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结构的动力特性(自振频率、阻尼比和振型)取决于结构的形式、刚度、质量分布、材料特性及构造连接等因素。实际工程中的许多结构动力体系都可以简化抽象为由两个及两个以上的自由度来描述的振动模型。将一5层铝框架模型简化为离散的5自由度系统,利用小型电磁振动台对其进行模态测试,获得了其动力参数,并将试验结果与SAP2000模态分析结果进行对比,结果吻合度较好,验证了所构建的结构动力模态测试与演示系统的有效性。
The dynamic characteristics of the structure (natural frequency, damping ratio and mode shape) depend on the structure of the structure, stiffness, mass distribution, material properties and structural connections and other factors. Many of the structural dynamics in practical engineering simplify abstractions to vibration models that are described by two or more degrees of freedom. A 5-layer aluminum frame model was simplified to a discrete 5-DOF system. The small-scale electromagnetic vibrating table was used to perform modal testing. The dynamic parameters were obtained. The experimental results were compared with those of the SAP2000 modal analysis. The results were in good agreement Better, verify the effectiveness of the structural dynamic mode testing and demonstration system.