CAJ | 학술논문

将声子晶体思想引入串联组合杆结构，构造二组元声子晶体串联组合杆结构。采用传递矩阵法对其进行理论分析及数值计算，并通过有限元仿真验证理论分析结果。对给定的减振要求进行遗传算法最优化求解。研究表明，由于面内、外振动耦合作用，在杆件结合处声子晶体串联组合杆能实现波型转换，弯曲、纵向、扭转带隙可同时被利用，可获得三维宽频减振能力；各子杆间夹角对减振性能有显著影响，可利用遗传算法对所需带隙范围进行声子晶体串联组合杆夹角最优化设计；加载角对各夹角组合形式的声子晶体串联组合杆减振性能影响规律类似，即加载角为0°或90°时该结构减振能力明显优于其它加载情况。
장성자정체사상인입천련조합간결구，구조이조원성자정체천련조합간결구。채용전체구진법대기진행이론분석급수치계산，병통과유한원방진험증이론분석결과。대급정적감진요구진행유전산법최우화구해。연구표명，유우면내、외진동우합작용，재간건결합처성자정체천련조합간능실현파형전환，만곡、종향、뉴전대극가동시피이용，가획득삼유관빈감진능력；각자간간협각대감진성능유현저영향，가이용유전산법대소수대극범위진행성자정체천련조합간협각최우화설계；가재각대각협각조합형식적성자정체천련조합간감진성능영향규률유사，즉가재각위0°혹90°시해결구감진능력명현우우기타가재정황。
A kind of serial combined rod of phononic crystals (SCRpc )was proposed,introducing the thought of phononic crystals into the design of combined rods in series.Transfer matrix method was used in theoretical analysis, numerical solutions and optimal calculation of vibration transmissibility were put forward and further simulations proceeded by using finite element software.The results show that:a SCRpc which can realize the wave type transformation may make good use of bending,longitudinal and torsional band gaps,due to the effect of coupled in-plane and out-of-plane vibration at the junction of rods,to achieve three-dimensional and broadband vibration suppression.The intersecting angles of SCRpc have significant impacts on the performance of vibration reduction.According to the need of stop band,the optimal design of intersecting angles of SCRpc can be conducted by using genetic algorithm.Loading angles have the similar influence on the vibration suppressing of serial combined rods with various combinations of intersection angles,i.e.the attenuation performance of the 0 or 90 degrees case is much better than that of others.