The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement....The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement. The effects on absorption coefficient were systematically assessed. The results show that the sound absorption performance is improved by increasing the sample porosity and/or thickness, and/or increasing the air-cavity thickness. Meanwhile, increasing the temperature gives better acoustic absorption performance in the low frequency range but also lowers the performance in the high frequency range, while double-layer structure enables better acoustic absorption performance.展开更多
Porous fiber materials are the most widely used acoustic absorption materials at present,and they have excellent acoustic absorption performance.This paper uses the finite element method to explore the factors affecti...Porous fiber materials are the most widely used acoustic absorption materials at present,and they have excellent acoustic absorption performance.This paper uses the finite element method to explore the factors affecting the acoustic absorption performance of porous fiber materials,including flow resistance,thickness of the porous fiber material,incidence angle,and back cavity thickness.Due to the complex acoustic absorption mechanism of porous fiber materials,an equivalent fluid model is used to simulate the acoustic absorption properties of the porous fiber materials.The correlation of acoustic absorption performance and the model of the back cavity was analyzed.An impedance tube test was implemented to verify the simulation results.展开更多
基金Projects(51671152,51304153)supported by the National Natural Science Foundation of China
文摘The high-temperature acoustic absorption performance of porous titanium fiber material was investigated in terms of sample thickness, porosity, temperature, air-cavity thickness and double-layer structure arrangement. The effects on absorption coefficient were systematically assessed. The results show that the sound absorption performance is improved by increasing the sample porosity and/or thickness, and/or increasing the air-cavity thickness. Meanwhile, increasing the temperature gives better acoustic absorption performance in the low frequency range but also lowers the performance in the high frequency range, while double-layer structure enables better acoustic absorption performance.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.51505261 and 11672167)the Natural Science Foundation of Shan-dong Province,China(Grant No.ZR2015AM013).
文摘Porous fiber materials are the most widely used acoustic absorption materials at present,and they have excellent acoustic absorption performance.This paper uses the finite element method to explore the factors affecting the acoustic absorption performance of porous fiber materials,including flow resistance,thickness of the porous fiber material,incidence angle,and back cavity thickness.Due to the complex acoustic absorption mechanism of porous fiber materials,an equivalent fluid model is used to simulate the acoustic absorption properties of the porous fiber materials.The correlation of acoustic absorption performance and the model of the back cavity was analyzed.An impedance tube test was implemented to verify the simulation results.
