Our buildings are get taller and taller. If the building high enough, the people on the top of the building will feel the swaying of the building when the wind is strong.
Wind Damper. A metal ball in the tall building. It can reduce the sway greatly. Without it, you may be afraid of being on the top of buildings.
The most important part is the metal ball. They can weigh hundreds of tons in some buildings.
The principle of the device is that a detector outside the building measures the wind. And it will sent a signal to a specialized computer. Then, the computer will forecast the sway of the building will be and control the ball to sway in the opposite direction to neutralize the oscillation. So the buildings only sway slightly.
Most skyscrapers in the world have install this kind of equipments. Next time you visit a skyscraper, you can take a look at the device.
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