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The Analysis of Mechanical Vibrations and Acoustic Pressure Level οf a Transformer Model

100%
Boczar T., Borucki S., Cichon A., Lorenc M.
Acta Physica Polonica A
|
2008
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vol. 114
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issue 6A
A-21-A-26
EN
The paper presents the results of vibroacoustic investigations and the measurements of the acoustic pressure level (noise) of a transformer model. The measurements were taken at a full transformer load in two operation conditions: at a producer packeted core and at unpacketed core. Unpacketing consisted in loosing the screws pressing the particular core plates. Mechanical vibrations were registered and the acoustic pressure level was measured. The vibroacoustic analysis results are presented in the form of frequency spectra and the results of the acoustic analysis of the transformer under study are shown by determining corrected values of the acoustic pressure level and by a frequency analysis.
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Strain-Dependent Damping of Ti-10V-2Fe-3Al at Room Temperature

80%
Göken J., Fayed S., Skubisz P.
Acta Physica Polonica A
|
2016
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vol. 130
|
issue 6
1352-1357
EN
The Ti-10V-2Fe-3Al alloy is advantageous over other titanium grades due to its high tensile strength and its high resistance against creep, cracking, and corrosion. The investigated alloy was hammer-forged inducing high strain rates in the material at a temperature of 800°C and underwent different cooling procedures. Three in that way thermomechanically treated specimens were prepared for subsequent study of the vibration behaviour of the material with the help of non-destructive, contact-free acoustic measurements. Resulting time-dependent decaying acoustic signals were analysed to investigate the dependence of the material damping behaviour on the individual downstream thermal treatment procedure and, ultimately, on the microstructural changes.
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