基于声压法的半混响声场反射声修正值计算及试验验证

Calculation and experimental verification of reflection sound corrected value in semi-reverberation sound field base on sound pressure method

推导出半混响声场反射声修正值公式,对反射声修正值公式进行试验验证。首先,利用声压级计算公式推导出反射声修正值公式;然后利用该公式计算出测点位置的反射声修正值;最后在半消声室与风洞实验室布置相同测点,测定反射声值,将它们做差处理,得到反射声的试验修正值。结果表明,反射声的计算修正值与反射声的试验修正值基本一致,说明反射声修正值公式适用于该风洞实验室,验证计算结果正确,为以后在风洞实验室进行声学试验提供了反射声修正值计算的理论依据。

In this paper, a reflection sound correction formula in semi-reverberation sound field was reasoned out, and then it was tested and verified. First,a reflection sound correction formula was obtained through SPL formula. Furthermore,the reflection sound correction of measuring point was calculated according to this correction formula. Finally, a reflection sound experiment correction was gotten from the difference between one measured value, which was acquired in semi-anechoic chamber, and another measured value, which was acquired in wind tunnel laboratory at the same place. The comparison results show： reflection sound calculated correction and reflection sound experiment correction are well matched, and the correction formula is able to be applied to wind tunnel laboratory. It provides a theory basis for acoustic experiment to calculate reflection sound correction in wind tunnel laboratory.