一种基于时空泵浦的轴管类声子晶体非互易带隙特性研究  

A study on the nonreciprocal band gap characteristics of axial tube phononic crystals based on spatiotemporal pumping

作　　者：卢紫勋 姚凌云[1] LU Zixun;YAO Lingyun(College of Engineering and Technology,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学工程技术学院,重庆400715

出　　处：《振动与冲击》2025年第8期169-174,250,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(52175121)。

摘　　要：针对轴管结构中的单向隔振控制问题,基于绝热演化原理的非互易波导理论,设计一种可产生动态边界的螺旋声子晶体结构,利用其形成的时空泵浦实现轴管中弹性波非互易传输,从而对轴的振动进行单向隔离。该设计采用理论和仿真计算分析周期轴管的能带结构,发现轴管的转动可以使周期结构的能带偏转,其形成的动态边界具有单向泵浦功能,并能通过改变角速度对偏移频率范围进行调谐,当调制速度为10 m/s时,调制率达到15.89%。为验证轴管单向带隙的有效性,对轴管的单向隔振性能进行有限元仿真和试验验证,得到的振幅归一化曲线与非互易带隙偏移特性具有较好的匹配性。结果表明,通过机械装置运动来调制弹性波传播模式是实现轴管结构单向隔振的一种新思路。A spiral phononic crystal structure that can generate dynamic boundaries was designed based on the adiabatic evolution principle of nonreciprocal waveguide theory,which can solve the problem of unidirectional isolation control in shaft tube structures.The spatiotemporal pump formed by this structure was used to achieve nonreciprocal transmission of elastic waves in the shaft tube,which can achieve unidirectional isolation of shaft vibration.Theoretical and simulation calculations were used to analyze the energy band structure of the periodic tube.It was found that the rotation of the tube can deflect the energy band of the periodic structure,and the dynamic boundary formed by it has a unidirectional pumping function.The offset frequency range can be tuned by changing the angular velocity.The modulation rate reaches 15.89%when the modulation speed is 10 m/s.To verify the effectiveness of the unidirectional bandgap of the shaft tube,finite element simulation and experimental verification were conducted on the unidirectional isolation performance of the shaft tube.The amplitude normalization curve obtained has good matching with the nonreciprocal bandgap offset characteristics.The results indicate that modulating the propagation mode of elastic waves through mechanical device motion is a new approach to achieve unidirectional vibration isolation of shaft tube structures.

关 键 词：时空泵浦 非互易带隙 能带偏转 单向隔振 动态边界 

分 类 号：X593[环境科学与工程—环境工程]