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    The Research of N-S Equations' Solution Using Hybrid Grids and Multi-grid Methods and It's Applications
    基于混合网格和多重网格上的N-S方程求解及应用研究
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    Study of the Numerical Methods for Satellite Dynamics Equations and Application of Satellite Laser Ranging Technique to Precise Orbit Determination
    人卫运动方程的数值解法及激光测距技术在精密定轨中的应用研究
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    Research on Numerical Simulation of N-S Equations for the Three-Dimensional Flow Field in Transonic Compressor Rotor
    跨声速压气机转子三维流场Navier-Stokes方程数值模拟
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    Mathematical Methods for Incompressible Hydrodynamic and Magneto-hydrodynamic Equations
    不可压流体动力学方程的数学方法
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    Numerical Solution of External Problems of Unsteady Whole Navier--Stokes Equations and Energy Transport Equation by Integral--Differential Method
    用积分—微分法数值求解非定常完全Navier—Stokes方程及能量方程的外部问题
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    FINITE DIFFERENCE METHOD FOR THE BOUNDARY LAYER CALCULATION OF THE CASCADE FLOW WITH S_1 STREAM SURFACE
    S_1流面叶栅附面层微分方程数值解(一)
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    A FINITE ELEMENT SCHEME FOR SOLVING CONVECTION-DIFFUSION EQUATIONS--UPWIND FACTOR METHOD
    解对流扩散方程的有限元逆风因子法
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    Euler Solution for Wing-body Combination at Supersonic Speeds
    超声速翼-身组合体Euler方程数值解
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    Finite Element Method in Frequency Domain for Nonlinear Transient Field Problems
    计算非线性时变涡流场的有限元方程频域算洁
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    Establishment of Vibration Equaation of Pipe Conveying Fluid Submerged in Water
    浸入水中输运流体管道振动微分方程的建立
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  equations
The list consists of many series defined by simple equations, and of several exceptional superalgebras, among themE(3, 6).
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
We study the existence and regularity of compactly supported solutions φ = (φv)v=0/r-1 of vector refinement equations.
      
They are of particular importance in solving differential and integral equations.
      
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The analysis of the pilot-induced oscillation is carried out in general by usingthe simulated methods or flying tests. For the need of the design calculations, however, the writer through consulting the related references provides twotheoretical methods, i.e. the frequency response and root-locus methods.At first, the equation of the airplane longitudinal motion, the equation of the control system motion with full-power or no-power, and the related transfer functions are given in this paper.And then, based on...

The analysis of the pilot-induced oscillation is carried out in general by usingthe simulated methods or flying tests. For the need of the design calculations, however, the writer through consulting the related references provides twotheoretical methods, i.e. the frequency response and root-locus methods.At first, the equation of the airplane longitudinal motion, the equation of the control system motion with full-power or no-power, and the related transfer functions are given in this paper.And then, based on the closed-lrop dynamic models of the combination of the airplane and control systems, the frequency response of the elevator deflection to stick force input is calculated and the root-locus is plotted. Thus, the tendency of the pilot-induced oscillation may be analylized.In addition, some simplified criterions of the longitudinal pilot-induced oscillation are presented. Some primary influence factors, especially the effect of bobweight in control systems are discussed.

驾驶员诱发振荡问题的分析,一般通过模拟试验或飞行试验进行。但为了设计计算的需要,本文参考有关资料,提出两种理论分析方法,即频率法和根轨迹法。 文中首先给出飞机的纵向运动方程、助力及非助力操纵系统方程以及有关传递函数,然后根据飞机与操纵系统组合的闭环动力学模型,计算舵偏角对杆力输入的频率反应或绘制根轨迹曲线,从而可以分析飞机的诱发振荡趋势。 此外,还介绍了几种纵向驾驶员诱发振荡的简化判据。并对主要影响因素,特别是对操纵系统配重的影响进行了讨论。

This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil...

This paper is mainly devoted to: (1) the description of the special features of the equations of pressure, equations of flow and resistance and the calculations of the performances of the journal bearings under turbulent conditions; (2) the comparison between the performances of the elliptic bearings under turbulent conditions and those under laminar conditions. The comparison shows that with the same eccentricity the load capacities for the turbulent operation are larger, the stiffness and damping of the oil film are greater and stability conditions are basically the same. With the same coefficients of load capacities, the oil flow for the turbulent operation will be a little greater or smaller, the power losses and temperature rises will be about thrice larger and the regions of stability will be slightly narrower. Thus the data for laminar operation may be used to estimate the stability performances for turbulent operation in case of lack of the turbulent data; (3) a comparison among several theories of the turbulent lubrication developed abroad more recently by Constantinescu, Ng and Pan, Aoki and Harada and Hirs. These theories have been examined and analysed. The result shows that the theory put forward by Aoki and Harada is the best of all. On the other hand the Hirs Theory is obviously unreasonable when it is used with large eccentricities; (4) suggestions and recommendations made to the manufacturer concerned: recommending the length diameter ratio should be chosen as 0.75, the elliptic ratios should be chosen between 0.5 and 2/3 and some kinds of grooves for oil outflow should be made in the region of the oil film rupture to reduce power losses; (5) a preliminary disoussion on the rational criteria for determining the flow regime in the oil film of an elliptio bearing. The materials in the paper may prove helpful in designing, calculating and experimenting with bearings for turbulent operation.

本文主要介绍:(1)紊流工况下椭圆轴承的方程(雷诺、流量和阻力方程),计算框图以及计算中的几点考虑:紊流系数的选取;油膜破裂区阻力的考虑;紊流系数中的局部雷诺数R_h值;紊流流道中出现层流段的考虑等。(2)紊流工况和层流工况轴承性能差异分析。(3)紊流工况椭圆轴承的性能曲线和分析。(4)对某机组用椭圆轴承结构、参数的建议。

The results of our experiments on the heat transfer coefficient for the condensation of Freon 12 and 113 on four kinds of low-finned tube are quite different from those calculated by the current formula suggested by Katz et al. both quantitatively and qualitatively. In this paper an analysis of the mechanism of condensation about the effects of surface tension is described and two dimensionless quantities β_σ and β_c are proposed to characerize these effeets. Besides, another configuration size factor β_v is...

The results of our experiments on the heat transfer coefficient for the condensation of Freon 12 and 113 on four kinds of low-finned tube are quite different from those calculated by the current formula suggested by Katz et al. both quantitatively and qualitatively. In this paper an analysis of the mechanism of condensation about the effects of surface tension is described and two dimensionless quantities β_σ and β_c are proposed to characerize these effeets. Besides, another configuration size factor β_v is also considered. Based on our experiment and the theory of similarity, a new criterial equation of heat transfer for the condensation of Freon vapors on a low-finned horizontal tube is recommended as follows

R12和R113在四种国内常用的低肋管外冷凝放热的试验表明,目前所采用的计算α_0肋的公式,无论在定性或定量方面都与实验结果有很大出入。本文对其冷凝机理——表面张力作用作了分析,提出用两个无因次量β_σ和β_c予以表征。此外,考虑一个结构因子β_v。根据试验结果和相似理论,整理出氟里昂蒸汽在低肋管外冷凝放热的新的准则方程为■

 
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