This paper presents an overview of the swimming mechanisms and the caudal fin locomotion employed by fish . a practical method is brought forward that use the track of the caudal fin oscillating to study the locomotion of the robotic fish . and this paper mimic the bcf ( body and / or caudal fin ) propulsive fish with a three - link robotic fish model ( oucefish - i ) for oscillating foil propulsion , and then describes the design ( hardware and software ) of it in detail 本文对鱼类的游动机理和尾鳍运动学原理进行分析，提出利用尾鳍摆动轨迹研究机器鱼的运动学原理方法，设计并实现了一种三关节仿bcf ( bodyand orcaudalfin身体加尾鳍)高效推进方式机器鱼模型( oucefish - ) ，通过对机器鱼的姿态、运行轨迹进行控制和分析，并对机器鱼的实验结果做了分析，达到研究分析机器鱼的运动学原理的目的。
Basing on investigating a number of materials and references , this research analyzes the work mechanism and the locomotion property of several kinds of representative dispersing mechanisms of the rice seeding throwers , and a ordinal rice seeding thrower by transplanting machinery is bring forward with efficient , trusty and simple property , which can directly use the existing manpower rice seeding pan and economize the breeding cost and the work space because of rice seeding pan need n ' t be set in machinery 本文在充分调研的基础上，首先分析了国内外目前常用的几种代表性的抛秧机分抛机构的工作机理和运动特性，然后提出了一种具有高效、可靠、简单以振动输送来实现分秧的有序水稻抛秧机。该抛秧机直接利用现有人工抛秧秧盘，不需把秧盘放在机器上，节省育秧成本和工作空间。
( 4 ) the dike breach risk of the south bank is relative higher in wandering reaches . ( 5 ) the dike breach risk of the north bank is higher than the south bank in winding reaches . simultaneously , the evaluation results manifest that the evaluation indexes system established from the locomotion of incoming water and sediment load , the regional crustal stability , the evolvement of river regime and the stability of river dikes , can reflect the actual situation of hang river in the lower yellow river more fully 评价结果同时表明,从水沙运动、区域地壳稳定性、河势演变和堤防稳定性4个方面建立评价指标体系,能够更加全面的反映黄河下游悬河的实际情况;运用多层次模糊综合评判法能够较好地解决影响因素众多、作用机制复杂的悬河决溢风险问题;运用gis技术强大的空间分析功能,使黄河下游悬河不同空间位置的决溢风险得到了量化,可以客观地反映黄河下游河道不同空间位置决溢风险的差别,对于指导防洪和河道治理的实践具有重要的现实意义。
2 ) we analyse the locomotion equation , trajectory parameter , trajectory ellipse parameter , average angel velocity formula under the condition that we only think about the g - force . we ascertain the relationship of the target place and the moving velocity and flying time by keplei equation , and ascertain the trajectory and the data of the place target landing , finally we analyse the effect on the target trajectory and landing from the earth ' s rotation itself ( 2 )分析了在只考虑地球引力情况下的雷达目标运动方程、轨道面参数、轨道椭圆参数、平均角速度公式;通过迭代求解开普勒方程确定了目标位置、目标运动状态和飞行时间的关系;确定了雷达目标的轨道、落点数据;最后,分析了地球自转对目标的轨道和落点的影响。
Based on analysis of hang river ' s actuality in the lower yellow river and researches related with evaluation of dike breach risk , it is put forward that the influencing factors of hang river dike beach risk in the lower yellow river should involve 4 aspects , the locomotion of incoming water and sediment load , the regional crustal stability , the evolvement of river regime and the stability of river dikes . the evaluation indexes system of hang river dike breach risk and uniform synthetic model are established from the 4 aspects . with the support of gis technology , the evaluation indexes system and the model of multi - hierarchical fuzzy synthetic judgment are applied to estimating the dike beach risk of hang river in the lower yellow river under different flood conditions 在对黄河下游悬河现状、决溢风险评价有关研究进行分析的基础上,本文提出黄河下游悬河决溢风险的影响因素应当包含水沙运动、区域地壳稳定性、河势演变和堤防稳定性4个方面,并从这4个方面建立了黄河下游悬河决溢风险评价的指标体系和统一的综合评价模型;在gis技术的支持下,运用评价指标体系和多层次模糊综合评判模型,对不同洪水情景下黄河下游悬河的决溢风险状况进行了评价。
