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consists in the development of a non-destructive diagnostic method that allows for

assessing the state of ferromagnetic structural elements and industrial structures by

means of the parameters of the MAE signal is solved. This method efficiently works

under real long-term exploitation and without the need of any additional load, the need

to stop working or changing the operating mode of the element which is under control.

The results of theoretical studies of the structure and statistical properties of the

MAE signals and approaches for their selection and processing are underlain at

modernization and brought to practical use of magnetoacoustic information-measuring

system.
The results obtained in this work form the basis for the development of the method

for diagnostic of the stress state of ferromagnetic materials, which allowsfor determi-

ning of residual stress zones when diagnosing long-term exploited pipe steels and in

practice ensuring an error less than 11%.

The research results areintroduced for MAE-diagnostics of long-term exploitation

facilities at “Main pipelines “Druzhba”, a branch of PJSC “Ukrtransnafta” and at

“PRIKARPATTRANSGAS Gas Pipeline Management”.

Keywords: ferromagnetic material, domain wall, magnetic field, magnetoelastic

acoustic emission, mathematical model, information parameters of the signal,

evaluation algorithms, diagnostic method, stress state.

Список опублікованих праць за темою дисертації:

Наукові праці, в яких опубліковані основні наукові результати дисертації:

1. Skal’s’kyi V. R., Pochaps’kyi E. P., Mel’nyk N. P. Modeling of motion of the

domain walls in ferromagnetic materials (A survey). Materials Science. 2016. Vol. 51.

No 6. P. 753–764. (Web of Science, Scopus).

2. Почапський Є. П., Мельник Н. П. Оцінювання переміщень доменної стінки

у феромагнетних матеріалах за дії зовнішнього магнетного поля. Вісник

Тернопільського національного університету. 2015. № 3. С. 102–109.

3. Pochaps’kyi E. P., Mel’nyk N. P., Koblan І. М. Influence of the conditions of

excitation and generation of magnetoelastic acoustic emission signals in ferromagnetic