The other effect brings about by coat on a large scale is discussed preliminary which including increasing the " hot island effect " of cities ; increasing the hydrous of the roads after rain and increasing the sinkage of ground surface in the city 同时初步探讨用水泥以及沥青大规模地覆盖土壤所造成的其他影响，这些影响包括加重了城市的“热岛效应” 、加重了城市由于雨后道路积水所导致的交通堵塞、加重了城市地面的沉降。
2.
Simulator tests indicates the speed ; wave ; angle between ship and wave are main factors of the sinkage . difference factors given difference sinkage with simulator tests . 3 . the date of width ; depth are two important factors of channel design , the relationship between width to depth is speed （ 3 ）航道宽度和航道深度的关系，联结这二者关系是航速，航道宽度和航道深度是决定航道参数的二个重要因素，并相互存在着一定的关系。
3.
The content of the study as follow : 1 to choice the ship form , mainly ship ' s overall size ; draft , according to design of shanghai deep - water port and development of container ; 2 . to deside the date of width ; depth ; path ; tract and sinkage through simulator tests ; 3 . to replenish and modify some date for channel design to very large container vessels in " design code of general layout for sea port " 4 . to study ship ' s turning area ; ship ' s stop distance the new and special content of the study as follow : 1 . statistics of path at the channel given by difference operators with the affections certain wind . currents . seas and other influences shows the path really needed under certain condition 并可在各类航道和水域的通航安全评估及操船方法，航迹带宽度，航道宽度，航迹带分布，船舶各种航行状态时的下沉量研究中应用。本课题研究的内容： ( 1 )根据洋山深水港设计规划和集装箱船舶的发展趋势，通过研究、分析、比较，选择最合适的船型，尤其是船舶主尺度和船舶吃水。 ( 2 )在大量模拟研究情况下，得出进港航道所需的航道宽度和深度。
4.
Now some universities and institutes of china have made some samples of the lunar rovers and theirs wheels , but until now the wheel ’ s mechanical performance is seldom researched and tested . this paper will analyze the mechanical performance of the wheel and design a test - bed to test the performance of the lunar rover ’ s wheel . firstly , the mechanical characters of the soil are separated to press - sinkage character and shear character based on bekker ’ s theory , and common press - sinkage and shear models are introduced and the theory of lankine passive earth pressure is also introduced 根据bekker半经验法的基本思想,将土壤的力学特性分解为水平方向的剪切特性和竖直方向的承压特性,阐述了地面力学中常见的土壤的承压、剪切等力学模型,并引入了朗肯被动土压力理论,为建立车轮在松软土壤中前进和转向的力学模型奠定了基础,同时进行了实验土壤的剪切实验,测量了土壤的内聚力和内摩擦角等参数。
5.
With the fea software ansys and shell element which has high - precision , this dissertation optimize the size and thickness of skeleton section and seek steel pipe which still have strength and stiffness surplus under static state working condition : sinkage of 240mm of rear wheel . it ' s fully loaded in the state of static bending and torsion . after that , amelioration is achieved for even strength design 本课题运用ansys有限元分析软件，并且使用精度较高的shell壳单元作为建模单元，在静态条件下，通过对左右后轮下沉240mm的弯扭联合工况的模拟分析，寻找出骨架中存在强度和刚度富裕的构件，使之达到轻量化改进的目的。
