NONLINEAR ANALYSIS OF LAMINATED ANGLE-PLY PLATE USING A HIGHER-ORDER SHEAR DEFORMATION THEORY

A higher-order shear deformation theory is used to analyse nonlinear bending of symmetrically laminated angle-ply rectangular plates. The nonlinear governing differential equations are solved here by using perturbation method. Numerical rerults are presented graphically for vairous parameters of laminated plate. The present solutions are compared with those obtained using the classical plate theory. A lot of significient conclusions are obtained.     

SOME PROBLEMS BY USE OF BOUNDARY POINT ELEMENT IN BOUNDARY ELEMENT METHOD

Using boundary point element is one of the treatmentsof corner node problem.This paper further discusses some problems byuse of point element.They mainly include the calculation of stresses atpoint elements,the cause and treatment of singularity in boundary usingequations when point elements are used.An example is given.Correctlyboundary point element has certain practical significance for moreobjective simulation of the actual situation of quantities and improvesaccuracy of results.     

ANALYSIS FOR VIBRATION OF ARCHES BY TRANSFER MATRIX METHOD

This paper presents a transfer matrix method for analysing dynamiccharacteristics of arches.The calculation models are the broken-line rigidframes with a series of mass points,which are simplified from the criginalstructures.The geometric stiffness and the axial deformation of arch are consi-dered in formulating its vibration transfer equation.Through application ofthe method,the vibration modes and the relative values of internal forces canbe obtained simultaneously as soon as the vibration frequencies of arch areknown.The simple and direct method developed may be easily calculated withmicrocomputer,and it has extensive usage with high precision.     

CALCULATION OF THIN PLATES BENDING EEFORMATION AND CRITICAL PRESSURE BY THE TCHEBYCHEV''S POLYNOMIALS

In this paper trial functions of the second Tchebychev's polynomials is used with Cantorovich variational method in energy functional of thin plate. Bending deformaion of rectangle plate under even loads or concentrate force with several bearing and critical pressure in buckling is resolved. Though the first similar is used but calculations indicate that this method is simple and exact in engineering.     

THE SPLINE BOUNDARY ELEMENT METHOD FOR CALCULATION OF ELECTROMAGNETIC FIELD PROBLEMS

The spline boundary element method is presented for electromagnetic field problems. Based on B-spline function interpolation, the formulation of calculation of two dimensional statical electromagnetic field problems is obtained. Boundary corner and singular integration problems are efficiently handled. Furthermore,the Method is used for solving two calculation examples.     

TO SOLVE PROBLEMS OF STRUCTURAL RELIABILITY BY MONTE CARLO METHOD

This paper uses simple and clear mathematical proving to expound the fundamental principle,usage and prospect of Monte Carlo method. This paper also gives an example which explains how Monte Carlo method is used for analysing structural reliabilty of engineering.     

AN ENTHALPY METHOD OF SOLVING PHASE CHANGE PROBLEMS BY COUPLING THE ENTHALPY AND THE MOVING BOUNDARY

A numerical enthalpy method is proposed for solving the multi-dimensional phase change problem by coupling the enthalpy and the moving boundary. Its basic feature is to sepasate appearent and latent heat terms by transforming the standard enthalpy relation and to couple them into the latent heat term by introducing the idea of phase change rate between the axes and simultaneously to correct the heat flux of the inflowing/outflowing phase change control volume element , so that the accuracy of numerical solution is improved and the moving boundary can be accurately followed.     

THE METHOD OF FORMING HOURLY OUTDOOR TEMPERATURE BY SPLINE FUNCTIONS AND ANAYSIS OF ERRORS

It is necessary to input the hourly meteorological data in order to analyze building annual energy consumption and to simulate dynamically air-conditioning systems.The hourly outdoor temperature constituted by cubic splineinterpolation when forming meteorological data is used for building energy anal-ysis.This paper analyzes the theory of spline function interpolation errors affe-cted by boundary conditions and introduces the methods to decrease interpolationerror.     

ANALYSIS AND PROGRAM FOR CHUNK AND STIFFENED SHELL STRUCTURES BY FINITE ELEMENT METHOD

The improved isoparametric shell element and the biased Isoparametric beam element are applied to the composite structures which consist of cubic chunks and stiffened shells. A flexible and practical method is found for this type of composite structure. The example shows that the theory and program are efficient.     

直剪法用于糙米内摩擦角的测定与研究

利用土工合成材料综合测定仪（直剪仪）,以水分含量14.57%的糙米为样品,测定了在不同的法向压应力、不同的剪切速率下糙米的剪切应力并计算出内摩擦角。实验结果表明：糙米的剪切应力随着法向压应力（25kPa～100kPa）的增大而增大;剪切速率（1.33mm/min～2.67mm/min）较低时糙米的内摩擦角随着法向压应力的增大而减小;随着剪切速率（1.33mm/min～5.20mm/min）的增大,糙米的内摩擦角减小。     

凯氏定氮法测定大米中蛋白质的不确定度分析

采用GB/T5009.5-2003第一法,凯氏定氮法测定大米中蛋白质的含量,其测量不确定度来源于样品称量、消化、定容、移取消化液、蒸馏及滴定等过程。通过对各个不确定度分量的计算合成,找出影响测量不确定度的因素,并对各个不确定度分量进行评估,最终分析出样品大米中蛋白质的标准不确定度及扩展不确定度并描述了影响大米蛋白质测定结果各分量对其不确定度的相对贡献。     

APPLICATION OF DECOMPOSITION COORDINATION METHOD OF LARGE - SCALE SYSTEMS AND METHOD OF NONLINEAR PROGRAMMING TO ECONOMIC SCHEDULING OF POWER SYSTEM

In this paper,we discuss a mathematical mode) for optimization of active power dispatch of large-scale hydro-thermal power systems with cascaded hydropower stations. The following factors are taken into account: the variation of the head in the hydropower stations, water transport delay between cascaded stations etc. Using the decomposition-coordination method of large scale systems, we obtain a three-layer-hierarchical coordination system and a three-layer-hierarchical computational structure. We also discuss the computational methods which are used by each hierarchy. We have taken a test computation and analysing the result of an actual hydrothermal power system. The computational results show that it may obtain a satisfactory economic benefit. The paper provides some research work on the economic scheduling of hydrothermal power systems by the decomposition-coordination method of large-scale systems,multiplier method and a new variable metric method.     

RESEARCH AND ANALYSIS FOR STRENGTH BEHAVIOR PARAMETERS OF HEAVY PLATES

This paper analyses test data about the strength behavior of heavy plates collected recently. In this paper,their behavior parameters are obtained by the data. The statistical parameters not only serve as a supplement to the concerned standard but as scientific basis for further analysis.     

PAYING ATTENTION TO USE SIMPLEX METHOD FOR OPTIMAL MULTIPARAMETER IN THE DESIGN OF CONTROL SYSTEM

In the design of control system using simplex method for optimal multi-parameter,if the difference in number between the greatest and the smallestparameters is very great,the optimization process converges very slowly.Evenoptimal parameters can't be found at all.This paper studies the problem,analyses its cause and poses a resolution means.A testing example shows thatthis means can solve the above problem well.     

A CONSTITUTIVE FUNCTION FOR A NONLINEAR ANALYSIS OF STRUCTURES OF LINEAR ELEMENTS

In this paper, a constitutive function in form of integration is presented for a nonlinear analysis of structures of linear elements. With applications of a constitutive function, the truss and frame elements material nonlinear stiffness equations are derived. The results shows the convenience in numerical analysis and the ability to solve some difficult problems in tn the structural behavior study both in loading and unloading process by use of the presented constitutive function.     

A NEW METHOD BY USE OF MASS AND ACCELARATION PARAMETERS FOR BALANCING THE SHAKING MOMENT OF ARTICULATED MULTI-BAR LINKAGES

In this paper,a new method with general purpose ispresented for balancing the shaking moment of articulated multi-barlinkage.The concept of this method is clear.The moment equation oflinkages is easy to establish and solve.Furthermore its pattern structuremakes it convenient to be programmed.     

THE SECOND ORDER PERTURBATION ANALYSIS OF FREQUENCY RESPONSE FUNCTION OF STRUCTURE WITH NON-PROPORTIONAL CHANGEABLE; DAMPING

A simplified procedure is presented for the determintion of rates of change of frequency response function matrix of system for the non-proportional changeable damping ,by means of the second order perturbation technique in conjunction with complex modal analysis. Consequently, when excitation information in frequency domain is known,the sensitivity of the response power spectra and the response time history can be obtained.     

A BOUNDARY ELEMENT METHOD FOR THE NEUMANN PROBLEM OF HELMHOLTZ EQUATION BY USE OF A DOUBLE LAYER POTENTIAL IN R~3

This paper presents a new numerical solution for Neumann problem of Helmholtz equation in R~3. The expression of the solution for this problem is obtained by use of a double layer potential and it leads to a Fredholm boundary integral equation of the first kind. Then, the existence and unicity of the integral equation which is equivalent to the boundary value problem are obtained in a suitable Sobolev space. Finally, a variational form which is equivalent to the integral equation is applied to the construction of a finite element method and the error estimate is given.     

SBVERAL PROBLEMS ON BACKANALYSIS OF LANDSLIDE WITH A VARIATIONAL METHOD

The shape,position and stress distribution on the sliding surface can be rationallydetermined by a variational method.And the method satisfies the equilibrium,yield condition and thetransversal conditions for the unknown position to determine the critieal height of a slope when theslope angles and the material parameter C and are known.This paper corrects some ertors existingin the current literature and presents two curves to facilitate deterimination of the critical height andthe cracking position appearing on the top surface of the slope.These curves are particallarly suitedto backanalysis of landslide when the cracking position,the originally slope angle and the failuredslope height are known or can be estimated.Finally,calculated examples are cornpared with currentliterature.