【作者】 姚政成； 刘献栋； 鲍岳； 胡学满； 单颖春； 何田；

【Author】 Yao Zhengcheng;Liu Xiandong;Bao Yue;Hu Xueman;Shan Yingchun;He Tian;School of Transportation Science and Engineering,Beihang University;

【机构】 北京航空航天大学交通科学与工程学院；

【摘要】 螺旋弹簧是汽车结构路噪的重要传递路径之一,为提升螺旋弹簧的宽频减振性能,本文引入了声学黑洞和局域共振超材料对弹簧结构进行概念设计。首先提出声学黑洞式螺旋弹簧和突变型声学黑洞式螺旋弹簧结构,与普通弹簧的传递响应性能进行对比,证明了新型结构优异的减振性能,并通过响应云图和功率流分布揭示了声学黑洞效应与周期性阻抗失配的减振改进机理。此外,本文对附加圆柱型局域共振单元的螺旋弹簧结构进行研究,通过传递响应、振子能量比、响应云图讨论了结构的特性与振子的耦合机理,并对不同形状振子的性能进行研究。本研究可为声学黑洞和局域共振超材料在汽车结构中的应用以及螺旋弹簧的减振研究提供参考。更多还原

【Abstract】 Helical spring is one of the important transmission paths of structural road noise of automobiles.In order to improve the wide frequency attenuation performance of helical spring,acoustic black holes( ABHs) and locally resonant metamaterials are introduced to cany out conceptual design of the spring structures.The helical spring structure in the shape of ABH and mutant ABH are firstly proposed,and the transmission performance of the new structure is compared with that of the ordinary spring,and the excellent vibration damping performance is proved.The response cloud and power flow distribution images show that the improved mechanism is the ABH effect and periodic impedance mismatch.In addition,the helical spring structures with additional cylindrical locally resonant units are studied.The characteristic and the coupling mechanism between the structures and the vibration units are discussed by the transmission,energy ratio and response cloud pictures,then the properties of different shapes of units are studied.This study can provide references for the application of ABH and locally resonant metamaterials in automotive structures and the study of vibration reduction of helical springs.更多还原