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Florida Atlantic University
College of Engineering & Computer Science
Announces the
Ph.D. Dissertation Defense
of
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Takuya Suzuki
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for the Degree of
Doctor of Philosophy (Ph.D.)
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DISSERTATION TITLE: "Fatigue Life Prediction of Composite
Turbine Blades Under Random Ocean Current Loading"
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Tues., Oct. 31 at 1:30 p.m.
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Florida Atlantic University
777 Glades Road, EW 187
Boca Raton Campus
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DEPARTMENT: Ocean and Mechanical Engineering
CHAIR OF THE CANDIDATE’S PH.D. COMMITTEE: Hassan Mahfuz, Ph.D.
PH.D. SUPERVISORY COMMITTEE:
Manhar R. Dhanak, Ph.D.
Javad Hashemi, Ph.D.
Francisco Presuel-Moreno, Ph.D.
Masahiro Takanahi, Ph.D.
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ABSTRACT OF DISSERTATION
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A comprehensive study was performed to overcome the design issues related to Ocean Current Turbine (OCT) blades. Statistical ocean current models were developed in terms of the probability density function, the vertical profile of mean velocity, and the power spectral density. The models accounted for randomness in ocean currents, tidal effect, and ocean depth. The proposed models gave a good prediction of the velocity variations at the Gulf Stream.
A novel procedure was developed to couple Fluid-Structure Interaction (FSI) with blade element momentum theory. The proposed FSI analysis predicted a power loss of 3.1 % due to large deflection of the OCT blade. The method contributed to saving extensive computational cost and time compared to a CFD-based FSI analysis.
The random ocean current loadings were calculated by considering the ocean current turbulence, wake flow behind the support structure, and velocity shear. Fatigue tests of GFRP coupons and composite sandwich panels under such random loading were performed. Fatigue life increased by a power function for GFRP coupons and by a linear-log function for composite sandwich panels as the mean velocity decreased. To accurately predict the fatigue life, a new fatigue model based on the stiffness degradation was proposed. Fatigue life of GFRP coupons was predicted using the proposed model, and a comparison was made with experimental results.
As a summary, a set of new design procedures for OCT blades has been introduced and verified with various case studies of experimental turbines.
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BIOGRAPHICAL SKETCH
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- Born in Japan
- B.S. 2009, Tokyo Institute of Technology, Japan
- M.S. 2011, Tokyo Institute of Technology, Japan
- Researcher 2011, IHI Corporation, Japan
- Ph.D. 2017, Florida Atlantic University, Boca Raton, Florida
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CONCERNING PERIOD OF PREPARATION & QUALIFYING EXAMINATION
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Time in Preparation: 2015 — 2017
Qualifying Examination Passed: Fall 2015
Selected Published Papers:
T. Suzuki, H. Mahfuz, and M. Canino, Resource Characterization and Statistical Modeling of Ocean Current at the Gulf Stream, Marine Technology Society Journal, vol. 51, no. 1, pp. 52-63, January 2017.
T. Suzuki and H. Mahfuz, Analysis of Large-Scale Ocean Current Turbine Blades using Fluid-Structure Interaction and Blade Element Momentum Theory, Ships and Offshore Structures (Under 2nd Review).
T. Suzuki, H. Mahfuz, and M. Canino, Fatigue Load and Life Estimation of Composite Turbine Blades under Random Ocean Current, Proceedings of OCEANS 2015 - MTS/IEEE Washington, Washington D.C., USA, October 2015.
T. Suzuki and H. Mahfuz, Non-Linear Modeling of Ocean Current Turbine Blades under Large Deflection, ASME 2016 International Mechanical Engineering Congress and Exposition, Phoenix, Arizona, USA, vol. 6B: Energy, November 2016.
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777 Glades Road, EE 308, Boca Raton, FL 33431-0991•
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