周期隔振设计用于直升机舱内噪声抑制的研究  

Reduction of helicopter cabin noise using periodic isolation design

作　　者：宋玉宝[1] 李征初[1] 黄奔[1] 郁殿龙[2] 温激鸿[2] SONG Yu-bao;LI Zheng-chu;HUANG Ben;YU Dian-long;WEN Ji-hong(Laboratory of Aerodynamic Noise Control,China Aerodynamics Research and Development Center,Mianyang 621000,China;Laboratory of Science and Technology on Integrated Logistics Support,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]中国空气动力研究与发展中心气动噪声控制重点实验室,四川绵阳621000 [2]国防科技大学装备综合保障重点实验室,湖南长沙410073

出　　处：《振动工程学报》2020年第4期764-771,共8页Journal of Vibration Engineering

摘　　要：通过对主减速器支撑结构进行周期隔振设计,开展舱内噪声抑制研究。首先,设计了两种周期隔振结构,建立了周期隔振结构的声振分析模型以及作封闭腔体简化的直升机舱室模型;其次,开展了周期隔振结构与均匀连续隔振结构对比研究,分析了周期性设计对隔振结构自身振动传递、单层隔振系统声振响应以及舱内噪声的抑制效果。研究表明:相对于采用非周期隔振设计的情况,周期性设计使结构振动与噪声得到了显著抑制;通过周期隔振结构优化设计,可以在不增加附加质量的情况下,取得更好的减振降噪效果。The noise level inside modern helicopter cabins has become one of the major indices to evaluate its performance.The noise transfer path control is an important approach to reduce the noise in cabin.Gearbox struts are one of the key transfer paths for the noise and vibration inside helicopter cabin.Based on the periodic theory,the isolation structure for gearbox vibration is designed,and the reduction of the cabin noise is studied.Firstly,two types of periodic isolation structures are designed.A single layer vibration isolation system and a simplified cabin model which is considered as a closed cavity are built.Next,the vibration and sound properties of the periodic isolation structure are analyzed and compared.The effect of periodic design on the vibration transmission of the isolation structure,the vibration and noise of the single layer isolation system and the cabin are studied.The numerical results demonstrate that the vibration and noise of these structures are effectively suppressed by periodic design.In addition,via the optimal design of the periodic structure,the vibration and noise can be reduced more,while the added mass is not increased.

关 键 词：噪声控制 直升机 舱内噪声 周期结构 

分 类 号：TB535[理学—物理]