Abstract:
This paper investigates the opportunities of observing the response of a
cantilevered flat plate through vibration analysis using Eddy-Current Displacement
sensors. External disturbance such as excitations, fluctuating loads etc. in plates causes
vibration problem. Coupled bending and torsional motion is found in vibration
analysis of cantilevered flat plates. It has been observed previously that with the
increase in crack or slit length, natural frequency of a plate structure decreases. Here,
non-linear vibration response for different crack position and length are to be inspected
in relevance with similar works of other authors and also using finite element method
for cross verification. Eddy-Current displacement sensors are used for measuring very
small changes in displacement. Different types of root-slit are inspected numerically
and experimentally. The output from the sensor are compared with available data. The
linear free vibration response of cracked flat plate is measured using FEM calculation.
The veering seen in between the higher modes of different crack models are also
assessed. Errors found in the finite element analysis is also corrected and pointed out.
The results validate the use of eddy-current displacement sensors in addition with the
possibility of using FEM calculations for crack detection in a given structure.
