Vibrations in engineering and technology

Borysiuk Dmytro – Candidate of Technical Sciences, Senior Lecturer of the department of automobiles and transport management of Vinnytsia National Technical University (21021, Vinnytsia, VoinovInternationalistov st., 7, room 3222, e-mail: bddv@ukr.net, https://orcid.org/0000-0001-8572-6959). 

Tverdokhlib Igor – Candidate of Technical Sciences, Associate Professor at the Department of General Technical Disciplines and Labor Protection of Vinnytsia National Agrarian University (21008, Vinniytsia, st. Sonyachna 3, VNAU, 21008, e-mail: igor_tverdokhlib@yahoo.com, https://orcid.org/0000-0003-1350-3232).

Kupchuk Ihor – Ph. D in Engeneering, Associate Professor of the Department of General Technical Disciplines and Labor Protection, Vinnytsia National Agrarian University (3, Sonychna St., Vinnytsia, 21008, Ukraine, +380978173992, kupchuk.igor@i.ua, http://orcid.org/0000-0002-2973-6914).

Kovalchuk Oleg is an engineer at "Niva" FG.

The modern stage of development and use of diagnostic tools is characterized by intensive computerization. Computer technology is used at all stages of designing diagnostic systems, but, of course, it plays the main role in the process of processing and analyzing diagnostic information.

Vibrodiagnostics is based on measuring the characteristics of vibration processes (displacement, speed or acceleration) that are formed during the interaction of parts of a working machine or mechanism, and their analysis by various methods. The vibroacoustic signal has a complex structure that depends on the dynamics of the mechanism, as well as the type and nature of the interaction of the nodes that make it up.

Acceleration is a derivative of speed and can be used to assess the tendency of a machine's technical condition to change. The change in the amount of movement (amplitude of vibration) in the frequency spectrum is used in the tasks of finding various defects.

The vibroacoustic signal has a complex structure, contains a useful component and an obstacle that prevents accurate recognition of the information contained in the signal. In addition, distortions occur when the diagnostic signal passes through the channels from the source to the sensor.

The mathematical model of the vibroacoustic signal obtained during the vibroacoustic diagnosis of machines is presented in the article. It was determined that the time function s(t) specified in the interval [0, T] serves as a mathematical representation of the signal, which will be used to consider methods of its transformation in order to highlight its parameters and diagnostic features. The ability of the signal to provide information about the state of the object is due to the fact that some of its properties can change depending on the state change. In order for the diagnostic problem to be solved, different signals must correspond to different states of the object, and this correspondence must be mutually unambiguous.

1. Burau N.I., & Marchuk P.I. (2001). Vydilennya diahnostychnykh oznak i trishchyn u lopatkakh aviatsiynykh dvyhuniv shlyakhom veyvlet-peretvorennya nestatsionarnoho akustychnoho syhnalu [Detection of diagnostic signs and cracks in the blades of aircraft engines due to wavelet-conversion of a non-stationary acoustic signal]. Fizychni metody ta zasoby kontrolyu seredovyshch materialiv ta vyrobiv - Physical methods and means of controlling the media of materials and products, 6, 219-224 [in Ukrainian].

2. Zamikhovsʹkyy L. M., & Kalyavin V. P. (2004). Osnovy teoriyi nadiynosti ta tekhnichnoyi diahnostyky [Fundamentals of the theory of reliability and technical diagnostics]. Ivano-Frankivsʹk: Polum'ya [in Ukrainian].

3. Kopiy B. V., Stefanishyn O. I., & Kopiy I. B. (2006). Analiz nadiynosti reduktoriv verstativ-kachalok [Reliability analysis of gearboxes of rocking machines]. Rozvidka ta rozrobka naftovykh ta hazovykh rodovyshch - Exploration and development of oil and gas deposits, № 4 (21), 96-99 [in Ukrainian].

4. Bandura V. V. (1999). Doslidzhennya vibrostanu hlybynno-nasosnykh shtanhovykh ustanovok [Research on the state of vibration of submersible pump rod installations]. Rozvidka ta rozrobka naftovykh ta hazovykh rodovyshch. Ser.: Metody ta zasoby tekhnichnoyi diahnostyky - Exploration and development of oil and gas fields. Ser.: Methods and means of technical diagnostics, 36 (t. 8), 301-310 [in Ukrainian].

5. Borysyuk D. V., & Yatskovsʹkyy V. I. (2013). Systemy vymiryuvannya ta analizu vibratsiyi, udaru ta shumu [Measurement and analysis systems of vibration, impact and noise]. Vybratsiyi u tekhnitsi ta tekhnolohiyakh - Vibrations in engineering and technology, 4 (72), 5-12 [in Ukrainian].

6. Borysyuk D. V., Spirin O. V., Tverdokhlib I. V., & Hunʹko I. V. (2017). Metodyka vyznachennya mistsya vstanovlennya akselerometriv pry vibroakustychnomu diahnostuvanni kerovanykh mostiv kolisnykh silʹsʹkohospodarsʹkykh traktoriv [The method of determining the place of installation of accelerometers during vibroacoustic diagnosis of steerable bridges of wheeled agricultural tractors]. Podilʹsʹkyy visnyk: silʹsʹke hospodarstvo, tekhnika, ekonomika - Podilsky Visnyk: agriculture, technology, economy, 27, 112-119 [in Ukrainian].

7. Borysyuk D. V., Spirin O. V., Tverdokhlib I. V., & Hunʹko I. V. (2017). Vybroakustychne diahnostuvannya kerovanykh mostiv kolisnykh silʹsʹkohospodarsʹkykh traktoriv [Vibroacoustic diagnostics of steered axles of wheeled agricultural tractors]. Silʹsʹkohospodarsʹki mashyny - Agricultural machinery, 37, 6-16 [in Ukrainian].

8. Bilichenko V. V., Romanyuk O. M., Yatskovsʹkyy V. I., & Borysyuk D. V. (2017). Montazh akselerometriv pry vybroakustychnomu diahnostuvanni mashyn ta mekhanizmiv [Installation of accelerometers for vibroacoustic diagnosis of machines and mechanisms]. Tekhnika, enerhetyka, transport APK - Technology, energy, transport of agricultural industry, 2 (97), 52-55 [in Ukrainian].

9. Yatskovsʹkyy V. I., Borysyuk D. V., Romanyuk O. M., & Bilichenko V. V. (2017). Analoho-tsyfrove peretvorennya vibroakustychnykh syhnaliv [Analog-digital conversion of vibroacoustic signals]. Vybratsiyi u tekhnitsi ta tekhnolohiyakh - Vibrations in engineering and technology, 2 (85), 78-80 [in Ukrainian].