JJF 1147-2006《消声室和半消声室声学特性校准规范》给出了计算声压级的反平方率法,针对其出现的近场处声压级偏差较大的问题,将空气吸收的衰减部分纳入考虑,提出了一种加入空气吸收衰减因素,选取测量位置为1m处的实际声压级来计算消声室声压级的新方法。通过实验对比,此方法可以很好地改善上述现象,提高了校准精度。
Abstract
The inverse square law for calculating the sound pressure level was proposed in JJF 1147-2006 “Calibration Specification for Acoustic Performance of Anechoic Rooms and Hemi-anechoic Rooms”, causing a large deviation of sound pressure level near the sound source. For this problem, a new method of adding the air absorption attenuation factor and selecting the actual sound pressure level at the measurement position of 1 m to calculate the sound pressure level of the anechoic chamber is proposed. Through comparative experiments, the above situation can be well improved and the calibration accuracy can get increased.
关键词
计量学 /
消声室 /
自由场 /
空气吸收 /
声压级
Key words
metrology /
anechoic chamber /
free sound field /
air absorption /
sound pressure level
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参考文献
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