A Measurement System for Experiments on the Impact of a Flexible Plate on a Water Surface
Abstract
Planned Flexible Plate Impact StudyIn the proposed experiments, at plate models will be driven into a quiescent water surface using highly repeatable plate motions. The plate orientation (pitch and roll angle), the plate velocity (both horizontal and vertical velocity components), the plate vertical deceleration during the impact, and the dynamic properties and mounting system of the plate will be varied. Both existing measurement systems and the proposed plate dynamics measurement system will be used to simultaneously fully measure many aspects of the impact process. The existing systems include a cinematic stereo Particle Image Velocimetry (PIV) system (up to 1,000 three-component velocity fields measured per second) to measure the water velocity field and a cinematic multi-camera Laser Induced Fluorescence (LIF) system to measure the shape of the water spray sheet generated by the impact as well as the resulting water droplets. The plate dynamics measurement system described in this proposal will consist of a fiber optic sensor array to measure the in-plane strain in the plate and the pressure on the bottom (wet) plate surface, stereo high-speed movie cameras to measure the full field out-of-plane displacement of the top plate surface and force sensors to measure the transient force and moment between the plate and the plate mounting system. The data will be used to explore the physics of liquid/structure impact processes and to provide data forresearchers engaged in the development of numerical models for the prediction of the impact behavior. Of particular interest in this regard will be the simultaneous measurements of the plate strain/out-of-plane displacement field and the pressure distribution on the wet plate surface. These two quantities are fundamental to the coupling of the fluid and structural models that will be used in the codes.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 23, 2016
- Source ID
- N000141613100
Entities
People
- James S Duncan
Organizations
- Office of Naval Research
- United States Navy
- University of Maryland