论文部分内容阅读
对常用的各向同性吸声材料,建立了无限大吸声板时的声压反射系数方程,以平均反射系数最小为目标,优化求解吸声板的平均声反射系数,研究表明:在法向声阻抗匹配下,0-π/2入射范围内平均反射系数并非最小值,而是在表面阻抗为ρc,对应全吸收入射角为62.5°时,全角度上的平均声反射系数最低;如果表面阻抗的最优值为1.35ρc,对应全吸收入射角为42°时,在0-π/3上平均声反射系数可小至0.07。该研究对建筑吸声工程及其它吸声领域具有重要参考价值。
For the commonly used isotropic sound-absorbing materials, an acoustic pressure reflection coefficient equation for an infinitely large sound-absorbing panel is established. The average reflection coefficient is the minimum objective, and the average acoustic reflection coefficient of the sound-absorbing panel is optimized for solving. The research shows that: Under acoustic impedance matching, the average reflection coefficient in the 0-π/2 incidence range is not the minimum, but the surface acoustic impedance is ρc, corresponding to the total absorption incident angle of 62.5°, the average acoustic reflection coefficient at the full angle is the lowest; if the surface The optimal value of the impedance is 1.35 ρc, corresponding to a total absorption incident angle of 42°. The average acoustic reflection coefficient at 0-π/3 can be as small as 0.07. This research has important reference value for the building sound absorption engineering and other sound absorption fields.