Drvna industrija, Vol. 63 No. 2, 2012.
Original scientific paper
https://doi.org/10.5552/drind.2012.1130
Diagnostics of Circular Sawblade Vibration by Displacement Sensors
Přemysl Veselý
; Faculty of Forestry and Wood Technology, Mendel University, Brno, Czech Republic
Zdeněk Kopecký
; Faculty of Forestry and Wood Technology, Mendel University, Brno, Czech Republic
Zdeněk Hejmal
; Faculty of Forestry and Wood Technology, Mendel University, Brno, Czech Republic
Přemysl Pokorný
; Faculty of Forestry and Wood Technology, Mendel University, Brno, Czech Republic
Abstract
The paper deals with problems of the circular sawblade vibration. In the introductory part, theoretical bases are summarized to determine the form of vibrations and critical and resonant rotational frequency. A diagnostic method is proposed for the direct measurement of amplitudes of a circular sawblade by displacement sensors with the subsequent Fast Fourier Transform (FFT) analysis. This method with the spectral analysis of a signal in the time area makes possible to determine the size and shape of vibration of a circular sawblade with respect to usability/applicability under operational conditions. Unlike standard methods, when the sawblade is excited by external sources, natural vibrations are used such as disk deformations and the dynamic unbalance of a circular sawblade, effects of chucking/gripping and machine vibration and, last but not least, the disk and sawn wood interaction.
Keywords
circular sawblade; critical rotational speed; resonant rotational speed; vibration; Fast Fourier Transform analysis
Hrčak ID:
83467
URI
Publication date:
25.6.2012.
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