Nonperiodic metamaterials can have better vibration attenuation than periodic metamaterials with properly designed resonator distributions. In this study, we propose optimal design routes for rainbow metamaterials. The rainbow metamaterials are nonperiodic structures that are composed of Π-shaped beams as backbones and attached spatially varying cantilever-mass resonators. The main optimization objective is to obtain good vibration attenuation within frequency of interests. Frequency response functions of the rainbow metamaterials are first calculated by an analytical model that is built on the basis of the displacement transfer matrix method. Two optimization objective functions are developed with the maximum and average receptance values within a prescribed frequency range respectively. The mass of resonators acts as design variables. The objective functions are later solved by virtue of the Genetic Algorithm method. The optimized rainbow metamaterials show good vibration attenuation in the prescribed optimization frequency range.
|Number of pages||8|
|Publication status||Published - 4 Sep 2019|
|Event||14th International Conference on Vibration Problems - Creta Maris' Conference Center , Crete, Greece|
Duration: 1 Sep 2019 → 4 Sep 2019
|Conference||14th International Conference on Vibration Problems|
|Abbreviated title||ICOVP 2019|
|Period||1/09/19 → 4/09/19|