基于Chirp-Z变换的结构热模态试验方法  

Test Method for Structural Thermal Modal based on Chirp-Z Transformation

作　　者：宋巧治 李晓东[1] 杨文岐[1] Song Qiaozhi;Li Xiaodong;Yang Wenqi(Aircraft Strength Research Institute of China,Xi′an 710065,Shaanxi,China)

机构地区：[1]中国飞机强度研究所,陕西西安710065

出　　处：《工程与试验》2021年第2期18-20,47,共4页Engineering and Test

摘　　要：本文提出了一种基于调频Z变换(Chirp-Z变换)的时变系统模态参数识别算法,通过对响应数据进行Chirp-Z变换获得细化频率后的结构频响特性,进而通过模态参数识别算法获得模态参数,并利用三自由度系统对该方法进行了验证,最后对受热机翼结构进行了动态特性参数识别,为高超声速热模态测试提供了一种方法。In this paper,a modal parameter identification algorithm of time-varying system based on chirp-Z transformation is proposed.The frequency response characteristics of the structure with refined frequency are obtained by chirp-Z transformation,and then the modal parameters are obtained by modal parameter identification algorithm.The method is verified by three degree of freedom system.Finally,the dynamic characteristic parameters of the heated wing structure are identified,which provides a method for hypersonic thermal modal test.

关 键 词：CHIRP-Z变换 参数识别 受热结构 

分 类 号：V416.4[航空宇航科学与技术—航空宇航推进理论与工程]