| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 102 === By adopting a wave energy converter (WEC) with double-hinged flappers and adjustable connections, the kinematic behaviors and performance of the WEC with or without PTO (Power Take Off) connection were investigated with laboratory set-ups. Two analysis methods were applied including a image processing scheme with a camcorder for angular motions of the WEC, and the wave measurement system for evaluating wave energy loss from coefficients of reflection and transmission.
Image results show that the maximum angle of the WEC without PTO occurred in the case with adjustable hinge at the fourth connection, followed by that at the third one. The maximum angle of the WEC with PTO occurred in the case with adjustable hinge at the third connection, followed by that at the fourth one. Comparisons between those of single-hinged and of double-hinged flappers have illustrated the best enhancement of rotating angle to be the case with adjustable hinge at the fourth connection by 46.55% without PTO, and the one at the third connection by 17.75% with PTO.
Wave measurements show that waves with longer periods had caused higher reflection. Without PTO, lowest reflection occurred in the case with adjustable hinge at the third connection, and lowest transmission occurred at the fifth connection. With PTO, lowest reflection occurred in the case with single hinge, but transmission is similar in all the cases. Derived from calculating coefficients of reflection and transmission, the WEC with or without PTO had similarly shown the highest energy loss to be in the case at the fifth connection. From point view of energy transferring closely related angular motions, the best performance occurred in the case with adjustable hinge at the fourth connection without PTO, and with PTO the best case was that at the third connection.
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