平均声压级的简化算法及其误差修正

首先利用傅里叶级数的理论分析了机器噪声测试中平均声压级近似计算的误差,推导出了最大误差计算公式,其次基于误差公式指出国际标准中仅凭借测点声压级的波动范围来决定该近似方法的适用性是不合理的,还要考虑声压级的算数平均/10-最小声压级/10的值,最后对超过允许误差而不能使用该近似方法的情况加以修正,拓展了该方法的应用范围,有利于该方法的推广应用.

Simplified Algorithm and Error Correction of Average Sound Pressure Level

The approximate calculation error of average sound pressure level is discussed by the theory of Fourier series and the maximum error calculation formula is established. Then according to the formula, the unreasonableness of international standard is proposed that whether the approximate calculation method can be applied is determined only by the fluctuation range of sound pressure level, the value （ the arithme- tic average SPL of each measuring point divided by ten minus the minimum SPL divided by ten ） also should be considered. Finally, when the maximum error exceeds the allowable error, the approximate cal- culation method is amended to expand its scope of application, Thus it is in favor of the promotion and ap- plication.