The vibration proof study of the periodical rod with the strengthened interfaces

If two or more kinds of elastic materials are arranged periodically in 1D, 2D, or 3D, a phononic crystal is realized. Similar to the electromagnetic wave propagation in a photonic crystal, the phononic crystal also has the property of phononic band gap for the sound or mechanical wave. That is, certain frequency band of sound or mechanical wave cannot pass the phononic crystal. It is believed that the phononic crystal can be used as widely as photonic crystal. The Transfer Matrix Method, finite element method and experiment are used to study the vibration proof property of a rod like 1D phononic crystal. To improve the bound strength between different materials, we designed a new structure with covers at the joints. The computational results show that such a structure still has the band gap whose width is three times wider, and the frequency range of wave will be minimized. The work in the paper explores the engineering application of the functional phononic crystals, and prepares the theory and the experiment for the design and analysis of more complicate phononic band gap structures.