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The essence of vibration control
1. User defines his vibration test requirement by entering his data
into the vibration controller. This defines the frequency and
amplitude content of the required vibration as is often specified by
an industry standard such as a MIL STD or DEF STAN etc.
2. The vibration controller produces an initial drive signal
3. The signal is amplified by a power amplifier that drives a
shaker. An electro-dynamic shaker operates over a wider frequency
range than a hydraulic shaker but a hydraulic shaker is capable of
more force and displacement.
4. The Unit Under Test (UUT) is mounted on the shaker table. The
vibration on the shaker table is measured using an accelerometer whose
signal is fed back to the vibration controller.
5. A control algorithm within the controller computes the transfer
function of the closed loop system and hence corrects the output drive
signal such that the vibration on the shaker table matches the user
defined frequency and amplitude specification. |
