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The features to evaluate the tooth contact quality such as the location of the contact point on the tooth surface, clearance between the meshing tooth surfaces, curve of the transmission error and the path of the contact point are investigated. The accurate geometric representation with non-uniform rational B spline of the worm and the wheel tooth surface is presented then the corresponding program is developed.

根据平面包络环面蜗杆传动的创成方法，建立了包含加工误差的蜗杆和蜗轮的齿面方程，分析了平面包络环面蜗杆传动和平面二次包络环面蜗杆传动的刚性啮合特性如误差对接触点的位置、齿面间隙、传动误差曲线和接触点在齿面上的轨迹的影响。

Near the contact boundary there exists a kind of metamorphic rock known as hornfels. It is resulted from the contact metamorphism when magma comes in contact with the sedimentary rocks and heats and squeeze s them.

在二者接触界线附近发育着一种叫角岩的变质岩，角岩的形成是由于岩浆人侵与周围沉积岩接触时所产生的热量和压力致使原岩发生变化而成。

Near the contact boundary there exists a kind of metamorphic rock known as hornfels. It is resulted from the contact metamorphism when magma comes in contact with the sedimentary rocks and heats and squeezes them.

在二者接触界线附近发育着一种叫角岩的变质岩，角岩的形成是由于岩浆人侵与周围沉积岩接触时所产生的热量和压力致使原岩发生变化而成。

Near the contact boundary there exists a kind of metamorphic rock known as hornfels. It is resulted from the contact metamorphism wh magma comes in contact with the sedimentary rocks and heats and squeezes them.

在二者 接触界线附近发育着一种叫角岩的变质岩，角岩的形成是由于岩浆人侵与周围沉积岩接触时所产生的热量和压力致使原岩发生变化而成。

Finally, the contact zone and contact stresses can be determined when a couple of contact loading and indenter's curvature are specified.

最后，利用所得直线族，在已知接触压力与压头半径的前提下确定接触区尺寸与接触应力。

Four-node degenerated shell element and rigid shell element are used in our FEM model.Updated Lagrange formulation and rate form constitutive equation are adopted to solve the problem of large strain and large rotation in sheet forming process.Sheet metal material property is described by plastic anisotropy yielding model and isotropic hardening model.Master surface-slave surface contact model is used to define the contact between tools and blank.Contact constraints are enforced with a kinematic algorithm and friction stress is computed by Coulomb friction law.Dynamic relaxation method is used to treat springback after forming stroke.

四结点蜕化壳单元和刚体壳单元分别用来建立板和模具的有限元模型；更新Lagrange法和速率型本构关系被用来处理板料变形中的大应变和大转动；材料模型采用塑性各向异性屈服与等向强化模型；通过主从面模型定义板料和模具的接触，接触算法采用运动约束法，摩擦力用库仓定律计算；并利用动力松弛法对回弹过程进行了计算。

In chapter six, A finite element model to evaluate the mechanics properties of thin wall structure is put forwards. The 4-node quadrilateral Hughes-Liu shell element with five through-the-thickness integration points is employed. The material is assumed to satisfy the elastic-plastic yield condition with isotropic hardening. The single surface contact algorithm is taken to deal with the contact searching. The priori stabilization procedures for the numerical control of the hourglass instability and the penalty method for the evaluation of contact force are used. The classical Coulomb law of friction is employed to evaluate the friction force.

第六章采用法向方向5点积分的4节点Hughes-Liu壳单元，前置参数法砂漏控制技术，等向强化弹塑性材料模型，分步增量应力回映方法，一体化接触搜寻算法，罚参数接触力计算方法及经典摩擦定律，建立了一种计算受冲薄壁结构大变形力学特性计算的有限元模型，通过对汽车A传动轴及汽车纵向方形吸能梁的大变形力学特性分析，验证了该有限元模型的正确性。

High temperature of contact and junction point causes an accident due to poor contact of knife switch s contact and connector of high voltage switch cabinet and impact of load.

高压开关柜刀闸触头、出线电缆接头往往因接触不良、负荷冲击等因素引起触点和接点温度过高，造成事故发生。

This paper researches the part third-order contact condition of tool and the surfaces by the contact principle of deferential geometry in to the 5-axis NC machining and analyzes the contact degree of the intersection line of the cutter and the surfaces.

运用微分几何中的切触原理，研究了在多轴数控机床中铣刀铣削圆与零件曲面的切触条件和局部坐标系下的局部三阶切触条件，并用截形对铣刀铣削圆与曲面的贴近程度进行了分析。

The apparatus includes a positive contact (50) positioned so as to engage the positive terminal (42) of the battery, a negative contact (52) positioned so as to engage the negative terminal (44) of the battery, a third contact (54) positioned so as to engage the third terminal (46) and a logic circuit (72) connected to the positive, negative and third terminals.

所述装置包括：一个设置用于与电池的正端（42）连接的正触点（50）；一个设置用于与电池的负端（44）连接的负触点（52）；一个设置用于与电池的第三端（46）连接的第三触点（54）；和一个与正触点、负触点和第三触点连接的逻辑电路（72）。

Very early and very clearly, FIP declared itself to be in favor of the development of pharmaceutical services.

FIP很早就清楚地宣布对药学服务工作的支持。

He did not, however, crack the BrandZ ranking of the top 100 global brands drawn up by Millward Brown Optimor for the Financial Times.

但他没有上&BrandZ全球品牌百强榜&。该排行榜由Millward Brown Optimor为英国《金融时报》编制。