Wyniki wyszukiwania - BazTech

1

Modeling of Acoustic Coupling of Ultrasonic Probes for High-Speed Rail Track Inspection

Mackiewicz Sławomir, Ranachowski Zbigniew, Katz Tomasz, Dębowski Tomasz, Starzyński Grzegorz, Ranachowski Przemysław

Archives of Acoustics

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2024

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Vol. 49, nr 2

255--266

EN

The paper presents the modeling of transmission of the ultrasonic plane wave through an uniform liquid layer. The considered sources of the ultrasonic wave were normal (straight) beam longitudinal wave probes and angle beam sheer waves probes commonly used in non-destructive testing. Coupling losses (CL) introduced by the presence of the coupling layer are discussed and determined applying the numerical procedure. The modeling applies to both monochromatic waves and short ultrasonic pulses with a specified frequency bandwidth. Model implementation and validation was performed using a specialized software. The predictions of the model were confirmed by coupling losses measurements for a normal beam longitudinal wave probe with a delay line made of polymethyl methacrylate (PMMA). The developed model can be useful in designing ultrasonic probes for high-speed rail track inspections, especially for establishing the optimal thickness of the water coupling layer and estimation of coupling losses, due to inevitable changes of the water gap during mobile rail inspection.

2

Ultrasonic detection of transversal cracks in rail heads – theoretical approach

Katz Tomasz, Mackiewicz Sławomir, Ranachowski Zbigniew, Kowalewski Zbigniew L., Anatolik Łukasz

Engineering Transactions

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2021

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Vol. 69, iss. 4

437--456

EN

In the paper the calculation of ultrasonic field generated by the transmitting transducer and the pulse-echo amplitude received after beam reflection at the defect in tested material is presented. The focus of the authors is directed on the specific transducer – defect configurations where the common methods of determination of ultrasonic beam trajectory fails. The developed analytical model is based on well-established principles of elastodynamic theory and forms the basis for computer program for simulation of ultrasonic examination of railway rails.

3

Ocena wyników badań złączy spawanych techniką phased array wg PN-EN ISO 19285

Kaczmarek R., Kaczmarek K.

Przegląd Spawalnictwa

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2018

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R. 90, nr 2

10--15

PL

W pracy przedstawiono sposób oceny wskazań wykrytych w badaniach złączy spawanych techniką phased array na podstawie PN-EN ISO 19285. Przedstawiono ocenę i klasyfikację wskazań bazującą na długości i wysokości, którą uzupełniono licznymi przykładami. Omówiono również ocenę bazującą na długości i amplitudzie wskazań oraz przedyskutowano zasadność stosowania tego wariantu oceny. Artykuł kierowany jest do personelu badań nieniszczących oraz personelu spawalniczego, zainteresowanego tematyką nowoczesnych technik badań ultradźwiękowych.

EN

The paper presents a method of evaluating indications detected in the studies of welded joints using the phased array technique based on PN-EN ISO 19285. The evaluation and classification of indications based on their length and height, which was supplemented with numerous examples, was presented. An assessment based on the length and amplitude of the indications was discussed and the validity of the use of this evaluation variant was discussed. The article is addressed to non-destructive testing and welding personnel interested in the subject of advanced ultrasonic testing techniques.

4

Ocena wielkości reflektora przy badaniu ultradźwiękowym techniką OWR - algorytm aplikacji. Cz.2

Cukrowski P., Pakos R.

Przegląd Spawalnictwa

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2008

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R. 80, nr 4

33-38

PL

Artykuł stanowi kontynuację artykułu zamieszczonego w numerze 2/2008 "Przeglądu Spawalnictwa". Przedstawiono algorytmy przebiegu określania wybranych parametrów w programie komputerowym oceny wielkości reflektora przy badaniu ultradźwiękowym techniką OWR i powiązania między nimi. Ponadto przedstawione zostały ekrany aplikacji z zaznaczonymi kolejnymi krokami postępowania dla prawidłowej aplikacji. Zasada charakteryzowania i przeprowadzania badań ultradźwiękowych ulegała wielu modyfikacjom. Początkowo proces ten był złożony z uwagi na zastosowanie aparatów analogowych, z czasem dzięki zastosowaniu aparatów cyfrowych stał się znacznie prostszy. Pomimo coraz powszechniejszego stosowania w praktyce przemysłowej badań ultradźwiękowych aparatury cyfrowej, szkolenia personelu odbywają się w dalszym ciągu z wykorzystaniem aparatów analogowych, dla których opracowana została, opisana w niniejszym artykule aplikacja komputerowa.

EN

The present document is a continuation of the first paper published in the Issue No. 2/2008 of "Przegląd Spawalnictwa" [Welding Technology Review]. It presents the algorithms of the procedure of definition of selected parameters within the computer application for evaluation of reflector size at ultrasonic examination by means of OWR technology, inclusive of applicable relationships. Furthermore, the article presents the application screens which display highlighted sequential steps following the correct procedure. The principles of description and performance of ultrasonic examination have received many modifications. At the beginning, the process was complex due to application of analogue equipment; as years went by, introduction of digital hardware simplified the entire procedure. In spite of increasingly popular application of digital hardware in practical industrial ultrasonic examinations, the personnel is still trained on the existing analogue equipment; the computer application described in the present article applies to the said analogue systems.

5

Examination of conditions in contact interface using ultrasonic measurement

Saiki H., Marumo Y., Ruan L., Matsukawa T., Zhan Z. H., Sakata Y.

Archives of Materials Science and Engineering

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2007

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Vol. 28, nr 2

113-118

EN

Purpose: In metal forming, the conditions of contact interface have a great effect on the characteristics of interface friction and heat transfer between tool and workpiece. Estimation of contact conditions in the toolworkpiece interface is required in order to optimize process conditions. Ultrasonic examination is an effective method to estimate the contact conditions. In this study, we investigated the effects of ultrasonic frequencies and intermediate air/lubricant films in the contact interface on the properties of penetration and reflection of incident ultrasonic waves. Design/methodology/approach: We have presented a method by which the contact conditions are evaluated from the relative intensity of reflected ultrasonic waves at the interface. Using this evaluation method, the relative intensity was measured continuously during processes. Findings: The effects of ultrasonic frequencies and intermediate films on the properties of penetration and reflection of incident ultrasonic waves were revealed. The presented method was effective for evaluating the variation of contact interface conditions. Research limitations/implications: Thickness of intermediate films can be measured using this ultrasonic examination. The performance of lubricants can be estimated. Practical implications: The optimization of forming processes will be achieved based on the evaluation results of contact conditions. Originality/value: Tribological conditions including intermediate air/lubricants were evaluated by ultrasonic examination. This shows the possibility that the lubricant behaviour in the contact interface is examined during processes.