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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the sound power of all electrical drive units belonging to<br />
the machines <strong>and</strong> the belt conveyor system, <strong>and</strong> to plan<br />
appropriate actions in the matter of sound control.<br />
While doing so, the calculation sequence is the easiest<br />
thing in the world. On the basis of the rated power <strong>and</strong> the<br />
speed of the drive unit planned to be installed, the sound<br />
power level to be expected of this power group will be<br />
taken from the st<strong>and</strong>ard IEC 60034-9.<br />
With the help of the gearbox type (bevel wheel gearbox,<br />
spur wheel gearbox, bevel <strong>and</strong> spur wheel gearbox,<br />
planetary gearbox) <strong>and</strong> the calculated, mechanical<br />
capacity of the drive unit, it is enabled the sound power<br />
expected of the gearbox to be taken from the st<strong>and</strong>ard VDI<br />
2159.<br />
The two sound powers are<br />
energetically added now. With it we<br />
are able to know the sound power level<br />
to be expected of the whole drive unit.<br />
With the help of the enveloping<br />
sur<strong>face</strong> of the drive unit, <strong>and</strong> known<br />
dimensions, it is possible now, to<br />
calculate the sound pressure at every<br />
arbitrary distance from the drive unit.<br />
A further, important vibration size is<br />
the frequency that must also be known<br />
to be capable of dimensioning drive<br />
units. Basing on the motor speed it is<br />
made possible to calculate the input<br />
frequency of the gearbox <strong>and</strong>, thus, all<br />
meshing frequencies.<br />
Issue 04 | 2010<br />
Table 10:<br />
Sound power levels dependent on rated power <strong>and</strong><br />
speed (IEC 60034)<br />
Schalleistungspegel dB(A)<br />
140,00<br />
120,00<br />
100,00<br />
80,00<br />
60,00<br />
40,00<br />
20,00<br />
TRANSFER OF TECHNOLOGY<br />
Since the eighties, gearboxes in Germany <strong>and</strong> all over<br />
the world get tested with a view to their vibration <strong>and</strong> noise<br />
properties. Among the data given by the manufacturers,<br />
there have been tested by the Forschungsvereinigung<br />
Antriebstechnik hundreds of st<strong>and</strong>ard gearboxes <strong>and</strong><br />
the results get published in the st<strong>and</strong>ard VDI 2159. This<br />
st<strong>and</strong>ard has been issued in 1985 <strong>for</strong> the first time <strong>and</strong> it<br />
got updated in 1999.<br />
Fig. 19:<br />
Sound power levels of spur wheel gearboxes as per VDI 2159-1985<br />
Stirnradgetriebe<br />
Industriegetriebe<br />
VDI 1985<br />
0,00<br />
0,1 1 10 100 1000 10000<br />
Mechanische Leistung kW<br />
L WA<br />
= 77 , 1 + 12 , 3 ⋅ log( P )<br />
Reihe1<br />
www.advanced-mining.com<br />
86
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