钢框架结构梁柱结点振型转角试验模态分析

发布时间：2018-05-15 07:17

本文选题：框架结构 + 结构振型　；参考：《华中科技大学》2015年硕士论文

【摘要】：随着各行各业的迅速发展,作为一门交叉学科的模态分析技术得到了迅速的发展。在机械行业、航空航天、大型建筑结构工程等领域有着十分广泛的研究和应用。在现有的试验模态分析技术中,越来越重视对振型转角的研究了。通常在分析结构的振型时,考虑较多的是结构的振型频率和振型平移,而对于振型转角的研究不是很多,实际上结构的振型转角是结构振型研究的重要组成部分,并且在实际研究中有很多方面的应用。因此,如何通过试验模态分析得到结构的振型转角,也就成为了本文所要研究的主要内容。文中首先利用有限元软件ABAQUS建立了框架的有限元模型,使用ABAQUS的模态分析功能得到框架数值模型的前两阶振型,并输出框架的振型频率、结点振型位移和结点振型转角。框架的有限元分析结果可以对接下来的试验模态分析起到一定的指导作用。然后用钢制构件拼接而成的框架模型进行试验模态分析。利用DH-5922动态型号分析系统进行试验,在试验框架上合理布置传感器,用力锤对框架施加激励,通过DHDAS动态信号采集分析系统的试验模态分析功能进行频响分析,输出得到框架的振型信息。包括振型频率和测点处的振型位移。再然后根据梁柱单元位移模式,进行框架结构梁柱振型曲线拟合,建立相关方程组,将侧点出的振型位移代入方程组进行计算,可以得到框架梁柱结点振型转角。将计算得到的梁柱结点振型转角值与数值分析得到的理论值进行对比,验证了试验结果的准确性。最后,分析了试验方法和所得结论的不足,对下一步研究工作进行了展望。
[Abstract]:With the rapid development of various industries, modal analysis technology, as an interdisciplinary subject, has been developed rapidly. In the mechanical industry, aerospace, large-scale structural engineering and other fields have a very wide range of research and application. In the existing experimental modal analysis technology, more and more attention has been paid to the study of the mode rotation angle. Usually, when analyzing the mode shape of the structure, the mode frequency and mode translation are considered more, but the research on the mode rotation angle is not much. In fact, the mode rotation angle of the structure is an important part of the structure mode research. And there are many applications in practical research. Therefore, how to obtain the mode rotation angle of the structure by experimental modal analysis has become the main content of this paper. In this paper, the finite element model of the frame is established by using the finite element software ABAQUS. The first two modes of the numerical model of the frame are obtained by using the modal analysis function of ABAQUS, and the frequency of the mode of the frame, the displacement of the nodal mode and the rotation angle of the nodal mode are outputted. The finite element analysis results of the frame can play a guiding role in the following experimental modal analysis. Then the experimental modal analysis is carried out with the frame model of steel components. The DH-5922 dynamic model analysis system is used to carry out the test, the sensors are reasonably arranged on the test frame, the force hammer is applied to the excitation of the frame, and the frequency response analysis is carried out through the test modal analysis function of the DHDAS dynamic signal acquisition and analysis system. Output the mode information of the frame. It includes the mode frequency and the mode displacement at the measuring point. Then according to the displacement model of Liang Zhu element, the Liang Zhu mode curve fitting of frame structure is carried out, and the related equations are established. The mode displacement of the side point is substituted into the equation group to calculate the mode rotation angle of the frame Liang Zhu node. The accuracy of the experimental results is verified by comparing the calculated Liang Zhu node mode rotation angle with the theoretical values obtained by numerical analysis. Finally, the deficiency of test method and conclusion is analyzed, and the future research work is prospected.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391

【引证文献】