“…In this study, it was aimed to study the acoustical properties of DBP rugs in, so the condition and materials for preparing samples were selected the same as Sadeghi-Sadeghabad, Alamdar-Yazdi. 35,36,37 Moreover, the used yarns are of common yarn types for producing the conventional rugs which are available in the markets. Besides, the ranges for density and thickness are selected based on the practical condition and conventional rugs.…”
Section: Methodsmentioning
confidence: 99%
“…Double Base Persian rug samples with different base structure were produced in such that the base warp yarns were divided into two groups and placed on two plates with a distance of 1 mm from each other as shown in Figure 2. 35 Spacer bar with 1 mm diameter is placed between two bases to ensure the distance of 1 mm between them (Figure 2). As a result, the thickness of the base in the new rug has been increased compared to the conventional one, which in turn it has increased the base specific volume and improved its mechanical properties.Figure 2.Schematic structure of DBP rug.…”
The purpose of this study is to investigate the role of density and pile height on sound absorption coefficient in Double Base Persian (DBP) rug and possibility of prediction the acoustic behavior of DBP rug using the mathematical model. For this aim, in the first step, three double base rug samples were produced at different base densities (2, 4, and 6 warp yarn/cm) and the sound absorption coefficient of samples was measured with Impedance tube in two thicknesses (15 & 13 mm) to study the pile height effect. Moreover, the sound absorption of the double base zone was also measured by shaving off the pile from the double base rug samples. Three rug samples at different base densities were produced with very thin warp and weft yarns to avoid the base effect in this sample. Besides, the macroscopic empirical model (Johnson–Champoux–Allard (JCA)) was implemented on obtained data. The results showed that the sound absorption of the double base rug samples increases with increasing the pile height and base density. The role of the base zone in the sound absorption of the rug is bolder than the pile zone. What leads to improve the rug sound absorption by increasing density is increasing the sound absorption of base zone and the pile density changes do not play a major role in increasing the rug sound absorption. In addition, by assuming DBP rugs as a two-layer porous (pile + base zone) absorber, JCA model shows a good consistency with experimental data.
“…In this study, it was aimed to study the acoustical properties of DBP rugs in, so the condition and materials for preparing samples were selected the same as Sadeghi-Sadeghabad, Alamdar-Yazdi. 35,36,37 Moreover, the used yarns are of common yarn types for producing the conventional rugs which are available in the markets. Besides, the ranges for density and thickness are selected based on the practical condition and conventional rugs.…”
Section: Methodsmentioning
confidence: 99%
“…Double Base Persian rug samples with different base structure were produced in such that the base warp yarns were divided into two groups and placed on two plates with a distance of 1 mm from each other as shown in Figure 2. 35 Spacer bar with 1 mm diameter is placed between two bases to ensure the distance of 1 mm between them (Figure 2). As a result, the thickness of the base in the new rug has been increased compared to the conventional one, which in turn it has increased the base specific volume and improved its mechanical properties.Figure 2.Schematic structure of DBP rug.…”
The purpose of this study is to investigate the role of density and pile height on sound absorption coefficient in Double Base Persian (DBP) rug and possibility of prediction the acoustic behavior of DBP rug using the mathematical model. For this aim, in the first step, three double base rug samples were produced at different base densities (2, 4, and 6 warp yarn/cm) and the sound absorption coefficient of samples was measured with Impedance tube in two thicknesses (15 & 13 mm) to study the pile height effect. Moreover, the sound absorption of the double base zone was also measured by shaving off the pile from the double base rug samples. Three rug samples at different base densities were produced with very thin warp and weft yarns to avoid the base effect in this sample. Besides, the macroscopic empirical model (Johnson–Champoux–Allard (JCA)) was implemented on obtained data. The results showed that the sound absorption of the double base rug samples increases with increasing the pile height and base density. The role of the base zone in the sound absorption of the rug is bolder than the pile zone. What leads to improve the rug sound absorption by increasing density is increasing the sound absorption of base zone and the pile density changes do not play a major role in increasing the rug sound absorption. In addition, by assuming DBP rugs as a two-layer porous (pile + base zone) absorber, JCA model shows a good consistency with experimental data.
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