双内凹负泊松比超结构粘弹性阻尼隔振器研究OA

To isolate low frequency micro-amplitude vibration,a novel viscoelastic damping vibration isolator was designed,which mainly consists of a negative Poisson's ratio double-concave sheets structure and its internal filling of butyl rubber damping material.In this paper,the finite element method was used to analyze the negative Poisson's ratio(NPR)effect and stiffness of the double-concave sheets,and the hyperelastic and viscoelastic properties of the butyl rubber were characterized through experiments;a finite element model of the vibration isolatorwas established to analyze its static properties,free vibration and forced vibration,and other dynamic properties.The results showed that the resonance peak is reduced by 92.8%compared with the spring-damped vibration isolator,and the equivalent damping is 1 600 Ns/m.The effects of the concave angle θ and the thickness t of the sheet on the vibration transmission rate of the vibration isolator were analyzed.Experimental test platform of vibration isolation was established.The experimental results coincide with those predicted by theoretical model and finite element model,and then the effectiveness of the vibration isolator was verified.