机动车用喇叭声压级测量不确定度分析

Uncertainty in Measurement on Sound Pressure Level of Horn for Motor Vehicle

以DL50型机动车用喇叭为试验对象,采用JJG1059—1999《测量不确定评定和表示》规定的评定方法,对按照GB15742—2001《机动车用喇叭的性能要求及试验方法》规定进行机动车用喇叭声压级测量时引起的不确定度的各种因素进行了分析和评定。分析结果表明,机动车用喇叭声压级测量不确定度主要来源于试验环境,与被测物体发出声响的频率有关。

With the evaluation method specified in ＂The evaluation and expression of uncertainty in measurement＂ JJG 1059--1999,the factors causing uncertainty in measurement of sound pressure level of horn for motor vehicle according to the stipulation of GB 15742--2001 ＂The performance requirement and test method of horn for motor vehicle＂ were analyzed and estimated with the horns for motor vehicle DL50 as test sample.The analysis results showed that the uncertainty mainly came from test environment and is related with the sound frequency of measured subject.