大规格圆钢质量分析和控制

针对湘钢棒材厂生产大规格圆钢出现的表面质量问题，重点介绍了在成品轧机后采用U形辊道和立活套替换棍道；冷床输入辊道采用镶WT合金套；增设高压水除鳞装置；中间轧件尺寸精度控制等措施，成功的解决了大规格圆钢表面擦伤、“麻面”、尺寸超差等表面质量问题，产品质量显著提高。     

Solution of large deformation contact problems with friction between Blatz-Ko hyperelastic bodies

The present paper is devoted to the analysis of the contact problems with Coulomb friction and large deformation between two hyperelastic bodies. One approach to separate the material nonlinearity and contact nonlinearity is presented. The total Lagrangian formulation is adopted to describe the geometrically nonlinear behavior. Nondifferentiable contact potentials are regularized by means of the augmented Lagrangian method. Numerical examples are carried out in two cases: rigid-deformable contact and deformable-deformable contact with large slips. The numerical results prove that the proposed approach is robust and efficient concerning numerical stability.     

结构-波浪-海床耦合系统中大圆筒结构的波压力响应

以沉入式大圆筒结构为对象，通过设计随机波浪水槽实验，测取了在单筒和连续筒两种结构型式、两种沉入深度和两种波谱输入下结构表面的动波压力分布。波面高度以及波压力历程均在领域进行分析。通过计算结构表面沿高程和沿环向的波压力谱及波压力传递函数，将单筒实测结果与基于线性绕射理论的解析解进行了比较，同时也详细对比了两种结构型式下的实测结果。文中汇报了在研究中获得的新发现及进行的相应分析，特别是在结构——波浪——海床动力相互作用下对波压力响应机理以及针对连续筒的研究，可为工程应用提供有价值的参考。     

对电视安全播出的几点思考

从电视节目安全播出的角度出发，探讨如何采取切实有效的措施，确保电视节目的安全优质播出，力争使电视台的安全播出上一个新台阶，主要从播控系统的安全可靠性以及管理措施等方面进行阐述。     

A NEW LARGE CAVITATION CHANNEL IN CHINA SHIP SCIENTIFIC RESEARCH CENTER

1 .　INTRODUCTIONIntherecentdecades ,itisrealizedthatitisquitenecessarytocarryouttestsathighReynoldsnumberwithalowbackgroundnoiselevelinordertomeetmoreandmoreurgentneedsofmodernnavyandmaritimeindustry .Anewlargecavita tionchannelisdevelopedinCSSRCfortestingcompletehull/ propulsor/appendagesarrange ments[1] .Itrepresentsoneofthelatestintechno logicallyadvancedlargecavitationtestfacilities.Inthefollowingsections ,thefeaturesandthefirsttestresultsofthechannelwillbedescribed .2 .　DICRIP…     

THE FLOW PRODUCED IN PARTICLE-SUSPENSION BY AN INFINITE ROTATING DISK:SERIES SOLUTION

To the flow produced in particle-suspension by a rotating disk of infinite extent,the asymptotic behavior at infinity is analyzed.A corresponding series solution is presented.It isshown that this approach yields widely valid solutions of high accuracy for all the cases in whichthat suction or weak injection at the disk surface exists.For the cases that strong injection or par-ticle-free band exists,the series method fails.     

金刚石薄膜中晶粒尺寸的研究

扫描电子显微研究表明，化学汽相沉积的金刚石薄膜中晶粒大小比较均匀。但随着沉积时间和薄膜厚度的增加，晶粒逐渐变大，且每一层内，存在少量的大金刚石颗粒，讨论了晶粒尺寸变化和大晶粒形成的原因和机制。     

高装填密度装药技术中的选药计算

本文围绕叠片药这一装药技术,对某炮进行了有关选药计算,研究了制式火药与叠片药之间的弧厚配比和质量配比关系,并得出了一些有实用价值的结论.     

磁悬浮硬盘转子控制系统中时序电路测试技术

为提高磁悬浮硬盘转子控制系统的可靠性，提出了对时序芯片的测试方法：手工测试和计算机辅助测试；及时时序电路逻辑功能的两种检测技术；基于状态表的测试技术和自动检测技术。对于时序芯片，手工测试方法效率较低，计算机辅助测试方法适用范围更广；对于电路逻辑功能，基于状态表的测试技术操作相对困难，但无须增加额外测试电路；自动检测技术操作简单，且测试速度快，但需要增加辅助检测电路。时序电路测试技术对保证悬浮硬盘转子各组成部分协同工作十分重要。     

An efficient assumed strain element model with six DOF per node for geometrically non-linear shells

The present paper describes an assumed strain finite element model with six degrees of freedom per node designed for geometrically non-linear shell analysis. An important feature of the present paper is the discussion on the spurious kinematic modes and the assumed strain field in the geometrically non-linear setting. The kinematics of deformation is described by using vector components in contrast to the conventional formulation which requires the use of trigonometric functions of rotational angles. Accordingly, converged solutions can be obtained for load or displacement increments that are much larger than possible with the conventional formulation with rotational angles. In addition, a detailed study of the spurious kinematic modes and the choice of assumed strain field reveals that the same assumed strain field can be used for both geometrically linear and non-linear cases to alleviate element locking while maintaining kinematic stability. It is strongly recommended that the element models, described in the present paper, be used instead of the conventional shell element models that employ rotational angles.