February 2020 Joint Society Meeting Notice SNAME/IMarEST/ASNE/SMPE Hosted by SNAME
Small, high-speed planing craft are often subject to repeated slamming events, which can cause interesting fluid-structure interactions. The loads and structural response of the vessel depends on a number of factors such as wave topography, impact angle, forward speed, encounter angle, and height of the vessel relative to the water surface before impact. Wave-load predictions, rigid body motions, and structural response are difficult to predict due to the complex interactions of this nonlinear phenomenon. Much of the criteria for designing high-speed planing craft are based on semi-empirical data and often lead to overly conservative designs, which limits the operational envelope of the vessel.
One approach to exploring this fluid-structure interaction is to study the vertical impact of a V-shaped wedge in calm water, which serves as a model for a single slam event after a vessel has become partially airborne. This problem is well-known in the field of Naval Engineering and hydrodynamic loads on rigid wedges can be accurately predicted using existing analytical methods. This presentation will focus on wedges with flexible bottom plates fabricated from aluminum and composites that are outside of the scope of existing analytical methods. Pressure on the wedge bottom, rigid-body kinematics, full-field out-of-plane deflection, and spray root evolution were measured. The out-of-plane deflection was measured using Stereoscopic-Digital Image Correlation (S-DIC). Comparisons of the experimental results are made to an in-house two-way coupled, semi-theoretical model.
A second approach to understanding slamming on small craft is to perform tow tank experiments in waves. Future experiments are planned in the VT Advanced Towing Tank Facility using a Vertical Planar Motion Mechanism. These new facilities are still currently under development through collaborations with DLBA, Stevens Institute of Technology, MAPC, and WL3 Solutions. Preliminary features of the new facility will be discussed as well as the plans for the non-traditional slamming experiments that will be performed using data collected from traditional towing tank experiments. This project is funded by the Office of Naval Research. SPEAKER
Christine M. Gilbert, PhD Assistant Professor
Kevin T. Crofton Department of Aerospace and Ocean Engineering
Virginia Polytechnic Institute and State UniversitySPEAKER BIO
Dr. Christine Gilbert (née Ikeda) is an assistant professor in the Kevin T. Crofton Department of Aerospace and Ocean Engineering at Virginia Polytechnic Institute and State University. Dr. Gilbert received her PhD from the University of Maryland in Mechanical Engineering in 2012. She has held appointments at the U.S. Naval Academy and the University of New Orleans before joining the faculty at Virginia Tech in Fall 2016. Dr. Gilbert is a 2015 Office of Naval Research Young Investigator Program (YIP) and a 2020 National Science Foundation Early Career Development Program (CAREER) Awardee. Dr. Gilbert has recently received funding for an ONR DURIP called, “Advanced Towing Tank Carriage and Instrumentation for the Study of Small Vessels in Waves.” This project is currently ongoing and will equip Virginia Tech with a high-speed towing carriage (top speed of 20 ft/s) and a vertical planar motion mechanism (VPMM) that will allow for controlled, nontraditional slamming experiments. This project is in collaboration with DLBA, Stevens Institute of Technology, MAPC, and WL3 Solutions. RESERVATIONS / CANCELLATIONS
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