本文選題：動靜態(tài)特性　切入點：有限元　出處：《沈陽工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文針對結(jié)構(gòu)優(yōu)化展開研究，對立柱以及床身動、靜態(tài)特性進行了分析并展開了優(yōu)化設(shè)計研究。主要研究工作包括： （1）介紹了機床優(yōu)化發(fā)展情況，對于有限元理論及優(yōu)化原則進行了介紹。 （2）對某加工中心進行整機CAD建模，，基于其實際加工情況對其主要部件的受力進行了計算，對其立柱與床身進行了動、靜態(tài)計算。 （3）利用變量化分析的方法，研究了元結(jié)構(gòu)和框架尺寸的結(jié)構(gòu)形式及結(jié)構(gòu)尺寸。分析了元結(jié)構(gòu)的出砂孔數(shù)目、形狀、大小，筋格的邊長、厚度以及各邊長比例對其基頻影響；同時還研究了立柱、床身基本框架結(jié)構(gòu)與其低階固有頻率的關(guān)系，獲得了框架尺寸與低階固有頻率之間的關(guān)系規(guī)律。應(yīng)用元結(jié)構(gòu)思想對立柱、床身結(jié)構(gòu)進行了優(yōu)化設(shè)計。 （4）闡述了參數(shù)化建模的思路，并基于此思路對機床的立柱進行了參數(shù)化模型的建立。 （5）根據(jù)前面建立的參數(shù)化CAD模型導(dǎo)入ANSYS Workbench變?yōu)閰?shù)化CAE模型。選擇筋板厚度為設(shè)計變量，將設(shè)計變量的參數(shù)分兩次進行研究，最后綜合考慮優(yōu)化結(jié)果。以立柱質(zhì)量最輕和最大變形量最小為優(yōu)化目標(biāo)，以各筋板厚度為優(yōu)化變量，以第一階固有頻率為約束條件，對其進行多目標(biāo)優(yōu)化，得到Pareto優(yōu)化解集，從而得出優(yōu)化模型，結(jié)果表明，優(yōu)化結(jié)果可靠有效。
[Abstract]:In this paper, the structural optimization is studied, the dynamic and static characteristics of the column and the bed are analyzed and the optimization design is studied. The main research work includes:. The development of machine tool optimization is introduced, and the finite element theory and optimization principle are introduced. 2) based on the CAD model of a machining center, the force of its main parts is calculated, and the dynamic and static calculation of its column and bed is carried out. (3) using the method of variational analysis, the structural form and size of element structure and frame size are studied, and the effects of the number, shape, size, side length, thickness and ratio of each side length of element structure on its fundamental frequency are analyzed. At the same time, the relationship between the basic frame structure of column and bed and its low order natural frequency is studied, and the relationship between frame size and low order natural frequency is obtained, and the optimum design of column and bed structure is carried out by using the idea of element structure. (4) the idea of parameterized modeling is expounded, and the parameterized model of machine tool column is established based on this idea. 5) according to the parameterized CAD model established before, the ANSYS Workbench is transformed into the parameterized CAE model. The thickness of the stiffened plate is selected as the design variable, and the parameters of the design variable are studied in two stages. Finally, the optimization results are considered synthetically. With the minimum of column mass and maximum deformation as the optimization objective, the thickness of each stiffened plate as the optimization variable and the first order natural frequency as the constraint condition, the multi-objective optimization of the column is carried out, and the Pareto optimization solution set is obtained. The results show that the optimization results are reliable and effective.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG502.3

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