Piezoelectric rod sensors for scour detection and vortex-induced vibration monitoring

As extreme events increase in frequency, flow-disrupting large-scale structures become ever more susceptible to collapse due local scour effects. The objective of this study was validate the functionality passive, flow-excited sensors that can continue operate during an event. sensors, or piezo-rods, feature continuous piezoelectric polymer strips embedded within and along length slender cylindrical rods, which could then be driven into soil where is expected. When erodes away foundation material reveal a portion piezo-rod, ambient fluid flow excitations would cause element output voltage response corresponding dynamic bending strains sensor. dependent on both structural properties sensor excitation fluid’s velocity. By monitoring shedding frequency velocity, exposed piezo-rod (or depth) calculated. Two series experimental tests were conducted work: (1) sediment around mock pier collect data, (2) used monitor its own by collecting vortex-shedding data varied velocities establish velocity–frequency relationship. results showed successfully captured comparable state-of-practice testing. A one-dimensional numerical model developed using relationship accuracy voltage-based prediction piezo-rod. Two-dimensional modeling also performed for predicting localized complex field. These velocities, conjunction with relationship, greatly improve length-predictive capabilities.