热振环境下薄壁结构动力学参数识别的流形学习方法  

Manifold learning method for identification of dynamic parameters of thin-walled structures under thermal vibration

作　　者：董龙雷[1] 郝彩凤 赵建平[1] DONG LongLei;HAO CaiFeng;ZHAO JianPing(State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学机械结构强度与振动国家重点实验室,西安710049

出　　处：《中国科学：物理学、力学、天文学》2019年第2期119-126,共8页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家安全重大基础研究项目(编号:613274)资助

摘　　要：热振激励下的高超声速飞行器复合材料薄壁结构的动力学特性复杂,通过对不同载荷条件下薄壁结构的动力学参数识别可进行结构动态特性评估.针对热振激励下的非线性结构,基于流形学习提出了一种识别结构动力学参数的新方法,该方法仅从响应数据就可以识别结构的固有频率、振型和阻尼比.通过建立热振联合试验系统,对C/SiC复合材料薄壁结构开展不同温度下的热振试验,得到不同温度下的动力学参数并获取试验响应数据集,基于流形学习方法的识别结果与试验结果对比,验证了方法的可行性,并得到了C/SiC复合材料薄壁结构的动力学参数随温度的演化规律.Dynamic characteristics of hypersonic aircraft composite thin-walled structures subjected to thermal vibration are complex,and the dynamic characteristics of thin-walled structures can be evaluated by identifying the dynamic parameters of thin-walled structures under different loads.Based on manifold learning,a new method for identifying structural dynamic parameters is proposed for nonlinear structures subjected to thermal vibration.The method can identify the natural frequency,mode shape and damping ratio of the structure only from the response data.A combined Thermal-Vibratory Test system was established,and the thermal vibration tests of thin-walled C/SiC composite structures were performed at different temperatures.From tests,the kinetic parameters at different temperatures were obtained and the test response data set was obtained.The feasibility of the method is verified by comparing the recognition results of manifold learning method with the experimental results,and the evolution law of dynamic parameters with temperature for thin-walled C/SiC composite structures is obtained.

关 键 词：参数识别 流形学习 热振试验 

分 类 号：V214.4[航空宇航科学与技术—航空宇航推进理论与工程] V414.4