Kontrol'. Diagnostika最新文献

{"title":"STUDY OF THE PARAMETERS OF BOTTOM ECHO IN THE TRANSITION FIELD OF THE NORMAL PROBE","authors":"V. N. Danilov","doi":"10.14489/td.2023.06.pp.004-011","DOIUrl":"https://doi.org/10.14489/td.2023.06.pp.004-011","url":null,"abstract":"By the method of computer simulation of the bottom echo in the transition field of the normal probe, calculations of frequency spectra and pulses for distances equal to 1 and 2 near field of the probe with a nominal frequency of 1.8 and 2.5 MHz were carried out. Calculations were carried out using the spectral density of the function describing the change in the complex amplitude of the bottom echo to the boundary of the near field of the probe. It is found that the change in the amplitude of the pulses at the maximum of the envelope for these distances varies almost the same as in the DGS-diagram of the bottom echo, while the difference in pulse shapes is not very significant. The results of the experiments generally confirmed the results of calculations taking into account the error of the initial data and the features of computer modeling.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139371646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"QUANTITATIVE ANALYSIS OF THE DISTRIBUTION OF LOCAL POROSITY IN CARBON FIBER STRUCTURES BY LASER OPTOACOUSTIC METHOD","authors":"Yu. G. Sokolovskaya, N. Podymova","doi":"10.14489/td.2023.06.pp.012-019","DOIUrl":"https://doi.org/10.14489/td.2023.06.pp.012-019","url":null,"abstract":"Currently, an urgent problem is the development of non-destructive diagnostic techniques for quantifying the level of local porosity of composite structures. The paper presents a method for estimating the porosity of a material from the experimentally measured phase velocity of longitudinal acoustic waves propagating in it. Laser excitation of ultrasound was used to create probing pulses. Porosity was calculated using experimentally measured phase velocities of longitudinal acoustic waves propagating in the composite. The proposed method allows one-way access to the object during measurements, which makes it possible to study structures of variable thickness and complex shape. The possibility of obtaining distributions of local porosity values in the studied section of the structure is demonstrated by the example of three carbon fiber stringer panels. The study showed that locality of the porosity value and its change from point to point plays an important role in such constructions, and the maximum local porosity of this area of the panel may differ from the average volumetric porosity by more than two times. The possibility of obtaining a “map” of the distribution of the local porosity of the panel section in the plane of laying the carbon fabric is also demonstrated. This method is quite operational, which allows it to be used within the framework of real production in order to improve the conditions and methods of production.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139372051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CONTROL SYSTEM OF THE ELECTRIC DRIVE OF THE LOOP HOLDER OF THE FINISHING GROUP OF THE HOT ROLLING MILL, WHICH IMPLEMENTS CONTROL AND FORCING OF THE ELECTRIC DRIVE MOMENT","authors":"V. Meshcheryakov, O. V. Kryukov, E. Didenko","doi":"10.14489/td.2023.06.pp.044-049","DOIUrl":"https://doi.org/10.14489/td.2023.06.pp.044-049","url":null,"abstract":"The operation of the DC electric drive of the loop holder installed on the hot rolling mill between the stands of the finishing group, which is part of the SARN with the indirect principle of metal tension control, which generates control signals based on the control of the specific tension of the strip passing between two stands, is considered. It is shown that the SARN action algorithm is based on taking into account the impact on the strip of the auxiliary mechanism – the loop holder, the frame of which must be rotated to the optimal angle. The conditions are described under which the looper is in an equilibrium state, when the moment of the electric motor balances the moment of resistance on its shaft, determined by the force arising due to the tension of the strip. It is shown that the high-speed electric drive of the looper, which is in the steady braking mode for most of the cycle time and creates a braking torque, at the moment the strip enters the interstand gap, should provide a short-term forcing of the moment for the movement of the frame, followed by a stop in the allowable zone of the angle of rotation.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139372033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF THE QUALITY OF MACHINE PARTS' MICRORELIEF BY THE METHOD OF CORRELATION-SPECTRAL ANALYSIS OF THEIR IMAGES","authors":"A. D. Abramov","doi":"10.14489/td.2023.06.pp.020-027","DOIUrl":"https://doi.org/10.14489/td.2023.06.pp.020-027","url":null,"abstract":"The article considers a method for estimating the parameters of the microrelief of the surface of machine parts by optoelectronic and computer means, as an integral part of the technological process of manufacturing machine parts with precision surfaces. The method is based on computer processing of images of the studied microreliefs, considered as a set of realizations of a stationary random process. The number of realizations of the random process is assumed to be equal to the number of lines in the analyzed microrelief image. The microrelief image is considered as a matrix of random numbers. For this matrix, mathematical expectations, variances, standard deviations, correlation moments and the normalized autocorrelation coefficient of honey are calculated for the columns of the matrix. To conduct research on the proposed method, an optical-electronic complex was used, consisting of an instrumental microscope with a video camera and a computer for digital processing of the obtained images of the microrelief f reference samples with different roughness. The surface roughness was estimated by standard methods on a profilograph and ranged from Ra = 0.025 µm to Ra = 0.130 µm. When developing software for correlation-spectral image processing, OpenCV tools and the C++ language were used. According to the research results, it was found that the nature of the correlation functions is largely determined by the parameters of the studied microreliefs. To identify the studied microreliefs, we determined the analytical dependences of the arithmetic mean deviation of the microrelief surface profile both on the average value of the variable component of the autocorrelation function and on the values of its spectral density. It has been established that for the identification of a microrelief by optical-electronic means, the most promising is the use of the spectral density of its autocorrelation function, calculated from its halftone image. The results of applying the correlation-spectral method for assessing the microrelief the working surface of an aircraft blade are presented.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139371863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"QUALITY CONTROL OF TRANSFORMER OIL BY GAS-LIQUID CHROMATOGRAPHY","authors":"M. Lyutikova, S. Korobeynikov, A. Ridel","doi":"10.14489/td.2023.06.pp.030-035","DOIUrl":"https://doi.org/10.14489/td.2023.06.pp.030-035","url":null,"abstract":"In oil-filled high-voltage equipment (power transformers, reactors, current and voltage transformers, switches and bushings), transformer oil performs a number of important functions (heat-removing, insulating, arcing, protective, information and diagnostic). With prolonged use in equipment, the oil undergoes oxidation, which leads to a deterioration in its dielectric properties. In order to slow down the process of oil oxidation and extend the life of liquid insulation, an antioxidant additive ionol (2,6-di-tert-butyl-4-methylphenol) is added to it. Using the method of chromato-mass spectrometry, it was found that ionol decomposes during its consumption with the formation of other phenolic-type compounds, which also exhibit antioxidant activity. In addition, the identified degradation products of ionol can serve as indicators of the state of the liquid insulation as a whole. However, the method of chromatomass spectrometry, for certain reasons, is not used in power grid laboratories. Therefore, in this paper, we propose a method for determining the decomposition products of ionol in their joint presence in operating oil, based on the method of gasliquid chromatography with a flame ionization detector. The implementation of this technique does not require significant investments. In addition, new boundary values of ionol have been established, which should be taken into account when planning the addition of ionol to operating oil in order to prevent a sharp deterioration in its insulating properties.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139371713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CORRECTION OF THE VECTOR CONTROL SYSTEM OF AN ASYNCHRONOUS ELECTRIC DRIVE BY MONITORING AND REGULATING THE COORDINATES OF THE STATOR CURRENT VECTOR","authors":"V. Meshcheryakov, O. Kryukov, O. Danilova","doi":"10.14489/td.2022.12.pp.054-059","DOIUrl":"https://doi.org/10.14489/td.2022.12.pp.054-059","url":null,"abstract":"An adjustable asynchronous electric drive is considered, in which the vector control system is supplemented with correction blocks acting on the magnitude of the longitudinal (magnetizing) component of the stator current vector. It is shown that it is advisable to carry out the action of the correction system with a reduced static load of the motor in steady-state mode, due to which, at fixed values of the static moment, a decrease in the stator current is ensured. A feature of the construction of the proposed corrected vector control system is the use of correction blocks that monitor the longitudinal and transverse components of the stator current, which allows you to determine the tangent of the angle between the vectors of the stator current and its longitudinal component, as well as the mismatch of the received and set values, and in the function of the mismatch value to change the signal setting the longitudinal component of the stator current. The effect and advantages of the proposed correction system of an asynchronous electric drive with vector control are investigated by simulation modeling.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129004314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CONSTRUCTION OF A MATHEMATICAL MODEL OF A DEFECT IN THE APPEARANCE OF AN INTERNAL CRACK IN A TURBINE OR PUMP BLADE","authors":"P. A. Trebunskih","doi":"10.14489/td.2022.12.pp.020-025","DOIUrl":"https://doi.org/10.14489/td.2022.12.pp.020-025","url":null,"abstract":"The appearance of a crack in the turbine or pump blade with the subsequent occurrence of vibration is considered. Dependences for determining the presence of a defect and the level of vibration are obtained, and phase portraits of vibrations based on the obtained dependences are constructed. The result of the study is the possibility of simulating the defect on relatively simple mathematical models.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125087385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GREEN ENERGY AND NON-DESTRUCTIVE TESTING","authors":"V. Matveev","doi":"10.14489/td.2022.12.pp.040-046","DOIUrl":"https://doi.org/10.14489/td.2022.12.pp.040-046","url":null,"abstract":"The article summarizes the results of the companies' achievements at the exhibition \"RENWEX – 2022\". Like any products, green energy products are subjected to tests and diagnostics to confirm their quality and reliability. The main methods and means of non-destructive testing and examples of their practical use in improving the quality of green energy products are given.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124632825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ISSUES OF IMPROVING THE MOISTURE CONTENT CRITERIA FOR THE INSULATION OF OIL-FILLED TRANSFORMERS IN THE CONTEXT OF THE DEVELOPMENT OF TECHNOLOGIES FOR ITS AUTOMATED RECOVERY","authors":"S. Vysogorets","doi":"10.14489/td.2022.12.pp.026-033","DOIUrl":"https://doi.org/10.14489/td.2022.12.pp.026-033","url":null,"abstract":"The operational reliability of oil-filled transformers largely depends on the characteristics of the insulation, which is confirmed by the failure statistics. Moisture significantly affects both the reliability and the overload capacity and durability of power transformers. Drying insulation by traditional methods is a complex and expensive job, the complexity of which depends on the size of the transformer and the percentage of paper moisture, the more, the more difficult. An equally difficult task is to reliably measure the moisture content of the paper. To improve the accuracy of diagnosing insulation in terms of oil quality, changes are proposed to the requirements for the sampling procedure of a number of standards. To improve the efficiency of service maintenance of power transformers, improved criteria for the moisture content of solid insulation are proposed. The period of the most effective use of automated insulation restoration systems of the TRANSEC type has been determined. Field tests of the TRANSEC technology were carried out in an operating electrical installation. The high efficiency of automated insulation restoration systems was established, the dependence of insulation characteristics on temperature was confirmed, the admissibility of using the indicator of relative moisture saturation to assess the dynamics of the insulation restoration process, the comparability of the results of the measured and calculated values of paper moisture at an insulation temperature of at least 40 °C.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114270190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ISSUES OF DEVELOPMENT AND OPTIMIZATION OF CUVETTE TURBIDIMETERS FOR WATER TURBIDITY CONTROL","authors":"B. R. Jabbarli, M. V. Huseynova","doi":"10.14489/td.2022.12.pp.047-051","DOIUrl":"https://doi.org/10.14489/td.2022.12.pp.047-051","url":null,"abstract":"The issues of development and optimization of cuvette turbidimeters for water turbidity control are considered. The principle of constructing a universal turbidimeter with a variable course of the liquid beam inside the cuvette is described. The problem of optimization of cuvette laser turbidimeters in the mode of the presence of a rigid coupling function between the varying value of the initial laser radiation intensity and the length of the beam path in the liquid in the cuvette is investigated. It is shown that a turbidimeter with a changing beam path in a cuvette and a changing radiation intensity can have the highest average integral sensitivity if a decrease in the beam path is accompanied by a proportional logarithmic increase in the radiation intensity.","PeriodicalId":432853,"journal":{"name":"Kontrol'. Diagnostika","volume":"96 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125591241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}