摘要
通过正弦扫频试验对橡胶隔振器轴向非线性动态特性进行研究,发现橡胶隔振系统响应具有明显的激振频率相关性。建立了基于FVMS高阶分数导数模型的修正本构模型,并给出隔振系统动刚度和阻尼系数的计算方法,基于非线性最小二乘法原理结合扫频试验结果,识别得到中低频段和共振频段的模型参数,与试验结果比较,所建立的模型能够精确地描述橡胶隔振系统中低频段和共振频段动态特性随激振频率及位移幅值的变化规律,并预测出隔振系统的加速度响应及共振频段的出现,且在其他工况下也具有较好的预测结果,说明建立的模型能够精确地描述橡胶隔振器的轴向动态特性并具有一定的适用性及推广性。
The axial nonlinear dynamic characteristics of the rubber isolator are investigated by means of sinusoidal frequency sweep tests,and it is found that the response of the rubber isolation system has a significant excitation frequency dependence.A modified principal structure model based on the higher-order fractional derivative model of the FVMS is established,and the dynamic stiffness and damping coefficients of the vibration isolation system are calculated.The model can accurately describe the dynamic characteristics of the rubber isolation system in the low frequency and resonant frequency bands with the frequency and displacement amplitude,and predict the acceleration response of the vibration isolation system and the occurrence of the resonant frequency band,and also has good prediction results in other operating conditions,It shows that the model developed can accurately describe the axial dynamic characteristics of the rubber isolator and has certain applicability and extension.
作者
杜奕函
胡绍全
杜强
DU Yi-han;HU Shao-quan;DU Qiang(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China)
出处
《强度与环境》
CSCD
2022年第3期36-44,共9页
Structure & Environment Engineering
基金
国家自然科学基金面上项目(11872059)。
关键词
橡胶隔振器
分数导数
非线性本构模型
动态特性
Rubber isolator
Fractional derivative
Nonlinear constitutive model
Dynamic characteristics
