摘要
从频域细化角度,提出了细化共振法来准确辨识纤维增强复合薄板的非线性阻尼参数。首先,基于频率细化法和共振法理论,重新推导具有振幅依赖的复合薄板结构非线性阻尼的表达式,明确从频域测试角度获取非线性阻尼参数的理论原理。然后,通过仿真信号算例,验证了该方法的正确性,并讨论了频率分辨率和细化倍数对阻尼辨识精度的影响。最后,总结并概括出一套合理、规范的阻尼辨识流程,并对TC500碳纤维/树脂基复合薄板进行实际测试。研究发现,利用该方法可定量评价具有振幅依赖特点的复合薄板的非线性阻尼,且随着激励幅度的增大,其阻尼特性呈现逐步增大的趋势。
From the frequency refinement perspective,the refined resonance method is proposed to accurately identify the nonlinear damping parameters of fiber-reinforced composite thin plates.Firstly,based on frequency refining technique and resonance method theory,the expression of nonlinear damping of the composite plate with amplitude dependence is derived,and the theoretical principles of acquiring such nonlinear damping from the frequency-domain measurement are clarified.Then,the correctness of such method is verified by taking a simulation signal as an example,and the influences of frequency resolution and refining multiple on damping identification accuracy are discussed.Finally,a reasonable and standard test procedure is summarized and applied on the real measurement of TC500 carbon fiber/resin composite thin plate.It has been found that the proposed method can be used to quantitatively evaluate nonlinear damping of composite thin plate structure with amplitude dependent characteristics.And as the excitation amplitude increases,its damping property shows a gradually rising tendency.
作者
李晖
常永乐
韩清凯
闻邦椿
LI Hui;CHANG Yongle;HAN Qingkai;WEN Bangchun(School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110819;Key Laboratory of Vibration and Control of Aero-Propulsion Systems,Ministry of Education,Northeastern University,Shenyang 110819)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2020年第12期9-18,共10页
Journal of Mechanical Engineering
基金
国家自然科学基金(51505070,51535082,U1708257)
中央高校基本科研业务费专项资金(N160313002,N160312001,N170302001,N180302004,N180703018,N180312012,N180313006)
装备预研重点实验室基金(6142905192512)资助项目。
关键词
纤维增强复合薄板
非线性阻尼
频域测试
振幅依赖性
细化共振法
fiber-reinforced composite thin plate
nonlinear damping
frequency-domain test
amplitude dependence
refined resonance method
