Wyniki wyszukiwania - BazTech

1

Application of acoustic emission in fatigue fracture diagnostics

Skalsky V., Halan P.

Acta Mechanica et Automatica

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2010

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Vol. 4, no. 4

95-98

EN

The most important peculiarities of the acoustic emission under fatigue loading are reviewed. Dependences of the AE signals and parameters of the growing fatigue crack on the basis of an existing literature source review are established. An essential role of the correlation for determining the crack growth rate in the relation between the AE parameters and crack parameters are shown. An energy approach for determination of cycle quantities till the initiation of a crack is proposed.

2

Estimation of diagnostics of fibers failure in composite materials by the method of acoustic emission

Skalsky V., Serhiyenko O., Rudavskyy D., Matviyiv Y.

Acta Mechanica et Automatica

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2009

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Vol. 3, no. 4

65-68

EN

The model of acoustic emission caused by formation of penny-shaped cracks in fiber composite materials taking into account stress relaxation in breaking fibers is proposed. It is found that the maximal values of components of displacement vector are directly proportional to the total area of defect, which is formed, and inverse proportional to the relaxation time.

3

Ocena przebiegu procesu tribologicznego na podstawie widma emisji akustycznej

Guzik J.

Tribologia

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2007

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nr 2

209-217

PL

Część energii dostarczonej do węzła tarcia jest dalej przetworzona na emisję akustyczną (EA). Powszechnie wiadomo, że sygnał EA zależy od właściwości tribologicznych węzła tarcia. W artykule porównano zmierzone sygnały EA węzła maszyny MT-1 (Rys. 1) docieranego z olejami zawierającymi wybrane dodatki smarnościowe. Jednocześnie mierzono współczynniki tarcia w badanym węźle. Opracowano nowy deskryptor sygnału EA (równanie 2). Może to umożliwić ocenę przebiegu procesu tribologicznego w węzłach tarcia maszyn roboczych, gdyż akcelerometr można umieścić w różnych miejscach maszyny.

EN

A part of energy supplied to the friction pair is later transforming into acoustic emission (AE). It is commonly known, that AE signal depends on tribological properties of the friction pair. AE signals of the friction pair of MT-1 machine (fig. 1) running-in with oils containing chosen lubricity additives were presented in this paper. At the same time friction coefficients of friction pair were measured. A new descriptor of AE signal was worked out (equation 2). It can enable estimation course of tribological process in friction pair of commercial machines, because accelerometer can set in different places of machine.

4

Investigation of acoustic emission signal generated in the friction pair lubricated with oils containing various lubricity additives

Guzik J., Wojtyniak M., Olszowski S., Marczak M., Ranachowski Z.

Engineering Transactions

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2006

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Vol. 54, iss. 2

159-166

EN

The energy supplied to the friction pair is dissipated producing mainly heat. However, a small part of it radiates in the form of transient elastic waves or in other words, as the acoustic emission (AE) signal. This article presents measurement results of the AE signal generated in the four-ball friction pair lubricated with oil containing chosen lubricity additives. Measurements of the AE signal have been performed in conditions of continuous load increase. Values of friction torque in the pair were recorded simultaneously with AE measurements. It is expected that diagnostic measurements of AE signal generated in friction pairs of working machinery will be possible soon.

5

Sygnał emisji akustycznej generowany w węźle tarcia smarowanym olejem z różnymi dodatkami smarnościowymi

Guzik J., Ranachowski Z.

Tribologia

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2005

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nr 4

103-112

PL

Energia dostarczona do węzła ulega dyssypacji produkując głównie ciepło, natomiast niewielka jej część wypromieniowuje w postaci fal sprężystych, czyli jako sygnał emisji akustycznej (EA). W artykule przedstawiono wyniki pomiarów sygnału EA węzła aparatu 4-kulowego smarowanego olejem zawierającym wybrane dodatki smarnościowe. Badania sygnału EA wykonano przy rosnącym obciążeniu węzła tarcia i porównano ze zmianą momentu tarcia w węźle. Przewiduje się, że możliwe będą diagnostyczne pomiary sygnału EA węzłów tarcia w maszynach roboczych.

EN

The energy supplied to the friction pair is dissipated producing mainly heat, whereas a smali part of it radiates in form of stress waves or in other words as the acoustic emission (AE) signal. This article presents the measurement results of the AE signal of the 4-ball machine kinematic pair lubricated with oil containing chosen lubricity additives. The measurement of the AE signal has been performed with the increasing load of the friction pair and testing the changes of friction moment in the pair in the same time. For example, the change of the friction moment for oil without additives (line a - Fig. 5) comes under 405 N load, identically like change of acoustic emission (AE) signal (Fig. 6a). The change of AE signal is very high for tkis oil. Changes of the friction moment are higher for oil with antiwear additive (AW, line b, Fig. 5 and 6) or with extreme pressure additive (line c, Fig. 5 and 6). It is foreseen, that there will be possible diagnostic measurements of the AE signal of the friction pairs in the working machinery.