This technique basis is evaluation of the mobility degree through dynamic analysis having recourse to the application of an impulsive excitation on the tooth by means of an impact hammer and the measurement of the displacement by a laser Doppler vibrometer
. This arrangement facilitates uncomplicated and versatile noncontact measurements with precision and sensitivity (<0.1 mm/s).
The laser technique includes the use of a noncontact laser vibrometer
aimed at cable from a distance.
The vibration characteristics of the optimized capsule were measured using a laser vibrometer
. The out-pile test conditions of a 110% reactor coolant flow amount resulted in a coolant flow-induced vibration having a frequency of about 11 Hz and complex vibration amplitude .
Hence, we measured the amplitude at the hazardous position using the laser vibrometer
and assumed these amplitudes were equal.
The overall size of the piezo stimulator allowed it to fit under the objective lens of the laser Doppler vibrometer
The frequency differences between Figures 13(a) and 13(b) result from FFT processing of optical signal (laser Doppler vibrometer
) and that of electrical signal, respectively.
A laser Doppler vibrometer
, similar to that used by Oberholster and Heyns , was used to calibrate the individual accelerometers that were mounted on each blade.
On the one hand, due to light weight, closed modes, low vibration level, and complicated local vibration of TCS, traditional accelerometer will bring added mass and stiffness to the tested shell , which will severely affect the tested frequency and damping results, so laser Doppler vibrometer
is used as noncontact response sensor to measure the vibration and frequency information of the shell.
This includes the programming of the control unit and the mechanical testing of the flap movement with a laser Doppler vibrometer
which is presented in this paper.
Data were collected using a sheet-type body vibrometer
, as described below.
The signals are detected by means of a laser vibrometer
, which measures the out-of-plane velocity on a surface point.