THE GENERAL PROPERTIES OF THE SPHERICAL VORTICES（SV）OF n－TH ORDER AND THE CHAOTIC PHENOMENA AND OF THE ORDERED STRUCTURES OF THE SV OF 3RD ORDER

ＴＨＥＧＥＮＥＲＡＬＰＲＯＰＥＲＴＩＥＳＯＦＴＨＥＳＰＨＥＲＩＣＡＬＶＯＲＴＩＣＥＳ（ＳＶ）ＯＦｎ－ＴＨＯＲＤＥＲＡＮＤＴＨＥＣＨＡＯＴＩＣＰＨＥＮＯＭＥＮＡＡＮＤＯＦＴＨＥＯＲＤＥＲＥＤＳＴＲＵＣＴＵＲＥＳＯＦＴＨＥＳＶＯＦ３ＲＤＯＲＤＥＲＳｈｉＣ...     

Solutions to equations of vibrations of spherical and cylindrical shells

ＳＯＬＵＴＩＯＮＳＴＯＥＱＵＡＴＩＯＮＳＯＦＶＩＢＲＡＴＩＯＮＳＯＦＳＰＨＥＲＩＣＡＬＡＮＤＣＹＬＩＮＤＲＩＣＡＬＳＨＥＬＬＳＤｉｎｇＨａｏｄｉａｎｇ（丁浩江）Ｃｈｅｎｗｅｉ－ｑｉｕ（陈伟球）（ＺｈｅｊｉａｎｎＵｎｉｖｅｒｓｉｔｙ．Ｈａｎｇｚｈｏｕ）...     

ELASTICITY SOLUTIONS OF SPHERICALLY ISOTROPIC CONES UNDER CONCENTRATED LOADS AT APEX

ＥＬＡＳＴＩＣＩＴＹＳＯＬＵＴＩＯＮＳＯＦＳＰＨＥＲＩＣＡＬＬＹＩＳＯＴＲＯＰＩＣＣＯＮＥＳＵＮＤＥＲＣＯＮＣＥＮＴＲＡＴＥＤＬＯＡＤＳＡＴＡＰＥＸＤｉｎｇＨａｏｊｉａｎｇ（丁皓江）；ＺｏｕＤａｏｑｉｎ（邹道勤）；ＲｅｎＹｏｎｇｊｉａｎ；（任永坚）（...     

DYNAMIC RESPONSE OF LAMINATED ORTHOTROPIC SPHERICAL SHELLSINCLUDING TRANSVERSE SHEAR DEFORMATION AND ROTATORY INERTIA

（杨宜谦）（马和中）（王俊奎）ＤＹＮＡＭＩＣＲＥＳＰＯＮＳＥＯＦＬＡＭＩＮＡＴＥＤＯＲＴＨＯＴＲＯＰＩＣＳＰＨＥＲＩＣＡＬＳＨＥＬＬＳＩＮＣＬＵＤＩＮＧＴＲＡＮＳＶＥＲＳＥＳＨＥＡＲＤＥＦＯＲＭＡＴＩＯＮＡＮＤＲＯＴＡＴＯＲＹＩＮＥＲＴＩＡ￥Ｙａｎｇ...     

PLASTIC BUCKLING OF STIFFENED TORISPHERICAL SHELL

ＰＬＡＳＴＩＣＢＵＣＫＬＩＮＧＯＦＳＴＩＦＦＥＮＥＤＴＯＲＩＳＰＨＥＲＩＣＡＬＳＨＥＬＬＨａｏＧａｎｇ（郝刚）ＺｅｎｇＧｕａｎｇｗｕ（曾广武）ＨａｏＱｉａｎｇ（郝强）（ＲｅｃｅｉｖｅｄＤｅｃ．３０，１９９４．ＣｏｍｍｕｎｉｃａｔｅｄｂｙＰａｎＬｉｚｈ...     

NON-SYMMETRICAL LARGE DEFORMATION OF A SHALLOW THIN SPHERICAL SHELL

ＮＯＮ－ＳＹＭＭＥＴＲＩＣＡＬＬＡＲＧＥＤＥＦＯＲＭＡＴＩＯＮＯＦＡＳＨＡＬＬＯＷＴＨＩＮＳＰＨＥＲＩＣＡＬＳＨＥＬＬＷａｎｇＸｉｎｚｈｉ（王新志）ＲｅｎＤｏｎｇｙｕｎ（任冬云）ＷａｎｇＬｉｎｘｉａｎｇ（王林祥）ＹｅｈＫａｉｙｕａｎ（叶开沅）（Ｇａｎ...     

AN IMPLICIT ALGORITHM OF THIN LAYER EQUATIONS IN VISCOUS，TRANSONIC，TWO－PHASE NOZZLE FLOW

ＡＮＩＭＰＬＩＣＴＡＬＧＯＲＩＴＨＭＯＦＴＨＩＮＬＡＹＥＲＥＱＵＡＴＩＯＮＳｉＮＶＩＳＣＯＵＳ,ＴＲＡＮＳＯＮＩＣ,ＴＷＯ－ＰＨＡＳＥＮＯＺＺＬＥＦＬＯＷＨｅＨｏｎｇ－ｑｉｎｇ（何洪庆）ＨｏｕＸｉａｏ（侯晓）ＣａｉＴｉ－ｍｉｎ（蔡体敏）ＷｕＸｉｎｇ－...     

Plastic buckling of stiffened torispherical shell

ＰＬＡＳＴＩＣＢＵＣＫＬＩＮＧＯＦＳＴＩＦＦＥＮＥＤＴＯＲＩＳＰＨＥＲＩＣＡＬＳＨＥＬＬＨａｏＧａｎｇ（郝刚）ＺｅｎｇＧｕａｎｇｗｕ（曾广武）ＨａｏＱｉａｎｇ（郝强）（ＲｅｃｅｉｖｅｄＤｅｃ．３０,１９９４：ＣｏｍｍｕｎｉｃａｔｅｄｂｙＰａｎＬｉｚｈ...     

CENTRIFUGAL INERTIA EFFECTS OF THE FLUID FLOW BETWEEN STEPPED SPHERICAL SURFACES

ＣＥＮＴＲＩＦＵＧＡＬＩＮＥＲＴＩＡＥＦＦＥＣＴＳＯＦＴＨＥＦＬＵＩＤＦＬＯＷＢＥＴＷＥＥＮＳＴＥＰＰＥＤＳＰＨＥＲＩＣＡＬＳＵＲＦＡＣＥＳＬｉｕＺｈｉｅｎ－ｂｅｉ（刘震北）（ＨａｒｈｉｎＩｎｓｔｉｔｕｔｅｏｆｔｅｃｈｎｏｌｏｇｙ．Ｈａｒｂｉｎ）（Ｒ...     

The influence of topography on the nonlinear interaction of Rossby waves in the barotropic atmosphere

ＴＨＥＩＮＦＬＵＥＮＣＥＯＦＴＯＰＯＧＲＡＰＨＹＯＮＴＨＥＮＯＮＬＩＮＥＡＲＩＮＴＥＲＡＣＴＩＯＮＯＦＲＯＳＳＢＹＷＡＶＥＳｉＮＴＨＥＢＡＲＯＴＲＯＰＩＣＡＴＭＯＳＰＨＥＲＥＸｉｏｎｇＪｉａｎ－ｇａｎｇ（熊建刚）ＹｉＦａｎ（易帆）ＬｉＪｕｎ（李钧）（...     

注塑模充模过程动态分析

注塑成型是利用型腔模制造理想制品主要的成型加工方式 ,塑料熔体的流动行为将直接影响着最终塑件的质量 ,塑料熔体在三维薄壁型腔内的流动属于带有运动边界的粘性不可压缩流体的流动 ,本文针对塑料注塑成型特点 ,经过量纲分析和引入合理而必要的假设 ,得到了适合于充模分析的数学模型。控制方程的求解主要包括三个阶段 :压力场、温度场和流动前沿位置的确定。数值求解采用有限元法求解压力场、有限差分法求解温度场、并利用控制体积法跟踪熔体前沿 ,实现了充模过程的动态模拟     

注塑模具浇口位置的演化设计方法

首先简要介绍了国内外浇口位置优化设计的研究现状,然后详细阐述了一种基于信息熵的离散变量演化算法的原理和程序实现步骤,将该算法与注塑模流动数值模拟程序相结合进行浇口位置优化设计,并将优化结果与Moldflow推荐的浇口位置进行了分析比较.算例表明,所提出的方法适用于注塑模具浇口位置优化,并且有较好的计算效率和精度.     

Flow analysis of the weld line formation during injection mold filling of thermoplastics

To study the weld line formation of colliding flow fronts the filling of a mold cavity was simulated. The thermo-rheological findings were used to investigate the sources of weld line weakness. In this way critical areas of the interface in regard to the lack of interdiffusion and the inappropriate molecular orientation were found to be placed near the surface of the finished parts. The main source for the weld line weakness seems to be the V-notch that arises due to the poorly bonded region near the surface in combination with the large shrinkage as a result of extremely high molecular orientations induced at the end of the filling. Furthermore, the empirical knowledge was confirmed that weld lines are rather more sensitive to the local flow situation than the global processing conditions. Melt and mold temperatures can be considered to be the most important factors which influence the weld line strength.In part presented at the 6th European Conference on Rheology, Erlangen, 2002     

注射模浇口位置优化的设计空间确定方法

在注射模具的浇口位置优化中，给出确定可行设计空间的一种方法。在总注射速率一定情况下，通过对给定浇口的注射速率进行优化，估计熔体在型腔中流动所受阻力及沆长，确定了单浇口位置可行设计空间。算例分析证明浇口位置可行设计空问确定方法是正确的。     

非对称边界的注塑模充填模拟

研究了注塑充填阶段非对称模温的影响,在整个型腔厚度上分析型腔内的流动,利用混合有限元／有限差分法求解方程,并采用控制体积法跟踪熔体前沿。     

连铸结晶器内部流场及熔渣卷入的数值模拟

针对连铸结晶器内部流场及熔渣卷入过程 ,提出了两方程k -ε湍流模型和充填法数值计算模型 ,并采用硅油 /水模拟体系代替熔渣 /钢液体系 ,进行了模拟试验和数值计算。对充气造成的浸入式水口水流脉动的影响进行分析。计算结果与试验结果符合良好 ,表明本文所采用的数值模拟方法是适用的     

Flow disturbance in polymer melt behind an obstacle

In polymer processing weld-lines occur when a polymer melt is separated and then reunited. The internal structure of a weld-line region is determined by the rheological state of the reunited melt streams. An experimental investigation of the region of interest within the mold is almost impossible. Thus, computer simulation is necessary to examine weld-lines. This paper presents a detailed analysis of the flow behavior at a weld-line interface which was caused by a flow obstacle. The results show a gradual increase of the velocity within a short distance behind the obstacle which coincides with a short weld-line determined by the advancement of the flow fronts obtained from conventional mold filling studies. However, based on the residence time history of the melt there is a weld-line over the full length of the part. Its formation mechanism was additionally described by experimental filling studies by the sandwich injection molding technique. In conclusion, the formation of the weld-line should be determined not only by the flow fronts, but also by the thermo-rheological history of the reunited melt streams. Received: 18 September 1997 Accepted: 3 March 1998     

Numerical simulation of mold filling in foam reaction injection molding

A numerical simulation of reaction injection molding (RIM) of polymeric foam is developed, using a finite volume method (FVM). In this study we predict mold filling with a variable‐density fluid that fills a mold by self‐expansion. We deal with two‐dimensional, isothermal cases. With the assumptions of ideal mixing and rapid bubble nucleation, the foam is modelled as a continuum with a time‐dependent density. The continuum is assumed to be a Newtonian fluid. We develop a pressure‐based FVM for unstructured meshes that includes the SIMPLE algorithm with treatment of fluid compressibility. Cell‐based, co‐located storage is used for all physical variables. To treat the moving interface, an explicit high‐resolution interface capturing method is used. Foam flow in a slit is investigated, and the numerical calculations are in good agreement with an approximate analytic solution. For fountain flow in a rectangular cavity, the shape of the flow front is flatter and the traces of the particles are more complicated for an expanding foam than for a constant‐density fluid. An example of mold filling by an expanding foam demonstrates the geometric flexibility of the method. Copyright © 2003 John Wiley & Sons, Ltd.     

Finite element analysis of flow and heat transfer with moving free surface using fixed grid system

A numerical study was performed on flow and heat transfer involving moving free surfaces that occurs in mold filling processes such as casting and injection molding. In these problems, the calculation domain changes continuously and the numerical treatment of the moving interface tends to cause artificial diffusion. Among the solution algorithms based on the Eulerian method, the volume-of-fluid (VOF) method was used because the method is simple and efficient in handling the complex flow patterns inside the cavity. To solve the transport equation of free surface without artificial smearing of the interface the baby-cell method was employed in the geometric reconstruction of the free surface. Furthermore, a predictor–corrector method was adopted in the time integration of volume-of-fluid (VOF) transport equation to increase the accuracy. The proposed scheme was verified through several benchmark problems. In order to show the capability of the proposed method, several three-dimensional mold filling processes were solved. The current algorithm was applied to the floating body problem. Three-dimensional floating body problems were tested.     

基于ALE方法的3D充填流动模拟

基于任意拉格朗日-欧拉方法发展了三维充填流动的数值模拟方案.该方案采用ALE方法准确地追踪移动自由面的位置并避免了网格扭曲;基于移动最小二乘曲面拟合方法提出了移动自由面上网格节点重定位方法,将充填流动的网格更新过程简化为自由面附近的局部网格重划分过程,并通过分级多面体三角剖分实现,减小了网格划分的计算量,实现了实时网格生成.给出的数值算例结果表明了该数值模型对三维充填流动模拟的有效性.