acoustical performance
Coconut Fiber Panel towards Acoustical Performance
... The evidence from this study suggests that the most suitable sample that can be used as an acoustic panel is S3 which is the CSM coconut fiber filled with PU sample which have 0.75 of the absorption coefficient value ...
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Influence of physical properties on the acoustical performance of the oil palm frond natural fibre
... Most of available sound absorbing materials are fibrous materials. Conservatively, synthetic fibres such as fibreglass, glass wool or rock wool are chosen as raw materials for common acoustic manufacturing. These ...
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Acoustical performance and physical properties of nonwoven fibre; Arenga Pinnata (Ijuk) and natural rubber composite
... Referring to that, values of porosity is inversely proportional to the ratio of natural rubber mixed with ArengaPinnata fibre. Where, 100:0 of samplein the highest value of porosity. High porosity value indicates that ...
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Evaluating Acoustical Performance of Several Churches in Jordan
... the acoustical performance, and enhance it in three different churches in Amman – Jordan (Lutheran Good Shepherd Church, Roman Catholic Church, Sacred Heart of Jesus ...
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Adjustable acoustical performance based on deformable origamic shapes: a preliminary experimental investigation
... Abstract. This paper describes a preliminary investigation on the possible use of deformable origamic shapes as a technique to provide adjustable acoustical performance in multi-purpose hall. The term ...
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Comparative study on acoustical performance and occupants' satisfaction between green office buildings and conventional office buildings in Malaysia
... the acoustical performance of green office buildings in Malaysia, as well as the occupants’ satisfaction; and compare with that of conventional office buildings in Malaysia was ...significant ...
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Acoustical Performance of Pure Reactive Muffler with Central Inlet and Central Outlet Configuration
... acoustic performance of a simple Expansion chamber Muffler for different dimensions by taking same ...acoustic performance was ...acoustic performance of ...
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Measurement of the acoustical performance of traditional vernacular mosques in Malaysia
... Data collected reveals initial findings that the operating facilities in the mosques resulting higher rating of noise criteria which is reducing the performance of speech intelligibility[r] ...
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Acoustical characteristics of oil palm Mesocarp fibres
... The use of adhesive or binder to produce porous absorber is not a new method. Many studies have shown the incorporation of binder such as polyurethane, polyester, latex, epoxy, urea formaldehyde, phenol formaldehyde, ...
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Acoustical Characteristics of One Novel Reactive Muffler with the Vortex Shaped Expansion Chamber
... the acoustical performance and reduce the installation volume of muffler, one novel perforated reactive muffler is proposed, in which vortex-shaped expansion chamber is ...the acoustical ...
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Acoustical Properties of Winged Fibers.
... Acoustical performance is measured by a set of experimentally determined constants like sound absorption coefficient (NAC), reflection co-efficient, acoustic impedance, normal reduction coefficient (NRC) ...
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Acoustical Transmission Loss Performance By Using Various Absorptive Material
... The acoustical performance of duct with the variation of number of baffle plate, with and without of absorptive material, with and without effect of perforation, with the percentage variation of flow ...
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Effect of Scoria on Various Specific Aspects of Lightweight Concrete
... Some modified types of concrete under thermomechanical loadings have been developed (De Sa et al. 2006; Burlion et al. 2005). The selection of materials is essential from the acoustical point of view. Materials can ...
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Acoustical properties of double porosity granular materials
... In this paper, the acoustical properties of double poros- ity granular materials, i.e., packings of porous particles, are investigated both theoretically and experimentally. The pa- per is organized as follows. In ...
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Acoustical characteristics of oil palm Mesocarp
... Regarding to environmental concerns, researchers have now driven their concern to find the replacement or renewable materials instead of producing acoustical panel using non-renewable materials. There are several ...
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Some Aspects of Analysis of Dolphins’ Acoustical Signals
... dolphin’s acoustical signals have been reg- istered mainly incorrectly (inadequate band of frequen- cies and levels of records that lead to clipping and distor- tion of a signal’s waveform; random position of a ...
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Acoustical Analysis of a Desktop Personal Computer System
... This review of literature will provide background information regarding the following: previous work done in the areas of understanding the noise generation mechanisms of axial-flow fa[r] ...
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Acoustical Imaging in Heterogeneous Environments
... The first model (1a) suggests that some inhomogeneous layer is placed between array (for example 2D matrix array in general case) and target; but array and target themselves are placed in uniform medium. Very often such ...
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Study of Electronic, Acoustical and Elastic properties of CdCe
... Elastic, acoustical and electronic properties of CdCe have been performed using the full-potential augmented plane-waves + local orbital (FP-LAPW + lo) ...ratio, acoustical velocities for longitudinal and ...
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Acoustical properties of lightweight concrete from scoria
... Acoustical characterization: The sound absorption coefficient has always been considered as one of the most important physical parameters needed for the evaluation of acoustical efficiency. Its ...
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