结构流—固冲击屈曲研究进展

本文回顾和综述结构在流－固冲击载荷作用下的动力屈曲问题的研究工作，重点分析、评述流－固冲击屈曲的特征、实验资料及已取得的成果，并展望了该领域今后的研究     

驻波管中的颗粒悬浮现象及其分析

竖直放置的驻波管在共振频率下,位于其管底的微波颗粒群会在一定声压级下产生悬浮,即腾空而起,悬浮在波幅波节平面,本文对该现象进行了实验研究,并在以往声流和声射压理论的基础上对这一现象进行了进一步的理论分析,对该现象的认识将有利于进一步认识强声波对颗粒的作用,在粉尘、环保等领域有很大的应用前景。     

泡沫塑料力学性能研究进展

本文对泡沫塑料力学性能的研究进行了简要综述，重点介绍近期文献和作者在该领域的一些研究工作，及对该领域的研究工作进行展望．     

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简述了多刚体系统接触及碰撞动力学的研究方法，详细回顾了考虑库仑摩擦的多刚 体系统的能量不协调、Painlev\'{e}疑难及碰撞恢复系数等该领域中难点问题的研 究进展，探讨了解决该难点问题的研究思路，指出了未来该领域的研究方向.     

储液罐抗震研究的发展

本文对地上圆筒形平底立式储液罐的抗震研究，特别是提离的研究，进行了较全面的回顾与总结，对该领域中的研究工作和成果作了评述和归类，指出了现存的问题和较快地达到该研究领域前沿的途径。     

湍流扩散多相流

湍流扩散多相流在许多工程和环境科学实际应用中十分常见.流体相中的湍流和扩散相的随机本质使得湍流扩散多相流中遇到的问题远比单一流体中遇到的湍流现象复杂得多.首先评述了湍流扩散多相流研究中实验技术和数值计算方面的现状、各自的优点与局限性,以及该领域研究中未来面临的挑战.主要关注湍流扩散多相流研究中以下3方面重点内容:颗粒、液滴和气泡的选择性聚积;湍流对流体相和扩散相耦合作用的影响以及颗粒物和气泡的存在对流体相中湍流的调节机制.     

ALE有限元方法研究及应用

将ALE（Arbitrary Lagrangian-Eulerian)描述引入到有限元方法中， 从而使有限元方法在解决大范围自由移动边界问题，特别是液体大幅晃动、流－固耦合、加工成型、接触、大变形等问题时获得极大成功。本文综述了ALE有限元方法的研究现状以及在不同领域的应用，并对 今后的研究及应用做了展望。     

柔性多体系统动力学研究动态

本文主要对国外在柔性多体系统动力学领域中进行的研究进行了简要综述和介绍，同时也介绍了一些国内的情况，并提出了该领域中存在的问题。     

复杂激励下平置板式浮筏功率流传递特性研究

针对隔振理论研究领域中舰船的振动和噪声控制问题，建立六维^[1、2]平置板式弹性浮筏的多机组隔振理论分析计算模型，导出了弹性浮筏传递功率流的表达式，从振动能量传输的角度来评价浮筏系统隔振效果，绘制了功率谱曲线，揭示机组的布置，筏架刚度等结构参数对功率流传递的影响，给出了浮筏设计中结构参数选择的一般准则。     

气液两相瞬变流的流固耦合模型研究

传统的气液两相流瞬态分析和管道动力响应计算是分开的，存在一定的缺陷．针对石油工业中常见的多相混输问题，介绍了常见的气液两相流瞬态模型和流固之间存在的耦合机理，在不作薄壁管假设的前提下推导出了气液两相瞬变流的流固耦合模型．与现有相似模型的对比分析表明，这一模型比较全面地考虑了流体和管道的特性以及不同的耦合形式，可以适应实验和／或仿真研究的需要．     

Experiment and modelling of birefringent flows using commercial CFD code

It is well-known that certain fluids are birefringent and when flows are viewed in polarised light interference fringes are observed. The fringes are caused by a phase shift in the light passing through the fluid and are proportional to the integral of the maximum shear strains in the fluid. In order to understand what is happening within the three dimensional flow and overcome the difficulties due to this integration, additional computational or experimental information is needed.

In this work, a commercially available computer code (Fluent) is used for the first time to model the flows. The flow data are then exported to a spreadsheet where the shear rates are integrated across the field and then banded for graphical output. The results from this are then compared to results generated from birefringent flow experiments and the agreement is found to be good since the modelled fringes show the same patterns as those in the experiment. This novel use of computational and experimental techniques together will allow quantitative analysis of three-dimensional flows in the future.

Currently, there are still a lot of empirical variables involved in fitting the computational fringes to the experiment, but the results of this preliminary study show that this is a promising approach to this type of problem.     

柔性结构控制中的溢出问题的研究

综述了近年来柔性结构控制中的溢出问题的研究．首先详细分析溢出产生的机理及其影响，进而总结出影响溢出现象产生的主要因素，然后围绕这几个方面分类评述了溢出抑制的各种方法，最后讨论了这一研究方向的发展趋势     

尖端具有吸附性接触的界面裂纹对瞬态弹性波作用下的动态响应

建立并研究一类接触型界面裂纹模型对瞬态弹性波作用下的动态响应问题。文中利用积分变换和积分方程法推导了确定这类问题的奇异积分方程组。采用围道积分技术和切比雪夫多项式展开技术，得到了待定系数的非线性代数方程组。最后给出了裂纹尖端接触区大小和接触应力随时间变化的数值结果，揭示了这种接触裂纹的动力学特性及物理上的合理性。     

A Roe scheme for a compressible six‐equation two‐fluid model

We derive a partially analytical Roe scheme with wave limiters for the compressible six‐equation two‐fluid model. Specifically, we derive the Roe averages for the relevant variables. First, the fluxes are split into convective and pressure parts. Then, independent Roe conditions are stated for these two parts. These conditions are successively reduced while defining acceptable Roe averages. For the convective part, all the averages are analytical. For the pressure part, most of the averages are analytical, whereas the remaining averages are dependent on the thermodynamic equation of state. This gives a large flexibility to the scheme with respect to the choice of equation of state. Furthermore, this model contains nonconservative terms. They are a challenge to handle right, and it is not the object of this paper to discuss this issue. However, the Roe averages presented in this paper are fully independent from how those terms are handled, which makes this framework compatible with any treatment of nonconservative terms. Finally, we point out that the eigenspace of this model may collapse, making the Roe scheme inapplicable. This is called resonance. We propose a fix to handle this particular case. Numerical tests show that the scheme performs well. Copyright © 2012 John Wiley & Sons, Ltd.     

弹性连杆机构的非线性动力学特性分析

本文应用动力学虚功原理建立了计入几何非线性时弹性连杆机构一般形式的动力学有限元模型，该模型是具有周期性的时变非线性微分方程，针对方程的这一特点，文中给出了一种高效的闭式迭代求解方法。最后通过实例研究了几何非线性对弹性连杆机构动特性的影响，并通过实验研究验证了本文建模及求解方法的正确性。本文的研究结果对弹性机构的动态设计有指导意义。     

New results for isotropic point scatterers: Foldy revisited

Since 1945, Foldy’s method has been used to predict velocity and attenuation for various types of scatterers. In this paper, it is shown that Foldy’s method also yields predictions of reflection and transmission of scalar waves by a random distribution of point or line scatterers contained in a slab. Results are given in two and three dimensions, and for normal and oblique incidences. Formulae are also obtained for the reflection and transmission of longitudinal waves by point or line scatterers distributed in an elastic (non-viscous) fluid. Energy equations are derived, and expressions are obtained for the energy dissipated in the slab on average over one period. Curves for the reflection and transmission coefficients are presented in the case of solid cylindrical bars immersed in a fluid. The results obtained in this paper are expected to be valid for a low density of scatterers. Potential applications of this work occur in ultrasonic evaluation of materials, seismic exploration and medical ultrasonics, where reflected (or backscattered) data are used to construct maps or images of the materials (metals, composites, earth subsurface, tissue). The formulae of this work are expected to provide useful tools for better and more efficient mapping or imaging.     

Scattering of harmonic elastic waves by a plane interface crack with linear adhesive tips in a layered half space

In this paper, the scattering of elastic waves by an interface crack with linear adhesive tips in a layered half space is considered. By use of integral transform and integral equation methods, the singular integral equations of this problem are derived, which are transformed into a set of algebraic equations by means of contour integration and Chebyshev polynomials expanding technique. The numerical results of the adhesive region and stress amplitudes are given in this paper.     

Maxwell粘弹性球体的湿应力

谷物烘干时，谷粒内部的热－湿应力太大，可能使谷粒出现裂纹．基于这一实际问题，本文研究了当初始湿度和平衡湿度给定时，Ｍａｘｗｅｌ粘弹性圆球内的湿应力分布，及其随时间的变化情况．     

尖端具有线性粘着力作用的加层空间的界面裂纹对稳态弹性波的散射

本文研究一类粘着型界面裂纹的弹性波散射问题．文中利用积分变换和积分方程方法推导了确定这类问题的奇异积分方程组．采用围道积分技术和切比雪夫多项式展开技术，得到了待定系数的非线性代数方程组．最后本文给出裂纹尖端粘着区的大小和界面应力的数值结果．     

事件空间中非完整有势系统的参数方程

本文首先在事件空间中建立非完整有势系统的广义方程,然后给出此空间中表示Nielsen算子和Euler算子之间关系的两个定理,最后由这些定理得到广义Nielsen方程。