Development of a dynamic pressure standard of low amplitudes and frequencies
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Date
2021-11-08Author
Díaz Tey, Alberto
Govaere Vicarioli, Georges
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The height of the gravitational wave is an influential magnitude in the estimation of its energy content, a
very important parameter in the design of maritime structures such as piers and breakwaters, however,
there are reasonable doubts among researchers regarding the quality of its measurement.
The objective of the present work was to demonstrate that a stationary calibrated pressure transmitter
allows the indirect calculation of the wave height with satisfactory accuracy despite the fact that it is a
dynamic event as long as its frequency range is low, as is the case with the gravitational waves of the
Costa Rican Central Pacific Ocean: between 0.05 Hz and 0.39 Hz.
In the absence of a primary standard of periodic pressure disturbances, an alternate path was developed
based on the characterization of the parameters of the differential equation characteristic of a pressure
measurement system in a shock tube prototype from normal shock wave theory and subsequent
verification in a periodic disturbance generator that its attenuation and delay are practically negligible at
the frequency of 0,1 Hz.
The effect of the different geometry of the chamber of the pressure measurement system used in the sea
was evaluated pneumatically by comparison with the dynamic pressure standard in the prototype of the
periodic disturbance generator, while the effect of the compressibility of the fluid was evaluated in
water in the wave channel of the Laboratory of Maritime Engineering, Rivers and Estuaries of the
University of Costa Rica.
The results show that the pressure measured from the least-squared adjustment coefficients of an electric
current transmitter obtained by stationary calibration is acceptable to estimate the climatology of the
gravitational wave characteristic of the Costa Rican Central Pacific Ocean with maximum errors of 136
mm in waves of height up to 1,4 m.