声压测量时平均声压级及其不确定度研究  

Research of Average Sound Pressure Level and Its Uncertainty in Sound Pressure Measurement

作　　者：林科[1] 袁卫平[1,2] 胡爱华[2] 姜晓敏[2] 刘光军[1] 

机构地区：[1]上海内燃机研究所,上海200438 [2]上海汽车集团股份有限公司商用车技术中心,上海200438

出　　处：《内燃机工程》2013年第S1期84-87,共4页Chinese Internal Combustion Engine Engineering

摘　　要：利用数学方法对声压测量时能量平均声压级和算术平均声压级进行了研究,并以435次不同对象9点测量结果为样本,统计得到单次测量时不同平均声压级的差值随声压级极差的变化曲线;重点用统计分析的方法对不确定度进行了研究。研究结果表明:96.8%的样本在100%的置信水平下,能量平均声压级标准不确定度和算术平均声压级标准不确定度相等。Mathematic method was used to study the relationship between energy average sound pressure level(EASPL)and arithmetical average sound pressure level(AASPL).Based on the samples obtained from 435time measurements at 9points for variable objectives the changing curve of difference between EASPL and AASPL with SPL's range was achieved.The uncertainty study using statistical method reveals that EASPL uncertainty and AASPL uncertainty are equal at 100% confidence level for 96.8% samples.

关 键 词：内燃机 声功率级测量 能量平均声压级 算术平均声压级 不确定度 

分 类 号：TK40[动力工程及工程热物理—动力机械及工程]