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目前,我国铁路现有的货运站布局逐渐暴露出低效率、低效益、权力分散、利益割据、服务质量难统一等弊端,所以对货运站布局实行一定程度的集中化是有必要的。货运集中化是指货运业务的受理或办理的集中,是具体业务场所、人员、设备、权责等要素资源在地理配置上的合理集中以及在管理方式上的相应简明、清晰。在国民经济发展到相当水平,信息化程度较高的情况下,货运集中化表现为货运服务中心或类似的形式。 相似文献
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为了提高薄壁结构的耐撞性能,本文提出了一种高效的设计方法:。利用二次回归正交组合试验设计方案来选取设计点,在设计点处用有限元法代替传统试验来获取试验数据。然后通过最小二乘法建立了刚性墙最大位移、撞击力峰值和总质量的高精度响应面。综合考虑厚度的变化范围、安全性和轻量化要求,运用可行方向法对建立的响应面进行优化计算,得到了一组最优值。结果:表明本文的设计方法:具有很高的精度和计算效率,实现了提高薄壁结构耐撞性的目的:。同时也为车身复杂结构(如前纵梁、吸能盒等)的耐撞性设计提供理论依据和参考方法:。 相似文献
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In this paper an on-board computer system for the first Chinese Intelligent Space Robotic System was presented. A fault tolerance design on on-board computer (OBC) was proposed that allows commercial-off-the-shelf (COTS) devices to be incorporated into dual processing modules of on-board computer. The processing module is composed of 32-bit ARM RISC processor and other COTS devices. This innovative approach deeply relies on light weight/low cost equipment development using commercial miniaturized parts and non-space qualified technologies. As well as, a set of fault handling mechanisms was implemented in the computer system. The on-board software was organized around a set of processes that communicate between each other through a routing process. The qualification experiment shows that the fault tolerant on-board computer has excellent data processing capability and is enough to meet the demanding of the extremely tight constraints on mass, volume, power consumption and space environmental conditions. 相似文献
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一、港口向多功能的第三代港口转变综合物流时代的到来对于在全球物流体系中占有重要地位的港口产生了深远的影响,它加速了港口向第三代港口的演变。这种转变主要体现在:(1)从单一的中转节点向综合物流中心转变。由原来仅有的传统货流到货流、商流、资金流、信息流的全面大流通 相似文献