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基于声学黑洞效应的直升机驾驶舱宽带降噪
引用本文:王小东,秦一凡,季宏丽,陆洋,裘进浩. 基于声学黑洞效应的直升机驾驶舱宽带降噪[J]. 航空学报, 2020, 41(10): 223831-223831. DOI: 10.7527/S1000-6893.2020.23831
作者姓名:王小东  秦一凡  季宏丽  陆洋  裘进浩
作者单位:1. 南京航空航天大学 航空学院 机械结构力学及控制国家重点实验室, 南京 210016;2. 南京航空航天大学 航空学院 直升机旋翼动力学国家级重点实验室, 南京 210016
基金项目:国家自然科学基金;装备预研项目;江苏高校优势学科建设工程项目;江苏省自然科学基金
摘    要:声学黑洞(ABH)效应是利用结构阻抗的变化,使结构中传播的波相速度和群速度发生变化,在结构局部区域实现波的聚集,进而通过少量阻尼将能量耗损。该方法具有高效、轻质、宽频等优点,为结构振动噪声控制提供了新的思路,具有较强的潜能和应用前景。本文针对直升机驾驶舱复杂的噪声问题,根据噪声源和传递路径,提出基于ABH效应的内嵌式和附加式2种减振降噪设计方案。利用有限元软件建立了结构声振耦合模型,分析了直升机驾驶舱模型的声振特性,解释了ABH效应有助于降低舱室噪声的机理,并搭建了实验平台,开展了效果测试和性能评估。结果表明,内嵌式ABH结构可以有效降低舱内的中高频噪声,而低频控制能力略显不足。附加式ABH结构可以弥补这一局限性,拓宽有效频带。结合内嵌式和附加式ABH 2种控制方案,相比传统结构在总质量不增加甚至略有降低的前提下,舱室平均噪声水平在1/3倍频程内降低3~10 dB。该研究成果有助于推进ABH新技术在未来直升机工程减振降噪中的应用。

关 键 词:声学黑洞  降噪  宽频  直升机  舱内噪声  
收稿时间:2020-01-13
修稿时间:2020-04-13

Broadband noise reduction inside helicopter cockpit with acoustic black hole effect
WANG Xiaodong,QIN Yifan,JI Hongli,LU Yang,QIU Jinhao. Broadband noise reduction inside helicopter cockpit with acoustic black hole effect[J]. Acta Aeronautica et Astronautica Sinica, 2020, 41(10): 223831-223831. DOI: 10.7527/S1000-6893.2020.23831
Authors:WANG Xiaodong  QIN Yifan  JI Hongli  LU Yang  QIU Jinhao
Affiliation:1. State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. National Key Laboratory of Rotorcraft Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract:Acoustic Black Hole (ABH) effect allows alteration of the phase velocity and group velocity of wave propagation in a structure by changing the impedance to concentrate the waves in local areas of the structure and dissipate energy with a little damping. With the advantages of high efficiency, light weight, and wide frequency, the ABH provides a new perspective for structural vibration and noise control, exhibiting strong potential and application prospects. To reduce the broadband noise inside helicopter cockpits, this paper presents two kinds of structural design schemes based on the ABH effect after considering noise sources and transmission paths. The coupling model of the helicopter cockpit is established using the finite element software. The vibro-acoustic characteristics are then analyzed, and the mechanism of the ABH induced cabin noise reduction is explained. The effect test and performance evaluation are carried out on the established experimental platform. Results show that the embedded ABH structure can effectively reduce the medium-high frequency noise inside the cockpit, while its insufficient performance on low frequency noise is compensated by the additional ABH structure, therefore widening the effective frequency band. The average noise level can be reduced by 3-10 dB in the one-third octave band after employing both the embedded ABH and the additional one. Moreover, the total mass is slightly decreased compared with the traditional structure. This research contributes to the application of ABH new technology to vibration and noise reduction of helicopter engineering in the future.
Keywords:acoustic black hole  noise reduction  broadband  helicopter  cabin noise  
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