Variability of automotive interior noise from engine sources
Variability of automotive interior noise from engine sources
复制标题
来自发动机源的汽车内部噪声的变化
DOI：
10.3397/1.3549014
复制
发表时间：
2011
影响因子：
0.4
通讯作者：
B. Mace
中科院分区：
文献类型：
--
作者：
E. Hills;N. Ferguson;B. Mace
对某厂家生产的一组1106辆汽油和柴油车的一系列车内噪声测量数据进行了统计分析：小型掀背车和中型家用五门轿车。发动机以50 rpm的间隔运行，柴油和汽油发动机的转速范围分别从1000 rpm到4000 rpm和5950 rpm，而车辆在测功机滚子试验台上满负荷运行，包括平滑的滚动表面。随后，在第三个八度频带和总体水平上分析了与乘客耳朵位置对应的四个位置的室内噪声测量结果，并对线性均方根压力进行了统计测试。线性数据的归一化标准差随着频率的增加而减小。在整个音频范围内，它通常小于0.1，与车辆类型或发动机无关。对数正态分布最适合大多数发动机噪声结果，总体发动机噪声可以用对数正态分布或伽马分布来描述。对数正态分布拟合意味着以分贝为单位的值是正态分布的。
A statistical analysis of a series of interior vehicle noise measurements on a set of 1106 automotive vehicles, both petrol and diesel versions, from one manufacturer is presented: a small hatchback model and a mid-sized family 5-door car. The engines were run at 50 rpm intervals over therange from 1000 rpm up to 4000 and 5950 rpm for the diesel and petrol variants respectively, with full load in econd gear whilst the vehicle was on a dynamometer roller test rig, comprising a smooth rolling surface.The measured interior noise at four positions corresponding to passenger ear locations were subsequently analysed in third octave bands as well as the overall levels, with statistical tests being performed on the linear rms pressures. The normalised standard deviation of the linear data decreases with increasing frequency. It is typically less than 0.1 over the whole audio frequency range irrespective of vehicle type or engine. A lognormal distribution provides the best fit to the majority of the engine noise results and the overall engine noise could be described by a lognormal or gamma distribution. A lognormal distribution fit implies that the values in dB are normally distributed.