模态

Beginning with raising the signal noise ratio of the global identification, the global identification method weighted with modal shapes is presented, which permutes and composes the elements of FRF in the form of the sum of modal shape squares and obtains global modal parameters with relatively high SNR.

本文在综合分析现代模态分析领域国内外现状的基础上，以学科的一些难点为研究对象，对系统模态参数识别、动态建模、动态修改领域存在的问题进行了广泛深入的研究，取得了一系列独创性的研究成果。

Based on the fact that the different modes of Rayleigh wave have different propagation velocities, the signals of Rayleigh wave which superposes in time domain can be separated in frequency-wave-number domain, different modes of Rayleigh wave are separated and extracted by Fourier transform.

摘 要：应用Fourier变换法分离提取地震记录中不同模态的瑞雷面波，其原理是：利用瑞雷面波各模式传播速度的差异，将时间域中叠加在一起的瑞雷面波信号在频率波数域中分开，以此实现分离提取各阶模态瑞雷面波。

After the rigidity matrix calculations, the FEM analysis program ANSYS is used to create models, with the truss structure and box cross-sectioned cantilever board beam as models.

在完成结构刚度矩阵计算的前提下，以桁架结构和矩形截面悬臂板为模型，利用有限元程序ANSYS进行建模，分析了不同类型的结构在温度变化作用下的响应，从而得知温度变化对桁架结构的模态参数影响不大，而对矩形截面悬臂板梁的模态参数有一定的影响。

The modal parameters of some typical structures, such as cantilever beam, stiffened plate were calculated with the iteration method.

用这种迭代算法计算了几种典型阻尼结构悬臂梁和压筋板的模态参数，计算结果与试验模态分析结果或理论解析计算的结果基本一致。

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。

In this study, the dynamic effect of different types of motor rotor, including the interference fit and clearance fit, are discussed by the experiment of modal testing and theoretical analysis.

本文藉由模态测试与分析分别探讨马达转子干涉配合及间隙配合於心轴上所造成的动态特性影响，并提出可的有限元素建模方式，藉由模态测试与有限元分析结果的比对显示，证明此种建模方式之确性，能做为未工具机主轴设计开发考。

The three dimensional model on engine block combination structure of a piston engine is established by the ANSYS software,and the modal analysis is carried out in the case of constrained model.

采用ANSYS软件对某活塞发动机机体和缸盖的组合结构进行了约束模态的有限元分析，得到了机体组合结构的前20阶约束模态的固有频率及相应振型。

With the optimal structural control method, a new approach to determine the optimal damping constant of viscous damper is presented.

对拉索-粘性阻尼器系统的动力特性进行了研究，得到了拉索刚度、阻尼器安装高度及阻尼系数等参数对拉索系统模态阻尼比的影响规律；根据最优控制原理，提出了一种确定阻尼器优化阻尼系数的方法，该方法确定的阻尼系数能保证前几阶模态阻尼比得到整体优化，改进了现有的设计方法。

Optimization of thickness distribution of unconstrained damping material was studied under constant damping material volume.

该方法用一组模态振型线性组合来定义阻尼层厚度分布函数，将模态参与因子作为设计变量来优化阻尼层厚度分布。

Finally, analyse the calculated results of this ship with another catamarans. From this result obtained unsymmetrical catamaran hull of this particular special vibration mode and analyse the vibration mode in order. The calculation is fairly reasonable, for the future of the asymmetric catamarans to calculate the vibration analysis of a number of reference.

最后将本船计算结果与另一艘双体船计算结果进行了比较分析，得到不对称双体船这种特殊船型的特殊振动模态，并就其振动模态出现次序进行了比较分析，说明本次计算是比较合理的，为今后不对称双体船的振动特性分析计算提供了一些的参考。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。