您当前的职务: 首页 > 舆论浏览

1. chinaXiv:201904.00072 [pdf]

Impact of Urban Rail Transit on Business Districts Based on Time Distance: Urumqi Light Rail.pdf

常烃
列入: 地球科学 >> 政治经济学

基于超制图学的思考,成立模型将乘坐轻轨的时光相差换算成以米(m)为单位的空中距离。在此基础上,穿过地理信息系统(GIS)的地图投影空间变换方法,用换算出的距离重新定义两地间距离,变形原地图形成时间相差地图。名将时间相差空间化,利用艺术手段,对时间相差进行可视化表达。结果发现,轻轨对于城市形象的影响受到站点离所选择的中心点距离的影响,呈现离中心点越远变形越大;离中心点越近变形越小。轻轨对商业中心布局之影响基本呈现圈层分布。岁月相差压缩了传统城市形象。随着乌鲁木齐地铁建设过程的推进和基础设施的一揽子,都市内部进一步减少时间相差仍有很大余地,已有商业中心应进行升级。基金研究为济南城市建设提供一种新的参考与思路。

付出时间: 2019-03-31 点击量7282载入量509 ???fullview.comment??? 0

2. chinaXiv:201804.00310 [pdf]

Analysis of the Hydroelastic Performance of Very Large Floating Structures Based on Multi-Modules Beam Theory

Xu, Jin; Sun, Yonggang; Li, Zhifu; Zhang, Xiantao; Lu, Da
Comment:本文发表在《Mathematical Problems in Engineering》
列入: 通运输工程 >> 船只、舰船工程

The hydroelastic behavior of very large floating structures (VLFSs) is investigated based on the proposed multi-modules beam theory (MBT). To carry out the analysis, the VLFS is first divided into multiple sub-modules that are connected through their gravity center by a spatial beam with specific stiffness. The external force exerted on the sub-modules includes the wave hydrodynamic force as well as the beam bending force due to the relative displacements of different sub-modules. The wave hydrodynamic force is computed based on three-dimensional incompressible velocity potential theory, and the boundary element method with the free surface Green function as the integral kernel is adopted to numerically find the solution. The beam bending force is expressed in the form of a stiffness matrix. The coupled motion equation is established according to the continuous conditions of the displacement and force. The motion response defined at the gravity center of the sub-modules is solved by the multi-body hydrodynamic control equations, then both the displacement and the structure bending moment of the VLFS are determined from the stiffness matrix equations. To account for the moving point mass effects, the proposed method is extended to the time domain based on impulse response function (IRF) theory. The accuracy of the proposed method is verified by comparison with existing results. Detailed results through the displacement and bending moment of the VLFS are provided to show the influence of the number of the sub-modules, and the influence of the moving point mass.

付出时间: 2018-03-30 点击量1196载入量707 ???fullview.comment??? 0

  [1 页/ 2 条记录]

   
    <object id="3fa6116e"></object>