变位

• After thoroughly analyzing the influence of each pump parameters on the gear pump performance , the paper developes the criterion for optimum gear parameters , which can be utilizied in practice easily for gear manufacturing using normal involute gear hob with two - fillet type . the conclutions studied by the paper are : 1 . both the addendum coefficient and the deddendum coefficient of the pump gear should be 1 . 125
  以目前国内普遍使用的双圆弧头全齿高为2 . 5倍模数渐开线标准滚刀作为泵齿轮的加工刀具，通过对齿轮加工原理的分析，提出了欲使泵齿轮参数达到最佳，泵齿轮的齿顶高系数和齿根高系数都为1 . 125 ；对变位系数的确定应考虑到泵齿轮的根切、齿顶厚、重合度以及侧隙因素；泵齿轮为避免过渡曲线干涉，必然要存在根切现象。
• Yingxian ancient wooden pagoda is a flat - form tall building , which was formed by the superposition of monolayer temples . the height of 67 . 31 meters made it encountered two unprecedented puzzles : firstly , with the height increased whopping , wind resisting and aseismatic capability become the main question of the whole structure ; secondly , because of the weight increased unconventionally , members of the lower 1 ~ 3 floors hold overloading perpendicular to grain and they brought large vertical deformation
  相对于一般殿堂结构,高度和自重的成倍增加,使木塔遇到前所未有的两项难题:其一是因自重增加,使承受上层柱轴向荷载的梁(普拍枋和梁? ）横纹局压应力成倍地超过设计强度而产生严重的压缩变形甚至劈裂,导致木塔整体竖向变位。
• Furthermore , the internal forces and displacements when pretensioning the structure can be obtained easily by means of the suggested method under many conditions such as pretensioning a tendon , pretensioning several tendons simulta ? neously , pretensioning one strand in a tendon or pretensioning tendors by stages and in groups
  当单根杆件施加预应力、多根杆件施加预应力、同一杆件各股分别施加预应力以及分级分批施加预应力时，采用本文提出的方法可方便求得各工况下预加应力全过程的网架内力和变位及其变化规律，并可一次性地完成预应力施加工作。
• Based on the research works of predecessor , the theory on the displacement of soil strata in deep foundation excavation construction and its application are studied in detail . by analysing the supervision , statistics from , the practical excavation engineering , soil rheology is thought to be the main reason of the displacement heavy of the soft soil and the destruction of the enclosure structure , in deep foundation excavation construction on condition of the high theriomorphic of enclosure structure and good seepage resitting
  本文在已有研究成果的基础上，对大面积软土深基坑开挖时土层变位理论及应用进行了探讨：依据现场监测数据，推导出开挖时软土变形的经验公式，分析了软土深基开挖在围护结构刚度大、基坑防渗效果好的条件下，基坑土层变位、围护结构受力破坏发展的主要原因。
• 3 . base on the numeric method of finite element , the influence of interrelated shift coefficient and tooth number z to bend intensity of gear is studied . with the increase of the tooth number , tooth root maximum pull stress decrease ; with the increase of the interrelated shift coefficient , tooth root maximum pull stress increase
  3 、基于有限元数值计算方法，分析了不同关联变位系数和齿数z对齿轮弯曲强度的影响：随着齿数的增大，齿轮最大拉应力减小；关联变位系数越大，齿轮最大拉应力越大。
• The further research in port engineering pile foundation is considered to be important of such as behavior and bearing capacity of laterally loaded single piles and pile groups , and the functional mode of wharf foundation pile under flood tide torrent , and load - deflection curve , and negative skin friction along the pile , et al . the bearing capacity and the negative skin friction of port engineering piles are analyzed , to satisfy port engineering development demand better
  在港口桩基工程领域，港口工程水平承载(群)桩的工作性状以及承载力计算方法，涨潮急流等动态荷载作用条件下码头基桩的受力性状，桩的作用荷载与变位趋势关系、桩的负摩擦等问题都要求作进一步的研究。本文致力于以港口工程桩基为主要研究对象，对港口工程(群)桩基水平承载力和负摩擦力进行研究，以更好地满足港口工程建设需要。
• On the basis of utilizing geometric conversion and modification principle of spur and helical gears , the mathematical model for geometric parameters and modification of overlapping coefficients of gear was established , and the calculation method of sliding frictional coefficients under elasto - hydrodynamic lubrication state was introduced , thus let the calculation method of meshing efficiency of gears be more coinciding with the practical application
  在运用直、斜齿轮几何换算和变位原理的基础上，建立齿轮的几何参数和重迭系数修正的数学模型，介绍了弹流润清状态滑动摩擦因数的计算方法，从而使齿轮啮合效率计算方法与实际应用更吻合。