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Theoretical and experimental analysis of guided wave propagation in plate-like structures with sinusoidal thickness variations

Zima Beata, Moll Jochen

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e34, 2023

EN

Guided waves have attracted significant attention for non-destructive testing (NDT) and structural health monitoring (SHM) due to their ability to travel relatively long distances without significant energy loss combined with their sensitivity to even small defects. Therefore, they are commonly used in damage detection and localization applications. The main idea of incorporating guided waves in NDT and SHM is based on processing the received signals and appropriate interpretation of their characteristics. A great amount of research devoted to diagnostics of plate-like structures considers specimens with constant thickness, which significantly facilities the diagnostic process. In such a case the velocity is also assumed to be constant. However, the developed diagnostic methods should be applicable, especially for the structures exposed to an aggressive environment, excessive load, or unfavorable weather conditions, etc., when the probability of damage occurring is much higher. In such cases, the assumption about the uniform thickness alongside the propagation path cannot be applied in every case. Thus, the present study is focused on wave propagation in metallic plates with variable thickness. The results of theoretical, numerical and experimental investigations of antisymmetric Lamb mode propagation in aluminum plates with a sine-shaped surface are presented. In the first step, the influence of non-uniform thickness distribution on wave velocity has been described. Next, the inverse problem aimed at shape reconstruction based on time of flight (ToF) analysis and spatially varying wave velocity was solved and compared with the standard dispersion curve-fitting method.

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The costs of the prototype production

Podhorský J., Hrček S., Šéry F.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 85, nr 42

181-186

EN

The contribution deals with the economical aspects of the production of prototypes. The basic comparision of the rapid prototype production with the conventional technologies is done.

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Rapid prototyping versus CNC prototype manufacturing

Hrček S., Podhorský J.

Prace Naukowe Instytutu Technologii Maszyn i Automatyzacji Politechniki Wrocławskiej. Konferencje

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2004

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Vol. 85, nr 42

137-142

EN

The main problem in spreading of the Rapid Prototyping and Rapid Production technologies and manufacturing devices in our industrial environment is lack of the knowledge about the advantages of these technologies. The goal of the contribution is to present the comparison of the time consumption for the production of the various products by the means of the CNC technologies and RPT technologies.

4

Simulations of the manufacturing process for EDM electrodes used at casting dies for mechatronic parts

Popa M., Preja D., Rus C.

Elektronika : konstrukcje, technologie, zastosowania

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2004

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Vol. 45, nr 8-9

224-225

EN

Many mechatronic products are equipped with sophisticated control systems that contain chips and processors. Efficient cooling solutions are needed to deal with the thermal problem. The manufacturing of casting moulds tor computer coolers presents some problems, due to the shape and size of the cooler walls. EDM - Electrical Discharge Machining is some times the only available solution in this case; curved canals with small thickness end considerable depth can be manufactured trough EDM. The purpose of the paper is to present our researches with the goal to simulate (using the latest software products) the manufacturing, trough CNC milling, of the copper and graphite EDM electrodes.

PL

Wiele produktów mechatronicznych wyposażonych jest w wyrafinowane układy sterowania, zawierające układy scalone oraz procesory. Aby uporać się z problemem termicznym potrzebne są rozwiązania zapewniające efektywne chłodzenie. Na przykładzie wytwarzania form odlewniczych do komputerowych wiatraków można pokazać niektóre problemy związane z kształtem oraz wielkością ścianek wiatraka. W tym przypadku obróbka elektroiskrowa jest czasami jedynym możliwym rozwiązaniem. Zakrzywione kanały o małej grubości i znacznej głębokości można wytworzyć właśnie za pomocą tej obróbki. Referat ma zaprezentować nasze prace badawcze mające na celu zasymulowanie (przy użyciu najnowszego oprogramowania) wytwarzania miedzianych i grafitowych elektrod do obróbki elektroiskrowej za pomocą frezowania na obrabiarce sterowanej numerycznie.