用声场抗性指数和不确定度限制规则确定声强测量的精度

The accuracy of the sound intensity measurements determined by sound field indicators and criteria for uncertainty limitation

本文对声强测量中声场抗性指数、有关判据以及不确定度限制规则作了详细的阐述。并且,选择了两组五种不同的初始测量条件,采用声强法对Jo41—4型三相异步电动机作了声功率级测定。结果表明:采用声强法进行测量时,只要按照不确定度限制规则及其判据进行,就能得到达到预期精度的测量结果。

The paper minutely expounds the sound field indicators, the relevant criterious and the criteria for uncertainty limitation. And making choice of two set of five differant kinds of initial measurement conitions, the sound power level of a three-phase asynchronous electric motor type J041-4 was measured with the sound intensity method. The result is that we can gain the measurement result achiving desired grade of accuracy using the sound intensity method so long as according to criteria for uncertainty limitation.