【作者】 冯扬； 赵浩江； 薛闯； 李威；

【Author】 Yang Feng;Hao-Jiang Zhao;Chuang Xue;Wei Li;Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences;Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences;

【机构】 中国科学院长春光学精密机械与物理研究所； 中国科学院大学材料与光电研究中心；

【摘要】 为了抑制支撑杆的低频振动,在保证杆的力承载特性的前提下,在杆内部周期性地附加谐振器,构造出具有低频振动带隙的声子晶体杆。结合考虑结构连续性的改进多目标遗传算法和有限元方法,以带隙频率最低和带隙频率范围最宽为目标,计算并分析了双对称约束下的优化结果。数值算例表明声子晶体杆中存在低频弯曲振动带隙,最低可以在701Hz-773Hz的频率范围内有效抑制振动的传播,验证了提出模型的合理性及有效性。更多还原

【Abstract】 In order to suppress the low-frequency vibration of the supporting rod, resonators were periodically added inside the rod to construct a phononic crystal rod with a low-frequency vibration bandgap under the premise of ensuring the load-bearing characteristics of the rod. Combined with multi-objective genetic algorithm considering the structural continuity and finite element method,the optimization results under the double-symmetry constraint are calculated and analyzed with the lowest bandgap frequency and the widest bandgap frequency range as the objectives. Numerical examples verify the existence of a low-frequency flexural vibration band gap in the phononic crystal rod, which can effectively suppress the vibration propagation, and verify the rationality and effectiveness of the proposed model and method.更多还原