高刚度高阻尼结构试验研究

利用预置变形碳纤维梁、螺旋弹簧、碟簧和橡胶块构成一种高刚度高阻尼结构,其承载刚度和阻尼均较大。为了便于对高刚度高阻尼结构的力学性能进行评价,提出技术指标,即:等效弹性模量、等效阻尼系数和等效刚度系数。在此基础上,设计静动态力学试验,验证高刚度高阻尼结构设计方法的有效性并评价其力学性能。试验结果表明,高刚度高阻尼结构的等效弹性模量显著大于单个预置变形碳纤维梁;等效阻尼系数随着频率增大而减小,等效刚度系数随着频率增大而增大,分别大于104 Ns/m和107 N/m。由此证明,高刚度高阻尼结构的设计方法有效,且实现了输出刚度和阻尼均较大的设计目标。

Tests for a high stiffness and high damping structure

A single pre-deformed carbon fiber beam, helical springs, disc springs and viscoelastic rubber blocks were used to form a high stiffness and high damping structure.Its bearing stiffness and damping were larger.In order to conveniently evaluate the mechanical performance of this structure, 3 technical indexes including equivalent elastic modulus, equivalent damping coefficient and equivalent stiffness coefficient were proposed to design its static and dynamic tests, verify the effectiveness of its design method and evaluate its mechanical performance.The test results showed that the equivalent elastic modulus of this structure is much larger than that of a single pre-deformed carbon fiber beam; with increase in excitation frequency, its equivalent damping coefficient decreases, while its equivalent stiffness increases, they are larger than 104 Ns/m and 107 N/m, respectively; so the design method for this structure is effective to realize the design goal of larger output stiffness and output damping.