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Chapter 5 to text the numerical method put forward carries on the numerical experiment, special two fractional differential equation problem within biologies carries on the test, the number result enunciation method is valid.

第五章对文中所提出的数值方法进行了数值试验,特别就计算生物学中的两个分数阶微分方程问题进行测试,数值结果表明方法是有效的。

Then, under the consideration of mixed boundary value condition, a pair of dual integral equations for the rocking vibrations of a disk on saturated grounds are obtained, which can be reduced to a Fredholm integral equation of the second kind and solved by numerical procedures. Consequently, the dynamic compliance coefficient is evaluated and numerical results are presented to portray the influence of poroelastic effects on the dynamic interaction problem.

对于刚性圆板,作者首先采用Hankel变换对波动方程进行求解,得到了该控制方程在Hankel变换域内的通解,然后由混合边值条件建立了饱和地基上刚性基础摇摆振动的对偶积分方程,并将其化为第二类Fredholm积分方程,用数值方法计算了不同频率下基础的动力柔度系数,从而考察孔隙水的存在对基础摇摆振动特性的影响。

Using Biot's 2D elastodynamic theory solves the saturated soil equation. The Fredholm integral equation of the second kind can be built by using the fundamental solution of circular load, the compatibility condition and superposition method. The Fredholm integral equation of the second kind of pile groups can be solved by using numerical method. The numerical solutions of pile groups axial forces, pore pressures under vertical harmonic loading and shear forces, moments and pore pressures under horizontal harmonic loading can be obtained.

采用Biot提出的三维波动原理,利用圆形简谐载荷作用下的Biot固结方程的基本解和桩土之间的变形协调条件,并采用叠加原理得到饱和土中群桩的第二类Fredholm积分方程,应用数值法求解群桩的第二类Fredholm积分方程,得到在垂直简谐载荷作用下群桩的轴力、孔压随桩身变化的数值结果以及在水平简谐载荷作用下群桩的剪力、弯矩和孔压随桩身变化的数值结果。

Based on rubbing model of a two-disk rotor-stator system with consideration of both rotor and stator dynamics,a numerical integration program is applied to numerical simulation and analysis of the nonlinear dynamics of this system,such as bifurcation,Poincare section map,trajectory of axes,phase trajectory,frequency spectrum diagram and time response.

基于一新型径向-轴向复合碰摩双盘转子-机匣力学模型,利用数值积分和Poincare映射方法,对转子-机匣系统由于径向-轴向碰摩故障导致的非线性动力学行为进行了数值仿真研究,给出了系统响应随转速和偏心量变化的分岔图和一些典型的Poincare截面图、相轨图、轴心轨迹、幅值谱图和时域响应等。

The formula of numerical computing is presented with discretion for Fresnel diffraction and phase numerical reconstruction of wave front.

从光的菲涅耳衍射、波前相位重构入手,对连续信号进行了离散化处理,给出了数值计算公式。

The evolution of frontal rainbands happening during the frontogenesis induced by deformation field is investigated through the numerical cloud model. Besides, in order to get insight from the results of numerical simulations, the semigeostrophic frontogenesis model is used to investigate the effect of diabatic heating on the frontogenesis and the analytical method of WKBJ is used to study the influence of large-scale deformation field and frontal circulation on the development of symmetric disturbance happened in the frontal zone.

为了加深对数值模拟结果的理解,还利用半地转模式对非绝热加热影响锋生的过程进行了讨论,通过WKBJ方法讨论了变形场锋生条件下对称扰动的发展,从中可以了解大尺度变形场和锋生环流对中尺度扰动的作用,这方面的工作可以对前面非静力数值模拟结果的理解提供帮助。

The frontogenesis process involves in the interactions among the systems of multiple scales. Since the hardness of the nonlinear problem, it is difficult to study frontogenesis analytically. The introduction of the effects of orography, friction and diabatic processes generally makes impossible the analytical resolution of the problem and leads to the use of numerical models. Primitive equations are numerical integrated together with a detailed description of physical processes. The circulation obtained is then used to diagnose and test theoretical mechanisms. It should be noted, however, that a fully description of frontogenesis in explicitly resolving the of large-, meso- and micro-scale flow in the same framework is not yet possible because of the excessive computer capacity and the time required. In order to deal with the problem, the action of large-scale background has been simplified and taken into consideration through the addition of the forcing into the nonhydrostatic cloud model.

大气锋生是一种多尺度相互作用的过程,理论研究遇到非线性的困难,在考虑地形、摩擦、非绝热等物理过程之后,解析研究更加棘手,通过数值模拟搞清其中的物理机制是重要的研究手段,但是把大、中、小尺度甚至微尺度的系统及其相互作用过程在一个模式里同时模拟好仍然受计算机速度和容量的限制,本论文在非静力云模式中通过强迫方式加入大尺度变形场的作用,在考虑到大尺度背景作用的同时,可以充分利用云模式所提供的丰富物理过程、非静力和高分辨率特点,开展一些过去较难进行的研究工作。

The model of multi-layers dense media is developed for numerical simulation of polarized brightness temperature from layering lunar soil and rock. Numerical simulations show the functional dependence of relevant physical parameters.

提出模拟的亮温和多层月壤月岩的多层密集粒子介质辐射传输模型为理论观测,反演月球表面参数,讨论了月壤厚度等参数反演可予以实施的方法。

Concretely, firstly with Timoshenko beams, the fundamental formulae of solutions of dynamical equations, boundary conditions and initial conditions have been transformed by Laplace transformation. Secondly, in the Laplace regions , we gain the analytical solutions of impact forces at the impact contact points, shear and maximum inverse stress of beams. Then, by using Durbin numerical inverse method, we gain the numerical solutions of Timoshenko beams under various restriction conditions. Moreover, the graphs about impact forces at the impact contact points, shear and maximum inverse stress of beams can be obtained too.

把Timoshenko梁力学模型动力学方程的基本解形式、边界条件以及初始条件进行Laplace变换,在Laplace区域得到了冲击接触处的冲击力、整个梁的最大弯曲应力和剪力的解析解,然后利用Durbin数值反演的方法得到了各种约束条件下的Timoshenko梁模型时间-空间的数值解,得到了冲击接触处的冲击力、梁各处的最大弯曲应力和剪力的曲线图。

A third order ENO finite volume method for hyperbolic conservation laws on unstructured triangular mesh is introduced.In order to obtain the third order accuracy on spatial discretization,a weighted quadratic interpolation is constructed on every triangular mesh.Two point Gauss quadrature formula is also used on each edge of every triangular mesh and the third order TVD Runge-Kutta method is used for time discretization.The numerical order of convergence and the numerical result of a mesh 3 wind tunnel with one step are given.

摘 要 基于双曲型守恒律方程,对非结构三角形网格给出了一种ENO(Essentially Nonoscillatory Scheme)型有限体积格式,方法的主要思想是先对每一个三角形单元构造一个加权的二次插值多项式,而在计算交界面的流通量时采用了两点高斯积分公式以保证格式的整体精度,时间离散采用三阶TVD Runge-Kutta方法。

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