声级计测定电动自行车车速提示音的不确定度评定

The Uncertainty Evaluation in Measuring the Speed Warning Sound of Electric Bicycle by Sound Level Meter

引入车速提示音的测量不确定度不仅能够有效、准确的表征测试结果,同时也符合实验室质量控制的要求。本文评定实际工作中车速提示音的不确定度,分析了测试设备允许误差、校准设备的不确定度等因素对测量结果造成的影响,计算出使用一级精度声级计测量车速提示音的扩展不确定度为1.4 dB。

The introduction of the uncertainty in measuring the speed warning sound can not only effectively and accurately characterize the test results, but also conform to the requirements of laboratory quality control. This paper evaluates the uncertainty of the speed warning sound in the actual work, analyzes the influence of the test equipment tolerance, the uncertainty of the calibration equipment and other factors on the measurement results, and calculates the standard uncertainty of the speed warning sound using the AWA5661 sound level meter. The expanded uncertainty is 1.4 dB.