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南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:

2016年02期

Page:

10-

Research Field:

电气与电子工程

Publishing date:

Info

Title:

A Novel Method on the Sound Pressure Level EstimationApplied in Anechoic Chamber Calibration

Author(s):

Wang Qin¹; Yan Wei¹; Wang Enrong¹; Li Lin²; Wu Yun²

（1.School of Electrical and Automation Engineering，Nanjing Normal University，Nanjing 210042，China）（2.Jiangsu Institute of Metrology，Nanjing 210023，China）

Keywords:

anechoic chamber; calibration method; free sound field; air absorption; sound pressure level

PACS:

TB95

DOI:

10.3969/j.issn.1672-1292.2016.02.002

Abstract:

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.

References:

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Memo

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Common functions

Last Update: 2016-06-30