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| 1.1 Prediction of the system torsional vibration characteristics.
An
adequate prediction of the system torsional vibration characteristics
can be made by the following method. |
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|
1.1.1
Use
the torsional stiffness as published in the catalogue which is based
upon data measured at a 30o C ambient
temperature. |
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1.1.2
Repeat
the calcualtion made as 1.1.1. but using the maximum temperature correction
factor St100 to M100 for the rubber
selected for both torsional stiffness and dynamic magnifier from the
table below.
CT30 = CT30 x St |
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| Rubber
Grade |
Temp max Co |
St |
| SM
60 |
100 |
St100 = 0.60 |
| SM
70 |
100 |
St100 = 0.44 |
| SM
80 |
100 |
St100 = 0.37 |
| SM
60 considered "standard" |
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| Rubber
Grade |
Dynamic
Magnifier at
30o C( M30) |
Dynamic
Magnifier at
100o C( M100) |
| SM
60 |
8 |
10.67 |
| SM
70 |
6 |
9.53 |
| SM
80 |
4 |
6.9 |
| SM
60 considered "standard" |
|
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1.1.3. |
Review
the calcualtion 1.1.1. and 1.1.2. and if the speed range is clear of
criticals which do not exceed the allowable heat dissipation
value as published in the catalogue, the coupling is then considered
suitable for the application with respect to the torsional
vibration characteristics. It there is a critical in the speed range
the acutal temperature of the coupling will need to be calculated. |
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1.2 Prediction of the actual
coupling temperature and torsional stiffness |
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1.2.1 |
Use
the torsional stiffness as published in the catalogue, which is based
upon data measured at 30oC
( M30 ) |
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2.2.2 |
Compare the syntehsis value
of the calculated heat load in the coupling (Pk) at the speed of interest
to the "Allowable Heat Dissipation" (TKW). |
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The
coupling temperature rise |
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