本文選題：框架結構 + 結構振型�。� 參考：《華中科技大學》2015年碩士論文

【摘要】：隨著各行各業(yè)的迅速發(fā)展,作為一門交叉學科的模態(tài)分析技術得到了迅速的發(fā)展。在機械行業(yè)、航空航天、大型建筑結構工程等領域有著十分廣泛的研究和應用。在現(xiàn)有的試驗模態(tài)分析技術中,越來越重視對振型轉角的研究了。通常在分析結構的振型時,考慮較多的是結構的振型頻率和振型平移,而對于振型轉角的研究不是很多,實際上結構的振型轉角是結構振型研究的重要組成部分,并且在實際研究中有很多方面的應用。因此,如何通過試驗模態(tài)分析得到結構的振型轉角,也就成為了本文所要研究的主要內(nèi)容。文中首先利用有限元軟件ABAQUS建立了框架的有限元模型,使用ABAQUS的模態(tài)分析功能得到框架數(shù)值模型的前兩階振型,并輸出框架的振型頻率、結點振型位移和結點振型轉角。框架的有限元分析結果可以對接下來的試驗模態(tài)分析起到一定的指導作用。然后用鋼制構件拼接而成的框架模型進行試驗模態(tài)分析。利用DH-5922動態(tài)型號分析系統(tǒng)進行試驗,在試驗框架上合理布置傳感器,用力錘對框架施加激勵,通過DHDAS動態(tài)信號采集分析系統(tǒng)的試驗模態(tài)分析功能進行頻響分析,輸出得到框架的振型信息。包括振型頻率和測點處的振型位移。再然后根據(jù)梁柱單元位移模式,進行框架結構梁柱振型曲線擬合,建立相關方程組,將側點出的振型位移代入方程組進行計算,可以得到框架梁柱結點振型轉角。將計算得到的梁柱結點振型轉角值與數(shù)值分析得到的理論值進行對比,驗證了試驗結果的準確性。最后,分析了試驗方法和所得結論的不足,對下一步研究工作進行了展望。
[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.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU391

【引證文獻】

相關碩士學位論文 前1條

1 盛鵬程;基于LabVIEW的簇絨地毯織機軸系模態(tài)分析軟件設計[D];東華大學;2017年

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本文編號：1891514