A new face drilling rig for narrow tunnels and ... - Advanced Mining
A new face drilling rig for narrow tunnels and ... - Advanced Mining
A new face drilling rig for narrow tunnels and ... - Advanced Mining
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Issue 04 | 2010<br />
TRANSFER OF TECHNOLOGY<br />
frequency, time frequency-amplitude l<strong>and</strong>scape. The height of the l<strong>and</strong>scape characterizes the acceleration measured.<br />
The blue field represents a view descending vertically towards this l<strong>and</strong>scape. The colour code represented on the left<br />
characterizes the corresponding acceleration. In the diagram that can be seen below the abscissa, there is plotted the<br />
sequence of frequencies above the frequency. Clearly to see is the maximum at 511Hz. The frequencies that can be seen<br />
beside the calculated main frequency are a consequence of the fact that it is a matter of an excited continuum <strong>and</strong> not of<br />
a single degree-of-freedom- system, <strong>and</strong> that the vibrations get also excited by side effects in other ranges of frequency. It<br />
mainly concerns here excitations due to friction, bending vibrations, roll-over frequencies of bearings, etc.<br />
Fig. 23: FFT Analysis Lifting-Closing Gear 2500Hz<br />
Fig. 22:<br />
FFT Analysis Speed influence<br />
www.advanced-mining.com<br />
88
Change language