Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel

Shen, Xinmin; Bai, Panfeng; Yang, Xiaocui; Zhang, Xiaonan; To, Suet

doi:10.3390/app9071507

Cited by 27 publications

(34 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, when the frequency range was 100-2000 Hz, the absolute value and relative percentage of improvement of the theoretical average sound absorption coefficient fell from 0.3690 and 247.76% to 0.1050 and 15.44% respectively with thickness of the polyurethane foam increased from 10 mm to 40 mm. The major reason for this phenomenon was that sound absorption performance of the polyurethane foam in the entire frequency range was raised when its thickness rose, which was consistent with normal absorption property of the porous material [15][16][17]31,33,35]. Comparisons of theoretical data, simulation data, and experimental data of the sound absorption coefficients of the composite sound-absorbing structure are shown in Figures 9 and 10 respectively.…”

Section: Optimal Structural Parametersmentioning

confidence: 66%

“…According to these optimal structural parameters of the composite sound-absorbing structures obtained in Section 2.2.2, finite element simulation of the sound absorption property of the composite structure was conducted in the virtual acoustic laboratory [28][29][30][31], and the constructed simulation model is shown in Figure 3. The size of the standing wave tube was 60 mm × 60 mm × 300 mm, and its front surface was treated as the acoustic source inlet for transmission of the incident sound wave.…”

Section: Finite Element Simulationmentioning

confidence: 99%

“…Afterwards, identification of acoustic characteristic parameters of the polyurethane foam and optimization of structural parameter of the composite structure were realized through the cuckoo search algorithm [24][25][26][27]. Later, the composite structure was verified by the finite element simulation method [28][29][30][31] and validated through the standing wave tube measurement [32][33][34][35]. Finally, the accuracy of identified acoustic characteristic parameters of the polyurethane foam and effectiveness of improved sound absorption performance of the composite structure were proved.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel

et al. 2020

Self Cite

View full text Add to dashboard Cite

Sound absorption performance of polyurethane foam could be improved by adding a prepositive microperforated polymethyl methacrylate panel to form a composite sound-absorbing structure. A theoretical sound absorption model of polyurethane foam and that of the composite structure were constructed by the transfer matrix method based on the Johnson–Champoux–Allard model and Maa’s theory. Acoustic parameter identification of the polyurethane foam and structural parameter optimization of the composite structures were obtained by the cuckoo search algorithm. The identified porosity and static flow resistivity were 0.958 and 13078 Pa·s/m2 respectively, and their accuracies were proved by the experimental validation. Sound absorption characteristics of the composite structures were verified by finite element simulation in virtual acoustic laboratory and validated through standing wave tube measurement in AWA6128A detector. Consistencies among the theoretical data, simulation data, and experimental data of sound absorption coefficients of the composite structures proved the effectiveness of the theoretical sound absorption model, cuckoo search algorithm, and finite element simulation method. Comparisons of actual average sound absorption coefficients of the optimal composite structure with those of the original polyurethane foam proved the practicability of this identification and optimization method, which was propitious to promote its practical application in noise reduction.

show abstract

Section: Optimal Structural Parametersmentioning

confidence: 66%

Section: Finite Element Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Besides these common porous sound-absorbing materials [1][2][3][4][5], some novel sound absorbers have already been developed from the standard porous metal [6][7][8][9][10][11][12][13][14][15]. Bai et al [6] had attempted to improve sound absorption efficiency of the porous metal by compression, and further promote the sound absorption performance by microperforation [7].…”

Section: Introductionmentioning

confidence: 99%

“…Otaru et al [10] proposed and optimized the porous metal with a bottleneck-type structure, which obtained the the optimal sound absorption performance when its porosity was 0.68. Meanwhile, the composite structures consisted of porous metal and the other sound-absorbing materials are treated as an effective method to develop the practical acoustic absorbers for some normal or special applications [11][12][13][14][15]. Lu et al [11] had investigated influences of the microperforated panel combination on the sound absorption performance of the nickel foam, which indicated that the sound absorption coefficient was controlled by adjusting the thickness of the composite layer and location of the perforated panel.…”

Section: Introductionmentioning

confidence: 99%

Identification of Acoustic Characteristic Parameters and Improvement of Sound Absorption Performance for Porous Metal

Yang

Shen

Duan

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

Porous metal is widely used in the fields of sound absorption and noise reduction, and it is a critical procedure to identify acoustic characteristic parameters and to improve sound absorption performances. Based on the constructed theoretical sound absorption model and experimental data, acoustic characteristic parameters of the porous metal were identified through the cuckoo search identification algorithm, and their reliabilities were certified through comparing with these labeled parameters and further experimental validation. By adding the microperforated metal panel in front of the porous metal, a composite sound-absorbing structure was formed, which aimed to improve the sound absorption performance of the original porous metal by optimizing the parameters. Finite element simulation and a standing wave tube measurement were conducted to validate the effectiveness and practicability of the optimal composite sound-absorbing structure. Consistencies among theoretical predictions, simulation results, and experimental data proved the effectiveness of the identification and optimization method. When the target frequency ranges were 100–1000 Hz, 100–2000 Hz, 100–3000 Hz, and 100–4000 Hz. Actual average sound absorption coefficients of the optimal composite structures were 0.5154, 0.6369, 0.6770, and 0.7378, respectively, which exhibited the obvious improvements with a tiny increase in the occupied space and a small addition in weight.

show abstract

Additively Manufactured Deformation‐Recoverable and Broadband Sound‐Absorbing Microlattice Inspired by the Concept of Traditional Perforated Panels

Zhai

2021

Advanced Materials

View full text Add to dashboard Cite

unattended to, prolonged exposure leads to acute and chronic health hazards and complications such as hearing loss, cardiovascular diseases, cognitive impairment, etc. [1] Sound absorbing materials hence find widespread adoption in a diverse range of applications. For reference, the market value for acoustic materials has been constantly increasing and it is projected to be 16 billion U.S. dollars in 2025, nearly doubling that in 2015. [2] Traditional and commercial sound absorbers in the market have always been focused on foams, fibrous materials, fabric, and perforated panels. [3] However, limitations of the traditional absorbers exist, for instance, such as non-optimal designs, lack of structural rigidity, and health hazards (from synthetic fibers), etc. As such, increasing research efforts have been placed on the investigations of new materials and new meta-structures for novel and better performing sound absorbers. [4] Several examples of new materials investigated as sound absorbers include graphene-based foams, [5] shape memory foams, [6] window foams, [7] and aerogels. [8] However, material-based absorbers compare generally pale in performance to structure-based ones under similar specifications (e.g., thickness, target frequency). Further, such materials also usually lack the rigidity of structures and some may also pose potential health hazards. In turn, structure-based absorbers are more robust and notable successes have been achieved with superior absorption capabilities and broadened absorption range shown. Examples of novel absorbing structures investigated include the Fabry-Perot channel assembly, [9] planar coiled tubes, [10] perforated composite resonators, [11] membrane structures, [12] and shrinking duct structures, [13] etc. Despite the success, the mentioned examples nonetheless are still limited to a structural level-they lack the design flexibilities for an overall system or product.As such, it would be of high research interests to design absorbers based on the principles of structural designs, but yet to down-scale them to a size domain in the range of materials. The advent of additive manufacturing (AM) in the recent years has brought about such possibilities. Apart from being an effective rapid-prototyping tool and a viable manufacturing Noise pollution is a highly detrimental daily health hazard. Sound absorbers, such as the traditionally used perforated panels, find widespread applications. Nonetheless, modern product designs call for material novelties with enhanced performance and multifunctionality. The advent of additive manufacturing has brought about the possibilities of functional materials design to be based on structures rather than chemistry. With this in mind, herein, the traditional concept of perforated panels is revisited and is incorporated with additive manufacturing for the development of a novel microlattice-based sound absorber with additional impact resistance multifunctionality. The structurally optimized microlattice presents excellent broadband absorption with a...

show abstract

Low Frequency Sound Absorption by Optimal Combination Structure of Porous Metal and Microperforated Panel

Cited by 27 publications

References 33 publications

Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel

Improving and Optimizing Sound Absorption Performance of Polyurethane Foam by Prepositive Microperforated Polymethyl Methacrylate Panel

Identification of Acoustic Characteristic Parameters and Improvement of Sound Absorption Performance for Porous Metal

Additively Manufactured Deformation‐Recoverable and Broadband Sound‐Absorbing Microlattice Inspired by the Concept of Traditional Perforated Panels

Contact Info

Product

Resources

About