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  本文選題：單軸振動　切入點：三軸振動　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：振動試驗是鑒定結(jié)構(gòu)或儀器設(shè)備能否承受預(yù)計的振動環(huán)境的一種必要手段。與單軸振動試驗相比,三軸振動試驗由于能準(zhǔn)確快速方便的模擬實際振動環(huán)境而受到廣泛重視,近年來三軸振動臺也逐漸問世。然而由于其起步較晚,目前無統(tǒng)一的三軸振動試驗標(biāo)準(zhǔn)。本論文從使三軸振動的應(yīng)力響應(yīng)與單軸振動應(yīng)力響應(yīng)等效為出發(fā)點,裁剪三軸振動的載荷譜,研究三軸振動的試驗條件,具體完成工作如下:首先是基礎(chǔ)力學(xué)的相關(guān)理論以及有限元仿真技術(shù)的研究,并且簡要敘述了ANSYS Workbench的優(yōu)化功能。通過模態(tài)分析算例、隨機振動分析算例和ANSYS Workbench的載荷優(yōu)化分析算例驗證了本文使用軟件的正確性,為后續(xù)分析提供了理論基礎(chǔ)。其次是簡單結(jié)構(gòu)的三軸隨機振動試驗條件的研究。對簡單懸臂梁結(jié)構(gòu)進行單軸與三軸隨機振動的應(yīng)力響應(yīng)對比分析,得出三軸振動比任一單方向的單軸振動響應(yīng)應(yīng)力都大的結(jié)論;運用載荷優(yōu)化分析,裁剪三軸振動的輸入載荷譜,并分析裁剪前后載荷譜的均方根值的比值與裁剪前后等效應(yīng)力的均方根值的比值的關(guān)系,為后續(xù)的有限元分析提供依據(jù)。之后是CAD/CAE協(xié)同仿真以及夾具對系統(tǒng)模態(tài)振動的影響的研究。由于本論文艙段模型較為復(fù)雜,有限元分析時需要先在三維繪圖軟件Pro/E中進行簡化處理,然后導(dǎo)入ANSYS Workbench中進行有限元分析,因此本文討論了CAD/CAE的協(xié)同建模仿真。同時從理論上分析了夾具對整個試驗系統(tǒng)的影響,為下文分析夾具對系統(tǒng)的振動特性的影響提供了指導(dǎo)。最后是典型艙段結(jié)構(gòu)的三軸隨機振動試驗條件的研究。給出了艙段結(jié)構(gòu)的有限元模型,分析了夾具對艙段系統(tǒng)的振動特性的影響,然后對艙段結(jié)構(gòu)進行單軸與三軸隨機振動響應(yīng)的應(yīng)力響應(yīng)對比分析,基于載荷優(yōu)化方法,裁剪三軸同時加載的載荷譜,給出三軸隨機振動試驗的裁剪方案。
[Abstract]:Vibration test is a necessary means to determine whether the structure or equipment can withstand the predicted vibration environment. Compared with the uniaxial vibration test, triaxial vibration test is paid more and more attention because of its ability to simulate the actual vibration environment accurately, quickly and conveniently. In recent years, triaxial vibration table has gradually come out. However, due to its late start, there is no unified standard of triaxial vibration test. This paper starts from the point of view of making the stress response of triaxial vibration equivalent to that of uniaxial vibration. The load spectrum of triaxial vibration is cut and the experimental conditions of triaxial vibration are studied. The work is as follows: firstly, the related theory of basic mechanics and finite element simulation technology are studied. The optimization function of ANSYS Workbench is briefly described. The correctness of the software is verified by the modal analysis example, random vibration analysis example and load optimization analysis example of ANSYS Workbench. It provides a theoretical basis for further analysis. Secondly, the experimental conditions of triaxial random vibration of simple structures are studied. The stress responses of simple cantilever structures under uniaxial and triaxial random vibration are compared and analyzed. It is concluded that the response stress of triaxial vibration is greater than that of any uniaxial vibration, and the input load spectrum of triaxial vibration is cut by using load optimization analysis. The relationship between the ratio of the root mean square value of the load spectrum before and after cutting and the ratio of the root mean square value of the equivalent stress before and after cutting is analyzed. It provides the basis for the subsequent finite element analysis. Then there is the study of the CAD/CAE co-simulation and the influence of the fixture on the modal vibration of the system. Because of the complexity of the cabin model in this paper, The finite element analysis needs to be simplified in 3D drawing software Pro/E, and then imported into ANSYS Workbench for finite element analysis. Therefore, this paper discusses the collaborative modeling and simulation of CAD/CAE, and theoretically analyzes the influence of fixture on the whole test system. It provides guidance for analyzing the influence of fixture on the vibration characteristics of the system below. Finally, the experimental conditions of triaxial random vibration of typical cabin structure are studied. The finite element model of cabin structure is given. The influence of fixture on the vibration characteristics of cabin system is analyzed, and then the stress response of single-axis and three-axis random vibration response of cabin structure is compared and analyzed. Based on the load optimization method, the load spectrum of triaxial loading at the same time is cut. The cutting scheme of triaxial random vibration test is given.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB534

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本文編號：1557941