硅钢A计权磁致伸缩速度声压水平计算方法

Calculation method of A-weighted magnetostriction velocityand sound pressure level of silicon steel

IEC/TR 62581技术报告中引入了A计权速度声压水平用于表征磁致伸缩,但是未对其计算方法进行描述。针对A计权磁致伸缩速度声压水平计算公式中各项参数,详细解析了空气密度、空气中声速、磁致伸缩谐波频率、加权系数、磁致伸缩量等参数的取值方法、取值单位、适用条件。解析结果表明,解析方法可以降低A计权磁致伸缩速度声压水平计算方法的计算难度,提高其应用广度,提供了另一种表征磁致伸缩的计算方法。

In IEC/TR 62581 technical report,A-weighted velocity sound pressure level is introduced to characterize magnetostriction,but its calculation method is not described.In view of the parameters in the formula for calculating the sound pressure level of weighted magnetostriction,this paper analyzes the methods,units and applicable conditions in detail for the parameters such as air density,sound velocity in the air,magnetostriction harmonic frequency,weighting coefficient and magnetostriction quantity.The analytical results show that the analytical method can reduce the difficulty of calculating the acoustic pressure level of A-weighted magnetostriction velocity,and improve its application range.It provides another calculation method to characterize magnetostriction.