基于Novozhilov-柔度理论的连续弯箱梁桥位移参数Kalman滤波识别

为了有效评估和预测弯箱梁桥位移场、应力场,进行了连续弯箱梁桥位移参数的识别,推导了连续弯箱梁桥位移参数的Kalman滤波方程,同时基于Novozhilov-柔度理论,给出了弯箱梁桥位移参数Kalman滤波识别的具体步骤。研究结果表明:连续弯箱梁桥位移参数的Kalman滤波识别对位移参数滤波初始值的选取有较强的依赖性,位移参数滤波初始值选取恰当时,位移参数的Kalman滤波识别过程稳定收敛,且收敛于参数真值;滤波初始值选取不合理时,滤波过程易发散。

Kalman Filtering Identification for Displacement Parameters of Continuous Curved Box Girder Bridge Based on Novozhilov-flexibility Theory

Correct identification of displacement parameters of continuous curved box girder bridge which helps to evaluate the displacement field and stress field effectively and structure prediction was analyzed.Kalman filtering equations of displacement parameters of continuous curved box girder bridge were deduced.Combined with Novozhilov-flexibility theory of continuous curved box girder bridge,the steps of Kalman filtering identification of displacement parameters of continuous curved box girder bridge were given.It is demonstrated that Kalman filtering identification of displacement parameters of continuous curved box girder bridge has a strong dependence on the selection of filtering initial values of displacement parameters.When filtering initial values are proper, the filtering process is steady and convergent to parameters' true values;when the values are improper,it is apt to be divergent.