People always say that “after the Yangtze River pushes waves,†it seems that Hou Lang’s “strength†is definitely greater than before. Such as the tsunami, but the latest research results of Fudan University not only as people explain this common sense issue. As a matter of fact, the waves have risen from the moment until they are calm. No matter how many roads the waves take, the energy contained in them will not be attenuated. In other words, whether it is an ordinary storm wave or a tsunami wave, the length cycle of the wave will not reduce its energy.
Moreover, the school’s achievements have also introduced another remarkable achievement. The research team and his collaborators led by Prof. Hu Xinhua from the school’s Advanced Materials Laboratory found that a periodic array of low-frequency resonators can completely block the water waves. This blocking process translates into electricity, even if it is a tsunami. It may also become energy for power generation.
The water wave has two characteristics: First, it is a kind of mechanical wave with gravity as the restoring force, that is, if there is no gravity, the water wave is impossible to spread, which is why there is no water wave in space, even if it is a small one. In the cup, the water has always been calm and there will be no turbulence. Another feature is that water waves propagate on the surface of water. The average wind wave cycle is 1 second to 25 seconds. The tsunami wave cycle is longer and the cycle is 10 minutes to two hours. The general wind wave is the wave caused by the wind blowing water, and the tsunami is the water rising from the sea floor or rolled down from the sea to form a wave, and causing the entire water body to vibrate.
Professor Hu Xinhua and his collaborators have discovered that a periodic array produced by a low-frequency resonator can completely block the long waves that ordinary people think can't be blocked. As a result of the study, it was found that when the frequency of the water wave is near the resonator frequency, the resonator array completely reflects the water wave and causes the resonator to move up and down. This strong reflection dramatically changes the wave energy absorption efficiency of the resonator.
Hu Xinhua introduced that the so-called resonator is a kind of slotted pipe. It is different from a solid one. It is hollow, and there are some seams in the pipe wall. These resonators are arranged in an array and they are Below the resonator there are special devices that can float up and down. When the frequency of the water wave and the frequency of the resonator are the same, it can efficiently absorb the wave energy and convert the mechanical energy into electrical energy. These specially designed devices can be used to extract wave energy in the future and become the core components of wave power plants.
Compared to wind energy that we are familiar with, the wave energy is 1000 times that of water because the density of water is 1000 times that of air, so the density of energy is also 1000 times that of wind power generation, and the energy density in wave energy is higher. However, Professor Hu Xinhua said that the disadvantage of this field is that the testing and R&D costs of wave energy are much higher than wind energy.
Because the frequency of waves is very wide, there are various wavelengths. Just like sunlight, the spectrum of light contains visible parts. This means that resonators of various frequencies are needed. If you want to use tsunami waves to generate electricity, When the tsunami is at a wavelength of 500 kilometers in the open sea and a wavelength of 1 to 2 kilometers in the open sea, to stop the tsunami, the resonator must be very large.
The research team has already tried to place resonator arrays in some sea areas and found that in addition to generating power, the resonator array has the additional effect of blocking waves and forming a relatively quiet water behind the array. Fish can Which quickly reproduce. However, at present, it is difficult to apply it to the development of fisheries.
It is hoped that the school will continue to tackle difficult topics and develop better equipment as soon as possible, not only turning waste into treasure, but also playing a good role in preventing disasters so that fewer people can avoid harm.
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