Construction And Performance Study Of Woven Fabric Sound-absorbing Structures

With the progress of science and technology and the development of social,people put forward more requirements for the functionality of home textiles.Taking curtain as an example,people not only want it to have good shading performance,certain heat insulation function,but also want it to have certain sound absorption and noise reduction function.Compared with rigid materials,fiber materials have the advantages of light weight,low price and easy processing,and have been increasingly used in the field of noise reduction.Textiles have good performance on absorbing high-frequencynoise,but they are not good at absorbing low and medium-frequency noise,and their noise reduction effects have obvious limitations such as thickness dependence.In order to improve the noise reduction performance of textile,it is necessary to study the relationship between its structural factors and noise reduction performance.The noise reduction principle of textile is based on the porous sound absorption mechanism,and its pore structure has an important influence on the sound absorption performance.In this article,the composite structure formed by multi-layer woven fabrics is taken as the research object,and the sound absorption performance of uniform and uneven pore structures formed by multi-layer woven fabrics is investigated,and the relationship between the structural characteristics and sound absorption effects of fiber aggregates especially on absorbing low and medium frequency noise is analyzed.The sound absorption law of multilayer fabric composites was explored,and then an efficient sound absorption structure based on multilayer woven fabrics was constructed.Based on the pore characteristics of woven fabrics,the effects of fiber morphology and fabric structure on the pore characteristics and sound absorption properties of the fabric were analyzed.The sound absorption performance of uneven porous structures formed by the composite of single-layer fabrics with different weaves was investigated.When the layered fabric structure is arranged in order of porosity from small to large in the direction of sound wave propagation and form a gradient structure,the sound absorption effect of the structure is significantly enhanced.The tangential arrangement angle between adjacent fabrics in multi-layer fabrics was changed,resulting in changes in the angle and porosity between the layers of the multi-layer fabric structure.the effect of this change on the sound absorption is investigated.The study found that the change in the angle between the fabrics in the multilayer fabric composite also affects the sound absorption performance of the structure;this change has different degrees of impact on the multilayer fabric composed of different fabric structures,it has a large impact on the plain weave multilayer fabric,while has little effect on honeycomb multilayer fabric.Combined with the resonance sound absorption effect,a single layer of fabric was combined with the air layer,and the effect of the thickness of the air layer and the fabric with different pore characteristics on the sound absorption performance of the structure was investigated.The study found that the addition of an appropriate thickness of the air layer can move the peak of the sound absorption coefficient-frequency curve of the fabric to low and medium frequencies,and greatly improve the sound absorption performance of the fabric.Among them,twill weave fabric and air layer have the best sound absorption performance;A sound-absorbing structure combining two layers of fabric and air layer was constructed to obtain a structure construction method with significant noise reduction effect on low and medium frequencies.The results show that when an appropriate thickness of air layer is left between the two layers of fabric and wall,The effect will be significantly enhanced.