scholarly journals Absorption methods of control of technical condition of electrical insulation

2021 ◽  
pp. 45-50
Author(s):  
Ivan Kostjukov
Keyword(s):  
Control Method ◽  
Control Object ◽  
Dielectric Materials ◽  
Technical Condition ◽  
Technical State ◽  
Electrical Insulation ◽  
Short Term ◽  
Informative Parameters ◽  
Test Voltage ◽  
Methods Of Control

The article provides an overview of the most common methods for monitoring the technical state of electrical insulation, based on the applying of absorption phenomena arising in dielectric materials under the influence of DC voltage. The main provisions of the control method based on determining the voltage at the electrodes of the investigated capacitive control object, which is recovering after a short-term discharge of its capacity, are described. The main aspects of the application of the polarization index and the absorption coefficient for determining the technical state of insulation by using the coefficients characterizing the change in time of the current through the dielectric when a constant test voltage is applied to it are analyzed. The advantages of using absorption methods for monitoring the technical state of electrical insulation, first of all, are the ability to carry out testing without the necessity of applying of relatively high test voltages, which greatly simplifies all the necessary technical operations. Such control methods show a significant dependence of the informative parameters used in them on the technical state of insulation on the degree of development of slow polarization processes in the material under study and, therefore, are successfully used to determine the degree of moisture in tested electrical insulation.

scholarly journals Analysis of effectiveness of process operational and technological reliability of agricultural mashines

2020 ◽  
Vol 11 (4) ◽  
pp. 143-152
Author(s):  
R. F. Ovchar ◽  
Keyword(s):  
Control Systems ◽  
Industrial Relations ◽  
Control Object ◽  
Functional System ◽  
Technical Condition ◽  
Technical State ◽  
Analytical Models ◽  
Qualitative Assessment ◽  
Quality Of Control ◽  
Combine Harvesters

The analysis suggests that to solve the contradiction between the need of ensuring the required level of serviceability of combine harvesters and capabilities of existing system and repair management of the technical state of combine harvesters at the present stage, there is a need to improve the subsystem recovery combine harvesters subject to the requirements of readiness to perform tasks on purpose and financial capacity for its maintenance. Analysis of scientific literature showed that today the unsolved problem of search and introduction of effective methods and repair combine harvesters are: development of mathematical models of the process and repair, which would allow comparative assessment of technical and economic efficiency of different modes, and repair objects combine harvesters, alternative strategies for their repair, with the aim of improving the quality of control of technical condition of the vessel in conditions of limited funding. Consideration of the process of technical maintenance of combine harvesters as a set of stages and repair objects combine harvesters allows to identify possible directions of improving the system restore. The analysis allowed to determine four basic options for its organization and to make a qualitative assessment of the benefits and disadvantages of each of these options. Reduced operating costs in the operation of combine harvesters, along with other measures of organizational and technical nature require greater automation of control of technical condition. Automation of technical state control of combine harvesters developed in the following areas: embedded systems control, on-board automated control systems, specialized control systems and universal control systems dismantled equipment. A large share of false failures in equipment, violation of industrial relations in the repair network on-board equipment, the shortage of maintenance fund requires implementation and operation. Most fully able to examine the efficiency of the process of operation of complex technical systems using analytical models. Existing approaches to the assessment of the recovery system can be classified also according to the used indicators of effectiveness: the number of constructive variables of units that are replaced (restored) for a predetermined period of operation of the control object, repair cost of the constituent elements of the functional system for a specific period at different depths of the control and completeness of the recovery, the downtime of the test object within a certain period, for comprehensive reliability, such as coefficient of readiness, coefficient of technical use.

scholarly journals Rapid identification of the technical condition of a marine electric power system

2021 ◽  
Vol 2061 (1) ◽  
pp. 012032
Author(s):  
A Saushev ◽  
N Shirokov ◽  
A Butsanets
Keyword(s):  
Power Systems ◽  
Power System ◽  
Electric Power ◽  
Control Object ◽  
Rapid Identification ◽  
Technical Condition ◽  
Electric Power System ◽  
Rate Of Change ◽  
Technical State ◽  
Technical Diagnostics

Abstract The article is devoted to the development of approaches to the rapid identification of the technical condition of marine electric power systems. It is shown that the means of technical diagnostics used on modern ships are used only for maintenance and repair of power equipment and are not adapted to provide preventive control in abnormal operating modes. The definition of rapid identification of a technical state as a process of technical diagnostics of a marine electric power system for the purposes of preventive and emergency control of its technical condition is given. The statement is substantiated that the means of technical diagnostics should not only identify the inoperative state of the system elements, but also predict the mode of its operation after disconnecting the inoperative generator set, provide the information necessary to ensure a trouble-free transition of the electric power system to a partially operable state. It is shown that, in contrast to the existing approaches to diagnosing the technical state of the ship’s electric power system, it is necessary to take into account the rate of change of the controlled parameter, as well as to determine the probable time of its reaching the maximum permissible value. The necessity of identifying an inoperative element of the system and the implementation of control actions to exclude an emergency until the moment of overloading of the operable generating sets, their shutdown by protection and power outage is substantiated. This information in each specific case will allow the decision-making system of the marine electric power system to formulate recommendations for the maintenance personnel and the preventive protection system on the necessary impacts on the control object in order to avoid an emergency. The main reasons for overloading the marine electric power system have been formulated, algorithms have been developed for the practical solution of the problem of rapid identification of the technical state of the system for cases associated with overloading of serviceable electrical machines due to disconnection of inoperative generator sets.

scholarly journals Analysis of vibrodiagnostics methods in the technical state study of designed multimedia mobile scenes

2019 ◽  
Vol 302 ◽  
pp. 01011
Author(s):  
Marcin Łukasiewicz ◽  
Michał Liss ◽  
Natalia Dluhunovych
Keyword(s):  
Modal Analysis ◽  
Diagnostic Tests ◽  
Research Process ◽  
Technical Condition ◽  
Technical State ◽  
Normal Operation ◽  
Design Stage ◽  
Analysis Methods ◽  
State Study ◽  
Diagnostic Research

The paper presents the possibilities of using vibroacoustic methods in the study of the technical condition of designed multimedia mobile scenes. In particular, the possibility of implementing modal analysis methods in modelling and diagnostic research process has been presented. The use of virtual methods enables diagnostic tests both at the design stage and at the stage of normal operation, whereas modal methods help to explain the nature of the work of the element under investigation.

Ground Adaptability Characterization for Digging in Complex Geotechnical Conditions and Risk Mitigation

2011 ◽  
Vol 415-417 ◽  
pp. 1431-1434
Author(s):  
Wei Wei Yu ◽  
Xuan Guo
Keyword(s):  
Risk Factors ◽  
Control Method ◽  
Risk Mitigation ◽  
Tunnel Construction ◽  
Soil Pressure ◽  
Ground Movements ◽  
Construction Risk ◽  
And Control ◽  
Methods Of Control

Characterization of geotechnical digging and control the dynamical settlement is very necessary to mitigate construction risk. The metro tunnels of being constructed access to each other or near to the ground is high risk and physically difficult and costly. The control method becomes imperative. Some cases of digging prediction of ground movements and assessment of risk of damage to above or adjacent constructions have become an important issue especially in urban projec. Ground adaptability characterization is the key of control the tunneling in complex geotechnical conditions both in rock and soft stratum. High and changed water-soil pressure also is risk factors to effect tunneling process. Beside discussion of risk mitigation associate to tunnel construction, the developing settlement control and simulations are given to describe the methods of control risk.

Electrical Insulation Property of Silicone Rubber Tube in High Elevations

2012 ◽  
Vol 503-504 ◽  
pp. 1006-1009
Author(s):  
Guo Min Li ◽  
Chuan Li ◽  
Yun Shui Xu ◽  
Qing Hua Yan ◽  
Shao Quan Zhang ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
High Potential ◽  
Electrical Insulation ◽  
Chain Molecule ◽  
Rubber Tube ◽  
Insulation Property ◽  
Power Frequency ◽  
Test Voltage ◽  
High Elevations ◽  
Potential Test

Silicone rubber is a polymer with the chain molecule structure of Si-O bond [1]. At the environment of 1970 m elevation, the power frequency withstand voltage and condensation experiments will be tested by using two silicone rubber tubes with length of 300mm and 330mm, which lasts one minute, under 85kV. In the high potential test, the silicone rubber tube does not appear the flashover when the surface of tubes weren’t polluted. However, the test voltage increases to 70kV and the surface of the silicone rubber tube will appear flashover, when the tubes are plated in the condensation conditions. The high potential experiments indicate that the electrical insulation property of silicone rubber tube is seriously debated in the humidity environment.

scholarly journals Increased resilience for manufacturing systems in supply networks through data-based turbulence mitigation

2021 ◽  
Author(s):  
Dennis Bauer ◽  
Markus Böhm ◽  
Thomas Bauernhansl ◽  
Alexander Sauer
Keyword(s):  
Manufacturing Systems ◽  
Control Method ◽  
Great Influence ◽  
Learning System ◽  
Effective Control ◽  
Sufficient Information ◽  
Short Term ◽  
Data Format ◽  
Supply Networks ◽  
Manufacturing Control

AbstractIn manufacturing systems, a state of high resilience is always desirable. However, internal and external complexity has great influence on these systems. An approach is to increase manufacturing robustness and responsiveness—and thus resilience—by manufacturing control. In order to execute an effective control method, it is necessary to provide sufficient information of high value in terms of data format, quality and time of availability. Nowadays, raw data is available in large quantities. An obstacle to manufacturing control is the short-term handling of events induced by customers and suppliers. These events cause different kinds of turbulence in manufacturing systems. If such turbulences could be evaluated in advance, based on data processing, they could serve as aggregated input data for a control system. This paper presents an approach how to combine turbulence evaluation and the derivation of measures into a learning system for turbulence mitigation. Integrated in manufacturing control, turbulence mitigation increases manufacturing resilience and strengthens the supply network’s resilience.

scholarly journals Impact of the Engine Tuning on its Technical Condition Assessment Based on Limited Number of Available Parameters

2018 ◽  
Vol 1 (1) ◽  
pp. 721-728
Author(s):  
Marek Łutowicz
Keyword(s):  
Fuel Injection ◽  
Cooling Water ◽  
Technical Condition ◽  
Technical State ◽  
Injection Timing ◽  
Injection Equipment ◽  
Cooling Water Temperature ◽  
Exhaust Temperature ◽  
Marine Diesel ◽  
Engine Components

Abstract Due to the limited scope of the diagnostic equipment on the ship, the technical condition of the engine is based on the measurement of pressure and temperature at the available measuring points. Usually it is the exhaust temperature at the outlet of individual cylinders, supercharging pressure, oil temperature and cooling water temperature. Sometimes the bearing temperature and turbocharger speed are also measured. Normally, if the engine is adapted to this, the maximum combustion pressure is measured periodically although distorted through the channels with the indicator valves. The paper presents examples of the exploitation of marine diesel engines, where there is a discrepancy between the actual technical state of the engine and the technical state of the engine based on the traditional diagnostic method based on a limited set of available parameters. These discrepancies resulted, inter alia, from the regular fuel injection timing and fuel dose adjustment, so that the measured parameters were adequate to the actual load of the engine. This adjustment is justified, but leads to masking engine components wear symptoms. In this situation, it can only be stated that the state of the fuel injection equipment is suitable for the current technical state of the some engine components and does not provide a sufficient basis for the extension of the repair interval.

scholarly journals The Irregularity Change of the Technical State`s Elements of the Vehicle: form Submission

2021 ◽  
Vol 334 ◽  
pp. 02020
Author(s):  
Alexander Novikov ◽  
Sergey Grebennikov ◽  
Alexander Grebennikov
Keyword(s):  
Quantitative Assessment ◽  
Structural Parameters ◽  
Technical Condition ◽  
Technical State ◽  
Operational Cycle

Analyzed the use of the term «irregularity changes of technical condition of element’s vehicle» to certain stages of the operational cycle. Specific examples and quantitative assessment of irregularity changes the structural parameters for the elements, working independently, and interacting in the units or systems of the vehicle.

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