利用改进的EKF滤波技术识别成层土集总参数模型的参数  

Identification of parameters in lumped-parameter model of layered-soil by using improved EKF method

作　　者：王满生 胡聿贤[2] 周锡元[3] He Liu 

机构地区：[1]School of Engineering,University of Alaska,Anchorage,AK 99508,USA [2]中国地震局地球物理研究所,北京100081 [3]北京工业大学抗震减灾研究所,北京100022

出　　处：《振动工程学报》2006年第2期252-257,共6页Journal of Vibration Engineering

摘　　要：根据非线性系统状态参数估计理论和土-结构系统的实际地震动记录,利用多项式一阶近似来代替EKF滤波技术中的求导线性化过程,来估计土双自由度集总参数模型中各参数值。这是一种比较新的参数在线实时辨识技术,具有运算简单、计算精度较高的优点。以美国A laska州A nchorage市中心一栋14层办公大楼为算例,结果显示地基土集总参数模型的参数递推结果相当可靠。整个方法易于在M ATLAB操作平台上实现。While SSI is considered, the soil is often simplified by tow-degree-of-freedom lumped-parameters model which is only suitable for isotropic elastic soil. However the soil in civil engineering is always layered and anisotropic soil. In order to simply the layered soil in SSI problem, the article provides a new way that is still 2DOFM lumped-parameters model, but the parameter values are identified the first-order polynomial approximation method on the basis of the actual acceleration records. The method given in the article have some virtues, such as less computation and high computed precision, and the results for the model parameters are very reliable. The method is operated in MATLAB.

关 键 词：土-结构相互作用 双自由度集总参数模型 状态方程 成层土 多项式一阶近似 

分 类 号：TU435[建筑科学—岩土工程]