Solve the problem of the bullet train making a loud noise
An engineer was able to solve the problem of the loud and loud noise of a metro train (the Japanese bullet train) after he was inspired by a bird..
The shape of the bird was used to improve human technology. When the Japanese Shinkansen train, known as the bullet train, reached a speed of 200 miles per hour, it would create a very loud Sonic Boom every time it entered a tunnel, so that people living 15 miles away could hear it. This loud sound, and the reason for this sound is the front of the train, which is not smooth enough, so it draws with it a large amount of air, which is strongly compressed the moment it enters the tunnel, resulting in that loud sound!
Engineers proposed several designs to improve the aerodynamics of the train, and the best of them was a design proposed by one of the engineers after observing a kingfisher diving vertically into the water to catch fish without causing any disturbance to the surface of the water, despite its movement from one medium to another medium of different density, which means that the shape of its beak It provided a very high flow rate that allowed the difference in density to be overcome. After the engineers copied the structural structure of the beak and applied it to the front of the train, its noise decreased significantly, its speed increased by 10%, and its electricity consumption decreased by 15%.
Source: websites