geometric boundary 中文意思是什麼
geometric boundary
解釋
幾何邊界-
The geometric nonlinear analysis of three types of large - span annular cable truss structures is put forward by using commercial fem program. their static properties in deferent load case are concluded, and some suggestions for actual projects are also presented. base on the prime realization of its static property, parameter analysis of its static property is done consisting of deferent number of truss, deferent height of truss, deferent scale of height of masts, deferent boundary condition and deferent magnitude of pre - stress in deferent load case
本文利用通用有限元軟體ansys對大跨度環形空腹索桁結構體系中三種典型的結構（即內外圈都為圓形、外圈圓形內圈橢圓形、內外圈都為橢圓形的三種外形的結構）進行了幾何非線性分析，總結出各自在不同荷載工況下的靜力性能，並提出一些有實際工程意義的建議。 -
With energy method, we can conveniently control the precision of the objective surface and add boundary constraints for preserving the model ' s global geometric continuity, but this method is very time - consuming. stiffness adjustment is the easiest method to be implemented and the fairing result is always satisfying except that the acquired surface editing is awkward. based on wavelets decomposition, the surface model ' s data size can be compressed efficiently and this method is running fast, however, the error and boundary constraints are difficult to be considered
其中基於能量原理的光順方法能夠方便地控制目標曲面的精度和邊界條件，從而能夠實現曲面模型的全局連續性，但是能量法的運算速度還有待提高；剛度調整法實現簡單，但是生成的曲面的可編輯性較差；小波分解方法計算速度很快，能夠有效地實現數據壓縮，但是其逼近誤差和邊界條件卻難于控制。 -
Nurbs surfaces with single interior knots are simple and used widely. the thesis main aims at biuquartic, biquintic, k x fc - degree b - spline surfaces and bicubic nurbs with single interior knots. one of the contributions is to apply knot refinement and the geometric continuous conditions of bezier surfaces to deduce the geometric continuous constraints of nurbs patches and obtain the intrinsic equations of common boundary curves, where the intrinsic equations are the special phenomena of nurbs surfaces
節點向量是內部單節點的nurbs曲面是最簡單也是最常用的，本文重點針對單節點的雙四次、雙五次和雙k次b樣條曲面及雙三次nurbs曲面，運用節點插入技術和b zier曲面的幾何連續理論成果，導出了它們之間的幾何光滑拼接條件，同時得到了公共邊界曲線所必須滿足的本徵方程，其中本徵方程是nurbs曲面所獨有的現象。 -
The geometric explanation of the image principle presented in “ a new method to determine the transient stability boundary using nonlinear theory 1 is given. a theorem to determine the critical clearance time is derived. from the calculation results of two examples, the correctness of the theories put forward by this paper and paper 1 is verified
對論文《運用非線性系統理論確定電力系統暫態穩定域的一種新方法》 1中所提出的映射機理作了幾何解釋；提出了確定電力系統臨界切除時間的定理；通過對一簡單電力系統和電科院6機22節點算例的計算，驗證了本文及文1所提出的理論的正確性。 -
In numerical computation aspect, by implying new computational geometric field, computation error caused by boundary condition was decreased
在數值計算方面，本文採用了新的計算域，減小了由於邊界條件造成的計算誤差。 -
To explain the inverse hall - petch relation in nanocrystalline metals, a geometric model is made, which assumes that the grains are spherical crystals, and the thick of grain boundary is considerable compared with the microcrystalline metals
提出了一個球形晶體純晶界滑移幾何模型，得到出現反hall - petch關系的條件和小晶粒尺寸條件納米晶金屬材料的強度極限。 -
On the assumption of ignoring the distortion of thickness, this paper determines the rough shape by the geometric modeling method of equal area developing using mixed mesh cell of triangle and quadrangle for the first time, presents the equal area developing arithmetic of quadrangle - triangle. on the virtual geometric symmetry axis, we puts forward the method of determining the developed coordinate of the point on the base band in the development of using regular quadrangle cell, determines the developed shape of internal structure in plane utilizing point - to - point mapping theory. furthermore, we realize the approximate developing of undeveloped - irregular boundary surface using a few triangle cells
本文結合型號研製中小曲率機翼整體壁板類零件坯料展開課題，基於板料厚向變形忽略不計的先驗假設，首創混合四邊形-三角形網格等面積展開的幾何模擬法確定壁板類零件毛坯外形，給出了混合四邊形-三角形網格等面積展開演算法；提出了虛擬分割線的概念，採用虛擬幾何對稱軸，給出了規整四邊形單元展開基帶上結點的計算方法；採用映射原理和求交演算法確定了壁板內部結構信息的展開定位。 -
Using the means of similar analysis, this paper derives such similar standard and ratio as geometric similar, time similar, dynamic similar, movement similar, and material similar with geological structure physical model, discusses the experimental model, means, materials and the boundary condition of geological structure physical modeling experiment, points out that they might simulate various complex geological structure patterns with different materials under the definitive boundary condition
摘要把地質構造物理模擬實驗模型抽象為動力相似問題進行討論，用相似理論分析導出了地質構造物理模型的相似準則並給出了相似比，認為幾何相似、動力相似、材料相似和邊界相似是反映地質構造現象的主要相似條件，時間相似、運動相似和其他相似條件是反映地質構造現象的次要相似條件。 -
Rcs of facets of targets coated ram was resolved by combining impedance boundary condition ( ibc ) and geometric optics ( go ) and rcs of those edges were approximated by computing the rcs of edges of impedance wedge through method of equivalent currents
其中，塗覆目標面元的散射場是通過結合阻抗邊界條件和幾何光學法（ go ）而得到；而塗覆目標棱邊的散射場則是通過等效電磁流法求解阻抗劈的邊緣繞射場近似得到的。 -
The buckling and ultimate strength of ship plating normally depend on a variety of influential factors, namely geometric / material properties, loading characteristics, initial imperfections ( i. e. initial deflections and residual stresses ), boundary conditions and corrosion, fatigue cracking
船體板的屈曲和極限強度取決于很多影響因素，主要有：板的幾何尺寸、材料特性、載荷特徵、初始缺陷（如初始變形和焊接殘余應力） 、邊界條件以及腐蝕的影響、疲勞裂紋等。 -
Basic index and reliability principle of steel structure, and geometric significance are analyzed. the main computation methods, such as two order moment method, separation function and separation item coefficient, linear separation, and central point, check point, monte - carlo are presented. reliability analysis under relative variable, boundary determination ( single and double boundaries ) is analyzed
研究了鋼結構可靠度基本原理、可靠指標的幾何意義，分析了鋼結構可靠度計算的一次二階矩方法、分離函數和分項系數法、線性分離法，以及中心點法、驗算點法、蒙特卡羅（ monte - carlo ）法，提出了變量相關情況下的結構可靠度分析方法、可靠度界限分析方法（單側界限與雙側界限） ，基於極值分佈的可靠度分析，並對鋼結構動力可靠度分析方法進行了初步探討。 -
A new kind of numerical method, the statistical distributed source boundary point method ( sdsbpm ), used to calculate the acoustic radiation problem caused by the random vibrating body is presented ; a test for the effectiveness of the sdsbpm is carried out on the aspects of its calculation precision, adaptation to the geometric shape of vibrating body as well as its ability to overcome the non - uniqueness problem through various examples with different boundary shapes and different boundary value distributions
第四章提出了一種新型的隨機振動聲輻射計算方法?統計分佈源邊界點方法；通過諸多不同邊界曲面和不同邊界量分佈的隨機振動聲輻射算例，從計算精度、對振動體表面幾何形狀的適應性以及克服解的非唯一性等方面，對統計分佈源邊界點方法的有效性進行了考證。 -
The formulation for the error analysis of acoustic radiation problem calculated by the boundary point method ( bpm ) is put forward ; the physical explanation of the boundary point analysis of the acoustic radiation problem is given ; the influence of the particular solution on the calculation stability of the bpm is studied ; the etthanced volume source boundary point method ( evsbpm ) is presented ; a test for the effectiveness of the evsbpm is carried out on the aspects of its calculation precision, calculation speed, calculation stability, adaptation to the geometric shape of vibrating body as well as its ability to overcome the non - uniqueness problem through various examples with different boundary shapes and different boundary value distributions
第三章導出了邊界點方法分析振動聲輻射問題的誤差估計理論公式，揭示了邊界點方法分析振動聲輻射問題的物理本質；研究了特解場的局部特性對邊界點方法的數值穩定性的影響；改進了現有的特解場構造方法，提出了改進體積源邊界點方法；通過諸多不同邊界曲面和不同邊界量分佈的聲輻射算例，從計算精度、計算速度、計算穩定性、對振動體表面幾何形狀的適應性以及克服解的非唯一性等方面，對改進體積源邊界點方法的有效性進行了考證。 -
Geometric boundary condition
幾何邊界條件 -
4 due to the irregular geometric boundary and the complicated internal heat source distribution, the theoretical solution of transient temperature field for specimens with flaws is very difficult
4 、由於含缺陷的構件具有不規則幾何形狀，且具有復雜內熱源，在進行溫度場解析求解過程中遇到很大困難。 -
Some calculation indicated that general - purpose programs can predict load carrying capacity of a ship ' s hull accurately if one take sufficiently into account every load and boundary combination, structure imperfections and initial stresses, together with geometric and material non - linearity. in this thesis, the load carrying capacity of several hull or hull models have been analyzed by using the general - purpose program ansys, and some detailed results are obtained
一些已有的計算分析表明，對于大型通用有限元軟體，只要合理地模擬結構的受載方式，模擬材料的非線性性能，採用合理的單元類型和網格尺度，並綜合考慮極限強度分析的各種因素（如結構的殘余應力、初始變形、材料的非線性性能等） ，通用有限元程序也能獲得精確的船體結構的極限承載能力。
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