Pub Date : 2022-01-01DOI: 10.32684/2412-5288-2022-1-20-44-51
V. Solodka, O. V. Tymoshevskyi
In this work, an analysis is carried out using spectral transformations to obtain compression indicators and signal-to-noise ratio, the best wavelet basis, namely, a special case of the Fourier transform for image compression according to the signal-to-noise ratio criteria. The increase in the compression ratio with increasing Dobeshi order is shown due to the fact that increasing the order increases the scaling function, which allows to increase the degree of compression of the image, obtaining a satisfactory quality of this image. But with increasing scaling function, the length of the filter increases, which complicates the implementation of this method. Spectral transformations in the problems of image compression in modern algorithms are shown that they can increase the compression ratio of black and white and color images with a comparative visual quality in relation to the algorithms of the previous generation, based on discrete cosine transform. Also, the design of a mesh volumetric object in two-dimensional coordinates is carried out to remove invisible vertices and segments. A study of the transfer of the remainder in the two-dimensional field of vertices during alternation and sequential television scans. It is shown that in order to reduce the data flow, it is advisable to perform a spectral wavelet transform before transforming a three-dimensional grid image into a two-dimensional one. By removing insignificant values of the wavelet coefficients, it is possible to achieve compression by a factor of 5, while the image quality represented by the signal-to-noise ratio reaches 35 dB – an estimate of the indicator of acceptable visual quality for comfortable viewing.
在这项工作中，使用频谱变换进行分析，以获得压缩指标和信噪比，最佳的小波基，即傅里叶变换根据信噪比标准进行图像压缩的特殊情况。压缩比随着Dobeshi阶数的增加而增加，这是因为增加阶数会增加缩放函数，从而可以增加图像的压缩程度，从而获得令人满意的图像质量。但随着尺度函数的增大，滤波器的长度也随之增大，使该方法的实现变得复杂。现代算法中图像压缩问题中的光谱变换表明，与上一代基于离散余弦变换的算法相比，它们可以提高具有比较视觉质量的黑白和彩色图像的压缩比。在二维坐标下进行网格体体对象的设计，去除不可见的顶点和段。交替和连续电视扫描中二维顶点场中余数转移的研究。结果表明，为了减少数据流，在将三维网格图像转换为二维网格图像之前，最好先进行频谱小波变换。通过去除小波系数的不重要值，可以实现5倍的压缩，而信噪比表示的图像质量达到35 dB -这是可接受的视觉质量指标的估计。
{"title":"ANALYSIS OF WAVELET TRANSFORMATION METHODS IN IMAGE COMPRESSION PROBLEMS","authors":"V. Solodka, O. V. Tymoshevskyi","doi":"10.32684/2412-5288-2022-1-20-44-51","DOIUrl":"https://doi.org/10.32684/2412-5288-2022-1-20-44-51","url":null,"abstract":"In this work, an analysis is carried out using spectral transformations to obtain compression indicators and signal-to-noise ratio, the best wavelet basis, namely, a special case of the Fourier transform for image compression according to the signal-to-noise ratio criteria. The increase in the compression ratio with increasing Dobeshi order is shown due to the fact that increasing the order increases the scaling function, which allows to increase the degree of compression of the image, obtaining a satisfactory quality of this image. But with increasing scaling function, the length of the filter increases, which complicates the implementation of this method. Spectral transformations in the problems of image compression in modern algorithms are shown that they can increase the compression ratio of black and white and color images with a comparative visual quality in relation to the algorithms of the previous generation, based on discrete cosine transform. Also, the design of a mesh volumetric object in two-dimensional coordinates is carried out to remove invisible vertices and segments. A study of the transfer of the remainder in the two-dimensional field of vertices during alternation and sequential television scans. It is shown that in order to reduce the data flow, it is advisable to perform a spectral wavelet transform before transforming a three-dimensional grid image into a two-dimensional one. By removing insignificant values of the wavelet coefficients, it is possible to achieve compression by a factor of 5, while the image quality represented by the signal-to-noise ratio reaches 35 dB – an estimate of the indicator of acceptable visual quality for comfortable viewing.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122732520","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2019-1-14-6-11
О. M. Velychko, O. Hrabovskiy, T. Gordiyenko
{"title":"FEATURES OF APPLICATION OF V-MODEL IN DEVELOPMENT AND ESTIMATION OF MEASURING INSTRUMENTS SOFTWARE","authors":"О. M. Velychko, O. Hrabovskiy, T. Gordiyenko","doi":"10.32684/2412-5288-2019-1-14-6-11","DOIUrl":"https://doi.org/10.32684/2412-5288-2019-1-14-6-11","url":null,"abstract":"","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128728480","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2022-2-21-34-41
S. Hutyria, V. V. Vovk
The article deals with the issues of parametric failures of the mechanisms of the parallel structure of robotic machines. The variety of functions performed by robots has led to the creation of machine tools with mechanisms of a parallel structure. The basis for creating a line of robotic machines with three telescopic rods is the structure of a tripod with a vertical stand of constant length, hinged to the bed and the center of the movable platform. The central passive kinematic chain blocks the scrolling of the movable platform with the executive body around its own axis, perceives workloads and gives the mechanism a kinematic certainty. For modern technical means, consisting of many interacting mechanisms, apparatuses and devices, the failure of at least one critical element of a complex system without redundancy can lead to disruption of the entire system. According to the operation of typical designs of tripod-type robots, the distribution of element failures was established and it was found that the “weak elements” are hydraulic drive seals that cause leakage. Insufficient equipment reliability leads to huge repair costs, equipment downtime, failure to perform critical tasks, sometimes to accidents associated with large economic losses, destruction of large facilities and human casualties. At the stage of industrial production of technological equipment, the reliability of robotic machines is of paramount importance. To optimize the level of reliability of the tricep subsystem, a method of rational distribution of the reliability of elements is proposed. The modeling of the phenomena of kinematic locking of the parallel structure mechanism is carried out and the corresponding criterion of parametric failures is proposed. For a robot-machine with mechanisms of a parallel structure, which has three parallel mechanisms for the translational movement of rods, three subsystems are identified and a method for rational distribution of reliability between such subsystems is proposed. An algorithm for the structural synthesis of the reliability of mechanisms of a parallel structure of the tricep type has been developed and practical recommendations have been developed for the optimal distribution of reliability standards between the subsystems of a robot-machine at the design stage.
{"title":"PARAMETRIC FAILURES AND RATIONAL ALLOCATION RELIABILITY OF ROBOT MACHINE SUBSYSTEMS","authors":"S. Hutyria, V. V. Vovk","doi":"10.32684/2412-5288-2022-2-21-34-41","DOIUrl":"https://doi.org/10.32684/2412-5288-2022-2-21-34-41","url":null,"abstract":"The article deals with the issues of parametric failures of the mechanisms of the parallel structure of robotic machines. The variety of functions performed by robots has led to the creation of machine tools with mechanisms of a parallel structure. The basis for creating a line of robotic machines with three telescopic rods is the structure of a tripod with a vertical stand of constant length, hinged to the bed and the center of the movable platform. The central passive kinematic chain blocks the scrolling of the movable platform with the executive body around its own axis, perceives workloads and gives the mechanism a kinematic certainty. For modern technical means, consisting of many interacting mechanisms, apparatuses and devices, the failure of at least one critical element of a complex system without redundancy can lead to disruption of the entire system. According to the operation of typical designs of tripod-type robots, the distribution of element failures was established and it was found that the “weak elements” are hydraulic drive seals that cause leakage. Insufficient equipment reliability leads to huge repair costs, equipment downtime, failure to perform critical tasks, sometimes to accidents associated with large economic losses, destruction of large facilities and human casualties. At the stage of industrial production of technological equipment, the reliability of robotic machines is of paramount importance. To optimize the level of reliability of the tricep subsystem, a method of rational distribution of the reliability of elements is proposed. The modeling of the phenomena of kinematic locking of the parallel structure mechanism is carried out and the corresponding criterion of parametric failures is proposed. For a robot-machine with mechanisms of a parallel structure, which has three parallel mechanisms for the translational movement of rods, three subsystems are identified and a method for rational distribution of reliability between such subsystems is proposed. An algorithm for the structural synthesis of the reliability of mechanisms of a parallel structure of the tricep type has been developed and practical recommendations have been developed for the optimal distribution of reliability standards between the subsystems of a robot-machine at the design stage.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117120957","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2022-1-20-6-15
I. Moshchenko, O. Nikitenko, Yu. V. Kozlov
The relevance of developing software tools based on traditional quality control methods for analyzing and visualizing the statistical information during the implementation of the PDCA cycle was shown. Guidelines for the use of statistical quality control tools contained in ISO international standards was presented. The quality control tools were analyzed in terms of the obtained statistical results features and the needs for their visual interpretation. The advantages and disadvantages of Сomputer algebra system (CAS) Maple, Matlab, MathCad, Mathematica are given in terms of the availability of random data processing and qualitative statistical results visualization. Based on the analysis of statistical data obtained by quality control tools, it has been proved that it is possible to most effectively solve the task using CAS Maple and the LaTeX publishing system combination. At every stage of the PDCA cycle the software modules for seven basic quality tools were realized using the CAS Maple and the LaTeX publishing system. The computational experiment results were presented. The parameters for the computational experiment results visualization of the using the LaTeX publishing system for their presentation as a single document in the cross-platform PDF format have been determined. A complex model for processing and visualizing statistical information in the PDCA cycle using the CAS Maple and LaTeX system has been developed. The model takes into account the peculiarities of input statistical information and visual interpretation of each basic quality tool. The model allows getting a single file in PDF format at the output. This PDF file contains a complex analysis of the technological process quality in a form that is simple for visual perception. Using the comparative analysis method, an expert map was compiled, that analyzed the advantages and disadvantages of each quality control tool. General recommendations were given on the use of the developed modules during the realization of the PDCA cycle in practice in the process of quality control in production and in the educational process of the engineering students.
{"title":"QUALITY CONTROL TOOLS VISUALIZATION IN THE PDCA CYCLE BY MEANS OF INFORMATION AND COMMUNICATION TECHNOLOGIES","authors":"I. Moshchenko, O. Nikitenko, Yu. V. Kozlov","doi":"10.32684/2412-5288-2022-1-20-6-15","DOIUrl":"https://doi.org/10.32684/2412-5288-2022-1-20-6-15","url":null,"abstract":"The relevance of developing software tools based on traditional quality control methods for analyzing and visualizing the statistical information during the implementation of the PDCA cycle was shown. Guidelines for the use of statistical quality control tools contained in ISO international standards was presented. The quality control tools were analyzed in terms of the obtained statistical results features and the needs for their visual interpretation. The advantages and disadvantages of Сomputer algebra system (CAS) Maple, Matlab, MathCad, Mathematica are given in terms of the availability of random data processing and qualitative statistical results visualization. Based on the analysis of statistical data obtained by quality control tools, it has been proved that it is possible to most effectively solve the task using CAS Maple and the LaTeX publishing system combination. At every stage of the PDCA cycle the software modules for seven basic quality tools were realized using the CAS Maple and the LaTeX publishing system. The computational experiment results were presented. The parameters for the computational experiment results visualization of the using the LaTeX publishing system for their presentation as a single document in the cross-platform PDF format have been determined. A complex model for processing and visualizing statistical information in the PDCA cycle using the CAS Maple and LaTeX system has been developed. The model takes into account the peculiarities of input statistical information and visual interpretation of each basic quality tool. The model allows getting a single file in PDF format at the output. This PDF file contains a complex analysis of the technological process quality in a form that is simple for visual perception. Using the comparative analysis method, an expert map was compiled, that analyzed the advantages and disadvantages of each quality control tool. General recommendations were given on the use of the developed modules during the realization of the PDCA cycle in practice in the process of quality control in production and in the educational process of the engineering students.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130564293","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2021-2-19-31-37
L. Kolomiets, V. Khamray, O. Lymarenko, A. Bazhanova, A. Ponomarenko
The paper considers a method for developing a formula that allows one to determine the relationship between the geometric and kinematic parameters of a double-wishbone suspension of a car on its roll angle when cornering. The method for determining the formula is described in detail. Test verification models were built in the computer-aided design system to verify the results obtained. For the first time, mathematical dependencies were derived to determine the change in the roll angles of the car depending on the geometric parameters of the suspension, and the basic parameters of the car's movement. Calculations of the dependencies between the coordinates of the points of attachment of the suspension arms to the frame and the steering knuckle, respectively, on the roll angle of the car in the corner have been performed.
{"title":"DEVELOPMENT OF A FORMULA OF DEPENDENCE BETWEEN VEHICLE GEOMETRIC PARAMETERS AND DYNAMIC CHARACTERISTICS","authors":"L. Kolomiets, V. Khamray, O. Lymarenko, A. Bazhanova, A. Ponomarenko","doi":"10.32684/2412-5288-2021-2-19-31-37","DOIUrl":"https://doi.org/10.32684/2412-5288-2021-2-19-31-37","url":null,"abstract":"The paper considers a method for developing a formula that allows one to determine the relationship between the geometric and kinematic parameters of a double-wishbone suspension of a car on its roll angle when cornering. The method for determining the formula is described in detail. Test verification models were built in the computer-aided design system to verify the results obtained. For the first time, mathematical dependencies were derived to determine the change in the roll angles of the car depending on the geometric parameters of the suspension, and the basic parameters of the car's movement. Calculations of the dependencies between the coordinates of the points of attachment of the suspension arms to the frame and the steering knuckle, respectively, on the roll angle of the car in the corner have been performed.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114353392","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2019-1-14-47-58
L. Kolomiets, O. Lymarenko, A. Lymarenko, E. M. Iatsynyuk
{"title":"SUBSTANTIATION OF COMPUTER MODELING OF ORTHOPEDIC CONSTRUCTIONS","authors":"L. Kolomiets, O. Lymarenko, A. Lymarenko, E. M. Iatsynyuk","doi":"10.32684/2412-5288-2019-1-14-47-58","DOIUrl":"https://doi.org/10.32684/2412-5288-2019-1-14-47-58","url":null,"abstract":"","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115260492","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2022-1-20-17-28
O. Bezvesilna, L. Kolomiets, Mariia Hrynevych, T.K. Tolochko
The relevance of aviation gravimetric measurements is shown. Advantages and disadvantages of known gravimeters are determined. The purpose of the work is to highlight the methods and means of increasing the accuracy and speed of the aviation gravimetric system. Tasks of the article: to provide the equations of motion and a list of the main components of the system; justify the choice of the natural frequency of the gravimeter oscillations; show the expediency of using the two-channel method to build a gravimeter; conduct an analysis of methodical errors; show the importance of taking into account the correction due to the influence of the angular velocity of the Earth's rotation; to propose and investigate a new transformer gravimeter of greater accuracy than the known ones. The equations of motion and a list of the main components of the aviation gravimetric system are given. It is substantiated that the selection of the gravimeter's own frequency equal to 0.1 s-1 ensures the absence of the influence of the largest disturbances (vertical acceleration and other accelerations whose frequency is greater than 0.1 s-1) on the operation of the gravimeter and the absence of the need to use additional electronic filters. The expediency of using the two-channel method for the construction of a gravimeter is shown, because this method allows you to compensate for residual instrumental errors. Methodological errors of the measuring system were analyzed. The importance of taking into account the correction due to the influence of the angular velocity of the Earth's rotation is substantiated. To take it into account, it is necessary to make a corresponding correction in the equation of motion of the aviation gravimetric system. The final equation of the measuring system with this correction was obtained. It is substantiated that the use of a new two-channel transformer gravimeter provides the necessary increase in accuracy. The methodical and instrumental errors of the system were analyzed. The accuracy requirements for the components of the measuring system are formulated.
{"title":"AVIATION GRAVIMETRIC SYSTEM WITH TRANSFORMER GRAVIMETER","authors":"O. Bezvesilna, L. Kolomiets, Mariia Hrynevych, T.K. Tolochko","doi":"10.32684/2412-5288-2022-1-20-17-28","DOIUrl":"https://doi.org/10.32684/2412-5288-2022-1-20-17-28","url":null,"abstract":"The relevance of aviation gravimetric measurements is shown. Advantages and disadvantages of known gravimeters are determined. The purpose of the work is to highlight the methods and means of increasing the accuracy and speed of the aviation gravimetric system. Tasks of the article: to provide the equations of motion and a list of the main components of the system; justify the choice of the natural frequency of the gravimeter oscillations; show the expediency of using the two-channel method to build a gravimeter; conduct an analysis of methodical errors; show the importance of taking into account the correction due to the influence of the angular velocity of the Earth's rotation; to propose and investigate a new transformer gravimeter of greater accuracy than the known ones. The equations of motion and a list of the main components of the aviation gravimetric system are given. It is substantiated that the selection of the gravimeter's own frequency equal to 0.1 s-1 ensures the absence of the influence of the largest disturbances (vertical acceleration and other accelerations whose frequency is greater than 0.1 s-1) on the operation of the gravimeter and the absence of the need to use additional electronic filters. The expediency of using the two-channel method for the construction of a gravimeter is shown, because this method allows you to compensate for residual instrumental errors. Methodological errors of the measuring system were analyzed. The importance of taking into account the correction due to the influence of the angular velocity of the Earth's rotation is substantiated. To take it into account, it is necessary to make a corresponding correction in the equation of motion of the aviation gravimetric system. The final equation of the measuring system with this correction was obtained. It is substantiated that the use of a new two-channel transformer gravimeter provides the necessary increase in accuracy. The methodical and instrumental errors of the system were analyzed. The accuracy requirements for the components of the measuring system are formulated.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130016080","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2021-2-19-17-29
L. Kolomiets, А. Tsymbalyuk, D. Tsymbalyuk
The article shows that the improvement of technological processes of metallurgical production, which aims to improve the quality of metal structures, increase the yield of suitable product, stabilize its parameters, is not possible without a balanced accounting system of raw materials, semi-finished products and other cargo in all areas. In the conditions of fast-moving processes of mass continuous production with an extensive network of cargo flows, electronic-tensometric weighing complexes are becoming more and more common, which make it possible to fully automate the process of technological weighing, ensuring documented registration of its results, increasing the objectivity of weight information. The analysis of design features of lifting mechanisms of cranes became the basis for the development of proposals for the installation of the load-receiving unit of crane scales for automatic determination of the mass of liquid cast iron in the pouring-bucket section of the foundry shop. Based on the developed methodology and calculations of the parameters of the pressure base plates of the load-receiving unit, recommendations for optimizing the design of the plates, locations and number of sensors are issued. The data obtained as a result of the calculations and experimental studies confirm the validity of the hypothesis, which was the basis of the method of calculating the slab of the load-receiving unit, which was that the calculation of slabs in the form of a beam on two hinged supports in the same plane does not reproduce the real process of slab bending in the space that passes as a result of the loading of the load-receiving unit in the built-in crane scales. The aim of the work is to develop a new method for calculating the load bearing plates of crane scales, thanks to which it will be possible to determine the parameters of the stress-strain state of the load bearing plate under the influence of the main types of mechanical loads that affect the design of the weighing device in operation, which will lead to a decrease in the mass measurement error and thereby will optimize the cost of related materials in foundry technology and improve the quality of the final product.
{"title":"METHOD OF CALCULATING THE PARAMETERS OF THE STRESSED AND DEFORMED STATE OF CRANE SCALE PLATES","authors":"L. Kolomiets, А. Tsymbalyuk, D. Tsymbalyuk","doi":"10.32684/2412-5288-2021-2-19-17-29","DOIUrl":"https://doi.org/10.32684/2412-5288-2021-2-19-17-29","url":null,"abstract":"The article shows that the improvement of technological processes of metallurgical production, which aims to improve the quality of metal structures, increase the yield of suitable product, stabilize its parameters, is not possible without a balanced accounting system of raw materials, semi-finished products and other cargo in all areas. In the conditions of fast-moving processes of mass continuous production with an extensive network of cargo flows, electronic-tensometric weighing complexes are becoming more and more common, which make it possible to fully automate the process of technological weighing, ensuring documented registration of its results, increasing the objectivity of weight information. The analysis of design features of lifting mechanisms of cranes became the basis for the development of proposals for the installation of the load-receiving unit of crane scales for automatic determination of the mass of liquid cast iron in the pouring-bucket section of the foundry shop. Based on the developed methodology and calculations of the parameters of the pressure base plates of the load-receiving unit, recommendations for optimizing the design of the plates, locations and number of sensors are issued. The data obtained as a result of the calculations and experimental studies confirm the validity of the hypothesis, which was the basis of the method of calculating the slab of the load-receiving unit, which was that the calculation of slabs in the form of a beam on two hinged supports in the same plane does not reproduce the real process of slab bending in the space that passes as a result of the loading of the load-receiving unit in the built-in crane scales. The aim of the work is to develop a new method for calculating the load bearing plates of crane scales, thanks to which it will be possible to determine the parameters of the stress-strain state of the load bearing plate under the influence of the main types of mechanical loads that affect the design of the weighing device in operation, which will lead to a decrease in the mass measurement error and thereby will optimize the cost of related materials in foundry technology and improve the quality of the final product.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122548005","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2021-2-19-48-62
H. Bratchenko, М. O. Koptielov, H. H. Smahliuk, M. Martynov
Measurements of instantaneous frequencies and phases of non-stationary components of the multicomponent signals are actual in processing medical, radar, sonar, seismic, vibration, and speech signals. When we measure the parameters of multi-component non-stationary signals, it is a need to measure the instantaneous frequency and current phase of several non-stationary frequency-modulated signal components. In this article, estimates of the measurement accuracy of the specified parameters of the non-stationary signal components were obtained using the method of simulation modeling. Measurement methods based on the short-time Fourier transform and the proposed method with local adaptive matching filtering of signal components in the frequency domain in the time-sliding observation window were studied. Adjustment of matched filters is performed separately for each component of the signal, returning to the time domain and taking into account the filter settings in the previous time window. The simulation method is used for the signal model consisting of three components. The first two components are the frequency modulated harmonic ones and the last is harmonic with constant frequency. The amplitudes of components and additive Gaussian noise variance were variated to study the influence of signal-to-noise ratio on the accuracy of measurements. Estimates of the experimental standard deviation of instantaneous frequencies and current phase measurements were obtained by comparing them with their known dependencies. The frequency laws of non-stationary signal components were chosen to be harmonic, which also allowed us to evaluate the influence of the nonlinearity of the instantaneous frequency change on the measurement accuracy. The results of differential phase measurements between two measurement channels are obtained to illustrate the quality of such ones for multi-component non-stationary signals situations. The results of this study may be useful for the development of imaging methods in inverse synthetic aperture radars (ISAR) and interferometric ISAR.
{"title":"ACCURACY ESTIMATION OF MEASURING THE INSTANTANEOUS FREQUENCIES AND PHASES OF COMPONENTS OF THE MULTICOMPONENT NON-STATIONARY SIGNAL","authors":"H. Bratchenko, М. O. Koptielov, H. H. Smahliuk, M. Martynov","doi":"10.32684/2412-5288-2021-2-19-48-62","DOIUrl":"https://doi.org/10.32684/2412-5288-2021-2-19-48-62","url":null,"abstract":"Measurements of instantaneous frequencies and phases of non-stationary components of the multicomponent signals are actual in processing medical, radar, sonar, seismic, vibration, and speech signals. When we measure the parameters of multi-component non-stationary signals, it is a need to measure the instantaneous frequency and current phase of several non-stationary frequency-modulated signal components. In this article, estimates of the measurement accuracy of the specified parameters of the non-stationary signal components were obtained using the method of simulation modeling. Measurement methods based on the short-time Fourier transform and the proposed method with local adaptive matching filtering of signal components in the frequency domain in the time-sliding observation window were studied. Adjustment of matched filters is performed separately for each component of the signal, returning to the time domain and taking into account the filter settings in the previous time window. The simulation method is used for the signal model consisting of three components. The first two components are the frequency modulated harmonic ones and the last is harmonic with constant frequency. The amplitudes of components and additive Gaussian noise variance were variated to study the influence of signal-to-noise ratio on the accuracy of measurements. Estimates of the experimental standard deviation of instantaneous frequencies and current phase measurements were obtained by comparing them with their known dependencies. The frequency laws of non-stationary signal components were chosen to be harmonic, which also allowed us to evaluate the influence of the nonlinearity of the instantaneous frequency change on the measurement accuracy. The results of differential phase measurements between two measurement channels are obtained to illustrate the quality of such ones for multi-component non-stationary signals situations. The results of this study may be useful for the development of imaging methods in inverse synthetic aperture radars (ISAR) and interferometric ISAR.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122238013","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}
Pub Date : 1900-01-01DOI: 10.32684/2412-5288-2022-2-21-14-19
M. Kataieva, D. Kvashuk
The article analyzes the influence of different types of probe geometry of a scanning probe microscope (SPM) on the features of measuring the surface topography of a nano-object. Based on the analysis, it was determined that the main drawback inherent in all modes of scanning probe microscopy is the finite size of the measuring probe tip, which cannot reach certain areas of the measuring surface during scanning, which is caused by the geometric characteristics of the probe shape. This leads to a significant deterioration of the spatial resolution and significant distortions in the SPM images when scanning surfaces with large unevenness of the ratio between the typical vertical and horizontal dimensions. Based on the conducted research, the methods of restoration of SPM images are proposed, which are built on mathematical and computer processing of SPM data, which takes into account the specific shape of the probe tip and allows improving the metrological characteristics of the measurement information. It is proved that the SPM image and the experimentally obtained shape of the tip are two-dimensional arrays of discrete values, for which the derivative is an incorrectly determined value. It is recommended that instead of deriving discrete functions during the numerical deconvolution of SPM images, during scanning with a constant average height, use the requirement for the minimum distance of the tip to the surface. It has been proven that the most effective way of digital correction of the surface topography is numerical deconvolution using the tip image obtained experimentally by scanning test structures with a well-known topography and subsequent computer processing of the data. A method of partial restoration of the topography is proposed, which is characterized by flexibility to the set metrological tasks and is aimed at increasing the speed of computing operations while ensuring the necessary accuracy of measurement information.
{"title":"METHODS OF INCREASING THE ACCURACY OF MEASUREMENT WITH A SCANNING PROBE MICROSCOPE DEPENDING ON THE GEOMETRY OF THE PROBE","authors":"M. Kataieva, D. Kvashuk","doi":"10.32684/2412-5288-2022-2-21-14-19","DOIUrl":"https://doi.org/10.32684/2412-5288-2022-2-21-14-19","url":null,"abstract":"The article analyzes the influence of different types of probe geometry of a scanning probe microscope (SPM) on the features of measuring the surface topography of a nano-object. Based on the analysis, it was determined that the main drawback inherent in all modes of scanning probe microscopy is the finite size of the measuring probe tip, which cannot reach certain areas of the measuring surface during scanning, which is caused by the geometric characteristics of the probe shape. This leads to a significant deterioration of the spatial resolution and significant distortions in the SPM images when scanning surfaces with large unevenness of the ratio between the typical vertical and horizontal dimensions. Based on the conducted research, the methods of restoration of SPM images are proposed, which are built on mathematical and computer processing of SPM data, which takes into account the specific shape of the probe tip and allows improving the metrological characteristics of the measurement information. It is proved that the SPM image and the experimentally obtained shape of the tip are two-dimensional arrays of discrete values, for which the derivative is an incorrectly determined value. It is recommended that instead of deriving discrete functions during the numerical deconvolution of SPM images, during scanning with a constant average height, use the requirement for the minimum distance of the tip to the surface. It has been proven that the most effective way of digital correction of the surface topography is numerical deconvolution using the tip image obtained experimentally by scanning test structures with a well-known topography and subsequent computer processing of the data. A method of partial restoration of the topography is proposed, which is characterized by flexibility to the set metrological tasks and is aimed at increasing the speed of computing operations while ensuring the necessary accuracy of measurement information.","PeriodicalId":104365,"journal":{"name":"Key title: Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130814266","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}
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