Experimental study on sound absorption performance of microperforated panel with membrane cell

Enhancing of broadband sound absorption through soft matter

“…The development of metamaterials provides new possibilities for designing low-frequency sound-absorbing structures with sub-wavelength thicknesses, such as resonant membrane-type, [10][11][12] labyrinth, [13][14][15] Helmholtz resonant cavity, 16,17 Fabry-Pe ´rot cavity, 18 and slit structures, 19 as well as secondary structures based on these forms. [20][21][22][23][24][25][26] In summary, there are generally three ways to broaden the absorption bandwidth. The first and most commonly used method is through the parallel-type synergetic among multiple weakcoupling units with gradient parameter distribution.…”

“…10,26 The third method involves parallel-type synergistic coupling between different types or multi-scaled soundabsorbing structures, where each type or scale absorbs sound waves in a specific frequency band to achieve the superposition of different absorption bands. 18,20,24,25 The structure size in the thickness or in-plane directions should increase correspondingly to broaden the low-frequency absorption bandwidth using these methods. Therefore, achieving broadband sound absorption remains a challenge for space-constrained applications.…”

Influence of Surface Discontinuity on Sound Absorption Coefficient of Vehicle Interior Material

“…A compound micro perforated panel absorber array adopting the seriesparallel coupling manner is proposed by Qian et al [19]. Gai et al [20] performed experimental study on sound absorption performance of microperforated panel with membrane cell. Recently, Shen et al [21] develop a thin sound absorber consisted of multilayer compressed porous metal with rear cavity.…”

A Parametric Study of the Acoustic Performance of Resonant Absorbers Made of Micro-perforated Membranes and Perforated Panels

“…Depending on the resonance system, single-leaf perforated panel absorbers always have a limited frequency band, showing only one sharp-narrow absorption peak. Many researchers proposed the use of more complex perforated absorbers, including multi-layer systems [28], three-dimensional (3D) micro-perforated panels [29], combinations of micro-perforated panels with membranes [30,31], arranging the parallel micro-perforated panel absorbers with different cavity depths [32], or combining perforated panels with micro-perforated partitions [33], to achieve a wider absorption band. Sakagami and colleagues studied the theory behind the acoustical property of multi-leaf membranes [34], double-leaf micro-perforated panel [35], their combinations [26,31], and the combination with porous materials [36].…”