Sustainable sound absorbers from fruit stones waste

Borrell, J.M. Gadea; Sanchís, Emilio; Alcaraz, Jorge Gabriel Segura; Belda, Isaac Montava

doi:10.1016/j.apacoust.2019.107174

Cited by 19 publications

(7 citation statements)

References 26 publications

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“…The sound absorption coefficient (α) increased as the thickness increased. Borrell et al [112] investigated the sound absorption coefficient (α) of four types of fruit stone wastes (cherry, apricot, peach, and olive). The sound absorption coefficient (α) was dependent on the shape and size of the fruit stones.…”

Section: Wood Barkmentioning

confidence: 99%

Sound Absorbing Properties of Selected Green Material—A Review

Jang

2023

Forests

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Noise pollution is often overlooked and invisible, but it significantly impacts the quality of human life. One of the most straightforward solutions to mitigate noise pollution is by using sound-absorbing materials. Recently, research trends to develop sound absorbing green materials, typically derived from agricultural by-products, have witnessed an uptick. This paper summarizes the sound-absorbing properties of various green materials found in the literature, including coconut fiber, kenaf fiber, rice bran, rice husk, rice straw, Hanji (a traditional Korean paper), tea-leaf fiber, mandarin peel, pineapple-leaf fiber, corn husk, peanut shell, sugar palm trunk, yucca gloriosa fiber, fruit stones, wood barks, flax fiber, and nettle fiber. Natural fibers can be made by compressing the raw material or manufacturing them into fibrous materials or composites. The key variables that determine sound absorption performance are the thickness and density of the green material, as well as the presence of an air back cavity. Generally, thicker materials exhibit better sound absorption performance in the low- and mid-frequency range. Moreover, higher density is associated with better sound absorption performance at the same thickness. Additionally, increasing the distance between the sound-absorbing material and the air back cavity enhances sound absorption performance at low frequencies. Thus, these physical variables, rather than the specific materials used, primarily influence sound absorption capabilities. Therefore, various green materials, such as fibers, granules, and porous materials, can be effective sound absorbers if their thickness, density, and air back cavity are properly controlled.

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Section: Wood Barkmentioning

confidence: 99%

Sound Absorbing Properties of Selected Green Material—A Review

Jang

2023

Forests

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“…The sound absorption coefficients of the high-frequency region showed that the number of peaks increased as the height of the cubes filled in the impedance tube increased. This phenomenon is because as the height of the cubes increases, there is more space for the sound waves to penetrate, which is a typical sound absorption curve of a granular type sound absorbing material (Borrell et al, 2020).…”

Section: Scanning Electron Microscopy (Sem) Imagesmentioning

confidence: 99%

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes

Jang¹

2022

J. Korean Wood Sci. Technol.

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Today, commercialized Hinoki cypress cubes are used for fragrance, humidification, and pillows in Korea. In this study, the sound absorption ability of Hinoki cypress (Chamaecyparis obtusa) cubes was examined. The three groups of Hinoki cypress cubes were prepared depending on their dimension (L: 9 × 9 × 9, M: 7 × 7 × 7, S: 4 × 4 × 4 mm). Their sound absorption coefficient was examined after filling 6, 8, 10, and 12 cm height in impedance tubes, respectively. Overall, the sound absorption ability depending on dimension was superior in the M group compared to the L and S groups. Also, as the filling height increased, the sound absorption capacity increased. In sum, noise reduction coefficients (NRC) of all Hinoki cypress cubes were 0.41-0.59. Thus, this research found that Hinoki cypress cubes have a sound-absorbing function.

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“…Examples of composites made with recycled materials that have been researched include: polyethylene, wastepaper, cardboard, and wool fibers bound with glue [7]; polyurethane foam waste [8]; recycled tires [9]; recycled fiberglass with a biobased binder [10]; rubber, plastic, wood, and fabric wastes bound with glue and adhered to various typical backing panels such as plasterboard [11]; polystyrene and sawdust bound with an acrylic binder [12]; and even used cigarette filters [13]. Examples of composites made with natural and renewable materials that have been researched include; cotton, sisal, flax, ramie jute, and wool fibers [14]; hemp fiber and concrete composite materials [15]; rice paddy fibers bound with a methylcellulose binder [16]; natural kenaf fibers [17]; coconut, and cane (among others previously mentioned) [18]; raw, heat-compressed oil palm fibers [19]; corn husks [20]; fruit pits [21]; and myriad other agricultural byproducts [22]. Significant among these previous examples is that nearly all researchers relied on synthetic adhesives and glues to bind fibers together; the fibers are typically being used as a means of lightening or replacing other materials within a composite matrix.…”

Section: Overview Of Non-conventional Acoustical Materialsmentioning

confidence: 99%

A design framework for absorption and diffusion panels with sustainable materials

Dessi-Olive¹,

Hsu²

2021

inter noise

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Architectural acoustics has not traditionally had unified design methods that specify acoustical performance, visual appearance, and sustainable material selection, leading to underperforming products that contribute to a waste stream of petro-chemical foam and fiberglass materials. The evolution of design, materials, and manufacturing techniques in recent years has created new opportunities to reimagine acoustic diffusers and absorbers. Previous work by the authors have demonstrated a unifying framework for design and collaboration in architectural acoustics. The framework uses visually-driven computational design method inspired by shape grammars that generate a wide range of acoustic phase grating diffuser arrays that display unique visual and performative qualities. Simulation and evaluation metrics to assess the complexity of each design are rated in terms of their diffusion and absorption coefficients and a visual aesthetic coefficient. This paper extends the framework to include digital fabrication protocols and sustainable material specifications - including the use of fungi-based materials. Built prototypes demonstrate an expanded acoustic design space that gives acousticians the potential to create custom diffuser shapes with precise acoustical response. The innovative combination of computational design methods and sustainable fabrication protocols will be discussed, and the acoustic properties of arrays will be evaluated and compared to simulations of corresponding designs.

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Sustainable sound absorbers from fruit stones waste

Cited by 19 publications

References 26 publications

Sound Absorbing Properties of Selected Green Material—A Review

Sound Absorbing Properties of Selected Green Material—A Review

Investigation of Sound Absorption Ability of Hinoki Cypress (Chamaecyparis obtusa) Cubes

A design framework for absorption and diffusion panels with sustainable materials

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