|
|
|
| New Method on Estimation of Sound Pressure Level Based the Inverse Law in Anechoic Room Calibration |
| PU Zhi-qiang, SUN Lei, E Zhi-qun |
| National Institute of Measurement and Testing Technology,institute of acoustics,Chengdu,Sichuan 610021,China |
|
|
|
|
Abstract The performance of an anechoic room is assessed by comparing the spatial decrease of sound pressure emitted from a test source with the decrease of sound pressure with distance from the source according the inverse square law that would occur in true anechoic. Adopting by reference of ISO 3745, JJF 1147-2006 calibration specification for acoustic performance of anechoic rooms and hemi-anechoic rooms, it was found that some defects on its proposed estimation method on determining sound pressure level based the inverse law and causes some unreasonable measurement results. The reasons and proposed a new estimation method by mathematic deduction are analyzed.
|
|
|
|
|
|
［1］ 张美娥,等.JJF 1147-2006 消声室和半消声室声学特性校准规范［M］.北京:中国计量出版社,2006: 6-7.
［2］ ISO 3745-2012 Acoustics-Determination of sound power level of noise source using sound pressure-Precision method for anechoic and hemi anechoic rooms ［S］.2012.
［3］ 蒲志强,等. 消声室声学性能评价方法探讨［J］.中国测试,2012,38(5):25-28.
［4］ 南京大学物理系声学实验室.南京大学消声室［J］.物理学报,1975,24(4):252-259.
［5］ 刘克,等.平板式半消声室测试及仿真计算［J］.声学技术,2007,26(5):111-112.
［6］ 孙广荣.消声室内最大自由声场误差的估算［J］.声学技术,1987,6(2):16-18.
［7］ 孙广荣.消声室自由声场鉴定的几个问题［J］.电声技术,2008,32(8): 4-5. |
|
|
|
2013, Vol. 34 
