Fourth , the iterative guidance ' s feasibility of different terminal conditions is analyzed 4 、分析在不同終端條件下,運(yùn)載火箭迭代制導(dǎo)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(xì)分析與本文研究相關(guān)的雷諾時(shí)均方程、標(biāo)準(zhǔn)k -模型、 simple計(jì)算方法、非結(jié)構(gòu)網(wǎng)格技術(shù)、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(dòng)力系統(tǒng)模型,討論了該模型的性質(zhì),以此為基礎(chǔ),建立了以滿足終端約束與最短并跡長(zhǎng)度為性能指標(biāo)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(jié)構(gòu)設(shè)計(jì)中的基礎(chǔ)與上部結(jié)構(gòu)共同作用理念,運(yùn)用ansys有限元分析軟件,在探討了單元類(lèi)別的選擇、材料屬性選擇、載荷、邊界條件和分析類(lèi)別的確定、求解器、求解方法與收斂準(zhǔn)則的選擇等與有限元建模相關(guān)內(nèi)容的基礎(chǔ)上,建立了上部結(jié)構(gòu)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(guò)引入“平均引力”的簡(jiǎn)化假設(shè),利用最優(yōu)控制理論,建立運(yùn)載火箭的最優(yōu)控制泛函,得出運(yùn)載火箭的最優(yōu)控制問(wèn)題的解,推導(dǎo)出了可自動(dòng)起步,滿足衛(wèi)星軌道終端條件的迭代制導(dǎo)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(lèi)的基本思想足:根據(jù)給定的簇間距離度量準(zhǔn)則,構(gòu)造利維護(hù)一棵由簇利子簇形成的聚類(lèi)樹(shù),直至滿足某個(gè)終結(jié)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(lèi)方法可以分為凝聚的( agglomerative )和分裂的( divisive ) 。人多數(shù)層次聚類(lèi)算法在緊密簇或球形簇結(jié)構(gòu)下能夠產(chǎn)生較好的聚類(lèi)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(shè)計(jì),在優(yōu)化的軸流透平子午通道內(nèi),建立包括透平級(jí)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(xué)表達(dá)式,并歸化為一個(gè)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(jí)的某一性能指標(biāo)(如級(jí)的功率)達(dá)到最優(yōu)的最優(yōu)控制問(wèn)題,應(yīng)用“代價(jià)函數(shù)法”及“共軛梯度法”編制計(jì)算程序,計(jì)算得到符合給定約束條件、并使目標(biāo)函數(shù)取極值的最優(yōu)環(huán)量分布,結(jié)果是令人滿意的。