User manual

F-6 8580/8590 Vehicle-Mount Computer User Manual
Appendix F: Mechanical Dynamic Loading
Further Possible Steps For Optimization
This theoretical value of 19.1 Hz lies in the range of 20 Hz to 5 Hz as measured in practice.
The calculations depicted above are only approximations, which is why we recommend a
final field test with the selected elastomer springs.
F.6 Further Possible Steps For Optimization
• If it turns out that the 8580/8590 resonance deflections could be greater, the natural fre-
quency can be reduced.
In our selected example, softer elastomer springs with the same construction could be used.
In that case, it would still be possible that a Shore hardness of A55 activates approx. 13 Hz.
• However, if the resonance deflections are too high (10 mm and more), the natural fre-
quency should be increased.
For example, using 3 elastomer springs with a diameter of 40 instead of 30 mm or using 4
instead of 3 springs.
The number, form, material type and arrangement of the elastomer springs can be used to
control the natural frequency. As a rule, constructions with vulcanized fittings are used.
Important: Static tensile loads on the elastomer springs should be avoided, as the
elastomer can tear easily. A 8580/8590 should therefore never be sus-
pended from elastomer springs.