Title: Nanosheets and Nanostructured Thin Films of Metal Oxides for Practical Applications
Speaker: Dr. Halil Basturk
Date/Time: November 11, 2015 Wednesday, 13:40 - 14:30
Place: FENS L055
Abstract: This talk is on a theory to design a controller, which estimates and cancels unknown sinusoidal disturbances forcing a linear time-invariant system by using only measurement of state-derivatives of the system. The developed design is employed to solve the problem of cargo transfer in high sea states over a ramp from a large, medium-speed, roll-on/roll-off (LMSR) vessel to a smaller connector vessel of a surface effect ship (SES) type. The aim is to reduce ramp motion between the LMSR and SES in order to provide a safer environment for cargo transfer. An air cushion actuated controller is designed to estimate and cancel the wave disturbance and stabilize the heave of the SES via heave acceleration feedback with actuation of the ouver area for the case where the hydrodynamic and other parameters of the SES are not known a priori and the pressure dynamics of the air-cushion contains nonlinearly parameterized unknown terms. The effects of the control designs are demonstrated in simulations in a time-domain seakeeping code, named AEGIR.The developed controller is also implemented on a scale model SES. Several experiments are performed in a wave tank to test the performance of the controller. It is shown that the experimental results are consistent with the developed theory.
Bio: Halil I. Basturk received his B.S. and M.S. degrees in Mechanical Engineering from Bogazici University in 2006 and 2008, and the Ph.D. degree in Mechanical and Aerospace Engineering from the University of California at San Diego in 2013. He worked as a postdoctoral scholar at UCSD for one year. He is now an Assistant Professor in the department of Mechanical Engineering at Bogazici University. His research interests include disturbance estimation/cancellation, adaptive control, delay systems and infinite dimensional systems.