刚体

The train is treated as multi-body system, and its dynamic equations are derived using the D\'Alembert principle. The rail structure is modeled as discrete-supported three-layer system considering the degrees of rail, sleeper and ballast.

车辆为多刚体系统，采用D'Alembert原理建立其动力方程；轨道结构采用考虑钢轨、轨枕、道碴自由度的三层点支承模型；采用有限元法建立桥梁动力分析模型。

At last, based on the discrete state equation, two kinds of adaptive inverse control system were set up to control the acceleration of the countertop under the random excitation.

最后，借助于振动台的离散五刚体模型，将振动台的台面加速度作为控制目标，进行了复合实验系统在随机输入作用下的控制仿真。

The problem of the equipment is that the calculation results appear distortion when angle is near to 45°.

论文在深入研究现有算法存在问题的基础上，采用了一种广泛用于刚体定位的数学参数算法——四元数法。

In terms of the transmission shaft balancing, it exists another problem that the shaft is not looked at as rigid body.When the rotor running at a high-speed ,under the action of unbalance force ,the transmission shaft will bend. It is certainly ideal to balance a transmission shaft as a flexible rotor.However, considering the mass production of automobiles, this method is obviously unpractical. In order to discreasing the flexible deformation, in this theory, the feasibility that double- plane balancing takes method the place of multi-plane balancing on a special place for one segment transmission shaft.

从传动轴平衡的角度来看，传动轴并非刚体，在汽车高速旋转时，由于不平衡力的作用会使传动轴发生挠曲，如果将传动轴作为挠性转子进行平衡当然比较理想，但是不符合汽车大批量生产的实际，为减少挠曲振动，利用挠性转子平衡原理，对于单根传动轴，从特殊位置进行校正，从而以二面平衡代替多面平衡是可行的。

Finally, we designed a two-stage controller to compensate the influence of dynamic and static friction, respectively.

最后分别针对动、静摩擦力的影响而加以设计控制器，以达到抑制挠性结构的振动，及结构中刚体部分精密定位的目的。

In the others, elastic deformation of components is considered but the deformation of joint is not considered.

当前的机器人研究不少是以刚体动力学为根本理论的前提下进行研究的，或者只考虑构件的弹性变形，而未考虑关节结合部的变形。

The main work and results are as follows:(1) According to the particular movement of high spot closed gripper mechanism, the full method of dynamic characteristics was presented and built. It contained relative motion analysis, absolute motion analysis, dynamics of rigid body's analysis and elastodynamics analysis.

本论文主要工作和取得的成效如下：(1)针对高点闭牙机构运动的特殊性，提出并建立了机构动力特性分析方法，包括相对运动分析、绝对运动分析、刚体动力学分析和弹性动力学分析。

Under the assumption that the Earth is a triaxial rigid body which is rotating freely in the Euclidian space, the elliptic integral solution of the Euler dynamic equation is provided, and then the numerical solutions of the Euler dynamic as well as kinetic equation are realized.

在Euclid空间中，假定地球是一个作自由旋转的3个主惯性矩互不相等的刚体，给出了Euler动力学方程的椭圆积分解，并实现了Euler动力学方程和运动学方程的数值解。

Chaos and its control in the planar libration of a magnetic rigid spacecraft with internal damping in an elliptic orbit are investigated.

研究在具有内阻尼的磁性刚体航天器在椭圆轨道上平面天平动的混沌及其控制。

Chaotic planar libration and its control of a magnetic rigid spacecraft with internal damping in an elliptic orbit near the equatorial plane of the earth are investigated.

研究在地球万有引力场和磁场中具有结构内阻尼的磁性刚体航天器在近赤道椭圆轨道上平面天平动的混沌行为及其控制。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。