基于有限元分析的“短路”对阻尼性能影响研究  

Study on the influence of “short-circuiting” on damping performance based on finite element analysis

作　　者：李栋[1] 黄微波[1] 刘天铖 李向东[1] 鞠涛[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《工程建设》2017年第7期18-22,47,共6页Engineering Construction

摘　　要：通过分析比较,选用基于模态应变能理论的有限元分析方法。首先验证了方法的精确性,对于模型,前五阶结构固有频率最大误差率为2.3%,模态损耗因子最大误差率为8.4%;进而以"短路"面积为变量,对约束阻尼结构进行振动性能研究。研究结果表明:"短路"面积从75%减小到0,约束阻尼结构的固有频率降低,并且即使"短路"面积为25%,频率也较无"短路"面积降低了42%;损耗因子提高,且"短路"面积每减小25%,损耗因子都将增加一个数量级之多。Through analysis and comparison, the finite element analysis method based on modal strain energy theory was adopted. Firstly, the accuracy of the method was verified. For model, it is found that the maximum error rate of the first five natural frequencies and modal loss factors are only 2. 3% and 8. 4% respectively. Then, using ＂Short -circuiting＂ area as a variable, the vibration performance of constrained damping structure was researched. The results showed that with ＂ Short - circuiting＂ area decreasing from 75% to 0, the first five natural frequencies of the constrained damping structure were reduced,and even if the ＂short- circuiting＂ area of 25% ,the frequency was no ＂short - circuiting＂ area decreased by 42%. the loss factors were raised, and the ＂short - circuiting＂ area was reduced by 25% ,the loss factor was increased by an order of magnitude.

关 键 词：“短路”面积 约束阻尼结构 阻尼分析 模态应变能 复合损耗因子 最大位移 

分 类 号：TU352[建筑科学—结构工程]