摘要
JJF 1147消声室校准规程中反平方率声压级的推导公式存在一定缺陷,易导致推算出的自由声场偏差值出现"近大远小"的不合理现象,本文通过分析空气吸收因素对校准精度的影响,提出一种估算消声室室内理论声压级的新方法,在拟合模型中加入了空气吸收的衰减部分,采用非线性最小二乘法估计理论声压级,能够提高校准精度,为实际消声室校准工作提供理论依据.
The formula to derivate sound pressure level based on the inverse law has some problems for the anechoic chamber calibration in JJF 1147 specifications,which causes the sound pressure level deviation to increase with the measurement distance from sound source closing. The influence of the air absorption factors have been analyzed on anechoic chamber calibration accuracy. A novel method is proposed to estimate the sound pressure level applied in the anechoic chamber calibration,which considers the air absorption attenuation and uses the nonlinear least square method to calibrate the theoretical sound pressure level. The present method can improve the calibration accuracy effectively and also provide the theoretical basis for the practical anechoic chamber calibration.
出处
《南京师范大学学报（工程技术版）》
CAS
2016年第2期10-15,共6页
Journal of Nanjing Normal University(Engineering and Technology Edition)
基金
国家自然科学基金(51475246)
江苏省高校自然科学基金(15KJB470011)
江苏省普通高校专业学位研究生科研实践计划项目(SJLX15_0306)
关键词
消声室
校准方法
自由声场
空气吸收
声压级
anechoic chamber
calibration method
free sound field
air absorption
sound pressure level
