By Rajiv Padhye, Rajkishore Nayak (eds.)
This publication highlights the producing and purposes of acoustic textiles in numerous industries. additionally it is examples from varied industries within which acoustic textiles can be utilized to take in noise and aid decrease the effect of noise on the office. Given the significance of noise relief within the operating surroundings in different industries, the ebook bargains a worthy consultant for firms, educators and researchers concerned with acoustic materials.
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Extra resources for Acoustic Textiles
Two main challenges in the applications of the above-mentioned passive sound control approaches are: low frequency sound control and ventilation requirements. Active noise control is a method of reducing existing noise by the introduction of controllable secondary sources to affect generation, radiation, transmission and reception of the original primary noise source. It can provide better solutions to low frequency noise problems than the current passive noise control methods when there are weight and volume constraints.
Porous absorbers are materials where sound propagation occurs in a network of interconnected pores (open pore structure) in such a way that viscous and thermal effects cause acoustic energy to be dissipated. Air is a viscous fluid, and consequently acoustic energy is dissipated via friction with the pore walls. As well as viscous effects, there will be losses due to the thermal conduction from the air to the absorber material, which might be more signiﬁcant at low frequency. For a porous absorber to create signiﬁcant absorption, it needs to be placed somewhere where the particle velocity is high.
Nayak end, it will compress and elongate along with the force direction. The same thing happens in longitudinal sound wave. Air particles get oscillated back and forth in the direction parallel to the sound wave movement. This create compression and rarefaction waves alternately. Longitudinal waves begin with compression followed by rarefaction. The wavelength can be determined by measuring the distance between two consecutive compressions, or rarefactions. 2 Sound Interference and Doppler Effect When sound waves from two different sources either cancel or superimpose each other’s effect, the phenomenon may be termed as interference .