装备外壳结构周期设计及其振动特性

发布时间：2018-02-13 22:53

本文关键词： 声子晶体能带结构设计周期圆柱壳振动特性　出处：《国防科技大学学报》2017年04期 　论文类型：期刊论文

【摘要】：将声子晶体能带理论应用于装备外壳结构设计,把装备外壳圆柱壳段设计成周期结构。基于多子结构的双协调自由界面模态综合法,计算并对比了周期圆柱壳与非周期圆柱壳对弯曲振动的衰减特性。结果表明,周期圆柱壳中有弯曲振动强衰减带隙存在,而非周期结构中则没有带隙存在。进一步研究了轴向周期复合夹层材料圆柱壳的弯曲振动特性。同样,该周期复合夹层结构中依然有弯曲振动带隙存在,且在带隙频率范围内弯曲振动传播将受到明显的抑制。最后,考虑实际装备外壳形状,研究了含周期结构圆柱段的复杂装备外壳振动特性。研究表明,经过局部周期设计的复杂装备外壳保持了带隙特性,这说明了将能带理论应用于工程实际装备外壳的振动控制具有可行性。
[Abstract]:The phonon crystal band theory is applied to the design of the shell structure of the equipment, and the cylindrical shell segment of the equipment shell is designed into a periodic structure. The attenuation characteristics of bending vibration of periodic cylindrical shells and aperiodic cylindrical shells are calculated and compared. The results show that there is a strong attenuation band gap in periodic cylindrical shells. But there is no band gap in aperiodic structures. The bending vibration characteristics of cylindrical shells with axially periodic composite sandwich materials are further studied. Similarly, there is still a band-gap in the periodic composite sandwich structures. In addition, the bending vibration propagation in the band gap frequency range will be restrained obviously. Finally, considering the shape of the actual equipment shell, the vibration characteristics of the complex equipment shell with periodic structure are studied. The characteristic of band gap is maintained in the case of complex equipment which is designed by local period, which shows that it is feasible to apply the energy band theory to vibration control of the shell in engineering practice.
【作者单位】：海军工程大学动力工程学院;海军工程大学舰船动力工程军队重点实验室;武汉理工大学能源与动力学院;
【基金】：国家自然科学基金资助项目(51306205,11372346,51202404)
【分类号】：O327;TH122

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