基于改进MCPP的时变系统模态参数识别  

MODAL PARAMETER IDENTIFICATION OF TIME-VARYING SYSTEM BASED ON IMPROVED MCPP

作　　者：张志超[1] 史治宇[1] 张杰[1] 

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《低温建筑技术》2016年第12期50-53,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金(11172131;11232007);2015年度省产学研前瞻联合研究项目(BY2015003-01);机械结构力学及控制国家重点实验室(南京航空航天大学)自主研究课题资助(0515G01);中央高校基本科研业务费专项资金资助;江苏高校优势学科建设工程资助项目

摘　　要：基于多尺度线性调频原子路径追踪及多项式相位信号幅值估计理论的基础上,针对时变系统提出一种模态参数识别的方法。首先,该方法对响应信号划分动态时间支撑区;在每一个支撑区上追踪投影最大的线性调频原子;按照最优连接路径对原子进行连接;采用二次拟合方法对分量信号幅值进行拟合逼近;最后得出分量信号幅值及瞬时频率识别系统的模态参数。刚度和阻尼复杂变化模态参数识别仿真算例表明,改进方法相对原方法提高了识别精度,具有更为广泛的工程应用前景。Based on multi-scale chirplet path pursuit （MCPP） and polynomial phase signal parameter estimation theory, a method is proposed for modal parameters identification of time-varying systems for the multi degree of freedom system that has time-varying parameters. Firstly, the vibration responses is divided into binary regions of dynamic time supporting; in every regions of dynamic time supporting the chirplet which has the largest projection coefficient is chosen; according to the optimal link algorithm the chirplet is connected; the component signal amplitude approximation is fitted by Quadratic fitting method; by using the amplitude and instantaneous frequency, the system modal frequency can be identified. Comparing the original method, numerical simulation examples show the proposed method has high accurately identification and a wide range of engineering application prospect.

关 键 词：多尺度线性调频原子 路径追踪 时变系统 模态参数识别 

分 类 号：TU317[建筑科学—结构工程]