波导结构不连续点高阶动力学建模及模型参数识别  

High-order dynamic modeling and parameter identification of structural discontinuities in waveguides

作　　者：范强[1] 张冰[2] 黄震宇[1] 陈大跃[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]济南大学机械工程学院,山东济南250022

出　　处：《振动工程学报》2012年第4期351-358,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(50905107);国家"863"计划资助项目(2009AA043000-2009AA043001)

摘　　要：用高阶动力学模型表征波导结构不连续点的动力学特性,并基于波导不连续点处的反射系数与不连续点的动力学模型参数间的解析关系,利用反射系数曲线的特征点值迭代识别出不连续点的动力学模型参数,从而实现复杂不连续点的准确建模。应用不连续点高阶动力学建模方法建立梁不连续点的动力学模型,针对典型的不连续点一阶、二阶动力学模型,分别用有限元法和实验法识别模型参数,结果表明:质量的识别误差在8%以内,刚度、转动惯量的识别误差在4%以内;并分析了产生识别误差的可能原因。A method of discontinuity modeling with high-ordered parameters is developed based on the wave-propagation characteristics.The characteristic values are firstly derived from the discontinuity reflection curve and then these values are used to identify the parameters of discontinuity by the analytical relations among the parameters and the reflection coefficients.Numerical examples,which comprise of a finite uniform beam,with the one-order and two-order discontinuities being simulated by a set of steel blocks and springs,are set up.The theoretical results are then compared with those from experiments.It shows that the errors of the identified mass,translational stiffness and moment of inertia are below 8%,4% and 4%,respectively.The possible reasons,which lead to these identification errors,are discussed.

关 键 词：参数识别 动力学建模 反射系数 波导 不连续点 

分 类 号：O327[理学—一般力学与力学基础] TB123[理学—力学]