基于声学黑洞效应的直升机驾驶舱宽带降噪

doi:10.7527/S1000-6893.2020.23831

Abstract

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.

Key words: acoustic black hole, noise reduction, broadband, helicopter, cabin noise

CLC Number:

V214.3⁺3

WANG Xiaodong, QIN Yifan, JI Hongli, LU Yang, QIU Jinhao. Broadband noise reduction inside helicopter cockpit with acoustic black hole effect[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(10): 223831-223831.

References

[1] LU Y, WANG F J, MA X J. Helicopter interior noise reduction using compounded periodic struts[J].Journal of Sound and Vibration, 2018, 435:264-280.
[2] KRYLOV V V. New type of vibration dampers utilising the effect of acoustic ‘black holes’[J].Acta Acustica United with Acustica, 2004, 90(5):830-837.
[3] KRYLOV V V. Acoustic black holes:Recent developments in the theory and applications[J].IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014, 61(8):1296-1306.
[4] TANG L L, CHENG L, JI H L, et al. Characterization of acoustic black hole effect using a one-dimensional fully-coupled and wavelet-decomposed semi-analytical model[J].Journal of Sound and Vibration, 2016, 374:172-184.
[5] KRYLOV V V, WINWARD R. Experimental investigation of the acoustic black hole effect for flexural waves in tapered plates[J].Journal of Sound and Vibration, 2007, 300(1):43-49.
[6] O'BOY D J, KRYLOV V V, KRALOVIC V. Damping of flexural vibrations in rectangular plates using the acoustic black hole effect[J].Journal of Sound and Vibration, 2010, 329(22):4672-4688.
[7] CONLON S C, FEURTADO P A. Progressive phase trends in plates with embedded acoustic black holes[J].The Journal of the Acoustical Society of America, 2018, 143(2):921-930.
[8] LI X, DING Q. Analysis on vibration energy concentration of the one-dimensional wedge-shaped acoustic black hole structure[J].Journal of Intelligent Material Systems and Structures, 2018, 29(10):2137-2148.
[9] 邓杰, 郑玲, 左益芳, 等. 声学黑洞梁的振动能量分布探讨[J].噪声与振动控制, 2018, 38(S1):66-70. DENG J, ZHENG L, ZUO Y F, et al. Exploration of energy distribution in acoustic black hole beams[J].Noise and Vibration Control, 2018, 38(S1):66-70(in Chinese).
[10] HUANG W, JI H L, QIU J H, et al. Wave energy focalization in a plate with imperfect two-dimensional acoustic black hole indentation[J].Journal of Vibration and Acoustics, 2016, 138(6):061004.
[11] HUANG W, JI H L, QIU J H, et al. Analysis of ray trajectories of flexural waves propagating over generalized acoustic black hole indentations[J].Journal of Sound and Vibration, 2018, 417:216-226.
[12] BOWYER E P, KRYLOV V V, O'BOY D J. Damping of flexural vibrations in rectangular plates by slots of power-law profile[C]//Acoustics 2012. Nantes:French Acoustical Society, Institute of Acoustics and European Acoustics Association, 2012:2187-2192.
[13] BOWYER E P, O'BOY D J, KRYLOV V V, et al. Experimental investigation of damping flexural vibrations in plates containing tapered indentations of power-law profile[J].Applied Acoustics, 2013, 74(4):553-560.
[14] FEURTADO P A, CONLON S C. Wavenumber transform analysis for acoustic black hole design[J].The Journal of the Acoustical Society of America, 2016, 140(1):718-727.
[15] MA L, CHENG L. Sound radiation and transonic boundaries of a plate with an acoustic black hole[J].The Journal of the Acoustical Society of America, 2019, 145(1):164-172.
[16] BAYOD J J. Application of elastic wedge for vibration damping of turbine blade[J].Journal of System Design and Dynamics, 2011, 5(5):1167-1175.
[17] BOWYER E P, KRYLOV V V. Damping of flexural vibrations in turbofan blades using the acoustic black hole effect[J].Applied Acoustics, 2014, 76(1):359-365.
[18] 贾秀娴, 杜宇, 于野, 等. 声黑洞理论应用于板类结构的轻量化减振分析[J].振动工程学报, 2018, 31(3):434-440. JIA X X, DU Y, YU Y, et al. Application of controlling of vibrations in plate structures using the acoustic black hole theory[J].Journal of Vibration Engineering, 2018, 31(3):434-440(in Chinese).
[19] 何璞,王小东,季宏丽,等. 基于声学黑洞的盒式结构全频带振动控制研究[J].航空学报, 2020, 41(4):223350. HE P, WANG X D, JI H L, et al. Full-band vibration control of box-type structure with acoustic black hole[J].Acta Aeronautica et Astronautica Sinica, 2020, 41(4):223350(in Chinese).
[20] JI H L, WANG X D, QIU J H, et al. Noise reduction inside a cavity coupled to a flexible plate with embedded 2-D acoustic black holes[J].Journal of Sound and Vibration, 2019, 455:324-338.
[21] WANG X D, JI H L, QIU J H, et al. Wavenumber domain analyses of vibro-acoustic decoupling and noise attenuation in a plate-cavity system enclosed by an acoustic black hole plate[J].The Journal of the Acoustical Society of America, 2019, 146:72-84.
[22] 王三平, 熊峻江, 尚大晶,等. 直升机抗噪声疲劳设计中的噪声测量[J].直升机技术, 2000, 123(3):1-8. WANG S P, XIONG J J, SHANG D J, et al. Noise measurement in the antifatigue design of helicopter noise[J].Helicopter Technique, 2000, 123(3):1-8(in Chinese).
[23] 陆洋, 马逊军, 王风娇. 直升机舱内噪声主动控制技术研究[J].航空制造技术, 2016, 59(8):38-45. LU Y, MA X J, WANG F J. Review of active techniques for helicopter interior noise control[J].Aeronautical Manufacturing Technology, 2016, 59(8):38-45(in Chinese).
[24] TANG L L, CHENG L. Enhanced acoustic black hole effect in beams with a modified thickness profile and extended platform[J].Journal of Sound and Vibration, 2017, 391:116-126.
[25] CONLON S C, FAHNLINE J B, SEMPERLOTTI F. Numerical analysis of the vibroacoustic properties of plates with embedded grids of acoustic black holes[J].The Journal of the Acoustical Society of America, 2015, 137(1):447-457.
[26] CHENG L, NICOLAS J. Radiation of sound into a cylindrical enclosure from a point-driven end plate with general boundary conditions[J].The Journal of the Acoustical Society of America, 1992, 91(3):1504-1513.

Broadband noise reduction inside helicopter cockpit with acoustic black hole effect

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