摘要
针对调谐质量阻尼器(tuned mass damper,TMD)系统应用于轻型结构时易失调从而导致减振效果下降的问题,提出了一种新型形状记忆合金半主动TMD系统。该系统利用钢索悬吊质量块并承担其全部重量,使用有效截面为矩形的大尺寸镍钛形状记忆合金棒材,提供TMD系统水平面2个方向不同的抗弯刚度。为了研究该系统的半主动性能,进行了足尺形状记忆合金半主动TMD系统的自由振动试验,通过改变形状记忆合金的工作温度,研究了温度变化对TMD系统频率及阻尼比的影响。研究结果表明,控制形状记忆合金工作温度从-40~+80℃,TMD系统的频率随温度升高呈现升高趋势,而阻尼比随温度升高呈现下降趋势。将该新型形状记忆合金半主动TMD系统应用于受控结构中,一旦TMD失调,可以通过改变形状记忆合金的温度使其重新调谐。因此,设计的新型形状记忆合金TMD系统在轻型结构减振研究中具有一定的工程应用价值和前景。
Due to the problem that the tuned mass damper(TMD) system is easy to be off-tuned when applied to light structures,which leads to the decline of vibration reduction effect,a new shape memory alloy semi-active TMD system is designed in this paper.The system uses steel cables to suspend the mass to bear all its weight.Large shape memory alloy bars with rectangular effective cross sections are used to provide different bending stiffness in the two directions of the TMD system in the horizontal plane.In order to study the semi-active performance of the system,a full-scale shape memory alloy TMD system was subjected to free vibration tests in this paper.By changing the working temperature of the shape memory alloy,the influence of temperature change on the frequency and damping ratio of the TMD system was studied.The test results show that by controlling the working temperature of the shape memory alloy from-40 ℃ to 80 ℃,the frequency of the TMD system shows an increasing trend with temperature increases,while the damping ratio shows a decreasing trend with the temperature increases.The results show that the new shape memory alloy semi-active TMD system is applied to controlled structures,and once the TMD is off-tuned,it can be re-tuned by changing the temperature of the shape memory alloy.Therefore,the new shape memory alloy TMD system designed in this paper has certain engineering application value and prospect for the study of light structure vibration reduction.
作者
闫路悦
黄浩宇
李易
YAN Luyue;HUANG Haoyu;LI Yi(Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China;School of Engineering,Newcastle University,Newcastle Upon Tyne NE17RU,UK)
出处
《地震工程与工程振动》
CSCD
北大核心
2024年第2期81-88,共8页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51908007)。
