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
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Issue 04 | 2010<br />
Fig. 24:<br />
Comparison structure-borne<br />
noise/air-borne noise<br />
A superposition of the airborne<br />
<strong>and</strong> structure-borne sound<br />
measurements shows a very<br />
good con<strong>for</strong>mity with the maxima<br />
position above the frequency.<br />
Noise reduction measures<br />
Many noise reduction measures taken on the individual<br />
transport equipment are already described be<strong>for</strong>e.<br />
That is why we deem, at this point, necessary again a<br />
systematization of the measures <strong>and</strong> an explanation of their<br />
theoretical background. When planning noise reduction<br />
measures there must first be drawn a list from which can<br />
be seen all individual noise sources <strong>and</strong> their sound power<br />
TRANSFER OF TECHNOLOGY<br />
levels. All measures to be taken must now start at the<br />
loudest source, <strong>and</strong> dependent on the total sound source<br />
levels to be reached, the next loudest sources have to be<br />
taken into account.<br />
Fig. 25:<br />
Noise control measures<br />
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