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Numerical Study on Cause and Characteristics of Low-Frequency Yaw Motion of a Slack-Moored FOWT
Get PDFSlack-moored floating offshore wind turbines (FOWTs) may experience low-frequency motions. In fact, in the Fukushima demonstration FOWT project, low-frequency motions were observed not only in storms but also in relatively calm sea states. Low-frequency motions could cause damages to the slack-mooring system and the power cables that transmit electricity generated by the turbine. Furthermore, the low-frequency motion in yaw could cause damages to the connection part of the nacelle and the tower. Suppressing low-frequency yaw motion requires an accurate understanding of the cause and the characteristics of the motion. To do so, numerical simulation of a slack-moored 15 MW FOWT has been conducted in two or three wave components. The results indicate that the low-frequency yaw motion and resonance could occur at various frequencies.World Conference on Floating Solutions WCFS2023 Japan
Tokyo, Japan
28th-29th August, 202
Application of radical polymerization using alkylboranes as initiators to thermosetting resins
Get PDF横浜国立大学博士（工学
Prediction of low-cycle fatigue damage of sputtered Cu thin films using deep convolutional neural network
Get PDF横浜国立大学博士（工学
Elucidation of lithium ion transport mechanism and rational design for highly Li-ion conducting liquid electrolytes
Get PDF横浜国立大学博士（工学
An Improvement of Surge Voltage and Efficiency in Three-Phase Inverter by Using Fully Digital Active Gate Control
Get PDFThis paper presents a control method of fully digital active gate drivers to simultaneously realize surge voltage reduction and efficiency enhancement in a three-phase inverter for motor drive applications. Generally, the surge voltages of power devices in each switching are affected by the operation principle of the three-phase current values and phases. In the proposed method, the active gate driving patterns of fully six gate drivers are suitably changed according to the phase angle of the three-phase current to minimize the highest surge voltage and the switching loss in a fundamental period. A prototype of the three-phase inverter using a 6-in-1 SiC power module and six digital active gate driver ICs was developed to verify the improvement effect of the proposed active gate control. It was experimentally shown that the surge voltage could be reduced from 418.6 V to 369.4 V, fixing a high efficiency.Conference Location: Orlando, FL, US
