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Research on cone/bit speed ratio simulation model of tri-cone bit s;2. In this paper, the kinematics simulation model of tri-cone bit s was established according to the roller cone bit geometry and kinematics.

根据钻头几何学和运动学建立起了随钻运动的三牙轮钻头的计算机运动学仿真模型，该仿真模型既表示出了钻头上各牙齿的形状、大小和在钻头上的分布情况，又可真实反映钻头钻进过程中各牙齿的瞬时位置和相互关系。

In summary, the 3D visual simulation system for relay based on the OpenGL is developed in the foundation of research on its essential technologies in this paper, and the system can not only use for direct current rapping relay design directly but also will provide the powerful support for 3D visual simulation technology widely applied in relay industry.

综上所述，本文在较深入的研究了基于OpenGL的继电器三维可视化仿真系统的理论及关键技术基础上，开发了基于OpenGL的三维可视化仿真系统3DJDQCAD，其研究成果不仅可直接用于直流拍合式继电器的开发设计，而且也将为三维可视化仿真技术在继电器行业中全面应用提供有力支持。

On the basis of setting up mathematical model on blowing energy of 50KJ hydraulic die forging hammer, through simulation analysis, the relation curve of the blowing route and the blowing energy have been attained under the certainly filled atmospheric pressure and the height of loaded die, and the calculation result of simulation has been validated by experiment.

新闻摘要：在建立了50kJ液压模锻锤打击能量的数学模型的基础上，经过仿真分析，得出了在一定充气压力及装模高度下的打击行程与打击能量的关系曲线，并对仿真计算结果进行了实验验证。

To describe and smooth curves and curved surfaces in finite element simulation, a method for modifying die surfaces in plate deforming simulation is proposed.

为解决在有限元中曲线、曲面的描述和光顺问题，提出一种适合有限元模拟的模具曲面修正方法。

In this study, the traditional angular spectrum method of diffraction simulation is improved. By introducing band-with limitation, a new method is put forward, which is suitable for diffraction simulation both in far and near field.

本文对传统的角谱法衍射计算做出改进，通过引入带宽限制给出一种新的衍射计算方法，能同时兼顾近场和远场的衍射分布计算。

Simulation model and experimental prototype of direct-driven WECS were built,then the application of proposed control strategy was verified by simulation and experiment.

建立了永磁直驱风电系统仿真模型和实验样机，并对所提控制策略进行了仿真和实验验证。

It has improved the accuracy of calculation of the numerical simulation effectively and carried on three-dimensional flow simulation emulation to draft tube and analyze the result finally.

并最终对尾水管进行了三维流场仿真计算和结果分析。

Applying the software ADAMS for dynamic simulation and Pro/E for three-dimensional design creates the mechanical system of virtual prototyping model of the 200t crawler crane. The models of the drag bar, the spring backstop, the luffer rope and the crawler in the system are established well by ADAMS/View module. The dynamic simulation of the complete mechanical system is researched at series of work condition, which occurs possibly the crawler crane boom backward tipping as the crawler crane unloads suddenly.

本文应用虚拟样机技术动力学仿真软件ADAMS，结合三维实体设计软件Pro/E构建了200t履带起重机的虚拟样机机械系统模型，并利用ADAMS/View模块完善了系统中拉板、弹簧式防后倾装置、变幅钢丝绳和履带模型：研究了履带起重机突然卸载时可能发生臂架后倾的一系列工况下，整机机械系统模型的动力学仿真。

For the sake of the convenient application of the unsteady flow simulation of drainage system, the block diagram-oriented dynamic simulation methodology for the drainage pump station is studied based on the SIMULINK platform.

为了便于排水系统非恒定流模拟技术的应用，该文在SIMULINK平台上对面向结构图的排水泵站可视化仿真途径进行了探讨。

The method of kinematics analysis for four bar mechanism is used to the kinematics analysis of the roller chain drive,and the simulation of the driving process of the chain drive is carried out by an Windows program Curve of the instantaneous ratio is performed The computer simulation of the kinetic property of the roller chain drive is implemente

铰四杆机构的运动分析方法可用于链传动运动特性的精确分析，采用WINDOWS编程对链传动的运动过程进行了模拟，并对链传动瞬时传动比作出了曲线，实现了链传动运动特性的计算机模拟分析。

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％。