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提出了通过优化墙截面形状来改变声学小房间低频响应的优化方法。在矩形有限元模型中将墙面用不同的阶梯形状作为墙截面进行代换,并用于具有不同墙面的房间,进行了声场分析。阶梯形状间的差异仅是阶梯高度的取值不同,分别为相等、随机和优化值。将获得优化值的优化方法用于60Hz到120Hz的频率范围内,对不同阶梯墙面以及平墙面房间的频率响应进行了数值计算和比较。结果显示墙截面采用优化值时得到的房间频响最为均匀;将房间长、宽、高比例改变后重复上述数值分析,仍得到房间频响改善在优化情况下最大的结果。对比例较差的房间改善幅度可达4.5dB。另外还以半圆和三角形作为墙截面形状计算了半圆半径和三角形高度分别为固定值和优化值时房间的频率响应,同样得到优化墙面优于固定值墙面的结果。因此通过运用优化的墙截面来改善房间低频声场特性是有意义的。
An optimization method to change the low frequency response of the acoustic booth by optimizing the shape of the wall section is proposed. In the rectangular finite element model, the wall is replaced by different staircase shapes as wall sections, and used in rooms with different wall surfaces for sound field analysis. The difference between the shapes of the steps is only the difference of the values of the steps, which are equal, random and optimized. The optimization method of obtaining optimized value is used in the frequency range of 60Hz to 120Hz, and the frequency response of different staircase walls and flat wall rooms are numerically calculated and compared. The results show that the optimal frequency of the wall cross-section is the most uniform frequency response. After the length, width and height of the room are changed, the above numerical analysis is repeated, and the maximum frequency response improvement is obtained under optimized conditions. Poor contrast room up to 4.5dB. In addition, the semicircular and triangular shape of the wall was used to calculate the frequency response of the room when the semicircular radius and the height of the triangle were fixed values and optimized values, respectively. The result of optimizing the wall better than the fixed wall was also obtained. Therefore, it is meaningful to improve the room low-frequency sound field characteristics by using optimized wall sections.