Oblique incidence sound absorption of a hybrid structure using a micro-perforated panel and a planar actuator

Liu, Yang; Zhang, Yanni; Chen, Kean; Ma, Xiyue

doi:10.35848/1882-0786/ab7f17

Cited by 10 publications

(8 citation statements)

References 33 publications

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“…2(a)]. According to the previous studies, 9,28) they are the first six coupled structural modes, i.e. the (1,1), (1,3), (3,1), (3,3), (1,5) and (5,1) plate modes.…”

mentioning

confidence: 94%

“…the (1,1), (1,3), (3,1), (3,3), (1,5) and (5,1) plate modes. The first three coupled modal frequencies are shifted 9,27) visibly to higher frequencies (60 Hz, 80 Hz and 100 Hz, respectively) compared with the uncoupled modal frequencies of the plate 16 Hz, 69 Hz and 92 Hz, respectively), due to the added stiffness of the shallow cavities on the plate. While other three AC peaks (140 Hz, 175 Hz and 245 Hz, respectively) locates near the natural frequencies (146 Hz, 176 Hz and 246 Hz, respectively) of the (3,3), (1,5) and (5,1) PA plate mode, respectively.…”

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confidence: 97%

“…Due to these reasons, the applications for hybrid passive-active structures were limited. In a recent study by the present authors, 9) a hybrid structure using the controlled structuralacoustic coupling was established to realize 3D absorption. As was shown in the previous study, this hybrid solution is qualified to achieve excellent performance while holding advantages of small thickness, lightweight and simple actuation.…”

mentioning

confidence: 99%

“…The vibration of the MPP is neglected in the analytical cases below since it only affects few frequencies near the modal resonances. 9,24) Firstly, a 1D study is conducted as a reference. In this case, the hybrid structure is mounted at one end of an impedance tube with the same cross-sectional area ( ´= ĺ l 0.5 0.6…”

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confidence: 99%

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A near-field vector sensing strategy for three-dimensional large-scale hybrid sound absorption

Liu¹,

Chen²,

Zhang³

et al. 2021

Appl. Phys. Express

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A near-field vector sensing (VS) strategy is developed for three-dimensional (3D) large-scale hybrid sound absorption based on a lightweight structure. By simultaneously detecting sound pressures and normal particle velocities at discrete positions on the absorbing surface, the reflected sound power is minimized to obtain the optimal secondary excitation. For the one-dimensional case, low-frequency quasi-perfect absorption could be realized by one-point VS. For the 3D case (at the incident angle of 20°), the optimized two-point VS is able to realize commendable broadband absorption from 50 to 800 Hz and extraordinary absorption between 50 and 300 Hz.

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“…2(a)]. According to the previous studies, 9,28) they are the first six coupled structural modes, i.e. the (1,1), (1,3), (3,1), (3,3), (1,5) and (5,1) plate modes.…”

mentioning

confidence: 94%

mentioning

confidence: 97%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

A near-field vector sensing strategy for three-dimensional large-scale hybrid sound absorption

Liu¹,

Chen²,

Zhang³

et al. 2021

Appl. Phys. Express

Self Cite

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“…[26,27] Some tunable mechanisms, mainly employing the mechanical deformations, piezoelectric, and/or magnetic effects, have been presented. [28][29][30][31][32][33] However, they generally require rigid backings to impede sound transmissions, which forbid the transmission of fluids, such as air and water. The absorption of a ventilated acoustic metamaterial composed of subwavelength scatters is usually much smaller compared with its reflection.…”

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confidence: 99%

Automatically Adaptive Ventilated Metamaterial Absorber for Environment with Varying Noises

Tian

et al. 2021

Adv Materials Technologies

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thickness, health and environment issues, fire resistance, moisture resistance, and durability issues. [1][2][3][4] In the past two decades, varieties of artificial structures, collectively called "acoustic metamaterials," have been designed to manipulate sound waves beyond natural limits. [5][6][7][8][9][10][11][12][13] For example, low-frequency (<500 Hz) sound waves have strong penetration ability, long propagation distance, and low attenuation coefficient, hence it is still a great challenge to deal with low-frequency noises. [1,3,4,14] In the last decade, diverse sound-absorbing metamaterials in subwavelength scales have been designed, which generally increase the density of states at targeted low-frequencies in the metamaterials in order to enhance the dissipation of sound energy. [15][16][17][18][19][20][21][22][23][24][25] However, for most acoustic metamaterials, their targeted frequencies and operating functions can hardly be adjusted after being fabricated. It is hence an intrinsic barrier for their applications in scenarios where the frequencies of noise can change over time.To overcome this stringent barrier, tunable acoustic metamaterial absorbers have been proposed and investigated in recent years. [26,27] Some tunable mechanisms, mainly employing the mechanical deformations, piezoelectric, and/or magnetic effects, have been presented. [28][29][30][31][32][33] However, they generally require rigid backings to impede sound transmissions, which forbid the transmission of fluids, such as air and water. The absorption of a ventilated acoustic metamaterial composed of subwavelength scatters is usually much smaller compared with its reflection. It is a challenge to break the limit and finally achieve a tunable absorber with simultaneously good absorption and ventilation at low frequencies. [33] Besides, their intricate mechanical, electronic, and magnetic structures are inconvenient and may be unstable for daily applications. [34,35] Moreover, previously designed adjustable metamaterial absorbers could not automatically perceive incident sound to realize intelligent adjustment and absorption. [21,[36][37][38][39][40][41][42][43] A simpler, more adjustable, and more automatic scheme is eagerly needed.Here, we demonstrate an automatically adaptive ventilated metamaterial absorber (AAVMA) for low-frequency sound that can achieve high-efficiency (>90%) absorption for onesided incidence with frequency varying in the working range. The ventilated absorber can automatically monitor the environmental noise and intelligently adjust the sound absorption An automatically adaptive metamaterial sound absorber is designed, which can absorb tunable low-frequency (<500 Hz) sounds under ventilated conditions by designing a feedback circuit to actively detect the noise signals and adjust the sliders on the reconfigurable absorbers. The automatically adaptive ventilated absorber provides an intelligent route to adapt for different low frequencies, through adjusting the sound absorption units directly in accordance with the...

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Experimental Investigation into the Acoustic Black Hole Vibrating Absorbing Effect and Its Automotive Applications

Zhang,

Tong,

Huang

et al. 2024

Lecture Notes in Mechanical Engineering

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Oblique incidence sound absorption of a hybrid structure using a micro-perforated panel and a planar actuator

Cited by 10 publications

References 33 publications

A near-field vector sensing strategy for three-dimensional large-scale hybrid sound absorption

A near-field vector sensing strategy for three-dimensional large-scale hybrid sound absorption

Automatically Adaptive Ventilated Metamaterial Absorber for Environment with Varying Noises

Experimental Investigation into the Acoustic Black Hole Vibrating Absorbing Effect and Its Automotive Applications

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