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1、交通噪声的测定Stillwatersrundeep.流静水深流静水深,人静心深人静心深Wherethereislife,thereishope。有生命必有希望。有生命必有希望Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment一 实验目的 三 实验步骤 四 数据处理二 实验仪器 Sino-Dutch Demonstration Researcher
2、and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment一 实验目的: 1) 掌握声级计的使用方法,学会用普通声级计测 量噪声 2) 熟练计算 等效声级 统计声级 标准偏差Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Cent
3、re for Water Treatment二、 实验仪器 1) 声级计的使用测量条件: 1) 天气条件 无雨 无雪 风速5.5米以下 2) 声级计的操作a 距地面垂直距离大于1.2米 b 传声器离人0.5米以上Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment3）使用方法（原理）（1）校准（2）根据被测声音的大小选择档位，无法估计的选85130档
4、位或自动挡（3）时间记权开关置于F或S（变化大的）（4）读数置于“10s”（5）电源开关置于“开”，读数测量（6）关Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment1) 监测布点四、实验步骤: 距离马路边缘20cm处离开路口距离大于50米Sino-Dutch Demonstration Researcher and Sino-Dutch Demo
5、nstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment2） 现场测量记录数据B手持声级计A记录单行车辆种类和数量CSino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment3）读数方法）读数方法 声级计置于慢格，每隔10s
6、读一个瞬时A声级，对每一个测量点，连续读取200个数据。Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment四、数值处理四、数值处理四、数值处理四、数值处理 由于环境噪声是随时间而起伏的无规则噪声，由于环境噪声是随时间而起伏的无规则噪声，因此测量结果一般用统计值或等效声级来表示。因此测量结果一般用统计值或等效声级来表示。1 1累积分布值累积分布值L1
7、0L10、L50L50、L90L90与标准偏差与标准偏差 L10 L10表示表示10%10%的时间超过的噪声级，相当于噪声的的时间超过的噪声级，相当于噪声的平均峰值；平均峰值； L50L50表示表示50%50%的时间超过的噪声级，相当于噪声的的时间超过的噪声级，相当于噪声的平均值；平均值； L90L90表示表示90%90%的时间超过的噪声级，相当于噪声的的时间超过的噪声级，相当于噪声的本底值。本底值。Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre fo
8、r Water TreatmentTraining Centre for Water Treatment 计算方法：将计算方法：将100个数据按从大到小的顺序个数据按从大到小的顺序排列，第排列，第10个数据即为个数据即为L10，第，第50个数据即个数据即为为L50，第，第90个数据即为个数据即为L90，标准偏差，标准偏差Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Wate
9、r Treatment数据符合正态分布，其累积分布在正态概率坐标上为一直线，即可用近似公式： 并有：Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment3） 结果表达结果表达Sino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water TreatmentSino-Dutch Demonstration Researcher and Sino-Dutch Demonstration Researcher and Training Centre for Water TreatmentTraining Centre for Water Treatment
