Finite Element Method is an important means of engineering subject and has been proved to be a common method in many subjects. However, disadvantages still remained. During the structural analysis, large amount of high-order units were used in order to ensure the precision of arithmetic solution when using Finite Element Method to do discrete processing. This will cause high order of coefficient matrix of corresponding equation group.

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This paper is devoted to solving linear saddle point problems, Specifically, We consider nonsymmetric systems, written as usual in block form, where the upper left block is an invertible linear operator with positive definite symmetric part. Such saddle point problems arise, for example, in certain finite element and finite difference discretizations of NavierStokes equations, Oseen equations, and mixed finite element discretization of second order convection-diffusion problems.

中文題名求解鞍點問題的迭代方法副題名外文題名論文作者馮麗紅導(dǎo)師曹志浩教授學(xué)科專業(yè)計算數(shù)學(xué)研究領(lǐng)域\研究方向?qū)W位級別博士學(xué)位授予單位復(fù)旦大學(xué)學(xué)位授予日期2002 論文頁碼總數(shù)87頁關(guān)鍵詞鞍點問題迭代方法網(wǎng)格離散線性方程組館藏號BSLW /2003 /O241 /15 論文針對鞍點問題的求解分析了一些典型的快速算法国产又粗又黄录像。

Element order is an important quantity in finite groups,which influences the integral property of finite groups profoundly.

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The spectral element method, which combines the high-order precision of spectral methods and the geometrical flexibility of finite element methods, has achieved great success and is becoming a useful tool for investigation of such equations.

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For the condensed dynamic stiffness matrix in finite models which have finite number of freedom and any dynamic stifmess matrix of infinite system, the element of them is a transcendental function of eigenfrequency. And therefore transcendental eigenvalue problem is needed to be solved in order to get the natural frequency and modes of vibration.

對于有限自由度系統(tǒng)的縮聚動剛度矩陣和無限自由度系統(tǒng)的任何動剛度矩陣阿拉伯三级片视频，其元素是頻率的超越函數(shù)，因此求解結(jié)構(gòu)固有頻率及其振型歸結(jié)為求解超越特征值問題干bb综合。

We constructed a finite volume scheme of fifth order Hermite type with high accuracy for twopoint boundary value problems, choosing trial and test spaces as the fifthorder finite element space of Hermite type and the piecewise linear function space respectively. We didn't use higher derivatives as interpolation conditions, which is the same as the thirdorder finite element of Hermite type, but the scheme obtained had higher accuracy.

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In order to determine the solution set of the equation , by the means of meet-irreducible element and irredundant finite meet-decomposition, we first obtain the maximal solutions to the simple equation in the case that b has an irredundant finite meet-decomposition, and then consider the relation between the equation and the equation , based on this, we obtain the maximal solutions to the equation in the case that each element of the matrix B has an irredundant finite meet-decomposition and so determine its solution set completely.

為了確定方程的解集91制服丝袜，本文利用交既約元與不可縮短的有限交分解等工具，同樣地先求出簡單形式的型矩陣方程的所有極大解国产黑色丝袜在线观看下，然后討論方程與方程之間的關(guān)系三级黄色在线，在此基礎(chǔ)上，在B的每個元素均有不可縮短的有限交分解的情況下一级片视屏，求出了方程的所有極大解人人专区人人免费，從而完全確定了方程的解集。

In order to investigate buckling mode, buckling load and failure mode of structure, shear experiments were conducted for stiffened thin-walled composite plate. Finite element method was also used to analyze the buckling behavior of that composite structure. Analysis results reveal buckling mode and buckling loading of finite element analysis are accordable with experimental results.

通過對復(fù)合材料薄壁加筋板結(jié)構(gòu)進(jìn)行剪切載荷下的屈曲試驗研究欧美性爱特色特黄一级视频，得到結(jié)構(gòu)的屈曲模態(tài)美国一级视频、屈曲失穩(wěn)載荷以及破壞形式，并通過有限元方法對結(jié)構(gòu)的屈曲進(jìn)行數(shù)值分析国内自拍3p视频，分析得到的復(fù)合材料薄壁加筋板結(jié)構(gòu)的屈曲模態(tài)和試驗結(jié)果一致国产精品久久久精品日日，屈曲載荷與試驗結(jié)果吻合較好。

In this dissertation the"Penalty"finite element method was employed to compute the velocity of the three-dimensional flow of power-law fluid in a profile die. In order to decrease the needed computer memory and raise the stability of numerical simulation, a set of decoupled methods such as PFEM, pseudo-body force method and transformation of momentum equation to the elliptic equation was developed to establish the general finite element equations to compute the distributions of velocity and viscoelastic stress of the three-dimensional viscoelastic flow of the Phan ThienTanner fluid in a profile die. During numerical simulation of the extrudate swell of the PTT fluid, the flow in the die and out of the die was analyzed separately, which demands less computer memory. The key techniques used in numerical simulation of the three-dimensional extrusion from dies such as decision of boundary conditions, creation of initial velocity field, selection of penalty factor, high Weissenberg number problem , regeneration of the free surface were studied in detail.

中文題名聚合物異型材口模擠出三維流動研究副題名外文題名 Study on three-dimensional flow of polymer melts during the process of profile extrusion from dies 論文作者涂志剛導(dǎo)師柳和生包忠詡教授學(xué)科專業(yè)材料加工工程研究領(lǐng)域\研究方向?qū)W位級別博士學(xué)位授予單位南昌大學(xué)學(xué)位授予日期2001 論文頁碼總數(shù)148頁關(guān)鍵詞擠出成型聚合物材料擠出口模聚合物異型材館藏號BSLW /2003 /TQ320 /9 本文建立了求解擠出口模內(nèi)冪律流體流動速度場的通用三維罰有限元模型欧美激情丁香综合；對于非線性粘彈性的Phan Thien-Tanner流體，為了降低模擬計算對計算機硬件的要求操av在线，并使模擬計算更加穩(wěn)定国内视频在线视频自拍区，采用了一種去耦算法你懂得黄色网址，包括罰有限元方法、擬體力方法和動量方程的橢圓類方程轉(zhuǎn)化方法羞羞视频免费播放，并建立了求解速度場和粘彈性應(yīng)力場的總體有限元方程亚洲精品在线小视频；對于PTT流體的擠出脹大問題，提出了擠出脹大熔體口模內(nèi)外分離模擬法免费人成视频在线观看视频网站，這樣可以顯著降低數(shù)值模擬對計算機硬件的要求一本无码字幕在线少妇人妻。

In order to verify the accuracy of heat transfer coefficient,2D nonlinear finite element axisymmetric model is established by the means of finite element software MSC.Marc, which is utilized to simulate the transient temperature field coupled with phase transformation process and nonlinear synthetic surface heat transfer coefficient of several typical steels in the different quenchants.

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