中英
1
- Abstract : in this paper , a method of identifying physical parameters of surrounding rock of underground caverns in stratified layers is presented , based on expansion of small parameters . a feasible numerical algorithm is proposed to obtain mechanical parameters of surrounding rock bodies by measured displacements
文摘:根據(jù)小參數(shù)展開理論，提出了一種識別層狀地層中地下洞室圍巖物性參數(shù)的方法，為利用測量位移獲得圍巖巖體的力學參數(shù)提供了一種可行的數(shù)值算法。 - This ph . d . thesis - firstly considers the real asymmetric , real symmetric , bisym - metric , and symmetric and skew antisymmetric matrix extension problems constrained by the matrix inverse problem ax = b . and also considers , in the solution set , of the corresponding matrix extension problems , the optimal approximation solution to a given matrix a * . the necessary and sufficient conditions for the existence of and the expressions for the above problems are derived , and the numerical algorithm and examples to solve the problems are also given
首次提出并討論了矩陣反問題ax = b約束下實矩陣、實對稱矩陣、雙對稱矩陣和對稱次反對稱矩陣的擴充問題，討論了在其解集合中與給定矩陣a ~ *的最佳逼近問題，得到了問題的解存在的條件及通式的表示，給出求解問題的數(shù)值算法和數(shù)值例子。 - First , in virtual of identification of flaws is a typical of in - verse problems , proceeding from time - harmonic electromagnetic maxwell ' s equa - tion and helmholtz equation , the uniqueness and existence of direct scattering problems including the numerical algorithms of diverse of boundary conditions is given . second , the uniqueness and existence of inverse scattering problems and the theory of ill - posed integral equation are briefly looked back upon . finally , indicator function method for boundary identification is set up under all kinds of boundary conditions for inverse scattering of homogenous and inhomogenous objects , meanwhile , the proof of possibility for near - field measurements and nu - merical simulation are given
由于缺陷的識別是一類典型的反問題，因而首先從時諧電磁maxwell方程和helmholz方程出發(fā)，具體地闡述了求解正散射問題的有關方法，包括各種(夾雜)邊界條件下的數(shù)值解法，就解的存在性唯一性給予了肯定的回答；隨后對逆散射問題的理論作了簡短的回顧，包括解的唯一性以及非線性不適定積分方程的處理等；然后對均勻介質(zhì)和非均勻介質(zhì)的逆散射問題建立了在各種邊界條件下的邊界識別的指示函數(shù)方法，鑒于近場數(shù)據(jù)獲得的重要性，對近場測試時邊界識別的方法給予了相應的證明，并且實現(xiàn)了數(shù)值模擬。 - The finite element analysis method based on contact problem is a numerical algorithm used for solving contact problem of connection interface , which is developed from the general fem . this method is a combination of elasticity theory and fem , also it is an important aspect of computational structure mechanics
考慮接觸問題的有限元分析法是在傳統(tǒng)的有限元法基礎上發(fā)展起來的處理連接面接觸問題的一種數(shù)值計算方法，它是彈性力學基礎理論與有限元方法相結合的產(chǎn)物，是計算結構力學的一個重要分支。 - The numerical algorithm of solving the adjoint equations for different design cases have been developed by using finite volume methodology which is usually used to solve the flow governed equation . it includes the some important aspects , such as flux formulation , wall and far - field boundary treatment methodology , dissipative term formulation , etc . after the solution of the adjoint equations is obtained , the derivatives of the cost function with respect to all the design variables can be evaluated with the same operation . this can yields a significant saving over the other gradient - based techniques when there are many design variables
( 3 )進行了應用控制理論和三維歐拉方程的機翼氣動反設計研究，以及有升力約束情形下機翼跨音速減阻問題研究，分別推導了相應的共軛方程及邊界條件數(shù)學表達形式，研究與發(fā)展了三維共軛方程的有限體積數(shù)值求解方法，及相應梯度公式的數(shù)值求解方法，通過對計算網(wǎng)格生成、流場計算、共軛方程數(shù)值求解、梯度求解和優(yōu)化算法等多方面的有效結合，成功發(fā)展了三維機翼的氣動反設計和跨音速減阻優(yōu)化設計程序，成功地進行了多個設計算例研究。 - Furthermore , numerical algorithms used to solve the linear system are introduced . next , after briefly discussing several causes of the late - time instability of the tdie solvers , a novel viewpoint about the instability is proposed . the marching - on - in - time algorithm ( mot ) is described and some temporal bases are discussed
其次,在簡要分析了引起時域積分方程( tdie )時間步進算法求解的后時不穩(wěn)定性問題的幾個原因后,指出引起時域積分方程時間步進算法的后時不穩(wěn)定性的主要原因是離散tdie時采用了不精確的數(shù)值計算方法和不恰當?shù)慕啤? - In order to improve the transmission efficiency of the signal and decrease the load of signal acquisition , this thesis reconfigures signals using the computer technology and numerical algorithm , supplies the standard to estimate whether the reconfiguration signals are fuzzy , and confirms better sample frequency . in order to store the feature information and the standard data , this thesis designs a suite of rules to establish the reusable and extensible standard database based on the types of loaders . at last , based on the work above , the system of processing standard information has been developed to analyze and process the signal data and manage the standard database
本文以廣西柳工zl50g型裝載機為對象,在大量分析和實驗的基礎上,選取了故障診斷的敏感信號變量,設計了基于各變量特性的特征值提取算法,提取了信號的時頻特征信息;為了提高信息的傳輸效率和降低信號采集負載,利用計算機技術并結合數(shù)值算法對信號進行重構,并給出重構信號是否失真的判定方法,確定了適用于本課題的較優(yōu)采樣頻率;為存儲裝載機的標準數(shù)據(jù)和特征信息,制定了一套規(guī)則,建立基于機型的可復用、可擴展的標準數(shù)據(jù)庫;最后圍繞以上對數(shù)據(jù)的分析、處理以及對標準數(shù)據(jù)庫的管理,開發(fā)了裝載機標準信息處理系統(tǒng)。
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