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lichao1990银虫 (小有名气)
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[求助]
理论声学作业题，求懂的朋友帮忙 已有1人参与
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大小为6m*10m*3m的混凝土壁面演讲厅内，地板上80%的面积都有座椅。500Hz，1/3倍频带的混响时间为1.3s，墙壁和地板未覆盖座椅时该频带下的扩散场吸声系数为0.05。计算500Hz频带时有座位区域的吸声系数。 A small lecture room measuring 6m*10m*3m has plastered concrete walls. The seating covers 80% of the floor area. The empty reverberation time in the 500Hz 1/3 octave band is 1.3 s. The estimated diffuse field absorption coefficient of the walls and uncovered floor in this band is 0.05. Estimate the absorption coefficient of the seating area in the 500Hz band. |
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fuyreg
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