Appendix
E:
Mechanical dynamic loading
DLoG MPC 6
Manual
163
20.5.
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, very good approximation)
Where: 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
≈
