Paper Title
VIBRATION CHARACTERISTICS OF A TUNABLE METAMATERIAL PLATE INCORPORATING SHAPE MEMORY ALLOY ABSORBERSWITH U-SHAPED CANTILEVER

Abstract
Abstract - Metamaterials are artificial materials with special lattice structural design. Due to their unusual physical and mechanical properties, metamaterials have great potential for related industrial applications. In this study, a tunable metamaterial plate is proposed to achieve structural vibration reduction. A combination of nitinol shape memory alloy (SMA) wire and poly lactic acid (PLA) were used to fabricatethe vibration absorber unit and an aluminum plate with a periodic array of the absorber units adhered on the surface was formedas a metamaterial plate. Comparing with conventional metamaterials with a fixed frequency stopband,the proposed metamaterial plate was able to tune its working frequency by controlling the temperature of the cantilevered SMA wire. The experimental model was constructed to measure the dynamic characteristics of the metamaterials plate by fixing the boundaries around the plate and comparing the results with the finite element analysis. The results show that the frequency stopband can be adjusted by changing the phase state of the shape memory alloy, and the frequency stopband can be adjusted up to about 600 Hz. This metamaterial plate can be configured with different phase state absorbers to obtain multiple frequency stopbands, or to obtain a larger frequency stopband by placing the absorbers at appropriate positions, which is useful for industrial applications in vibration reduction. Keywords - Shape Memory Alloy, Metamaterial Plate, Vibration Absorber, Finite Element Analysis, Frequency Stop band.