Appendix C: Mechanical dynamic loading
140
Manual
DLoG X Series
21.5.
Determining natural frequencies
There are several ways of determining a system’s natural frequencies:.
•
Take field measurements with acceleration sensors and frequency analyses
(very time-consuming, but produces accurate results for all spatial axes)
•
Calculating the known static spring deflection using the following quantity
equation (minimal measurement work, good approximation)
Whereby: f
e
natural frequency in Hz
x
st
static spring deflection in mm
= deflection of the center of gravity in the direction of the
gravitational force (for example using a mechanical timer)
Further technical information can be found in the product
documents provided by the elastomer spring manufacturers.
St
x
f
e
8
,
15
≈
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