运动学

Based on the virtual prototype technology and simulative software platform Pro/E, the double rotating shaft supporting mechanism of wind tunnel testing model was designed and developed, and the mathematical model of angle control was established.

基于虚拟样机技术及仿真软件平台Pro/E，设计开发了风洞试验模型的双转轴支撑机构，建立了角度控制的数学模型，实现了机构的虚拟样机设计和运动学仿真，获取了被测试验模型运动情况的运动参数曲线，并对双转轴机构实施了干涉的动态检查，为双转轴机构设计方案的交流与评估，以及双转轴机构的制造与应用奠定了基础。

By using ADAMS/view,a simulation model of stopper is established which is based on analysis of its characteristics of variable structure ,some main problems of stopper are found by motion simulation analyzing,and optimization and self-adjustable structure without overconstraints of stopper is also made.

在分析变结构堵渣机的结构特征基础上，利用ADAMS软件建立了仿真模型，通过机构的运动学、动力学仿真分析，找出了机构存在的主要问题；并对机构进行了优化及无过约束的自调结构设计。

Beginning with forming mechanics of seal medium, the character of magnetic fluid has been researched and magnetic fluid, which fits the demand, is made out. Then from the point of fluid mechanics, the kinematics equation and Bernoulii equation of magnetic fluid are derived. Based on the production practic of sinterer, straight seal theory is given. Last of all, the accuracy of deriving of theory is proved by experiment.

作者首先从密封介质的形成机理入手，分析了磁性流体的性质，配制出符合要求的磁性流体，又从流体力学的角度推导出磁性流体的运动学方程和磁性流体的贝努力方程，根据烧结机生产的实际，进一步推导出应用于烧结机上的直线密封理论，最后通过试验验证了理论推导的正确性。

The hobbing process is based on the kinematic of a wheel–endless screw mechanism .

滚齿的原理是基于运动学上的&轮子和通长螺杆的啮合&机理实现的。

The hobbing process is based on the kinematic of a wheel–endless screw mechanism .

滚齿工艺是建立在涡轮-蜗杆机构的运动学之上。

Based on the foundation of anatomizing the structure of robot, taking full advantage of parallel move performance of the double triangle boom of the rock-drilling robot ac-cording to the condition of the diversification of the boomend location brought by the change of each joint, integrating the knowledge of robot kinematics, an expert system is established to adopt the personate means, that is" the first toorientate the end, then to orientate the location "to realize the speediness orientation.

作者在分析凿岩机器人钻臂结构的基础上，利用钻臂的双三角支架的空间平移性能，根据各关节变化所引起的钻臂端部位姿的变化，综合机器人学中运动学知识，建立一个专家系统，采用拟人化的方案———&先定点，再定位姿&，解决凿岩臂的快速定位问题，以实现描述各关节位置的变量的快速逆运算。

Secondly,based on rigid-body kinematics,the model of degree of freedom was formulated to describe the relationship between the machining requirement and the theoretical constraint degree of freedom .

工件自由度的合理约束是夹具设计的关键，基于定位原理的数学模型，根据齐次线性方程组解结构的性质，首先推导了三个定位方案的合理性判据；然后，基于刚体运动学，建立了描述加工要求和理论约束自由度之间关系的自由度模型；最后，利用典型实例详细讨论了自由度模型及合理性判据的分析应用过程。

With the theory of instantaneous screw of a rigid-body motion, the kinematic model of three-wheel type (1, 1) robots with two fixed wheels and a steering wheel in the cylinder of round ducts/pipes is presented and discussed.

运用刚体运动瞬时螺旋理论，对由两个固定轮和一个舵轮组成的(1，1)型三轮机器人在圆形管道中的运动进行了建模分析，并对此运动学模型进行了仿真。

This text sets out from kinetics property of the electronics inside the high frequency electromagnetism field,getting the influence of the radio frequency to inner resistance of cavity resonance and the relation with ion energy.

文中从高频电磁场内电子的运动学性质出发，得出射频频率的变化对谐振腔增益管内部阻抗的影响，及其与等离子体能量的关系。

The theory of multibody system dynamics is used to simulate valve trains' kinematics and dynamics characteristics, and the methods of establishing and analyzing the multibody system dynamics model for valve trains are discussed.

运用多体系统动力学的原理来模拟配气机构的运动学和动力学特性，讨论了配气机构多体系统动力学建模和分析的方法。

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％。