本文選題：NBI綜合測試臺 + 有限元��； 參考：《合肥工業(yè)大學》2012年碩士論文

【摘要】：有限元技術作為性能分析與仿真的一種非常有效的手段，，能夠輕松的求解各種復雜工程的結構問題�，F(xiàn)代結構優(yōu)化理論和方法是以現(xiàn)代力學理論與數(shù)學優(yōu)化算法為理論基礎提出的新的理論和方法，為工程設計人員尋出最優(yōu)化方案提供了理論依據(jù)。通過將有限元技術與現(xiàn)代結構優(yōu)化理論和方法進行有機結合，可以有效提高設計水平、減少原材料消耗、縮短產品設計周期、增強產品的市場競爭力。本文通過利用有限元技術對NBI綜合測試臺真空筒體的結構進行分析，驗證真空筒體的穩(wěn)定性和安全可靠性，同時結合現(xiàn)代結構優(yōu)化理論和方法對真空筒體的結構進行優(yōu)化和改進，達到減少重量、節(jié)約成本的目的。 首先對NBI綜合測試臺真空筒體進行了基本力學分析，明確了真空筒體的受載情況；其次利用有限元分析軟件建立了真空筒體的有限元模型，在以上基礎上對真空筒體進行了靜力分析和模態(tài)分析的相關研究。 通過對真空筒體的靜力分析和研究，驗證了真空筒體結構的穩(wěn)定性和安全可靠性。通過對計算結果的分析和研究，得知真空筒體的最大應力遠小于材料的許用應力，得出真空筒體結構滿足其強度和剛度要求的結論。并同時根據(jù)分析結論，提出了對真空筒體的結構改進方案。 通過對真空筒體的模態(tài)分析和研究，求解出了真空筒體前6階模態(tài)下的固有頻率，通過對固有頻率的分析和研究，為真空筒體在工作狀態(tài)時有效地避免共振等情況的發(fā)生提供了理論依據(jù)，并提出了有效地避免共振發(fā)生所應采取的措施。 在有限元分析的基礎上，根據(jù)提出的結構改進方案，建立了真空筒體的尺寸優(yōu)化模型，尋求出了最優(yōu)化方案。通過對最優(yōu)化方案進行相應的有限元分析，并將優(yōu)化前后的真空筒體的結構性能進行比較，分析得出優(yōu)化后的真空筒體結構不僅在性能上滿足要求，并且有效地減輕了真空筒體的重量，達到了節(jié)約成本的目的。
[Abstract]:As a very effective means of performance analysis and simulation, finite element technology can easily solve various structural problems of complex engineering. Modern structural optimization theory and method is a new theory and method based on modern mechanics theory and mathematical optimization algorithm, which provides a theoretical basis for engineering designers to find out the optimization scheme. By combining finite element technology with modern structural optimization theory and method, the design level can be improved effectively, the consumption of raw materials can be reduced, the design cycle of products can be shortened, and the market competitiveness of products can be enhanced. In this paper, the structure of vacuum cylinder of NBI comprehensive test bench is analyzed by using finite element technique to verify the stability and safety of vacuum cylinder. At the same time, the structure of vacuum cylinder is optimized and improved with modern structural optimization theory and method, so as to reduce the weight and save the cost. Firstly, the basic mechanics analysis of vacuum cylinder of NBI comprehensive test bench is carried out, and the loading situation of vacuum cylinder is clarified. Secondly, the finite element model of vacuum cylinder is established by using finite element analysis software. On the basis of above, the static analysis and modal analysis of vacuum cylinder are studied. Through the static analysis and research of vacuum cylinder, the stability and safety reliability of vacuum cylinder structure are verified. Through the analysis and study of the calculation results, it is found that the maximum stress of the vacuum cylinder is far less than the allowable stress of the material, and the conclusion that the vacuum tube structure meets the requirements of its strength and stiffness is obtained. At the same time, according to the conclusion of analysis, the structure improvement scheme of vacuum cylinder is put forward. Through the modal analysis and research of vacuum cylinder, the natural frequency of the first six modes of vacuum cylinder is solved, and the natural frequency is analyzed and studied. This paper provides a theoretical basis for the vacuum cylinder to avoid resonance and other situations effectively, and puts forward the measures to be taken to avoid resonance effectively. On the basis of finite element analysis, the size optimization model of vacuum cylinder is established according to the structure improvement scheme proposed, and the optimization scheme is found out. Through the finite element analysis of the optimization scheme and the comparison of the structural performance of the vacuum cylinder before and after the optimization, it is concluded that the optimized vacuum cylinder structure not only meets the requirements in performance. The weight of vacuum cylinder is reduced effectively and the cost is saved.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH122;TP391.7

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