Wyniki wyszukiwania - BazTech

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Possibility of assessment of operation of sliding bearings in piston-crank mechanisms of diesel engines with regard to load and time of correct work of the bearings by applying acoustic emission as a diagnostic signal

Girtler J., Darski W.

Journal of Polish CIMAC

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2014

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Vol. 9, no 2

69--82

EN

The paper presents a possibility of determining (assessing) operation of sliding bearings with multilayer bushings in crank-piston mechanisms of diesel engines. Properties of load and wear, particularly fatigue and abrasive, are characterized in general. Acoustic emission as a diagnostic signal was proved to be useful for detection of the wear of sliding and barrier layers. Results of measurements of acoustic emission parameters, made with AMSY-5, the 12-channel system, manufactured by Vallen GmbH are presented herein. The measurements include such parameters as: the number of discrete emissions determined by counts of EA events, the effective value (RMS), the number and also the rate per unit of time of oscillating above the threshold level (the number of exceeding the threshold level), amplitude of discrete emission signal, rise time, duration time and damping time of discrete emission, power (energy unit) of discrete emission signal. The usefulness of acoustic emission (AE) application as a diagnostic signal for detection of micro-damage in sliding and barrier layers of bearings in crank-piston mechanisms of diesel engines was confirmed.

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The Use Of Acoustic Emission To Identification Damages Bearings The Main And Crank Engines About The Automatic Ignition

Girtler J., Darski W., Sikora J., Majewski W., Baran I., Nowak M.

Journal of Polish CIMAC

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2009

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Vol. 4, no 2

57-69

EN

The article describes the laboratory tests, which make the first stage of the study concerning the use of the AE method to determine the technical state of the slide bearings in engines with self-ignition. The aim of the present tests was to compare the recorded signals in relation to the technical state of the material of the bearing bush and to check the possibility of using the AE method in determining the transition moment from the fluid friction into the semi-dry friction in the bearing and signaling the first micro-defects of the material of the bearing bush. The experiment has not solved the problem, but they are of a development character and will be continued in the nearest future.

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AE Testing of Local Corrosion in Storage Tanks of Oil Tankers

Bugłacki H., Darski W., Malinowski S., Smajdor M.

Marine Technology Transactions. Technika Morska

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2007

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Vol. 18

43-50

EN

The research on problem of corrosion appearance and development and its impact on the condition and safety of oil tanker hulls was intensified after it was given a green light following the spectacular tanker disasters destroying fauna and flora in the inshore waters alongside the coast of significant length. The European Union supported the scientific research aiming at diminishing the risk of sea disasters out of concem for environmental protection and oil tanker safety. The crude oil tankers were identified as potentially the most dangerous. Acoustic Emission (AE), a modem, non-invasion technology of assessing the hull's condition may be employed to watch over the processes and activity of corrosion effects within the shell plating of tankers (the bottom and the sides). AE techniques used onshore (e.g. assessment of onshore crude oil storage tanks) were to be transferred to offshore conditions. The successful implementation will mean a significant progress in crude oil maritime transport safety.