汽车车身A级曲面光顺方法

给出了汽车车身A级曲面的概念和要求,以汽车后风挡玻璃和行李箱盖为例讨论了A级曲面的光顺流程.在基本曲面光顺过程中,提出从曲面的控制顶点排列、补片数和次数等方面保证其构造品质;在过渡曲面的光顺过程中,强调了基本曲面理论交线在过渡曲面构造中的作用;分析了采用过渡曲面边界裁剪基本曲面时应注意的问题.     

Numerical research on wave-making resistance of trimaran

A 3D rankine panel method was developed for calculating the linear wave-making resistance of a tri-maran with Wigiey hulls. In order to calculate the normal vector and derivative of the body surface accurately,non-uniform rational B-spline (NURBS) was adopted to represent body surface and rankine source density.The radiation condition is satisfied using the numerical technology of staggered grids. Numerical results showthat the linear wave-making resistance of the trimaran can be calculated effectively using this method.     

广东新型平板显示产业的促进政策探究

采用SWOT分析法,对广东省新型平板显示产业的现状与竞争态势进行了深入分析,提出了广东省新型平板显示产业发展的政策设计方向,并尝试设计了为更好更快地发展广东省平板显示产业的一系列促进政策与鼓励建设政策.     

浅谈水泥混凝土面板施工中的质量问题

混凝土路面完工后，经常发生一些断板、起皮、起砂、露骨等，导致质量缺陷和影响行车舒适安全。就其产生的原因进行了分析，并结合实际提出防治措施共同探讨。     

基于ANSA的某汽车仪表板异响有限元分析及优化

汽车噪声大致可以分成两类:稳态持续噪声和瞬态噪声。路面噪声、发动机噪声等都是稳态持续噪声这一类,而异响一般都属于瞬态噪声。近些年来消费者越来越重视异响噪声。文章简要介绍了一种在汽车设计前期进行的,针对仪表板异响的分析优化方案。应用ANSA软件的前处理插件,可以快速对异响风险位置建立E-line;其后处理软件META可以快速对结果进行处理,并进行原因诊断,在设计前期给出指导建议。     

乌鞘岭隧道弹性支承块式整体道床施工技术

简要介绍了乌鞘岭隧道左线出口弹性支承块式整体道床设计和施工情况，对其施工工艺、进度及质量控制措施等作了论述，以期为今后同类工程施工提供参考。     

基础设施公私合营模式融资影响因素及空间溢出效应研究

在城市层面，影响基础设施PPP(公私合营模式)项目融资额的因素具有多样性。本文基于 2015—2017年我国地级市面板数据，采用空间回归模型对地级市基础设施PPP项目融资额的影 响因素进行实证分析，并验证了PPP项目融资额在空间层面具有溢出效应。研究结果表明：空间 误差模型相比混合OLS回归模型，对于分析PPP项目融资额影响因素的拟合效果更好；PPP项目 融资额在城市层面上具有显著的正向空间溢出效应，即一个城市PPP项目融资额更容易受到相 邻城市PPP项目融资额的影响。地方政府财政缺口、地区生产总值、固定资产投资额、人口密度 对PPP项目融资额虽然都具有显著相关关系，但在不同地区间影响的差异性较大。地方政府财 政缺口在中东部城市与PPP项目融资额呈现显著正相关，即地方政府财政缺口越大，城市越倾向 于采用PPP模式进行基础设施投融资；而在西部城市，两者间这种相关关系则不显著。     

装配侧气帘汽车的内饰件设计要点

装配了侧气帘后，汽车内饰设计成为侧气帘静态展开试验的一大障碍。文章从设计实践出发，结合侧气帘试验中内饰件的破坏形式，对装配侧气帘汽车的内饰件设计给出优化顶蓬结构、立柱饰板合理选材及强化遮阳板连接结构等设计方案和数据，有效地避免了内饰件在侧气帘静态展开试验中发生破损的现象，从而确保装配了侧气帘的汽车可以顺利通过试验。     

车身冲门锁锥形孔的应用研究

为提升汽车的感官质量,将门锁安装由平头螺栓配合圆孔的安装方式更改为锥形孔配合锥形螺栓的安装方式,消除门内板上的螺栓突兀。通过研究车身冲门锁安装孔的工艺流程和设备组成,设计导向销精确定位门内板,保障锥形孔的位置度。同时根据门内板的数模、料厚和材料,选型和设计驱动机构的冲压力、空行程、力行程和钳体等,完成一种冲孔机构的设计,在车身车间实现快速、精确成型门内板上的门锁锥形孔。     

Experimental and numerical analysis of a tanker side panel laterally punched by a knife edge indenter

The paper presents finite element simulations of a small-scale stiffened plate specimen quasi-statically punched at the mid-span by a rigid indenter, in order to examine its energy absorbing mechanisms and fracture. The specimen, scaled from a tanker side panel, is limited by one span between the web frames and the stringers. The paper provides practical information to estimate the extent of structural damage within ship side panels during collision accidents. Moreover, the results of this investigation should have relevance to evaluate grounding scenarios in which the bottom sustains local penetration. This is possible since the structural arrangement of the double hull and the double bottom of tanker vessels is very similar. The experimentally obtained force–displacement response and shape of the deformation show good agreement with the simulations performed by the explicit LS-DYNA finite element solver. The numerical analysis includes aspects of particular relevance to the behaviour of ship structures subjected to accidental loads which could give rise to difficulties in interpreting finite element calculations. In particular, the paper comments on the material nonlinearities, the importance of specifying the precise boundary conditions and the joining details of the structure. The considerable practical importance of these aspects has been the focus of attention in previous publications of the authors which evaluate the experimental-numerical impact response of simple ship structural components, such as beams and plates. Therefore, this paper uses the definitions proposed in those references to evaluate its applicability in the scaled tanker side panel, as an example of a more complex ship structure.