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《中国汽车(英文版)》2009,(4)
尼桑:变色龙汽车购车时,颜色是决定是否购买的重要依据,但购车者往往会在两种颜色间举棋不定。如果有一款车能随意更改颜色,就能解决选择的难题。日本尼桑汽车公司目前正在开发这样一个项目,即运用纳米技术,开发一款能根据驾驶者个人喜好更改颜色的变色龙汽车。 相似文献
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Based on the first order shear deformation theory(FSDT), the nonlinear dynamic equations involving transverse shear deformation and initial geometric imperfections were obtained by Hamilton's philosophy. Geometric deformation of the composite cylindrical shell was treated as the initial geometric imperfection in the dynamic equations, which were solved by the semi-analytical method in this paper. Stiffness reduction was employed for the damaged sub-layer, and the equivalent stiffness matrix was obtained for the delaminated area. By circumferential Fourier series expansions for shell displacements and loads and by using Galerkin technique, the nonlinear partial differential equations were transformed to ordinary differential equations which were finally solved by the finite difference method. The buckling was judged from shell responses by B-R criteria, and critical loads were then determined. The effect of the initial geometric deformation on the dynamic response and buckling of composite cylindrical shell was also discussed, as well as the effects of concomitant delamination and sub-layer matrix damages. 相似文献
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王海盈 《电力机车与城轨车辆》2013,36(3)
高速铁路客车司机室外壳有铝合金和纤维强化塑料两种材质。文章从生产特点、材料强度、空气动力学三个方面,对铝合金和纤维强化塑料两种材质进行分析比较。 相似文献
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通过简化偶合器勺管与旋转外壳的位置关系,建立勺管与旋转外壳干涉的数学模型,建立优化目标函数和约束条件,编制优化程序及优化处理,将优化结果与实际产品的设计参数进行比较,并将优化结果进行三维建模.结果表明:优化结果正确,优化程序可以应用于系列偶合器优化,为设计提供最优化的设计参数. 相似文献
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蜗牛,一种软体爬行动物,外壳呈圆形或椭圆形.在人们的视线里,蜗牛永远都是慢腾腾的,遇到危险时,就把整个身体都缩进它那圆圆的壳里.看见它,人们至多能想起法国大餐中一道著名的美味菜肴,但怎么也不会将它与疾速前行的摩托车联系到一块儿. 相似文献
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9.插头使用专门的光学插头来连接光导纤维与控制单元。插头上的一个信号方向箭头表明(至接收机的)输入端。插头外壳形成与控制单元的连接。(1)光学端面为了最大限度地减小传送损失,光导纤维的端面必须光滑、垂直和清洁。只有使用专用的切割工具才能达到上述要求。切割面上的污垢和刮痕会产生很高的损耗(衰减)。光学端面通过内芯线的端面,光被传送到控制单元中的发射机/接收机。在生产过程中,光导纤维上被安装了激光焊接的塑料套圈或压接式的黄铜套圈,因此它能够被固定在插头外壳中的正确位置。(2)光纤总线中的衰减光导纤维状态的评定包括测… 相似文献