摘要
在简要介绍硬涂层材料应变依赖性的基础上,推导了用迭代有限元法求解硬涂层复合结构动力学特性的原理,进一步提出了求解硬涂层复合结构固有频率和振动响应的计算流程,即由振动响应值来修正硬涂层材料参数,进而迭代求解硬涂层复合结构的动力学参数.最后以一个涂敷MgO+Al2O3硬涂层的悬臂梁为例进行了实例研究,在考虑MgO+Al2O3硬涂层材料应变依赖性的基础上,获得了不同激励幅度下悬臂梁的固有频率和振动响应,并与线性计算结果进行了比对.结果表明;该硬涂层复合结构悬臂梁具有软式非线性,同时,对应于不同的激励幅度,迭代计算获得的共振响应相对于线性计算值减少了29%~48%,说明硬涂层材料的应变依赖性会进一步增强硬涂层的减振效果.
On the basis of introducing the strain-dependent characteristic of hard-coating material,the dynamic characteristic solution theory of iterative finite element method was derived.Moreover,the processes of calculating natural frequency and vibration response were presented,which can be summarized as:the hard coating material parameters were corrected by the vibration response,and then the dynamic parameters were solved by the iterative solution program.At last,a cantilever beam coated with MgO+Al2O3hard coating was chosen to display the effectiveness of the proposed method.Considering the strain-dependent characteristic of MgO+Al2O3 hard coating,the natural frequency and vibration response were obtained under different exciting levels and also compared with the relative values obtained by linear calculation.Results show that the hard-coating composite structure cantilever beam displays the soft nonlinear phenomenon,and the resonance responses reduce by29%-48% compared with linear calculation correspondingly to different exciting levels.This shows that the strain-dependent characteristic of hard-coating material can promote the effect of vibration reduction.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2015年第9期2212-2218,共7页
Journal of Aerospace Power
基金
国家自然科学基金(51375079)
中央高校基本科研业务费专项资金(N140301001)
关键词
应变依赖性
硬涂层
复合结构
有限元分析
迭代计算
strain-dependent characteristic
hard-coating
composite structure
finite element analysis
iterative calculation