摘要
论述了对公路桥梁汽车轮轴特征进行研究的必要性和汽车类型划分及轮轴特征参数的选取原则。针对实际公路上复杂多变的汽车轮轴重和轮轴距，介绍了对其概率分布进行统计推断的非线性最小二乘拟合的原理与数值实现方法，以及采用多峰正态分布对其进行拟合的可行性。由动态称重系统（WIM）从现场实测大量汽车的轮轴距和轮轴重量信息，对实际公路上的汽车轮轴特征进行统计分析，将汽车按轴数划分为2—6轴车辆，其中2轴车辆按照轴距进一步划分为2轴小车和2轴货车。以汽车总重、车长、各轴重与总重比值、各轴距与车长比值作为轮轴特征参数，根据各轮轴特征参数的概率分布类型，分别采用单峰、双峰或三峰正态分布进行拟合，给出各类型汽车轮轴特征的概率分布类型及和分布参数。
The necessity of analysing the characters of wheel axles of vehicles on highway bridge, the principles of categorizing vehicles and selecting parameters of characters of wheel axles are demonstrated. To the polytypic wheelbase and wheel load of vehicles on actual highway bridges, the theory and numerical iterative method for nonlinear least square fitting to statistically infer the probability distribution and the statistical parameters of them are introduced, and the workability of a multi-peak normal distribution model to fit the statistical inferences is demonstrated. According to the wheelbase and wheel load of vehicles obtained by WIMs on site, the characters of wheel axles of vehicles is statistically analyzed. The vehicles are categorized by their axle numbers from 2 axles to 6 axles, among which the vehicles of 2 axles are further separated into cars and trucks by the distance of their wheelbases. The parameters of vehicles, such as gross weight, total length, the ratio of each wheel load to gross weight, and the ratio of each wheelbase to total length, are set to describe the characters of wheel axles of each vehicle. With the actual probability distributions of the characters of wheel axles acquired on the spot, the types of probability distributions and parameters of them are statistically inferred. By means of the method of fitting with normal distribution model from one peak to three peaks.
出处
《公路交通科技》
CAS
CSCD
北大核心
2013年第11期41-52,共12页
Journal of Highway and Transportation Research and Development
基金
广东省科技厅科技计划项目(2007B030802002)
广东省交通运输厅科技项目(2007-23)
关键词
桥梁工程
汽车轮轴特征
非线性最小二乘拟合
轮轴距
轮轴重
概率分布
bridge engineering
character of wheel axle of vehicle
nonlinear least square fitting
wheelbase
weight of wheel axle
probability distribution
