静力学

The difference of fluid statics between different infiltration modes was studied. It was found that it was necessary to apply pressure to assure the transverse infiltration even if the C/Mg composite is a wettable composite system.

研究了不同浸渗方式的流体静力学差异，发现即使对于润湿的复合材料体系，外加压力也是保证横向浸渗顺利进行的必要条件。

Static evaluation is used to determine motions in a direction that bisects the angle between the directions of illumination and observation.

静力学计算是用来决定照射方向与观察方向之间的角分线方向的运动。

"When the record is played back, another stylus responds to the undulations, and its motions are then reconverted into sound."

放声时另一针与纹道接触，当唱盘旋转时，会再变成声音。静力学计算是用来决定照射方向与观察方向之间的角分线方向的运动。

According to the theory of swaging process, robot...

本文根据已有的旋锻加工理论、机器人理论以及机械理论，认真地研究了旋锻加工过程及其自动化过程的实现型式，提出了利用气动机械手来代替人手进行旋锻加工的实施方案，方案包括：上料、加热、旋锻、调头、再加热、旋锻、移出等工序的自动化系统，并依此设计机械手主体、顶杆机构、换向机构、移送机构等子系统及其控制部分，并通过静力学、动力学分析以及三维建模仿真优化技术论证了方案可行性、可靠性，试图解决钨杆旋锻加工过程的自动化问题。

It is assumed that the reader has previously studied the analysis of certain types of trusses in a course of statics.

假定读者在静力学课程中已经学过某些类型桁架的分析。

The basis of static, flat汇交system of forces, torque and couple Department of plane, plane general system of forces, center of gravity and centroid, the internal force and internal force diagram, tension and compression, torsion, bending, stress analysis and strength of the theory of the stability bar , the point of movement, the basic rigid-body movement, points of complex, rigid body planar motion, the movement of particle differential equations, dynamic general theorem, static and dynamic method.

静力学基础、平面汇交力系、力矩与平面力偶系、平面一般力系、重心和形心、内力和内力图、拉伸和压缩、扭转、弯曲、应力状态分析和强度理论、压杆的稳定性、点的运动、刚体的基本运动、点的复合运动、刚体的平面运动、质点的运动微分方程、动力学普遍定理、动静法。

With the development of computer and computation technology, finite element method has become a effective tool for the static and dynamic analysis of a car frame.

随着计算机硬件和计算技术的发展，有限元方法已经成为车架静力学、动力学性能数值分析的重要工具。

The main contents are as follows: Creating finite element model of cradle carriage, top carriage and trail of the howitzer. The structural static stress analysis of are dealt with finite element program system I-DEAS. For accuracy and computation cost, the nonlinear finite element structural dynamics model of the howitzer is created with different elements such as solid elements, shell elements and beam elements.

主要包括以下几个方面工作：建立了该炮摇架、上架和下架的三维有限元静力学模型，并应用I－DEAS有限元软件进行了强度分析；顾及计算准确性和计算成本，应用实体单元、壳单元和梁单元相结合的方法建立了该炮的非线性有限元结构动力学模型。

To overcome the disadvantages of one-support bearing, two-support bearing is applied to the fore part of spindle. The minimum displacement of the spindle nose is used as objective function to design the structure of spindle. By these ways, the static and dynamic characteristics of the spindle system are improved, satisfying the...

对于主轴结构，论文建立了以主轴前端动态变形最小为目标函数的优化模型，并对主轴结构进行了优化设计，从而提高了主轴系统的静力学和动力学特性，满足了设计要求。

Based on the models of imitating statics,the location of pure rolling lines on the contact ellipse was calculated to estimate the friction torque of sensitive ball bearing.

借助拟静力学分析得到了赫兹接触区纯滚动线的位置，积分求出了自旋及差动滑动引起的摩擦力矩，进而估算出灵敏球轴承的摩擦力矩，为验证所推公式的计算结果将其与相关文献的理论值及试验实测值进行了比较。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。