Design, simulations and experimental research in the process of development of sound absorbing perforated ceiling tile

Kłosak, Andrzej

doi:10.1016/j.apacoust.2019.107185

Cited by 8 publications

(3 citation statements)

References 16 publications

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“…Accordingly, these values are comparatively lower than the results found for the panels in the present study. However, to increase the NRC of the panel, it can be modified, such as with perforated gypsum ceiling panels with weighted sound absorption coefficients of 0.65 and 0.70 for frequencies of 125 to 4000 Hz, depending on the thickness, opening, perforation ratio, type, and location of the porous material (59). Other studies on acoustic panels made from agricultural waste (rice husk, vine pruning, cork, and prickly pear agglomerated with resin) to be used as ceiling tiles showed NRC results close to 0.80 in the frequency range of 200 Hz to 6400 Hz (60).…”

Section: Acoustic Insulationmentioning

confidence: 99%

Eco-efficient thermoacoustic panels made of totora and gypsum for sustainable rural housing ceilings

Huaquisto Cáceres,

Pari Quispe,

Cruz Maron

2023

materconstrucc

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The energy deficiency in rural housing in the Andes of Peru is recurrent. In this context, local and low environmental impact materials present an opportunity. This research evaluated the properties of five panels composed of totora and gypsum for ceiling applications. Firstly, the physical and durability properties were obtained. Then, impact and fire resistance were evaluated. Finally, thermoacoustic properties were assessed. The results showed a moisture level of 10.25%, water absorption of 354.85% which is considered high, and a dry density of 292.84 kg/m3. Adequate durability to fungus with resin on both sides. The panels’ fire resistance is superior to 60 minutes, with a safe impact criterion for 10 N and a functionality criterion for 5 N. The average values for the panels were 0.061 W/m·K for thermal insulation and 0.54 for NRC. Therefore, it is possible to produce an insulating material for thermoacoustic improvement.

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Section: Acoustic Insulationmentioning

confidence: 99%

Eco-efficient thermoacoustic panels made of totora and gypsum for sustainable rural housing ceilings

Huaquisto Cáceres,

Pari Quispe,

Cruz Maron

2023

materconstrucc

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“…Passero and Zannin [5] conducted a field measurement of indoor acoustics in an open office space, including sound pressure level, RT, and speech intelligibility, and their results showed that the separation between working seat panels and the installation of ceilings with high sound-absorbing capacity were necessary conditions for better acoustics. For the classroom, many studies have proposed that a comfortable acoustic environment is highly correlated with users' learning ability [6][7][8]. Ricciardi and Buratti pointed out that being in a noisy environment for a long time has a high correlation with the effect of speech (R 2 = 0.9), indicating that noise will seriously reduce learning ability [9].…”

Section: Introductionmentioning

confidence: 99%

Development of Folded Expanded Metal Mesh with Sound Absorption Performance

2021

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Reverberation time (RT) is an important factor affecting the quality of indoor acoustics. Using sound-absorbing materials is one method for quickly and effectively controlling RT, and installation in the ceiling is a common location. Sound-absorbing ceilings come in many forms, with light steel joist ceilings commonly used in office spaces, classrooms, and discussion rooms. Light steel joist ceilings are often matched with sound-absorbing materials such as gypsum board, mineral fiberboard, rock wool, and coated glass wool, but such materials may have durability and exfoliation problems. Therefore, considering performance and health, in this research, we aimed to design an expanded metal mesh (EMM) structure specimen for sound-absorption material, namely folded expanded metal mesh (FEMM). The results show that the FEMM can significantly improve the sound-absorption performance of the expanded metal mesh. Theof single panel is 0.05–0.35, and theof FEMM is 0.65–0.85. On the other hand, the sound-absorption performance of the full frequency band has been significantly improved. Furthermore, the field validation result shows that RT decreased from 1.05–0.56 s at 500 Hz, meanwhile, the sound pressure level (SPL) is still evenly distributed, and speech clarity (C50) is increased by 5.6–6.5.

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“…The passive noise control technique is the effort to reduce the noise propagation by partially or completely blocking or absorbing the sound waves with noise-insulating materials such as sound-absorbing tiles [9], and noise barriers [10][11][12]. Passive materials achieve noise reduction either through absorption, diffusion, or reflection of sound.…”

Section: Passive Noise Controlmentioning

confidence: 99%

Active control of noise transmitted from barriers

Sohrabi

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Active noise cancellation is a unique approach that helps passive noise control in reducing sound levels at low frequencies; nevertheless, successful use of active noise cancellation necessitates performing numerous and tedious experiments together with defining several parameters properly. The locations and quantity of active control system transducers are among these parameters. The present research provides a comprehensive framework for placing control sources and error microphones near a noise barrier in order to improve its efficiency in both narrowband and broadband noise spectra. To accomplish this, the appropriate locations for the control sources are first determined using a repetitive computation method, and then the optimizations are completed by determining the best position for the error microphone. Several alternative transducer locations near the barrier are incorporated in the repetitive computation, and the optimal sites for the control sources and error microphones are found using two-step optimization methods as well as the genetic algorithms approach. The findings reveal that the best places to put the control sources are on the incident side, below the barrier's edge, and the best locations to place the error microphones are on the shadow side, as close as possible to the target area. The effect of ground reflection on the efficiency of the active noise control system is also investigated, and it is discovered that while ground reflection has no significant effect on the performance of the active noise control system for broadband frequency ranges, it does reduce the control system's efficiency at tonal noises. In order to optimize more parameters, further calculations are performed based on the genetic optimizer. The output of the GA calculations found new configurations for the control units that result in higher noise level reduction at the target area. In addition to the active noise barrier, the application of active noise cancellation for open windows as a particular case of the barrier is explored as a particular case of the barrier. Different arrangements are studied for the control units close to the open windows, including linear, boundary, and planar control arrangements. The effect of several parameters such as the incident angle of noise waves, the distance between error microphones and the opening, and the number of control units are investigated. The results demonstrate that the active noise control system with obliqued linear placements of transducers have higher performance than the other arrangements. Furthermore, when the frequency and incident angle increase, the effectiveness of active noise reduction decreases. La cancelación activa de ruido es un enfoque único que ayuda al control pasivo del ruido a reducir los niveles de sonido a bajas frecuencias; sin embargo, el uso exitoso de la cancelación activa de ruido requiere la realización de numerosos y tediosos experimentos junto con la definición adecuada de varios parámetros. La ubicación y la cantidad de transductores del sistema de control activo se encuentran entre estos parámetros. La presente investigación proporciona un marco completo para colocar fuentes de control y micrófonos de error cerca de una barrera de ruido con el fin de mejorar su eficiencia en espectros de ruido de banda estrecha y banda ancha. Para lograr esto, primero se determinan las ubicaciones apropiadas para las fuentes de control usando un método de cálculo repetitivo, y luego se completan las optimizaciones determinando la mejor posición para el micrófono de error. Varias ubicaciones de transductores alternativas cerca de la barrera se incorporan en el cálculo repetitivo, y los sitios óptimos para las fuentes de control y los micrófonos de error se encuentran utilizando métodos de optimización de dos pasos, así como el enfoque de algoritmos genéticos. Los hallazgos revelan que los mejores lugares para colocar las fuentes de control están en el lado del incidente, debajo del borde de la barrera, y los mejores lugares para colocar los micrófonos de error están en el lado de la sombra, lo más cerca posible del área objetivo. También se investiga el efecto de la reflexión del suelo sobre la eficiencia del sistema de control de ruido activo, y se descubre que si bien la reflexión del suelo no tiene un efecto significativo en el rendimiento del sistema de control de ruido activo para rangos de frecuencia de banda ancha, sí reduce el rendimiento del sistema de control. eficiencia en ruidos tonales. Para optimizar más parámetros, se realizan más cálculos basadosen el optimizador genético. El resultado de los cálculos de GA encontró nuevas configuraciones para las unidades de control que dan como resultado una mayor reducción del nivel de ruido en el área objetivo. Además de la barrera de ruido activa, se explora la aplicación de la cancelación de ruido activa para ventanas abiertas como un caso particular de la barrera. Se estudian cuatro disposiciones para las unidades de control cercanas a las ventanas abiertas. Las unidades de control en una configuración de límite se colocan en el borde de la abertura, mientras que en el control plano, se ubican en la superficie de la abertura. En una configuración de contorno, las unidades de control se colocan en el borde de la abertura, mientras que en un diseño plano, se colocan en la superficie de la abertura. Se investiga el efecto de varios parámetros como el ángulo de incidencia de las ondas de ruido, la distancia entre los micrófonos de error y la apertura, y el número de unidades de control. Los resultados demuestran que el sistema de control de ruido activo con configuración plana tiene un rendimiento más alto que el control de límites. Además, cuando la frecuencia y el ángulo de incidencia aumentan, la eficacia de la reducción activa del ruido disminuye.

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Design, simulations and experimental research in the process of development of sound absorbing perforated ceiling tile

Cited by 8 publications

References 16 publications

Eco-efficient thermoacoustic panels made of totora and gypsum for sustainable rural housing ceilings

Eco-efficient thermoacoustic panels made of totora and gypsum for sustainable rural housing ceilings

Development of Folded Expanded Metal Mesh with Sound Absorption Performance

Active control of noise transmitted from barriers

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