According to a recent report by the American Physicists Organization Network, a mathematician from the University of Manchester recently proposed a new theory that uses a device similar to “invisibility clothing†to protect buildings from earthquakes, natural disasters or terrorist attacks. For key buildings such as nuclear power plants, high-voltage cable towers and government offices, this “stealth†will become an important protective measure. Related papers were published in the recently published "Royal Society Journal".
This type of invisibility vest is a kind of stress rubber that hides some of the key parts of the building. The powerful seismic waves generated by the earthquake cannot "see" the building and bypass them, avoiding serious damage. Dr. William Parnell, PhD, of the School of Mathematics at the University of Manchester, said that in recent years scientists have developed a variety of functional cloaks. Their theory focuses on the development of a stealth device that protects buildings and their internal structures in such destructive disasters as vibrations and earthquakes.
This is one of the latest stealthy technologies, which is to make an object almost invisible with respect to a certain kind of wave, whether it is visible light, sound or shock waves. People have long been studying the stealth of objects in the visible light, but few people study the propagation of waves in solids, such as seismic waves, and the latter is very important in many aspects such as building protection.
“We began to study visible light waves five or six years ago. It was only a few years ago that we began to consider other types of waves. The most important ones are sound waves and elastic waves. Elastic waves are formed by the propagation of vibrations in elastic media,†Parnell said. “But a problem with elastic waves is that they are usually not available with natural materials.†New theories have shown that applying a non-linear pre-stressing elastic stress to a natural rubber allows anti-plane elastic waves to bypass the object, ie Waves "invisible" the object, creating a stealth effect.
Parnell explained that this shows that it is indeed possible to control the speed and direction of the propagation of elastic waves. This is very important because researchers hope to guide this wave in a variety of environments, especially in nano-applications. If the theory can be extended to larger objects, it is possible to create a “stealth coat†that can protect the building and its structure, or to protect a particularly important part of its structure. At present, they are also studying more extensive theories and trying to turn these theories into reality. (Chang Lijun)
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