Use wave power to ride more comfortable boats

Marine experiment using a full-length 3.3m small vessel

Sink test for sink test. On the left is a dramatic reduction in swing when implementing ceiling control

The University of Tokyo and Management Planning announced on April 27, 2016 that it has developed a small vessel that can absorb wave energy while improving ride comfort. When using a full-length 3.3m small ship that can take two people to carry out an offshore experiment, it successfully absorbed about 70% of the wave energy in a sea area with a height of 0.2m, and reduced the shaking of the cabin to less than 1/4 of the original. . According to reports, the product's productization issues have set goals.

The structure of the small ship developed this time is to equip the cabin with a suspension device only on the left and right floats. The wave-bearing buoy will produce up and down undulations and pitching movements, and the cabin will also swing with it, this time to rely on this movement to drive the motor and generator, thereby obtaining electricity. At the same time, since the swaying energy is converted into electricity, the swing of the cabin is also reduced.

The ratio of absorbing wave energy and improving ride comfort can also be adjusted as needed. When the power generation is maximum when the cabin is oscillated by resonance, and when the motor and generator are driven at a sensor-measured level of swing of the cabin, the cabin is spatially fixed (skyshaft control), making the ride comfortable. Have been greatly improved.

The researchers produced a scaled experimental boat with a total length of 1.6m and implemented a tank model experiment. The results showed that the optimized combination of various factors such as vessel indices performed well and would enter 150 waves of energy within the width of the float. When more than % is converted into electricity, the ups and downs caused by the waves are reduced to less than half of the wave height. When converted into a small-scale fishing boat with a total length of 8m using a similar law, about 30% of energy can be saved in the whole year.

Then, in December 2015, the researchers launched a small 3.3-meter-long vessel for marine experiments and conducted a marine experiment at Shimodang on the side of the Sea of ​​Japan at Yuguwan. In addition, in order to normalize the state of the sea in the area, universal data were obtained. An empirical test was also conducted on the experimental ship using the wave shape of the JONSWAP (North Sea Wave Research Joint Program) tank, confirming that the marine experimental data is applicable to any sea area. .

The results of this study are expected to be widely used in a variety of vessels, such as fishing boats that require reduced energy consumption, work boats that are particularly important for mitigation measures, and yachts. (Special Contributor: Kudosuke)

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