航空声学风洞背景噪声测试及频谱分析  

Measurement and Spectrum Analysis of Background Noise of Aeroacoustic Wind Tunnel

作　　者：顾光武[1] 朱博[1] 

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《噪声与振动控制》2011年第2期156-158,162,共4页Noise and Vibration Control

摘　　要：为了降低航空声学风洞背景噪声的声压级水平,有必要对风洞背景噪声进行测试和分析。针对0.55 m×0.4 m航空声学风洞,介绍风洞背景噪声的测试方案及频谱分析。利用计算机采集得到的试验数据,使用平均周期图法计算噪声自功率谱密度,对测试结果进行详细分析。测试结果表明:风洞开口试验段风速为80 m/s时,背景噪声声压级为78.15 dB。It is necessary to measure and analyze the background noise of aero-acoustic wind tunnel in order to reduce its sound pressure level（SPL）.In this paper,the measurement scheme and frequency spectrum analysis of a 0.55m×0.4m aero-acoustic wind tunnel are introduced.According to the acquired data,the power spectrum density is obtained by means of the average periodic diagrams,and the result is comprehensively analyzed.The result of measurement shows that the SPL of the background noise is 78.15dB when the wind speed in the open-jet test sections is 80m/s.

关 键 词：声学 噪声测量 航空声学风洞 频谱分析 平均周期图 背景噪声 

分 类 号：V211.74[航空宇航科学与技术—航空宇航推进理论与工程]