 |
- Sweep excitation is one of the methods to measure
natural frequency of parts etc. The sweep averaging
function of the DS-2000/3000 series calculates the
frequency response function of the vibration on the
excitation table and acceleration of measurement object
by sine sweep.
- The sweep time must be taken long time (approx. from
several minutes to several tens of minutes). Because a
measurement will take long time in low frequency range,
and it needs to minimize the frequency variation since
excitation frequency of vibration exciter and sampling
frequency of the DS-2000/3000 series are measured
asynchronously.
- You can see several peak values depending on a shape
of a measurement object. Damping ratio also can be
calculated by using half-power bandwidth method.
Moreover, integrating function enables display and
evaluation of velocity/force (mobility),
displacement/force (compliance), force/acceleration
(dynamic mass), force/velocity (mechanical impedance),
force / displacement (dynamic rigidity).
*More accurate measurement is possible
if an excitation controller has an external signal input
connector. Synchronous measurement with the sweep is
enabled by input of sine sweep signal from DS-0271A
(signal output unit for the DS-2000 series).
*Other models of FFT analyzer can be applicable
(CF-5200Z, CF-3600A or CF-7200).
|
