Volodymyr S. Eremenko

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” · Department of Information and Measurement Devices

The article describes the approach to the formation of a simulation model of information signals, which are typical for objects with different types of defects. The dispersive analysis of the signal spectrum components in the bases of the discrete Hartley transform and the discrete cosine transform is carried out. The analysis of the form of the re...

This chapter is devoted to the application of virtual measures in methods of standardless diagnostics of composites, which allows to simulate various types of defects or damage levels of a product without the use of physical standards, which reduces the time, technical and economic costs associated with the manufacture of reference samples. A metho...

Monitoring of air pollution using unnamed aerial systems (UAS)s is considered. The specifics and content of the information support of the measuring system using UASs are described. The mathematical model of the local atmospheric pollution field in the form of a random field is substantiated. A model of the Wiener field is considered, which describ...

The features of monitoring atmospheric air pollution are considered and a promising direction for the development of an extensive network of monitoring systems is proposed. The results of the analysis of the composition and type of pollutants during the operation of thermal power plants (TPPs) and technologically hazardous enterprises of various in...

The models and measures for measuring random angular quantities (plane angles and phase shifts of cyclic signals) are considered, the basic concepts, terms, definitions and characteristics that are used in the statistical analysis of angular data are given. The definitions and characteristics of the integral probability distribution function (PDF)...

Examples of building models and measures in monitoring and diagnostics of electric power objects are given. It is known that accuracy and reliability of results of diagnostics of technical objects depends on many factors. And, not in the last place, from qualitatively formed training sets which on different parameters and characteristics correspond...

Examples of using the developed models and measures on the circle for the study of cyclic signals in various subject areas are given. The object of study is the phase shift between cyclic signals. The limiting case of cyclic signals are periodic signals, in particular harmonious signals. The solutions to the problems of precision ultrasonic echo-pu...

The general problems of measurements and monitoring are considered, including the issues of displaying the dynamics of a physical quantity in space and time, the stability of unit’s measures of a physical quantity, spatial coordinates and time, data protection and measurement results. The system of postulates on which the theory of measurements is...

The methodological aspects of the analysis of multidimensional signals and fields are highlighted. Mathematical models of measuring signals and fields are systematized, the main spatio-temporal models of quasi-determined signals are considered—continuous and discrete, complex-valued, periodic. Some facts of the theory of orthogonal signals and orth...

The issues of using material measures to assess the results of measurement of physical quantities are considered. The concept of matching the material and probability measures with the aim of forming a unified approach to the assessment of the result and characteristics of measurement uncertainty is proposed. An example of using a set of material a...

This book examines modern methods of creating models and measures in measurements, physical and probabilistic measures, models, spaces and bases of signals and fields, deterministic and probabilistic models and measures of angular quantities. Examples of their use on a circle and in phase measurements are given; models and measures for diagnostics...

The article is devoted to the problem of the increasing of information quality for the impedance method of nondestructive testing. The purpose of this article is to get for the pulsed impedance method of nondestructive testing the additional informative parameters. Instantaneous values of the information signal's amplitude is a sensitive parameter...

Aircraft, their assemblies, and units must provide high durability and reliability, and maintain mechanical and technological characteristics throughout the life span of the aircraft. Different elements of aircraft structures work under mechanical loads, over a wide temperature range, with varying degrees of exposure to corrosive environments. Airc...

The article describes the approach to the formation of a simulation model of information signals, which are typical for objects with different types of defects. The dispersive analysis of the signal spectrum components in the bases of the discrete Hartley transform and the discrete cosine transform is carried out. The analysis of the form of the re...

In this paper, it was proposed to carry out a preliminary normalization of diagnostic parameters using the Johnson distribution, which with three basic distribution groups (SL, SB, SU), covers a wide class of empirical distributions. The mathematical description of the family allows us to find the approximating probability density function in an ex...

В даній статті представлено аналіз полігармонічних сигналів за допомогою перетворення Д. Габора. Розглянуто різновиди часових вікон і їх характеристики. Досліджено застосування часових вікон в задачі аналізу нестаціонарних сигналів, за допомогою програми, розробленої у пакеті Mathcad. Визначено переваги і недоліки перетворення Габора. In this paper...

A method for determining the oxygen concentration in the air based on the meteorological parameters of the environment is considered. Metrological parameters of this method are considered. The extended uncertainty of the method is estimated from the results of Monte-Carlo simulation. Prediction of the volume concentration of oxygen in the air was c...

It is proposed to apply the wavelet transform to localize in time the frequency components of the information signals in this article. The wavelet transform allows to fulfil time-frequency analysis of signals, which is very important for studying the structure of a composite material from the mode composition of free oscillations. The proposed appr...

The article presents methods and devices for diagnosing heat power equipment. A generalized structure of an intelligent distributed multi-level monitoring and diagnostic system for heat engineering equipment is developed, which is consistent with the principles of the Smart Grid concept. Methods for analyzing information signals in frequency-time a...

Purpose. Determination of a functional relationship between the oxygen concentration in the air and meteorological parameters (temperature, pressure, humidity) in open areas. Methodology. The functional relationship between the oxygen concentration in the air and meteorological parameters is established on the basis of experimental gas laws. Appro...

Paper depicts a prototype system for nondestructive testing of composite materials which uses two physical methods for flaw detection: low-velocity impact method and mechanical impedance analysis method. Introduced system uses neural network for processing digitized signals from the sensors and making diagnostic decisions. Paper also describes prot...

This article is devoted to software realization via NI Lab VIEW 2011 for system of the standardless diagnostic of technical objects. The solution requires methods that are fast and efficient in diagnostics, adapted for usage condition changes, oriented for wide set of objects under control and without changes in the main software structure. The str...

Distinctive line of composite materials is indivisibility of their creation process and formation of properties from reception of ready details and knots. According to this, achievement of high reliability of products from composites it is necessary to improve, first of all, manufacturing techniques and to provide the control of observance of all p...