Anthony D., Simón F.

In the field of Acoustic Structural Active Control (ASAC) the use of continuous strain sensors (for example PVDF sensor strips) is often considered. These have the advantage of directly measuring radiation modes through a specific combination of structural modal amplitudes without requiring further signal processing by shaping the width of the sensor strip along its length. However, radiation modes are frequency dependent, more so in the frequency region where ASAC would be applied for typical panel sizes. One solution would be to use discrete sensors but this loses the advantage of using PVDF sensors. It is shown the main frequency dependence is largely due to i) displacement instead of velocity sensing, and ii) a frequency dependent offset term that can be corrected with a temporal filter. The accuracy of the measurement of the first radiation mode can be improved and the total power radiated better represented.