Smart material is the focusing point of material sciences and the foundation of technology and engineering of next century. The rare earth giant magnetostrictive material is one of the smart materials. The external pressure exerted induces a magnetic field, which can be picked up by surrounding coils to insert into electric signals. Or it can change its shape under the influence of the magnetic field that is generated by the electric signals in the surrounding coils. In other words, the smart material can produce a sensor-actuator intelligent system.

Compared with other sensor devices, the giant magnetostrictive system has obviously advantage, and most important of all, it's smart. Firstly, its core can accept a maximum compressive stress of more than 700Mpa, that is to say, it can be applied to withstand heavy load. Secondly, because of the superior performance of the smart material, it can produce large motion, high power output, high rate of energy transformation, short response time under the influence of magnetic field, the sensor actuator intelligent system responses rapidly and exactly. Moreover, the simplified one-body entity (sensing-actuating) plays an important role in the development of modern industry. Undoubtedly, along with the development of automation, the giant magnetostrictive sensor-actuator intelligent system will be applied to as many fields as imaginable in the near future.

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