摘要
牵引变压器是轨道交通车辆动力系统的重要组成之一,其噪声水平直接影响轨道车辆整个噪声水平。如何准确地测量牵引变压器的噪声值直接关系到车辆噪声的预测和评估的准确性。针对牵引变压器噪声的测量问题,文章利用扫描声强法对牵引变压器表面噪声源识别,并推导计算出距变压器轮廓表面1 m处的声压值。通过与实际测量声压值对比分析得出,牵引变压器的声压级相差4.5 d B(A),且在低频段,由于受环境因素的影响,其差别较大;高频段,其频谱具有相同的趋势。
Traction transformer is one of the important components of the power system on urban rail transit vehicles. Its noise level is directly influence of rail vehicles noise level. How to accurately measure the noise level of transformer is related to the accuracy of prediction and evaluation of vehicle noise. For the precisely measurement of traction transformer noise,this paper uses sound intensity scanning method for transformer surface source identification. The sound pressure level of the microphone sensor from the transformer surface 1 m is derivation. Through the comparative analysis with the actual measurement of sound pressure level,its has discrepancy with 4.5 d B（A） between the derivation value and measurement value. Due to the influence of environmental factors,the sound pressure level has differences in the low frequency. In the high frequency,the sound pressure has the same trend.
出处
《电力机车与城轨车辆》
2015年第5期61-64,77,共5页
Electric Locomotives & Mass Transit Vehicles
关键词
牵引变压器
噪声
扫描声强法
声功率
traction transformer
noise
sound intensity scanning
sound power level
