АСНК - Library

Khodnevych S. Research of eddy-current flow detotors based on frequency synthesizers

This master's thesis consists of 85 pages, 50 illustrations, 35 stamps and 24 literary references.

In this dissertation features of the use of orthogonal methods of measuring signal parameters during the design of eddy-current flaw detectors based on microcontrollers are considered. The author analyzes the new structure of a flaw detector, which consists of one measuring channel, and implements an orthogonal measurement method, has very low power consumption, small dimensions and corresponding cost. Experimental investigations of the proposed structure of the eddy current flaw detector on a special experimental model were carried out, where simulation of possible defects that could result both in phase change and amplitude of the measurement signal with the help of the high-precision synthesizer of signals SDG102, firm SIGLENT was carried out, which confirmed the high metrological capabilities of this structure.

: 17 May 2018; Hits: 941

Redka M. Development of information technology of ultrasonic flow detection with increased relability

Topicality of research

Appearance of new materials, which main purpose is increment of strength and reliability of products without high material costs causes necessity of improvement of existing and development of new non-destructive testing (NDT) methods. Method TOFD is one of such methods. Signals, received in result of diffractions has low amplitude, and it requires using of special methods of signal detection and processing.

New materials, as example – composite, has specific characteristics, one of this characteristics is high attenuation of sound. Development of efficient methods of control for these materials also requires using of improved methods of detecting and processing of signals with low signal-to-noise ratio (SNR).

: 17 May 2018; Hits: 1206

Pohrebenko D. Methods and means for rehabilitation of the ankle joint

The master's dissertation consists of the introduction and 5 chapters, the conclusion and the list of used literature. The full volume is 73 pages, including 41 illustrations, 22 tables and 19 literary sources.

The urgency of this topic is that the number of people in need of rehabilitation has increased significantly in recent times in connection with the ATO in eastern Ukraine. Known foreign devices for passive restoration of the ankle joint, but their main disadvantage is the high price, and in our country the goods of this profile are not produced, so of this many people who need rehab can not afford expensive equipment. Known patents for active rehabilitation of the ankle joint, but their main disadvantage is that they are not suitable for the restoration of immobilized extremities. Therefore, it is proposed to create a rehabilitation device using a servo drive as a source of motion. The main advantage should be the price, due to the use of cheaper serial components.

The purpose of this research is to develop a rehabilitation device designed for forced reproduction of plantar foot flexion/dorsiflexion and abduction/adduction. Creating a control program is the second stage of the study.

: 17 May 2018; Hits: 1177

Shynderuk T. Research of correlation method for acoustic signals location

The correlation method of locations acoustic signals have been researched in this master work.
Master work consists of 82 pages, which includes 57 figures, 1 table, 49 references, 2 attachments.
Keywords: mutual correlation function, acoustic wave, shot recording, the signals source.
Main object of this master work is the spreading process of acoustic waves from a shot. The subject of research is the methods and means of increasing the sensitivity of determining the coordinates from impulse noise sources.
Master work consists of an introduction, eight chapters and a conclusion.
Main goals and objectives of development have been described in introduction. The first section devoted to the basic methods of determining the coordinates of signal sources, to considering the existing devices and the development of the block diagram. The second section describes the relevance of research. The third section is devoted to the methods and approaches to detection and recognition of different types audio. The fourth section is devoted to device settlement. The fifth section is devoted to the development of structural and functional diagrams, time diagrams and operation algorithm. In the sixth section performed simulation of calculation delay using mutual correlation function. The seventh section is devoted to the selection of components. The eighth chapter is devoted to errors calculation.
Results of research and the basic opportunities for further research have been presented in conclusion.

Research advisor: prof. Bazhenov V.

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: 28 July 2017; Hits: 1083

Ukrainets S. Acoustic testing technology using GSM

In this master work the possibility of іmplementation GSM standard to nondestructive testing has been examined, which enables to easily adapt to new control objects and different types of problems.
Possible methods of nondestructive testing have been presented and reasonable ultrasonic NDT method has been chosen. Basic types of wireless data transmition and their advantages and disadvantages have been discribed .
Functional scheme have been described and developed. Timing diagrams and working proces of flaw have been showed. The calculation of piezoelectric transducer has been done. The results of these calculations determine basic sensor geometric parameters, resolution and thickness of antireflaction layer.
Device schematic diagram and parameters of basic blocks have been designed. The system meets all the requirements. Parts of the electrical circuit, comparative data analysis have been made.
Type of wireless data transmition has been chosen and an experimental GSM-module has been described.

Key words: automation control, ultrasound wireless system, wireless flaw technologies.

Research advisor: prof. Petrik V.