DYNAMIC BEHAVIOR CHARACTERIZATION Sample Clauses

DYNAMIC BEHAVIOR CHARACTERIZATION. In a wave tank experiment, the physical parameters to be measured are not static but dynamic. Therefore attention must be paid to the sensor ability to transcribe the physical phenomenon variations into electrical variations without loss of information. To really be thorough, all the sensors should be tested dynamically. However having a traceable reference with known uncertainty for dynamic calibration is not easy. Force sensors can be calibrated with a reference spring associated to transition stage and a reference position sensor. Pressure sensors can be calibrated with a special pressure generator reference device. Force sensors installed onboard moving bodies experience acceleration and measure the inertia component of the sensors. Dynamic calibration or at least evaluation of the active mass of the sensor should be made prior to trials and inertia force components be removed from the total force signal. This aspect is the most important for multiple axis force sensors for which forces and moments may be influenced by the motions (angles and accelerations). Associated situations are both sensors on board floating bodies measuring mooring or connection forces or PTO forces and sensors measuring loads in the case of forced motions for instance with a hexapod. Practically we only apply the following procedure for the wave gauges and the capacitive water elevation probes. The sensor follows the surface of water in a jug moved by a vertical translation stage. The sensor output is compared to the jug motion measurement. The jug motions are measured by a reference magnetostrictive displacement sensor set up on the vertical translation table. This reference sensor is checked by a certified calibration laboratory every year. The water jug describes a vertical sinusoidal monochromatic motion. 93 period/magnitude combinations are chosen in the working domain of the wave gauge, which depends on the wave maker capacities. Dynamic calibration data points Magnitude (cm) Period (s) 30 25 20 15 10 5 0 0 1 2 3 4 5 Figure 2.4: Period-Magnitude couples used for calibration Figure 2.5: calibration tests bench A data acquisition system connected to a PC measures the signals from the wave gauge and from a reference at 100Hz. Each test contains a starting ramp, ten periods at full amplitude and an ending ramp. The calibration signals analysis is similar to the regular wave tests analysis. For the selected time interval, a discrete Fourier transform is calculated and the ampl...
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