摘要
硬涂层减振是一项新兴的阻尼减振技术,硬涂层复合结构在随机激励载荷作用下的振动特性建模与分析方法还未开展研究。将有限元建模方法和虚拟激励法(pseudo excitation method,PEM)相结合,实现了随机激励作用下硬涂层悬臂薄板结构振动建模及减振性能预估。首先,基于等效单层法创建了双面涂敷硬涂层的薄板结构振动特性有限元模型,得到了基础激励作用下包含涂层材料阻尼和剩余等效黏性阻尼的复合板结构的运动方程。接着,利用虚拟激励法,将平稳随机激励载荷谱转化为简谐激励,得到了硬涂层薄板结构在随机激励作用下的响应功率谱密度的求解方法。最后,以双面涂敷NiCrAl硬涂层材料的45#钢悬臂板为实例进行研究,利用所研发的方法计算了涂层板结构的固有频率及随机基础激励作用下的振动响应,并与试验数据进行对比校验。进一步,分析了涂层厚度、储能模量和损耗因子对悬臂板振动特性的影响。结果表明,适当增加上述涂层参数量值可有效提高硬涂层的减振效果。
Hard-coating damping is a new damping and vibration reduction technology.Modeling and analysis methods of hard coating composite structures under random excitation load have not yet been studied.In this paper,the finite element modeling method and the pseudo excitation method(PEM)were combined to realize vibration modeling and prediction of vibration reduction performance for a hard-coating cantilever thin plate structure under random excitation.First,based on the equivalent single-layer method,a finite element model of the vibration characteristics of the thin plate structure with hard coating on two sides was created,and the equation of motion of the composite plate structure including the coating material damping and the remaining equivalent viscous damping under the basic excitation was obtained.Then,by using the PEM to convert the steady random excitation load spectrum into simple harmonic excitation,the solution method of the response power spectrum density of the hard-coating thin plate structure under random excitation was obtained.Finally,a case study was carried out for a 45#steel cantilever plate coated with NiCrAl hard-coating material on both sides as an example.The natural frequency of the hard-coating plate structure and the vibration response under random base excitation were calculated using the developed method,and experimental data were used to compare and verify.Furthermore,the influence of the thickness,storage modulus and loss factor of hard coating on the vibration characteristics of the cantilever plate was analyzed.The results show that appropriate increase in the values of coating parameters mentioned above can effectively improve the vibration damping effect of hard coating.
作者
孙悦
刘晓峰
孙伟
SUN Yue;LIU Xiaofeng;SUN Wei(School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110819,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第4期63-69,共7页
Journal of Vibration and Shock
基金
中央高校基本科研业务费专项资金资助项目(N180312012,N170308028)。
关键词
随机激励
硬涂层薄板
振动特性
虚拟激励法(PEM)
涂层参数
random excitation
hard-coating thin plate
vibration characteristics
pseudo excitation method(PEM)
coating parameters
