153. AIR CUSHION ADAPTIVE DISTURBANCE CANCELLATION FOR THE REDUCTION OF WAVE INDUCED MOTION OF RAMP-CONNECTED SHIPS

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Center for Control Systems and Dynamics (CCSD)
Faculty Advisor(s): Miroslav Krstic

Primary Student
Name: Halil I Basturk
Email: hbasturk@ucsd.edu
Phone: 858-534-5670
Grad Year: 2013

Abstract
We consider the problem of cargo transfer in high sea states over a ramp from an LMSR (large, medium-speed, roll-on/roll-off) vessel to a smaller connector vessel, the T-Craft. Due to the complexity of the wave and ship interactions, this problem represents significant challenges for ship and control system designers and requires the use of computational tools to simulate the system. We utilize Matlab, AEGIR, and Rhino to model and simulate the system in two configurations: 1) the ships are oriented side by side, and 2) the ships are in a bow-to-stern configuration. To reduce the oscillations in the ramp connecting the vessels, we design and employ adaptive wave cancellation algorithm with air flow rate as actuator. When the ships are oriented side by side, the wave disturbance in heave of the T-Craft is estimated and cancelled by using fans to control the pressure in an air cushion positioned underneath the vessel. For the bow-to-stern configuration, a two-chamber air cushion is considered, where wave disturbance in pitch is estimated and cancelled by inducing a moment through a pressure difference between the chambers. We present simulation results.

« Back to Posters or Search Results