## 3 Experimental Results and Discussion  
The number of rotations and the torque were measured in real time when the load torque for control was given in order to check the output and control status of the dynamo PTO system. These measurements were converted to calculate the generated power for comparison. Figure 6 plots the real-time characteristics of the generated power for regular wave case RE 1, which exhibited the largest variation of the number of rotations of the main axis and the highest generated power among the regular waves. Figure 6 shows the real-time output during five wave periods of the incident wave when the mechanical load torque of 0.0231 Nm was burdened by the servo motor. The power generated by a regular wave presents characteristics resulting from the combination of the outputs produced by both the horizontal cylinder and swing plate within the period (2.742 s) of the incident wave. The curve of the generated power exhibits repeatedly the continuity of the incident wave period. The power generated by the common attenuator, which converts directly the energy of the wave, displays zero twice within the incident wave period, but the output of the proposed hybrid wave energy converter approaches zero only once for the regular wave. The high power generated around 1/4 period and 3/4 period indicates that the swing plate of the hybrid wave energy converter generates maximum kinetic energy at wave crest and wave trough during one period of the regular wave. At 1/2 period, when the swing plate does not produce energy due to the change in the direction of its motion, the generated power exceeds 30 W owing to the action of the horizontal cylinder which exploits the circular motion and have motion of the incident wave. This result demonstrates that the clutch gears adopted in this study enable to combine smoothly and continuously the electric powers generated by the horizontal cylinder and swing plate. The draft of the horizontal cylinder could be easily adjusted by a mechanism where the main supporting structure acts as the pivot of a seesaw with the horizontal cylinder at one end and an added mass at the other end. This seesaw did not affect the power generation when the incident wave turned from crest to trough but made the generated power close to zero when the incident wave turned from trough to crest. For the regular wave cases, the number of rotations (RPM) of the wave energy converter exhibited periodic continuity and stable power generation with very small variability in each period. The load torque remained practically constant, which advocates the possibility for stable power generation adapted to the incident wave characteristics by the proposed hybrid wave energy converter. Figure 5: Measured wave height data: (**a**) regular wave case; (**b**) irregular wave case. A series of tests were conducted for nine load torques of the servo motor ranging between 0 and 0.385 Nm, namely 0.0 Nm, 0.0077 Nm, 0.0231 Nm, 0.0385 Nm, 0.0771 Nm, 0.1542 Nm, 0.2313 Nm, 0.3084 Nm and 0.3855 Nm, to evaluate the CWR of the hybrid wave energy converter for regular wave conditions. Figures 7 and 8 plot, respectively, the mean power and instant maximum power generated during 2 min under regular wave condition. Higher power appears to have been generated at load torques below 0.0771 Nm, whereas the generated power seems to experience a significant reduction beyond 0.0771 Nm. Moreover, the highest power generation occurred for regular wave case RE 1, with the shortest period and the generated power decreasing with longer periods of regular waves. It is noteworthy that the minimum power generation occurred for regular wave case RE 3. Considering that the proposed hybrid converter is purposed to be installed in a marine environment at depths no greater than 5 m, the wave conditions to be met will mostly correspond to regular wave cases RE 1 and RE 2. Consequently, the proposed hybrid wave energy converter appears to be the most suited for nearshore application, as targeted in its development.