geometry optimization 中文意思是什麼
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In this paper, ackerman steering linkage of double - wishbone suspension is taken as the study object, choosing the splitting joint and steering lever joint to carry out the design of optimization the mathematics models are established based on the multi - body system dynamics, applying its analysis method of kinematics to study the mechanism kinetic principles owing to more spatial factors considered, and calling off many hypotheses affecting the accuracy, compared with the traditional methods, the models are better to reflect the realistic motion principles, the results are more exact and applicable moreover, the force analysis is applied to the conduct mechanism the analysis method of dynamics in the multi - body dynamics is applied to study the forces applied on every component, working out the constraint reaction force of up and down ball joints, and developing the current computation program in the end, produce the upper wishbone geometry model in the ansys software package, meshing and carrying out the fea, testifying if the intensity of the wishbone meet with the requirements
本文以雙橫臂獨立懸架的轉向傳動機構作為研究對象，選擇對斷開點和節臂球銷的位置進行優化設計，在此基礎上建立了基於多體系統動力學的導向機構和轉向傳動機構的數學模型，運用該學科的運動學分析方法研究機構的運動規律，編制了通用優化設計軟體。由於考慮了更多的空間因素，取消許多影響準確性的假設，因此建立的數學模型與傳統的方法相比更能反映實際運動規律，得到的優化結果也更加精確實用。此外，本文還針對導向機構進行受力分析，在建立該機構的空間動力學模型后，運用多體動力學中的動力學分析方法研究各個桿件的受力，計算出上下球鉸的約束反力，並開發出了相應的通用計算程序。 -
Recent researches extend the single axis approach to recover unknown rotation angles from uncalibrated image sequence based on a projective geometry approach. but these methods limited by the expense of computing fundamental matrices and trifocal tensors or of the nonlinear optimization involved in computing epipolar tangencies
因此，探索一種有效而簡單的演算法，求解單軸旋轉運動中的不變量和旋轉角度，是當前計算機視覺技術中的一個熱點研究課題，也是本文的研究目的和出發點。 -
By this means, user can recover the model with arbitrary geometry and topology. during the interaction, the reconstructed results can be computed and displayed instantly because we use an optimization - tree based symbolic and numeric hybrid optimization - solving approach
採用這種方法，系統在接受使用者的交互之後，可以實時地求解幾何參數與照相機投影矩陣，並即時地在一個三維窗口中顯示重建結果，做到真正的所見即所得。 -
Considering that the characteristics of our country ' s highway tunnels are always of long spans, tabular and of various geometry, by means of thorough analysis of the different problems existed in the design of support structures of the tunnels at present, this paper pays special attention to the two key problems, optimization method of form selection of structural section of the tunnel as well as the stability and bearing capacity of the support structures, in the design of the long and large tunnel on high - class highway, introduces the simplified complex - form optimum method in the structure optimization theory, discusses the optimum design model of lining section of highway tunnel with satisfying demands in building clearance, ventilation and load conditions, puts forward an optimization method of form selection of three different kinds of lining sectional forms ( i. e. single - center circle, three - center tabular circle and three - center sharp circle ), establishes a complete set of systematic optimum design the ory and method of long and large tunnel on high - class highway, develops the corresponding computer software used on the planned xuefeng mountain highway tunnel on shaoyang to huaihua expressway in hunan province for optimization of form selections of the structural sections, and obtains a series of relatively reasonable structural design parameters
本文針對我國公路隧道多為大跨度、扁平、幾何形狀呈多樣化的特點，通過深入分析目前隧道支護結構設計中存在的各種問題，抓住高等級公路長大隧道設計中隧道結構斷面的優化選型及隧道支護結構的穩定性與承載能力兩個核心問題，引入結構優化理論中的簡易復合形優化方法，深入探討了滿足建築限界、通風條件、受力狀態約束等條件下公路隧道襯砌斷面優化設計模型，提出了三種襯砌斷面形狀（單心圓、坦三心圓和尖三心圓）的優化選型方法，建立起一套完善的高等級公路長大隧道的系統優化設計理論與方法，並開發出相應的計算機程序，用於擬建的上海至瑞麗國道主幹線湖南省邵陽至懷化高速公路雪峰山長大高速公路隧道的結構斷面優化選型，得出了一系列較為合理的支護結構設計參數。 -
Compared with a delta wing aircraft, the double - delta wing configuration has better aerodynamic performance at high angles of attack. an operational analysis was introduced as a method for evaluating training effectiveness of trainer aircraft. approaches to the engineering estimation of aerodynamic characteristics for aircraft with a double - delta wing configuration were studied, and the procedures for determining aircraft performance indices formulated. taking training effectiveness as the objective function and geometric parameters of the wing platform as design variables, through a numerical multivariate optimization arithmetic, the conceptual design optimization for a certain fighter trainer aircraft with double - delta wing configuration was carried out under the constraints of tactical and technical requirements and interrelated geometry. agreement of a calculation example with engineering practice indicates that the optimal design has higher training effectiveness than the baseline design, and in addition, improves the structural force - bearing conditions
雙三角翼氣動布局比三角翼飛機具有更好的大攻角空氣動力特性.引入了評估教練機訓練效能的作戰分析法，研究了雙三角機翼布局飛機空氣動力特性的工程計算途徑以及飛機性能指標的確定方法.以訓練效能作為目標函數並選取機翼平面形狀的幾何參數為設計變量，採用多變量數值尋優方法，在戰術技術指標及相關幾何約束條件下，對某高級教練機的雙三角機翼氣動布局方案進行了優化選擇.算例表明最優方案不僅比原準方案具有更高的訓練效能，還改善了結構的受力情況，與工程實踐吻合 -
Optimization of secondary operations according to geometry of component made of low alloyed sintered steel
與低合金燒結鋼零件形狀相對應的后續處理條件最優化研究 -
We suggest that optimization of the tip geometry considerably improve the performance of the liquid metal ion source
從而為液態金屬離子源的設計提供了一個有效的輔助工具。 -
This paper improved these methods based on the requirements 0 there are two methods for conventional orbital control : one is algebra method which deals with the problems by optimization based on orbit geometry characteristics the first method is applied when we adopt impulsive control, but in the multiobjective cases the method has its limitation
傳統的軌道控制一般基於兩種方法，一種是代數優化方法，這種方法與衛星的軌道幾何特性相結合進行分析，將軌道的幾何特性和優化指標用代數方程的形式表示出來進行求解，這種方法主要用於沖量式控制。 -
After geometry optimization, their energy band structure, densities of states were calculated and analysised. we also calculated the model of doping cr, which can change the energy band structure of cdgeas2, the result is valuable for decreasing optical absorption. through the energy analysised, it was suggested that a germanium - on - arsenic anti - site defect was the most possible defect which may be associated with the 5. 5 micron absorption, the result of analysis are agreement with the research of epr, so the calculates are accurate
運用密度泛函理論計算，建立純砷化鍺鎘晶體的結構模型並對之進行結構優化，使理論模型更加接近真實結構，從而研究純砷化鍺鎘晶體的能帶結構和態密度、光學性質;分別建立砷空位模型（ vas - cdgeas2 ） ，鍺占砷位模型（ ge / as - cdgeas2 ） ，分別計算它們的能帶結構、態密度、光學性質。 -
Multi - objective optimization problem of this paper is transformed into a single - objective problem by weighting the objective functions of different design points. then the objective function is improved by the complex optimum method and the most aerodynamically favorable geometry that be provided with the better aerodynamic performance is obtained
對于多目標優化，通過對各個目標的權重組合實現單目標化，利用復合形優化方法對形成的目標函數進行最優化，從而得到具有良好氣動性能的翼型。 -
Numerical results all indicate that the two axisymmetric finite elements exhibit better numerical precision, excellent performance at the nearly incompressible limit and distortions of the element geometry, and element performances are improved after optimization. the layout of this thesis is follows
具體表現是：對畸變網格有很好的適應性；計算可靠，不發生poissonlocking現象；對雙線性等參元的粗網格精度有很好的改善。 -
The polarized continuum model is used to simulate the influence of the solvent environment on the solute molecule. in the first place, the geometry optimization of pna molecule in each solvent is redo by using the polarized continuum model on the base of density functional theory
首先，在密度泛函理論基礎上採用極化連續模型重新優化了pna分子在每種溶劑中的幾何結構，研究了不同溶劑對pna分子的幾何結構的影響。 -
According to the geometry model constructed in this paper, kinematics analysis, inverse kinematics with its optimization, analysis and calculation of dynamics are introduced. the resolution of matrix reverse transformation and gradient projection based on fake reverse matrix are used in the computation
建立了該手腕的幾何模型，針對該模型展開了運動學分析、逆運動學解的計算，計算使用了矩陣逆變換的解析法和基於偽逆陣的梯度投影法兩種方法。 -
On the basis of association of finite element computation with optimization design and analysis of sensitivity of cable force variation to structural response and objective function ' s sensitivity, an optimization method for rationally bridge - completing cable force of large - span cable - stayed bridge was presented, where the structural internal force, linear control condition, and nonlinearity influence of structural geometry were taken into account in the entire process of optimization
摘要將有限元計算與優化設計分析相結合，在索力變化對結構響應和目標函數敏感性分析的基礎上，綜合考慮結構內力、線形控制條件，提出一種全過程計入結構幾何非線性影響的大跨斜拉橋合理成橋索力優化方法，採用一階分析法對成橋索力進行迭代優化。 -
At the meantime, the rock mass may alternate between loading and unloading and it exists in certain kind of liquid, such as surface water, unconfined water, confined water etc for its intrinsic crannies. the practical rock mass concerned project must solve the key stability pr oblem after the understanding of the complicated mechanical characteristic and the deformation trends to guide the following project design and construction for the demand of security, economy, feasibility and validity. however, the intrinsic nonlinearness and complexity of the engineering rock mass become the main difficulty to predict the stability and deformation, the corresponding structure design must ensure enough safety with all the determinate or random force combination, so a model without the geometry distortion and constitutive equation warp is necessary to be built for the quantificational analysis of practical structure ' s stress, for the simulation of the real process and for the determinate evaluation system and optimization
由於實際工程巖體其固有的非線性和復雜性，使得求解對應的諸如其穩定性、變形等問題面臨較大的困難，而有關的工程結構的設計必須保證該結構在外來因素的作用下具有足夠的安全度、經濟性和合理性，這必然要求對巖體及其工程結構的受力與變形有一套量化評判體系和優化技術，抓住實際工程問題的本質特徵並建立可行的符合幾何模擬、本構模擬、受力模擬、過程模擬四原則的求解模型，通過該模型的數值模擬成果來指導巖體工程的設計、施工及運營、管理；而巖體結構面的存在使得基於傳統連續介質力學理論的理論分析和數值模擬面臨巨大的挑戰，物理模擬的試驗周期和成本也大大增加，而巖土體工程問題則成為典型的數據有限、了解程度有限類問題，這類問題的解決需要綜合應用理論分析、經驗判斷、物理模擬和數值模擬等方法，數值模擬可以完成目前許多技術手段無法完成的實驗，如參數控制，復雜條件下的邊界條件的處理，同時數值模擬具有高可重復性，且數值模擬的成本和人力開銷等遠低於物理模擬，因此研究巖土體工程問題的流形元數值模擬方法是一項具有理論和實際工程應用價值的重要課題。 -
In upper level optimization, the thickness and geometry factors of composite skins and webs as well as other structural dimensions are taken as design variables. then, considering the behavior constraints and the side constraints, the structural mass is minimized by the mathematical programming technique. in lower level optimization, the mathematical programming technique or the genetic algorithm ( ga ) is used to search the practical stacking sequence of composite skins and webs to realize the given thickness and geometry factors from upper level optimization
底層優化設西北工業大學博士學位論文計以復合材料蒙皮和腹板等層合板各分層的厚度（或鋪層數） 、鋪層角和鋪層順序為設計變量，以層合板的幾何因子與頂層優化設計給出的最優幾何因子之間的誤差最小為目標，考慮層合板厚度和製造工藝性約束，採用數學規劃方法或遺傳演算法（ geneticalgorithm ，簡稱ga ）求出底層最優設計變量。 -
According to theory of fractal geometry, the relations of fragmentation distribution of blasting lumps and the fractals of fragmentation was got, and then established the relation of coal blasting lumps fragmentation of fractal value and parameters of blasting according to field, as well as guides the optimization of blasting parameters, and controls fragmentation of coal blasting, in order to estimate and forecast fragmentation before blasting
摘要根據分形幾何理論得出爆堆塊度分佈和塊度分維數的關聯關系，然後根據現場爆堆塊度分佈建立爆堆塊度分維值與爆破參數的關系，從而達到指導人們進行爆破參數優化，拉制煤體爆破塊度，進行爆前的塊度估算和塊度預測的目的。 -
The last chapter comes to some conclusions about the finite element pre - procession techniques and the main research problems of this paper ( the pattern module ' s method and the geometry optimization of the grid quality ), points out the existing problems, and refers to the work direction in the future
最後一章得出有關有限元前處理技術利本文主要研究的問題（模板法利網格質量的幾何優化）的一些結論，揭示了尚還存在的問題並指出了繼續努力的方向。 -
In order to study the regeneration mechanism of dpf in detail, we still need a mathematical model of the channel unit, which present temperature field and the soot reaction rate of the channel. finally, it points out the influences of various factors to the regeneration process by computing the numerical solution of model under different boundary conditions and geometry parameters, such as the initial temperature, the gas flow rate, the oxygen concentration, the sediment quantity and the wall thickness of the filters, and so on. in this way, the paper provides theoretical guidance for optimization design of the dpf
首先研究了干凈壁流式過濾體的加熱特性，然後在加熱和燃燒理論的基礎上建立了微粒捕集器再生過程的數學模型，並對模型進行了數值計算，得到了捕集器內部的三維溫度場分佈以及溫度梯度分佈，結果與實驗值吻合較好，驗證了模型的正確性;為了詳細的研究微粒捕集器的再生機理，建立了孔道單元數學模型，得到了孔道內的溫度場分佈和微粒反應速率分佈;最後，通過求解模型在不同邊界條件和不同幾何參數下的數值解，分析了各種因素對再生過程的影響，如過濾體初始溫度、過濾體內氣流的流動速率、氧濃度、微粒沉積量以及過濾體壁面厚度，為微粒捕集器的優化設計提供理論指導。 -
The method has three features : 1 ) the dimensions used in commercial cad system are selected to be the design variables of shape optimization. 2 ) a mapping between geometry objects and finite element objects such " as meshes, structure properties is set up to assist in defining finite element models on geometries. 3 ) an automatic mesh generator and a method by which structure properties is assigned from geometry objects to finite element objects automatically are used to update finite element models during the optimization process
通過將幾何模型的設計參數作為有限元模型的形狀控制參數，實現了有限元模型的參數定義；通過建立幾何模型與有限元網格及模型物理描述之間的關聯，實現了基於幾何造型的有限元模型定義；利用基於幾何模型的全自動網格生成方法及物理描述分派方法，實現了有限元模型的自動生成及應參數變化的自動更新；並以參數化造型軟體mdt為支撐平臺，開發了相應的參數化有限元建模程序。
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