scholarly journals DETERMINATION OF THE TECHNICAL CONDITION OF THE ELECTRIC MOTOR UNDER INCOMPLETE INITIAL DATA CONDITIONS

2021 ◽  
pp. 136-148
Author(s):  
Oleksandr Rubanenko ◽  
Oleksii Tokarchuk
Keyword(s):  
Electric Motor ◽  
Residual Life ◽  
Technical Condition ◽  
Electric Motors ◽  
Diagnostic Parameters ◽  
Current State ◽  
Neuro Fuzzy ◽  
National Economic ◽  
Predicted Values

The article analyzes the damageability of electric motors at agricultural processing enterprises in Ukraine. Modern microprocessor systems are being introduced in order to automate the process of determining the technical condition of electric motors. Their software implements complex and informative methods for determining the current state of electric motors based on the analysis of the current values of diagnostic parameters. The current values of not all diagnostic parameters of electric motors are known at the time of determining the technical condition. Therefore, their predicted values are applied. The authors propose to evaluate the current technical condition of electric motors by analyzing the value of the coefficient of its residual life. The values of this coefficient vary from 1 p.p. (the engine is fine) to 0 p.p. (the engine is defective.) An example shows the use of software, namely, Anfis editor of the Fuzzy Logic Tool Box application of the Matlab application package, for creating a mathematical model of the residual life coefficient of an electric motor. It is noted that the error in training the model based on 582 considered variants of combinations of diagnostic parameters and the corresponding values of the residual life of the electric motor does not exceed 0.00288 p.p. (0.2%), and for test voters – 4.1%. Taking into account the large number of mutually influential diagnostic parameters of electric motors, in order to simplify the assessment of the current technical condition, we propose to use the integral diagnostic parameter  the coefficient of residual life. At the same time, it is difficult to determine the technical condition of a working electric motor, because some diagnostic parameters can be measured in a disconnected or disassembled electric motor (for example, measuring the insulation resistance of the stator winding with a megaohmmeter or measuring the diameter of the rotor shaft under the bearing in order to identify the cause of vibration). Therefore, determined at the rate of the process, under such conditions, the technical state of the operating electric motor is predictable  fuzzy. To determine it, one should use the methods and means of neuro-fuzzy modeling. Therefore, the problem of improving the quality of operation of electric motors in agricultural production by improving the quality of their diagnostics is relevant and of great national economic importance.

scholarly journals Voltage Spectral Structure as a Parameter of System Technical Diagnostics of Ship Diesel Engine-Synchronous Generators

2015 ◽  
Vol 8 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Aleksandrs Gasparjans ◽  
Aleksandrs Terebkovs ◽  
Anastasia Zhiravetska
Keyword(s):  
Diesel Engine ◽  
Spectral Power ◽  
Angular Acceleration ◽  
Piston Compressor ◽  
Technical Condition ◽  
Electric Machine ◽  
Technical Diagnostics ◽  
Spectral Structure ◽  
Diagnostic Parameters

Abstract A method of technical diagnostics of ship diesel engine – generator installation – is proposed. Spectral-power diagnostic parameters of the synchronous generator voltage and currents are used. The electric machine in this case is the multipurpose sensor of diagnostic parameters. A judgment on the quality of the operational processes in diesel engine cylinders and its technical condition is possible on the basis of these parameters. This method is applicable to piston compressor installations with electric drive. On the basis of such parameters as rotating torque, angular speed and angular acceleration it is possible to estimate the quality of the operating process in the cylinders of a diesel engine, the condition of its cylinder-piston group and the crank gear mechanism. The investigation was realized on the basis of a diesel-generator with linear load. The generator operation was considered for the case of constant RL load. Together with the above mentioned, the condition of bearings of synchronous machines, uniformity of the air gap, windings of the electric machine were estimated during the experiments as well. The frequency spectrum of the stator current of the generator was researched and analyzed. In this case the synchronous machine is becoming a rather exact multipurpose diagnostic sensor. The signal of non-uniformity in the operation process of diesel engine cylinders and its technical condition is the increasing of the amplitudes of typical frequencies.

scholarly journals Method for the diagnosis of high-voltage dielectric elements during operation based on dynamic registration of electromagnetic radiation

2020 ◽  
Vol 216 ◽  
pp. 01061
Author(s):  
Dmitry Ivanov ◽  
Tatyana Galieva ◽  
Marat Sadykov ◽  
Alexander Golenischev-Kutuzov ◽  
Anatoly Naumov
Keyword(s):  
High Voltage ◽  
Residual Life ◽  
Technical Condition ◽  
Time Of Arrival ◽  
Frequency Method ◽  
Diagnostic Parameters ◽  
Reliable Assessment ◽  
The Difference ◽  
The Moment

Complex remote monitoring and the developed non-contact diagnostic device (NDD) allow monitoring the technical condition and revealing the residual life of high-voltage dielectric elements. It is based on non-contact remote periodic measurement of a set of diagnostic parameters (characteristics of electrical discharges emitted by insulators during operation) necessary for a reliable assessment of the operating state of high-voltage dielectric equipment at the moment of operation and determination of its residual life. NDDs are installed on each phase conductor and used to measure diagnostic parameters, followed by computer processing of the accumulated information signals. An analysis of the set of necessary diagnostic parameters makes it possible to form a conclusion on the degree of performance of dielectric elements. The paper considers a method for detecting defective high-voltage insulators using the developed non-contact diagnostic devices by the radio frequency method and assessing the difference in time of arrival of a partial discharge signal.

The Method of Evaluation of the Resource of Complex Technical Objects, in Particular, Aviation

2020 ◽  
pp. 214-230
Author(s):  
Lyudmyla Kuzmych ◽  
Volodymyr Kvasnikov
Keyword(s):  
Residual Life ◽  
Control Object ◽  
Technical Condition ◽  
Actual State ◽  
Production Operation ◽  
Limit Values ◽  
Diagnostic Parameters ◽  
Design Production ◽  
Method Of Evaluation ◽  
Periodic Inspections

The method of estimating the resource of complex technical objects, in particular, aviation technique, is proposed, which includes the construction of a mathematical model of the object's functioning to determine its actual technical condition and residual resource for planning, design, production, operation, repairs, and modernization of aviation technique. To determine the actual state and estimate the residual life of structures, it is proposed to simultaneously evaluate several characteristics of the material of the object: the characteristic parameters of the structure of the material, integral parameters of the material, related to strength (for example, hardness), the presence and nature of macro defects, the degree of corrosion wear of the metal. Limit values of the selected diagnostic parameters are determined by available standards or technical conditions for objects. The dynamics of changes in diagnostic parameters can be monitored and modeled on the basis of the data of periodic inspections of the control object.

scholarly journals Improving the efficiency of timber sawing process by increasing reliability of attachments for forestry equipment

2021 ◽  
Vol 285 ◽  
pp. 07006
Author(s):  
M. Zyryanov ◽  
A. Saltanov ◽  
A. Davydenko ◽  
E. Dozhdev
Keyword(s):  
Technical Condition ◽  
Nature Management ◽  
Design Solution ◽  
Resource Saving ◽  
Current State ◽  
Environmentally Sound ◽  
Sawing Process ◽  
Further Development ◽  
Round Timber

The current state of the timber industry complex and the prospects for its further development indicate the need to revise the approach to organizing logging process as a resource-saving, economically and environmentally sound process. Rational nature management and careful use of available forest resources come to the fore. Today, logging machines are an integral part of logging, and technical condition of the equipment of these machines has a direct impact on their productivity, quality of round timber and amount of sawmill waste received. The paper presents a design solution that makes it possible to increase efficiency of forest machines in freezing temperatures, which increases their productivity and the quality of the resulting roundwood by reducing the generated logging waste.

scholarly journals A System for the Remote Monitoring of Vehicle Technical Condition: Kirovets Tractor Gearbox Case Study

2021 ◽  
Vol 15 (3) ◽  
pp. 22-27
Author(s):  
M. N. Kostomakhin ◽  
N. A. Petrishchev ◽  
A. S. Sayapin
Keyword(s):  
Remote Monitoring ◽  
Residual Life ◽  
Operational Reliability ◽  
Technical Condition ◽  
Diagnostic Tools ◽  
Diagnostic Parameters ◽  
Individual Unit ◽  
Direct Measurements ◽  
Actual Change ◽  
The Individual

Abstract. The authors noted that in order to increase the energy-saturated equipment technical readiness, reduce its operation costs and ensure full use of the resource, it is necessary to quickly assess the current technical condition. The authors have created a counter-indicator prototype for high-precision control of gearbox technical condition. (Research purpose) To formulate a proposal for developing a system for the remote monitoring of gearbox technical condition applicable to the Kirovets tractor family. (Materials and methods) To increase the precision level of traceability and technical condition detection, a system of diagnostic tools was proposed based on the developed counters-indicators, which take into account design features when determining diagnostic parameters. (Results and discussion) It was shown that to assess the gearbox technical condition, it is necessary to use additional monitoring systems, obtain information for calculating the residual life, when using direct measurements and having a possibility of the ongoing monitoring over the actual change in the gearbox units diagnostic parameters. The authors studied the options for using meter-indicators to minimize group II and III failures during operation.(Conclusions) It was identified that in order to increase the level of gearbox operational reliability, it is necessary to introduce a system of counters-indicators. The authors revealed the possibility of monitoring the individual unit technical condition in accordance with the specified indicators, as well as in order to prevent operation in emergency (abnormal) modes.

USE OF INDUCTION HEATING FOR REPAIRING ELECTRIC MOTORS

2020 ◽  
Vol 15 (4) ◽  
pp. 528-534
Author(s):  
T.N. Sterkhova ◽  
Keyword(s):  
Induction Heating ◽  
Electric Motor ◽  
Eddy Currents ◽  
Heating Temperature ◽  
Operating Time ◽  
Heating Process ◽  
Electric Motors ◽  
Current Frequency ◽  
Physical Strength

The quality of the production process depends on the reliability of technological and electrical equipment. The technological process of repairing electric motors includes the assembly of the electric motor and its installation. To date, the dominant position for performing this operation is occupied by the methods of “sledgehammers” or “oil baths”. The assembly of the electric motor can be carried out after heating of its individual parts. Both of these assembly methods are quite time-consuming, time-consuming and require significant physical strength from the maintenance staff. One of the main tasks is to heat the motor housing to the required temperature, which ensures the free installation of the stator and rotor. The possibility of using induction heating at the final stage of repair of an electric motor is considered. Induction heating is the heating of conductive bodies in an electromagnetic field due to the induction of eddy currents in them. In this case, electrical energy is converted into thermal energy due to its triple conversion. The intensity and nature of the heating are influenced by the current frequency, the strength of the electric and magnetic fields. By changing the indicated values, it is possible to obtain the necessary character of heating, its intensity and uniformity. For the study, the line equipment and the assembly process of 14 sizes of electric motor housings of the DATA and AIML series were considered. Calculation of heating temperatures for connection with interference fit of the DATA 63 electric motor housing with a stator and a rotor with a bearing was made. The calculation results of the heating temperature in two ways showed that using the induction method, the elements of the electric motor heat up 15% faster than during the operation of the heater. When creating the installation, the following requirements must be taken into account: high electrical and thermal efficiency, ease of maintenance, ease of controlling the heating process, and the possibility of its full automation. The use of induction heating allows one to automate the heating process and assembly of the electric motor, and makes it possible to increase the accuracy of the process without reducing operating time, increasing the stability and quality of the entire process.

Manajemen Ekonomi Outopilot: Kegagalan Negara Mencari Identitas?

Liquidity ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 142-152
Author(s):  
Mukhaer Pakkanna
Keyword(s):  
Economic Development ◽  
National Economy ◽  
The State ◽  
Political Democracy ◽  
Economic Democracy ◽  
Quality Of Democracy ◽  
Economic Disparities ◽  
National Economic ◽  
Production And Distribution

Political democracy should be equivalent to the economic development of the quality of democracy, economic democracy if not upright, even the owner of the ruling power and money, which is parallel to force global corporatocracy. Consequently, the economic oligarchy preservation reinforces control of production and distribution from upstream to downstream and power monopoly of the market. The implication, increasingly sharp economic disparities, exclusive owner of the money and power become fertile, and the end could jeopardize the harmony of the national economy. The loss of national economic identity that makes people feel lost the “pilot of the state”. What happens then is the autopilot state. Viewing unclear direction of the economy, the national economy should clarify the true figure.

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

1990 ◽  
Vol 18 (4) ◽  
pp. 216-235 ◽  
Author(s):  
J. De Eskinazi ◽  
K. Ishihara ◽  
H. Volk ◽  
T. C. Warholic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Element Analysis ◽  
Vertical Loading ◽  
Predicted Values ◽  
Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

The Development of Agritourism in the Podkarpackie Voivodeship in the Light of International and National Conditions

2017 ◽  
Vol 13 ◽  
pp. 244-261
Author(s):  
Mariola Tracz ◽  
Małgorzata Bajgier-Kowalska ◽  
Radosław Uliszak
Keyword(s):  
Development Strategy ◽  
Current State ◽  
Central Statistical ◽  
Central Statistical Office ◽  
Tourism Resources ◽  
The One ◽  
The Impact ◽  
District Offices ◽  
Socio Economic Factors

Podkarpackie Voivodeship is one of the regions of Poland in which the number of agritourism entities is very high. Therefore tourism plays a significant role in its development strategy. The aim of the paper is to identify the current state of agritourism and the changes that have occurred in the region in the years 2000–2016. Specific objectives are to determine the distribution of agritourism farms and their offer, together with a comprehensive analysis of the environmental and socio-economic factors, as well as the impact of the Slovak-Ukrainian border. The report was developed on the statistical materials from the Polish Central Statistical Office, Podkarpackie Agricultural Advisory Centre in Boguchwała and data collected from municipalities and district offices that is published on their websites, as well as through interviews with 100 owners of agritourism farms in the Podkarpackie Voivodeship. The research has shown, on the one hand, the decline in the number of farms in the region and, on the other hand, the increase in the diversity of the tourist offer of these entities. Distribution of agritourism farms is closely linked to the attractiveness of natural environment and quality of secondary tourism resources. Traditional agritourism has not yet fully used its countryside, as well as cross-border advantages of its location.

PROFESSIONAL TRAINING OF ELECTRONICS ENGINEERS: APPLYING US EXPERICENCE TO UKRAINAN HIGHER EDUCATION INSTITUTIONS

2020 ◽  
pp. 80-85
Author(s):  
Olha Pavlenko
Keyword(s):  
Higher Education ◽  
Education Research ◽  
Best Practices ◽  
Cost Reduction ◽  
Professional Training ◽  
Higher Education Institutions ◽  
Academic Staff ◽  
Research And Innovation ◽  
Current State

The article discusses the current state of professional training of engineers, in particular, electronics engineers in Ukrainian higher education institutions (HEIs) and explores best practices from US HEIs. The research outlines the features of professional training of electronics engineers and recent changes in Ukrainian HEIs. Such challenges for Ukrainian HEIs as lack of collaboration between higher education and science with industry, R&D cost reduction for HEIs, and downsizing the research and academic staff, the disparity between the available quality of human capital training and the demanded are addressed. The study attempts to identify successful practices of US HEIs professional training of engineers in order to suggest potential improvements in education, research, and innovation for training electronics engineers in Ukraine.

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