Noise attenuation performance of warp knitted spacer fabrics

2017 ◽  
Vol 89 (3) ◽  
pp. 281-293 ◽  
Author(s):  
Veerakumar Arumugam ◽  
Rajesh Mishra ◽  
Jiri Militky ◽  
Blanka Tomkova
Keyword(s):  
Sound Absorption ◽  
Human Life ◽  
Air Flow ◽  
3D Structure ◽  
Acoustic Properties ◽  
Noise Attenuation ◽  
Spacer Fabric ◽  
Flow Resistivity ◽  
Air Flow Resistivity ◽  
Spacer Fabrics

The development of functional textile structures is important to improve noise attenuation of human life in automotives, residential and occupational environments. In this research, an attempt has been made to find the suitability of three-dimensional (3D) knitted spacer fabrics for sound absorption. Hence, an experimental and analytical investigation on the sound absorption behavior of warp knitted spacer fabrics was conducted. Due to their porous nature, interconnected pores, bulkier and 3D structure, the spacer fabrics have the ability to attenuate more sound energy than conventional materials. This research examined the acoustic properties of spacer fabrics in relation to material parameters such as thickness, density and surface structure and structural characteristics such as massivity, porosity, tortuosity and air flow resistivity. The sound absorption coefficient of the test samples was measured using the impedance tube method by ASTM E-1050 in the frequency range of 50–6400 Hz. The results showed that the acoustic insulation of spacer fabric improves with their thickness and massivity, reduction in their porosity, tortuous path and high air flow resistance. Advance statistical evaluation and two-way analysis of variance is used to analyze the significance of the combined effect of various factors on air flow resistivity and the noise reduction coefficient. These findings are important requirements for the design of spacer fabrics for noise control in the automobile upholstery, buildings, auditoriums, etc.

scholarly journals Studi eksperimental terhadap porositas dan hambat alir udara pada komposit penyerap suara

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Nasmi Herlina Sari ◽  
Jauhar Fajrin ◽  
IGNK Yudhyadi
Keyword(s):  
Experimental Investigation ◽  
Polyester Resin ◽  
Volume Fraction ◽  
Air Flow ◽  
Composite Sample ◽  
Sound Absorber ◽  
Flow Resistivity ◽  
Air Flow Resistivity

In this paper, we present a comprehensive analytical and experimental investigation for the determination of the air flow resistivity and porosity of sound absorber composite. The ratio of the volume fraction of fiber and polyester resin is 15, 25, 35, 55 and 65 (%).The dimensions of the absorbent composite sample are 29 mm x 20 cm (diameter x thickness). Porosity and Air flow resistivity of composites have been investigated. The results showed that the porosity of the composites increased with increasing amount of fiber due to the interface between fiber and resinless dense. In contrast, the air flow resistivity values are lower with a denser resin and fiber interface.

scholarly journals Studi eksperimental terhadap porositas dan hambat alir udara pada komposit penyerap suara

2018 ◽  
Vol 8 (1) ◽  
pp. 35
Author(s):  
N.H. Sari ◽  
J. Fajrin ◽  
I.G.N.K. Yudhyadi
Keyword(s):  
Experimental Investigation ◽  
Polyester Resin ◽  
Volume Fraction ◽  
Air Flow ◽  
Composite Sample ◽  
Sound Absorber ◽  
Flow Resistivity ◽  
Air Flow Resistivity

In this paper, we present a comprehensive analytical and experimental investigation for the determination of the air flow resistivity and porosity of sound absorber composite. The ratio of the volume fraction of fiber and polyester resin is 15, 25, 35, 55 and 65 (%).The dimensions of the absorbent composite sample are 29 mm x 20 cm (diameter x thickness). Porosity and Air flow resistivity of composites have been investigated. The results showed that the porosity of the composites increased with increasing amount of fiber due to the interface between fiber and resinless dense. In contrast, the air flow resistivity values are lower with a denser resin and fiber interface.

scholarly journals Studi eksperimental terhadap porositas dan hambat alir udara pada komposit penyerap suara

2018 ◽  
Vol 8 (2) ◽  
Author(s):  
Nasmi Herlina Sari
Keyword(s):  
Experimental Investigation ◽  
Polyester Resin ◽  
Volume Fraction ◽  
Fibrous Composite ◽  
Air Flow ◽  
Composite Sample ◽  
Sound Absorber ◽  
Flow Resistivity ◽  
Air Flow Resistivity

In this paper, we present a comprehensive analytical and experimental investigation for the determination of the air flow resistivity and porosity of sound absorber composite. The ratio of the volume fraction of fiber and polyester resin is 15, 25, 35, 55 and 65 (%).The dimensions of the absorbent composite sample are 29 mm x 20 cm (diameter x thickness). Porosity and Air flow resistivity of composites have been investigated. The results showed that the porosity of the composites increased with increasing amount of fiber due to the interface between fiber and resinless dense. In contrast, the air flow resistivity values are lower with a denser resin and fiber interface.Keywords: Air Flow Resistivity, Fibrous composite, Porosity, Sound Absorber 

scholarly journals On the influence of the air flow resistivity on the measurement of the dynamic stiffness of underlays for floating floors

Acta Acustica ◽  
2021 ◽  
Vol 5 ◽  
pp. 13
Author(s):  
Martin Schmelzer ◽  
Volker Wittstock ◽  
Heinrich Bietz ◽  
Spyros Brezas
Keyword(s):  
Physical Model ◽  
Dynamic Stiffness ◽  
Air Flow ◽  
Edge Length ◽  
Insulating Materials ◽  
Airborne Noise ◽  
Flow Resistivity ◽  
Air Flow Resistivity

The dynamic stiffness of underlays is a required quantity to predict the reduction of impact and airborne noise transmitted through floating floors. The measurement of the dynamic stiffness is standardized in ISO 9052–1 using a floating floor section of 200 mm edge length. If open pore insulating materials are used for the underlay, the air flow and its flow resistivity have a significant impact on the dynamic stiffness. The standard ISO 9052–1 therefore calculates the dynamic stiffness based on three distinct intervals of the flow resistivity. This contribution analyses and discusses the mathematical origin and practical consequences of these three standardized intervals and proposes an improvement for a revision of the standard. The current physical model is expanded to examine if the results, that are gained from the geometrically reduced systems of the standard, can be transferred to room sized systems.

Classification of soils based on acoustic impedance, air flow resistivity, and other physical soil parameters

1985 ◽  
Vol 78 (3) ◽  
pp. 970-980 ◽  
Author(s):  
M. J. M. Martens ◽  
L. A. M. van der Heijden ◽  
H. H. J. Walthaus ◽  
W. J. J. M. van Rens
Keyword(s):  
Acoustic Impedance ◽  
Air Flow ◽  
Soil Parameters ◽  
Flow Resistivity ◽  
Air Flow Resistivity
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