Fourth , the iterative guidance ' s feasibility of different terminal conditions is analyzed 4 、分析在不同終端條件下,運載火箭迭代制導方法的可行性。
The current cfd soft wares were introduced . secondly , there were the correlative knowledge about the time averaged reynolds equation , the criterion k ? model , the simple method , the technology of unstructured mesh , the terminal condition and the modeling method 詳細分析與本文研究相關的雷諾時均方程、標準k -模型、 simple計算方法、非結構網(wǎng)格技術、邊界條件以及所用到的幾何建模方法。
A dynamic model and then an optimal control model established , which regards the minimum length of well trajectory as the index of characteristic and meets the terminal conditions . and the necessary condition of optimal solutions for the optimal control system then discussed 建立了非直井跡的動力系統(tǒng)模型,討論了該模型的性質(zhì),以此為基礎,建立了以滿足終端約束與最短并跡長度為性能指標的最優(yōu)控制模型,討論了該模型最優(yōu)解存在的必要條件
Based on the theory of cooperation between foundation and structure , paper uses ansys finite element software forming three - dimensional finite element model of . paper also anglicized element type choose , material attribute choose , loading determination , terminal condition determination , anyslys type determination and solution choose , etc . correcting buildings with the method of drawing out soil was analyzed through ninth aspects listed below 本文借鑒結構設計中的基礎與上部結構共同作用理念,運用ansys有限元分析軟件,在探討了單元類別的選擇、材料屬性選擇、載荷、邊界條件和分析類別的確定、求解器、求解方法與收斂準則的選擇等與有限元建模相關內(nèi)容的基礎上,建立了上部結構和土體共同作用的三維有限元模型。
Third , on the basis hypothesis of mean gravitation , optimal control functional of the launch vehicle equations of state are set up by optimal control theory . the optimal control results of launch vehicle are worked out . this control method of automatic start is inferred , which can satisfy the terminal condition of satellite trajectories 3 、通過引入“平均引力”的簡化假設,利用最優(yōu)控制理論,建立運載火箭的最優(yōu)控制泛函,得出運載火箭的最優(yōu)控制問題的解,推導出了可自動起步,滿足衛(wèi)星軌道終端條件的迭代制導方程。
The basic idea for hierarchy - based method is that creating and maintaining a tree of clusters and sub - clusters according to some kind of criterion to measure the distance of clusters , the procedure will be sloped until some terminal conditions are satisfied . hierarchical clustering method can be further classified into agglomerative and divisive hierarchical clustering , depending on whether the hierarchical decomposition is formed in a bottom - up or top - down fashion . most hierarchical clustering methods can produce the better results when the clusters are compact or spherical in shape . but they do not perform well if the clusters are any shape or there are outliers . a main reason is that the most hierarchical clustering methods employ medoid - based measurement as distance between clusters 基于層次方法的聚類的基本思想足:根據(jù)給定的簇間距離度量準則,構造利維護一棵由簇利子簇形成的聚類樹,直至滿足某個終結條件為止。根據(jù)層次分解是自底向上還是自頂向下形成,層次聚類方法可以分為凝聚的( agglomerative )和分裂的( divisive ) 。人多數(shù)層次聚類算法在緊密簇或球形簇結構下能夠產(chǎn)生較好的聚類效果。
A full mathematical model of optimal flow pattern design withengineering constraints was put forward , based on modern optimal control theory . an optimal flow pattern design was presented for optimizing meridional channel of axial flow turbine . according to integral optimization of turbine stages , a full physical model and mathematical expression were put forward for proposition of optimal flow pattern , including all performance parameters in turbine stages . this problem was further recast into a typical form control to maximize specific performance index such as work or efficiency of stage with given initial state , fixed terminal condition and constraints for part of state terminal variables . the program was also worked out according penalty function method and conjugate gradient method . the optimal distribution of c1ur1 ( r1 ) was obtained according to constraint conditions and maximized objective function 把近代最優(yōu)控制論方法引入軸流透平葉片的設計,在優(yōu)化的軸流透平子午通道內(nèi),建立包括透平級內(nèi)所有性能參量的最優(yōu)流型命題的完整的物理模型及其數(shù)學表達式,并歸化為一個在給定初始狀態(tài)、自變量終端固定、部分狀態(tài)變量終端受有約束的條件下,使級的某一性能指標(如級的功率)達到最優(yōu)的最優(yōu)控制問題,應用“代價函數(shù)法”及“共軛梯度法”編制計算程序,計算得到符合給定約束條件、并使目標函數(shù)取極值的最優(yōu)環(huán)量分布,結果是令人滿意的。