenoi
Keyword(s):  
Incomplete Data ◽  
Standard Procedure ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Small Sample ◽  
Data Sets ◽  
Safe Life ◽  
A New Technique ◽  
And Performance

This paper outlines a new technique to address the paucity of data in determining fatigue life and performance based on reliability concepts. Two new randomized models are presented for estimating the safe life and pS-N curve, by using the standard procedure for statistical analysis and dealing with small sample numbers of incomplete data. The confidence level formulations for the safe and p-S-N curve are also given. The concepts are then applied for the determination of the safe life and p-S-N curve. Two sets of fatigue tests for the safe life and p-S-N curve are conducted to validate the presented method, demonstrating the practical use of the proposed technique.

scholarly journals Detection of Tree Roots in an Urban Area with the Use of Ground Penetrating Radar

2016 ◽  
Vol 17 (4) ◽  
pp. 362-370 ◽  
Author(s):  
Alexander Krainyukov ◽  
Igor Lyaksa
Keyword(s):  
Urban Area ◽  
Ground Penetrating Radar ◽  
Growth Direction ◽  
Technical Condition ◽  
Tree Roots ◽  
Secondary Processing ◽  
Non Invasive ◽  
Ground Penetrating ◽  
The Given

Abstract The paper is devoted to using ground penetrating radar (GPR) for the detection of tree roots in an urban area, since GPR allow detect the hidden objects in non invasive way. It is necessary exactly to know the growth direction, thickness and depth of the roots of the tree to confidently assert about the tree root influence on the technical condition of engineering objects and structures: of the buildings, of pavements, of roadway, of engineering communications and etc. The aim of the given research was experimentally to evaluation the possibilities of detection of tree roots in an urban area with the use of GPR on frequency 400 MHz and of algorithms of secondary processing of GPR signals. Results of interpretation of radar profile and evacuation of soil around tree show the possibility of detection of the tree roots and the determination of their parameters using one or two radar concentric profiles.

The Influence of Diagnostic Signal Measurement Period on Blades Technical Condition Images Determined from Phase Shift Difference

2013 ◽  
Vol 199 ◽  
pp. 67-72 ◽  
Author(s):  
Rafał Grądzki
Keyword(s):  
Phase Shift ◽  
Damage Detection ◽  
Technical Condition ◽  
New Method ◽  
Diagnostic Model ◽  
Inductive Sensor ◽  
Blade Tip ◽  
Space Range ◽  
Measurement Period

In the article, new method of monitoring of rotor machine blades technical condition is presented. This method is based on diagnostic model φT12T01 [ which uses phase shift difference of signal fragments resulting from blade operation y (t) during blade recession from sensor and during approach of blade tip towards the sensor as well as signal of its environment x (t) described using proper distribution. The assumed diagnostic model also indirectly includes actual blade environment x (t) without necessity of its measurement [3,. Contactless inductive sensor constantly measures the signal of operating blade transition below the sensor. However, several difficulties with determination of last sample of blade receding from the sensor with first sample of blade approaching the sensor exist. Additionally the problem occurs with measurement of space between blades. So far, the case was solved by use 90% of this space range (in order to eliminate the overlapping of adjacent blades signals). Hence the problem of assessment of measurement period breadth on obtained models (images) of blades. The possibility of blade damage detection by analysis of less than 90% signal course was tested.

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