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当前位置: 首页 > 文章 > 球声源作振动时两种声强计算方法的比较 农业机械学报 2004,35 (3) 124-127
Position: Home > Articles > Comparison of Two Methods for Calculating Sound Intensity from Vibration of Ball Sound Source Transactions of the Chinese Society for Agricultural Machinery 2004,35 (3) 124-127

球声源作振动时两种声强计算方法的比较

作  者：
李阳星;周广林;陈心昭
单  位：
黑龙江科技学院机械工程系;合肥工业大学机械与汽车工程学院
关键词：
声强;几何平均声压;算术平均声压;误差
摘  要：
采用间接测量技术计算声强时 ,是用两传声器各自测得的声压进行算术平均 ,用其平均值代替被测点声压 ,分析发现 :在高频区误差较大。应用两测点声压的几何平均值代替被测点的声压 ,并以作振动的球声源为例 ,对基于这两种计算声压的方法得到的声强误差进行比较 ,结果表明 :对作振动的球声源 ,几何平均声强计算误差曲线比算术平均声强计算误差曲线随波数或频率的变化具有更平缓的特性 ,随着Δr/ r的增大 ,曲线上误差为零的点向着波数或频率增大的方向移动 ,且这种移动算术平均声强比几何平均声强更敏感 ,所以由几何平均声压得到的声强更适合于更宽频率范围的测量。
译  名：
Comparison of Two Methods for Calculating Sound Intensity from Vibration of Ball Sound Source
作  者：
Li Yangxing Zhou Guanglin(Heilongjiang Institute of Science and Technology) Chen Xinzhao(Hefei University of Technology)
关键词：
Sound intensity,Geometrically averaged sound pressure,Mathematically averaged sound pressure,Error
摘  要：
When calculating the intensity of sound by indirect measuring way,the sound pressures obtained from two microphones should be mathematically averaged as the sound pressure of measured point. The research showed that the error was bigger in the high frequency area. Using the mathematically averaged value of two measured points to replace the sound pressure of measured point,as a vibration example of the ball sound source,the errors from the two methods of calculating intensity of sound were compared. The result showed that the error of geometrically averaged sound intensity was more flat than that of mathematically averaged. The point with zero error will move toward the direction of the wave number or frequency increasing,and this movement makes the mathematically averaged value is more sensitive than the geometrically averaged one. The sound intensity obtained from geometrically averaged sound pressure is more suitable for the measurement of a wider frequency range.

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