分析动力学

This model includes not only the effects on the dynamic capability of wood-working circular saw machine by the structure and installing position of each rotary components(such as saw,flange, fastening nut,principle axis,pulley,and so on)of wood-working circular saw machine,but also the effects by the structural parameter,working parameter,and the installing position of the bearing axletree.

本文通过对木工圆锯机结构、支承轴承特性及工作过程的分析，以国产MJ-90精密裁板锯转子系统(锯片、塔轮、锯轴、夹持装置和支承轴承)为研究对象，首次将木工圆锯机旋转构件作为转子系统，运用美国Rotating Machinery Analysis公司开发的大型转子系统动力学商业软件包XLROTOR，建立了木工圆锯机转子系统动力学模型。

Dynamics model of four-foot robotThe dynamics model of four-foot robot has been analyzed in detail with geometry and inertia parameter of pole.

利用杆件的具体几何和惯性参数对四足机器人的动力学运动方程做了详细分析，为今后的动力学研究奠定了基础。

The static and dynamic characteristics of the beam of a gantry-type machining center are analyzed by means of ADAMS and ANSYS. Considering effect of gravity and cutting forces, the static deformation of the beam is obtained after calculating the interacting forces between the guide and the slide block by ADAMS. Moreover, the contact parameters of the guide surface are acquired by dynamic tests and parameter identification, then they are applied to the simulation model of the beam-slide box system, whose natural frequencies and modal shapes are achieved by modal analysis. Furthermore, the effect of changes of the contact parameters on the dynamic behavior of the beam-slide box system is also investigated.

对一种国产龙门式加工中心的横梁关键部件，采用机械系统多刚体动力学仿真软件ADAMS和有限元分析软件ANSYS进行了静动态特性分析；在考虑重力和切削力作用下，由ADAMS计算出导轨与滑块间的作用力，从而计算出横梁部件的静态变形；通过动态测试和参数辨识方法获得导轨结合面特性参数并将其应用到横梁滑箱系统整体有限元模型中，经过模态分析得到系统固有频率和各阶振型图，并进一步分析了结合面参数变化对横梁滑箱系统整体动态特性的影响。

The actual reason is that firing process of gun system is a dynamic process, and it needs to be analyzed with dynamic methods.

这是因为火炮的射击过程是一个动力学过程，需要采用动力学分析方法。

Dynamics of mechanical systems with Coulomb friction, stiction, impact and constraint addition and deletion: I theory. Mechanism and Machine Theory.

通过对变拓扑结构系统的动力学建模过程几个关键问题的分析，为进一步建立与完善变拓扑结构柔性多体动力学奠定了基础。

In order to improve the dynamic quality of the whole system, the dynamic balance precision of the high speed rotor should be improved. Dynamic behavior of geared rotor system was analyzed using modal synthesis method

应用模态综合法分析齿轮传动转子系统的动力学特性，结果表明模态综合法能有效地降低系统的自由度，提高计算速度，对于复杂的多转子-轴承系统的动力学研究具有广泛的应用前景。

Using the Second Lagrangian kinetics,the dynamic features of the robot are analysed,the generated driving torque of the arms is derived,and its dynamical models are set up.The sliding-mode fuzzy control is adopted by of the MJR120 palletizer,and the numerical simulation shows that the control method is efficient.

本文经过对该机器人进行的详细动力学分析，确定了系统的广义驱动力，运用第二类拉格朗日方程建立了系统的动力学模型；对MJR120 码垛机器人在控制上采用了滑模模糊控制技术，通过仿真实验表明了该控制方法对MJR120码垛机器人进行控制的有效性。

Based on Wavelet Packet Analysis and Smoothed Pseudo Wigner-Ville Distribution, the experiment data is time-frequency analyzed. The experimental results indicate that the amplitude of the laser-induced acoustic waves increases with the laser energy; the frequency coverage is from 0 to 150 KHz, and in the meantime there is a peak located at about 25 KHz. In addition, the spectrum and the peak of frequency are basically stable in spite of the change of laser energy and target texture.

从基本的空泡动力学理论出发，推导了空泡各特征参量之间的关系，进而对空泡动力学模型进行了修正；采用有限差分法对空泡脉动进行数值模拟，得到了空泡脉动特性随液体粘性、空泡含气量、表面张力以及可压缩性的变化规律；实验上采用光偏转测试装置探测了激光空泡脉动以及空泡溃灭的细节过程，进而分析了液体粘性和作用激光能量对空泡脉动周期、泡半径及泡能等特征参数的影响。

In light of the research situation on wheel loader and hydraulic excavator in China, a software package named KDOSCM was developed. This software package has functions of MBS kinematic analysis, dynamic analysis, optimization, motion simulation and static force analysis, and also was the first one in the field of Construction machinery in China.

最后，本篇针对国内在轮式装载机和液压挖掘机方面的研究状况，开发了一套可用于工程机械进行计算机辅助设计和分析的软件包KDOSCM，该软件包可进行工程机械的多体系统运动学分析、动力学分析、优化设计，运动仿真和静力分析，该软件包的研制在国内尚属首次，填补了国内工程机械领域的一项空白。

According to the rotor dynamics theory,the vortex mechanism and rule of the rotor are closely related to the collision and friction interaction.

根据转子动力学理论，转子的涡动机理及规律与碰摩作用密切相关，考虑下部钻柱与井壁之间是否发生碰摩作用，应用转子动力学理论建立了2个下部钻柱涡动分析模型，探讨了下部钻柱涡动机理及规律。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失