模态的

Prove that the endomorphic ring of any simple module is a division ring.

假如非零模 M的子模仅有零子模和自身，那么称M为单模，证明单模的自同态环为除环。

Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. There are many damping identification methods, but each one has different merit and defect. In order to find which one is the most reliable method with respect to certain characteristics, this thesis focus on how to identify structure's damping in time domain. The following works have been done in this thesis: 1. Investigate four modal analysis methods——the LSCE Method, the Ibrahim Time Domain Method, the Time Domain Collectivity Modal Parameter Method, the Rational Fraction Polynomial Method and improve on the ITD Method in arithmetic.

本文主要做了如下工作： 1、集中研究了四种常用的模态识别方法，即最小二乘复指数法、Ibrahim时域法、时域总体模态参数辨识法及有理分式多项式法，并对ITD法在算法上进行了一定的改进； 2、建立结构动力模型，利用这四种方法在具体条件下识别结构的阻尼，并绘制相应的图； 3、讨论不同的情况下，不同的识别方法对阻尼识别精确性的影响； 4、基于业已明确的阻尼识别的精确性，根据研究的需要，指出在实际的识别过程中，如何选择最佳的识别方法以及识别过程中需要注意的问题； 5、选择最为精确的阻尼识别方法，以导师李书进教授在日本京都大学防灾研究所强震反应实验室所做的一足尺木制结构房屋的动力测试实验为实测模型，识别其阻尼； 6、在本文的最后，尽作者所知，提出了一些需要改进的地方，并对未来的研究方向给出了作者的建议。

Rotational modes are independent of the transverse support stiffnesses of the carrier, ring gear, and sun gear. Translation modes are similarly independent of the rotational support stiffnesses. Large contact ratio do not mean lower mesh force. If either the number of sun or ring gear is not multiple of planet gear, system will run effectively, with lower impaction of tooth mesh in and out.

研究表明：扭转支撑刚度的变化影响系统的转动模态，径向支撑刚度的变化影响系统的位移模态；齿轮间重合度大并不等于轮齿间的受力情况好；行星轮与内齿圈齿数不为行星轮个数的整数被时，轮齿的啮入、啮出对系统的冲击小，系统的效率高。

Problems porduced in the application of manipulator for dipping EPC patterns into coating have been introcuced with effective solutions that an optimal route of manipulator in the space has been designed in accordance with technology requirement of dynamic dipping and mode parameter and machine instruction have been obtained by method of teaching and programming.Hence the whole dipping process being finished by motion of manipulator via controllet.

介绍了机械手在消失模铸造模样浸涂应用中出观的一些常见问题，并提供了行之有效的解决办法结合消失模铸造模样动态浸涂的工艺要求，设计出机械手在空间运行的最佳轨迹，运用示教和编程技法获得机械手运行的模态参数和机器指令，经由控制器驱动机械手抓取消失模模样并完成浸涂涂料的全过程。

The program can be used to track the limit load and flex point of space structure, can take structural imperfection into consideration, gets the buckling model and vibration model of three-dimension steel structure, analyzes the elastic-plastic status or stress distributing of any intersection and any point and draws the nephogram of stress distributing, the hysteretic line subjected to cyclic load and local buckling deformation.

本软件能够跟踪分析任意空间结构中各种反弯点和极限荷载、并能够考虑结构的缺陷分布影响、求解三维空间钢结构屈曲模态和振动模态。进而分析钢构件任意截面、任意点的应力分布及塑性屈服状态，绘制截面的应力分布云图及循环荷载下的滞回曲线，绘制钢构件的局部屈曲变形图。

The reciprocal effects between the frequency veering and the sensitivity ofmistuning for a bladed disk are studied. The investigation is based on a finite elementmodel. The reason and features of frequency veering of the bladed disk are analyzed.By using the localization parameter, the effects of mistuning on the system modallocalization of the bladed disk are analyzed in the frequency veering region.

分析了叶盘系统频率转向现象产生的原因及其特点；利用本文提出的模态局部化参数，研究了频率转向区域内叶盘系统的高密集模态对失谐的敏感性；分析了频率转向区域内失谐叶盘系统的振动响应局部化特性。

In order to verify the accuracy of the modeling built by ANSYS and the precision of the analytical results, the modelings of both rotor and motor are experimented at same time. After the comparisons of the numeric analysis results, experimental values are the foundation to consider the physical meanings and to suitably modify the modeling in order to decrease the differences between both results, to obtain the correct modeling type, to increase the analysis accuracy, and to provide designers a reliable basis.

为了证实本文中软体建模的精确度以及各项分析结果的准确性，以马达为例，在进行马达转子的模态分析时，一方面做马达模态测试实验，经由两者数值分析结果之比较，以实验值为基准，根据有限元素模型的物理意义，作适当的修改，减少分析及实验结果两者间的误差，以获得正确的建模型式，提高分析精确度，使提供给设计者为可靠的依据。

For the first time, SPAMP technique applied on the locomotive and passenger vehicles is proposed by using both the theoretical modal parameter analysis and the operational modal parameter identification techniques.

本文在铁路客车实测试验的基础上，采用试验测试和样机分析相结合的方法综合研究铁路客车动力学问题，提出适合铁路客车动态特性研究的环境激励下的模态参数辨识方法，建立铁路客车运行特性和运行模态参数的关系，探索这些理论和方法在铁路客车的正确应用。

To construct the analyzers, we also introduce another kind of devices called "mode retarders", which are analogous to wave plates because they introduce phase differences between corresponding HG modes.

构成此分离器的关键是一种名叫「模态相位延迟器」的元件，它的效果类似於「波片」，能对不同的厄米高斯模态产生对应的相位延迟。

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。

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。