含电流变体砂浆复合梁结构振动固有频率的理论研究  

THEORETICAL STUDY ON NATURAL FREQUENCIES OF A CANTILEVER MORTAR BEAM WITH EMBEDDED ELECTRORHEOLOGICAL FLUID

作　　者：逯静洲[1] 李庆斌[2] 曲淑英[1] 

机构地区：[1]烟台大学土木工程系,烟台264005 [2]清华大学水利水电工程系,北京100084

出　　处：《振动与冲击》2006年第4期114-118,共5页Journal of Vibration and Shock

基　　金：国家杰出青年基金项目(50225927);教育部科学技术研究重点项目(地方205087);山东省优秀中青年科学家科研奖励基金(2005BS04010)

摘　　要：以修正的RL线弹簧模型为基础,通过定义等效裂纹长度,建立了含电流变体的砂浆复合悬臂梁的振动模型,并得到理论计算复合梁频率的特征方程。根据实验数据确定模型的参数,并编制MATLAB程序来模拟含电流变体的砂浆悬臂梁随电场强度变化时自振频率的变化规律。研究结果表明,该模型的模拟值与实验值吻合得较好,尤其对一阶频率的模拟效果最好。本项研究为电流变体在实际工程结构振动控制领域的应用奠定了实验和理论基础。Based on the revised line-spring(RL) model,a vibration model of a mortar cantilever beam with electrorheological fluid is reconstructed to calculate the eigenfrequencies by defining an equivalent crack length on the beam.Parameters of the model with various field-strengths and various frequencies are identified with test data and dicussed.Modeling is carried out with the MATLAB software to get the relation between the natural frequencies of the beam and the infensity of the electric field.The comparison between the experimental data and the predicted values by the simulation indicate that the proposed model is able to accurately describe the changing of frequencies due to different electric field-intensity,expecially for the first natural frequency.This study gives an experimental and theoretical basis for the application of ER fluid to vibration control in engineering structures.

关 键 词：电流变体 裂纹梁 频率 砂浆 

分 类 号：TU352.11[建筑科学—结构工程]