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2014 » Papers » Volume 4 » ANALYSIS ACOUSTIC ABSORPTION CAPABILITY OF INNOVATIVE TEXTILE MATERIALS 1. ANALYSIS ACOUSTIC ABSORPTION CAPABILITY OF INNOVATIVE TEXTILE MATERIALS Authors: Bashkova Galina, Bashkov Aleksandr Volume 4 | DOI: 10.12753/2066-026X-14-273 | Pages: 285-288 | Download PDF | Abstract
Since textile composites are widely used for residential interiors and vehicles there is a need for a comprehensive analysis of their consumer properties and running ability. Methods of analysis will not only design new materials with desired properties but also to use them in the learning of highly qualified professionals who are ready to manufacture and operation of innovative materials. In the article is described a calculated method of determining the acoustic properties of acoustic-absorbing panels with textile materials such as flax knitted fabrics. The proposed methodology is based on the Helmholtz wave equations are applicable when calculating the plane homogeneous absorbers used in all areas, including in the interiors of vehicles. The resulting mathematical formulas allow analyzing the wave resistance - impedance and absorption coefficients for different materials. The dependence of the wave resistance is determined by the structure and physical properties of the porous sound-absorbing material. For fiber main characteristic parameter is the specific aerodynamic resistance which is defined as the differential pressure required blowing the material layer. In this case the acoustic characteristics were presented a function of frequency and specific aerodynamic resistance. Design formulas correspond to honeycomb surfaces. Meanwhile a size of the honeycomb cell of acoustic absorbing panel must be sufficiently small compared with the wavelength. Knitted fabric in this case is the most preferred because mesh of knitted structure is more relief than on the weaving fabric. The multi-axis orientation of fragments of honeycomb extinguishes prevents standing waves and resonance condition. In addition, flax fiber is a part of a textile structure has a higher absorption coefficient than the synthetic or glass fiber.
The dependences obtained are confirmed by experimental data which gives an indication of their suitability to predict the acoustic properties of the designed fabric. The proposed method is realized in a mathematical system MatLab. | Keywords
fiber-reinforced composites; honeycomb; acoustic impedance |
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