Spray Formation and Structural Deformation During the Oblique Impact of a Flexible Plate on a Quiescent Water Surface

Wang, An; Kim, Hyun-Tae; Wong, Kit Pan; Yu, Miao; Kiger, Ken; Duncan, James H.

doi:10.5957/josr.10180093

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…The slamming experiments were carried out in a towing tank system, as shown in figure 6(a). Details of the towing tank system have been discussed in [1]. An aluminum plate (1219 mm × 381 mm × 7.9 mm) was mounted on a carriage with a pitch angle α = 5 • and a roll angle β = 10 • .…”

Section: Experiments Arrangementmentioning

confidence: 99%

“…There have been efforts for investigating the slamming phenomenon, and many of them have focused on the study of fundamental problems such as the impact of a flat or wedge plate on the water surface (e.g. [1,2]). In such studies, monitoring the structural responses is important for better understanding of the complex fluid-structure interaction during the slamming event.…”

Section: Introductionmentioning

confidence: 99%

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High-speed interrogation of multiplexed fiber Bragg grating sensors for monitoring dynamic strain responses during a flexible plate impact on a water surface

Wong

Kim

Wang

et al. 2020

Smart Mater. Struct.

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The investigation of fluid-structure interaction during the impact of a flexible plate on a water surface has received much attention. Measurement of highly transient, distributed strain of the plate during the slamming event is of great interest. Multiplexed fiber Bragg grating (FBG) strain sensors provide a promising solution for such measurement since these sensors are inherently waterproof and are immune to electromagnetic interference. However, in order to monitor the highly transient, distributed strain responses (up to 20 kHz), high-speed simultaneous interrogation of multiplexed FBG sensors is required, which is challenging by using commercial optical interrogators. We present a tunable-wavelength-filter-based optical interrogation system for high-speed simultaneous interrogation of multiplexed FBG strain sensors and demonstrate its application for structural monitoring of a flexible plate during the slamming event. The interrogation system employs a piezoelectric-transducer-controlled Fabry–Perot tunable filter. By operating the tunable filter at its resonant frequency and demodulating the sensor signal based on a peak tracing method, we demonstrated an interrogation speed of 100 kHz, an interrogation range of 98 nm, and an interrogation resolution of 5 pm. For proof-of-performance, the interrogation system was used to monitor the vibrational responses of a cantilever plate under impact loading and the measurement of vibration modes up to 6.785 kHz was demonstrated. Finally, the slamming experiments were carried out with six multiplexed FBG strain sensors mounted on a flexible plate. The dynamic strain measurement of the plate during the slamming event was successfully demonstrated by using the high-speed FBG interrogation system.

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Section: Experiments Arrangementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-speed interrogation of multiplexed fiber Bragg grating sensors for monitoring dynamic strain responses during a flexible plate impact on a water surface

Wong

Kim

Wang

et al. 2020

Smart Mater. Struct.

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“…Wang et al. (2019) performed an experimental study on the oblique impact of a flexible and a rigid plate with non-zero pitch and roll angles. Under the same motion trajectory, it is found that the maximum deformation of the flexible plate occurs at a more downstream location for a greater impact speed.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of gravity on the impact at low initial impact velocity is pointed out by the authors. Experimental investigations on the vertical impact of an inclined nearly rigid plate with prescribed impact velocity on a water surface were performed by Wang et al (2016) and . In the effect of gravity on the evolution of the spray over time was characterized by an instantaneous Froude number associated with the temporally varying nominal submerged length of the plate.…”

Section: Introductionmentioning

confidence: 99%

The controlled impact of elastic plates on a quiescent water surface

Wang

Wong

et al. 2022

J. Fluid Mech.

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The impact of flexible rectangular aluminum plates on a quiescent water surface is studied experimentally. The plates are mounted via pinned supports at the leading and trailing edges to an instrument carriage that drives the plates at constant velocity and various angles relative to horizontal into the water surface. Time-resolved measurements of the hydrodynamic normal force ( $F_n$ ) and transverse moment ( $M_{to}$ ), the spray root position ( $\xi _r$ ) and the plate deflection ( $\delta$ ) are collected during plate impacts at 25 experimental conditions for each plate. These conditions comprise a matrix of impact Froude numbers ${Fr} = V_n(gL)^{-0.5}$ , plate stiffness ratios $R_D= \rho _w V_n^2 L^3D^{-1}$ and submergence time ratios $R_T= T_sT_{1w}^{-1}$ . It is found that $R_D$ is the primary dimensionless ratio controlling the role of flexibility during the impact. At conditions with low $R_D$ , maximum plate deflections on the order of $1$ mm occur and the records of the dimensionless form of $F_n$ , $M_{to}$ , $\xi _r$ and $\delta _c$ are nearly identical when plotted vs $tT_s^{-1}$ . In these cases, the impact occurs over time scales substantially greater than the plate's natural period, and a quasi-static response ensues with the maximum deflection occurring approximately midway through the impact. For conditions with higher $R_D$ ( $\gtrsim 1.0$ ), the above-mentioned dimensionless quantities depend strongly on $R_D$ . These response features indicate a dynamic plate response and a two-way fluid–structure interaction in which the deformation of the plate causes significant changes in the hydrodynamic force and moment.

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A new engineering theory describing oblique free surface impact by flexible plates

Earls

2022

Ocean Engineering

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Spray Formation and Structural Deformation During the Oblique Impact of a Flexible Plate on a Quiescent Water Surface

Cited by 4 publications

References 24 publications

High-speed interrogation of multiplexed fiber Bragg grating sensors for monitoring dynamic strain responses during a flexible plate impact on a water surface

High-speed interrogation of multiplexed fiber Bragg grating sensors for monitoring dynamic strain responses during a flexible plate impact on a water surface

The controlled impact of elastic plates on a quiescent water surface

A new engineering theory describing oblique free surface impact by flexible plates

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