摘要
间接测量技术计算声强,是将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:基于算术平均声压得到的声强在高频区误差较大。应用两测点声压的几何平均值代替被测点的声压,并以四极子声源为例,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:对于四极子声源,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具有随频率的变化更平缓的特性,但前者曲线变化比后者曲线变化复杂,随着△r/r的增大,曲线上误差为零的点向着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。
Calculating the intensity of sound with the indirect measuring technology, involves performing arithmetic average value of the sound pressure obtained by two microphones and replacing the sound pressure of the measured point with average value. The research shows that sound intensity's error is bigger in high frequency area. Replacing the sound pressure of the measured point with the arithmetic average value of two measured points and comparing the errors derived from the two methods of calculating intensity of sound, with quadrupole sound source for example show that the error calculating curves of geometric average sound intensity are more flat than the ones of arithmetic average sound intensity with the changes of frequency. But the former curvilinear changes in a more complicated way than the latter. With the increase of Δ r/r, the point without error on the curves moves in the direction of the higher frequency, and this movement that means the arithmetic average value shows a greater sensitivity than the geometric average sound intensity. The sound intensity obtained by geometric average sound pressure permits the measurement with a wider frequency range.
出处
《黑龙江科技学院学报》
CAS
2003年第3期14-17,共4页
Journal of Heilongjiang Institute of Science and Technology
基金
国家自然科学基金资助课题(50275044)
黑龙江省骨干教师资助课题(1502G036)
关键词
声学
几何平均声压
误差分析
算术平均声压
声强
acoustics
geometric average sound pressure
error analysis
arithmetic average sound pressure
intensity of sound
