由桥梁动力响应识别过桥汽车参数的灵敏度方法

为了识别通过桥梁汽车的参数,提出了在灵敏度分析的基础上由简支梁桥动力响应识别过桥汽车参数的方法。将汽车抽象为两自由度五参数模型,用有限元方法计算桥梁的动力响应。从对未知参数的猜测值开始,由测试或模拟计算的动力响应用最小二乘法和规则化技巧识别过桥汽车参数,用邻近两次识别参数的百分相对误差(RPE)控制迭代过程的终止。由数值模拟结果可知,识别得到的汽车参数是令人满意的,其中质量的识别精度最高,表明该方法识别过桥汽车参数可行。

Sensitivity Method of Vehicle Parameters Identification through Dynamic Responses of Bridge

In order to estimate the parameters of the vehicle,this paper describes the parameters identification of vehicle moving on simply supported bridge based on sensitivity analysis using dynamic response.The moving vehicle is modeled as a two-degree-of-freedom system with five parameters.The finite element method is used to calculate the responses of the bridge.Starting with an initial guess for the unknown parameters value,the identification can be realized based on least square method and regularization technique from measured responses,which finds the best estimates of parameters by minimizing the RPE(Relative Percent Error) between two adjacent iterations.Study results indicate that the identified results are satisfactory,and the identified mass value is the best to match the real parameter,which verifies that the method is effective to identify parameters of vehicle moving on the bridge.