刚体

The theory analysis in allusion to the direction framework of a kind of air suspension is processed taking use of Langrate method of the multi-body dynamics theory. At the same time the kinematics analysis of rigid body and elasticity is also processed based on Virtual Prototype Technique which is popular in the world and the changing orderliness of wheel alignment parameters along with wheel jumpiness is got.

应用多体动力学理论的Langrage方法对一种空气悬架的导向机构作了理论分析，并基于国际上流行的虚拟样机技术对其作了刚体运动学和弹性运动学的分析，得到了该型空气悬架定位参数随车轮跳动的变化规律。

The relationship between the effect of friction on the motion and the parameters, including driving velocity, the kinetic friction coefficient, the friction drop number between the static and kinetic friction coefficient, and the joint equivalent spring stiffness, is investigated quantificationally.

本文分别计算这两类系统受同样激励时的摩擦扰动均值比，进行对比研究，在相同参数条件下，包括动摩擦系数，静动摩擦落差数和激励幅值，摩擦对微振动系统的影响一般要大于对有限刚体运动系统的影响。

According to rigid motion theory and composition law of vectors, the relative position and orientation errors of mating surfaces of mating parts were computed.

基於刚体运动学原理，研究了装配工夹具的姿态偏差对零件配合面位置偏差的影响，推导了配合件和基础件相应配合面的位置和姿态偏差的计算公式，建立了机器人装配系统零件配合过程的误差分析模型。

Through the characteristic parameters, the system's real-time moment of inertia is given. Then golden section adaptive control law and logic derivative control law both based on moment of inertia are designed. The two kind of control laws are combined to control the attitude of spacecraft and their simulation results are compared with the ones of PD control law which is designed based on the certainly-known system model. The results show that this adaptive control law is effective on the kind of time-variable system studied in this paper.

根据特征模型的参数推算了系统实时的转动惯量，设计了基于转动惯量的黄金分割自适应控制器和逻辑微分控制器，将这两种控制器相结合对带有可伸缩挠性附件的刚体进行姿态控制，仿真结果与基于确知系统模型所设计的变系数PD控制器相对照，表明了该自适应方法控制一类时变系统的有效性。

To register two partially-overlapping mesh surfaces, the least median of squares estimator is adopted to estimate the rigid body transformation, which is composed of two parts of"generation of hypothesis"and "verification of hypothesis".

为配准两个局部重叠的网格面，采用最小平方中值估算器来计算刚体变换，它由"假设的产生"和"假设的验证"等两个部分组成。

Based on dynamics theory of multi-body systems, a nonlinear mathematical model of frame-bogies with Lenoir damper for freight cars is established. A tank car is taken as an example to study the effects of main parameters on hunting stability, dynamic curving behaviors and running responses of vehicle systems.

以多刚体系统动力学原理为基础，建立了具有利诺尔减振器的构架式转向架的非线性数学模型，并以罐车为例，研究了转向架关键参数对车辆系统的运动稳定性、曲线通过性能及运行平稳性的影响。

Based on the methods of Lie group theory, we redefine the general workspace of the symmetry coordination methods.

特别是定义出能够连续描述刚体在空间旋转的姿态向量，避免了欧拉角描述方法所带来的旋转次序问题。

First, buckling collapse models were discussed, and the analysis on the stability of rock slope was carried out through rigid body limit equilibrium method and finite element method.

首先，对岩质边坡的失稳破坏的模式进行探讨，用刚体极限平衡法和有限单元法对岩质边坡进行稳定性分析。

Once more, applys three-dimensional CAD software Pro/Engineer establishing the geometry models of all kinds of parts in the crank link mechanism, then useing the Pro/E software assembling function assembles the components of crank link into the piston module, the connecting rod module and the crank module, then using Pro/E software mechanism analysis module (Pro/Mechanism), establishes the multi-rigid dynamics model of the crank link, and carries on the kinematics analysis and the dynamics analysis simulation, and it studies the piston and the connecting rod movement rule as well as crank link motion gear movement envelopment. The analysis of simulation results shows that those simulation results are meet to true working state of engine.

再次，应用三维CAD软件：Pro/Engineer建立了曲柄连杆机构各零部件的几何模型，在此工作的基础上，利用Pro/E软件的装配功能，将曲柄连杆机构的各组成零件装配成活塞组件、连杆组件和曲轴组件，然后利用Pro/E软件的机构分析模块(Pro/Mechanism)，建立曲柄连杆机构的多刚体动力学模型，进行运动学分析和动力学分析模拟，研究了在不考虑外力作用并使曲轴保持匀速转动的情况下，活塞和连杆的运动规律以及曲柄连杆机构的运动包络。

Based on spatial kinematics of rigid body, a mathematical expression for jointed manikin and its spatial position and orientation is discussed and the translational and rotational transform of the objects in space is studied.

以刚体空间运动学为基础，讨论了作为关节链结构的人体模型及其在空间的位置和方位的数学表示方法，研究了物体在空间的平移变换和旋转变换。

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。