模态系统

The transverse wave disturbance along tangential base flow of circular vortex is discussed By using numerical method we study this instability of baroclinic flow which is mesoscale inertia wave instability on the cylindrical coordinate The influence of stratification stability N 2 , Coriolis parameter f 0 , the vertical shear of tangential wind z of the ambinent atmosphere and the latent heat on the growth rate of instability is studied From the above analysis and calculation, we can learn that there are Eady mode and mesoscale mode of transverse wave instability in circular vortex as well Furthermore we also learn that distribution character of mesoscale mode disturbance field of transverse wave instability, anomalistic "cats eye" structure of lower level and the character of the slowly spreading disturbance converges at low level and the quickly spreading disturbance converges at high level

作者中文名：李红金；陆汉城；宋晓亮；李鲲摘要：讨论涡旋大气中，存在沿切向基流传播的横波型扰动，并采用数值方法讨论了柱坐标系下圆形涡旋系统斜压气流中这类扰动的不稳定，这是一类中尺度的重力惯性波的不稳定。研究了涡旋环境大气的层结稳定度参数N2、切向风垂直切变Vz、凝结潜热、涡旋特性及科里奥利参数f0对不稳定增长率的影响。圆形涡旋中同样存在横波不稳定的Eady模态和中尺度模态，得到了中尺度模态的扰动场分布特征：流场的不规则"猫眼"结构及慢速传播的扰动均集中在低层，而快速传播的扰动均集中在高层的扰动特征。

By using the modal superposition method for the dynamic responses calculation of the linear oscillation system, a judging indictor in the energy norm form is given to determine the number of dominant modes on mode truncation .

针对用模态叠加法计算结构线性振动系统的响应，作模态截断的截尾模态阶数的取值，给出了能量范数形式的判断指标。

A kind of model of rotor-bearing-seal system dynamics is set up integrally in this thesis. Within this model, a new modal order-reduction method is presented, which takes the influence of nonlinear forces into account in the process of modal transformation, which makes the determination of the transformation matrix more reasonable and accurate.

提出了一种模态降阶新方法，在模态变换过程中充分考虑系统中非线性力的影响，使得模态变换矩阵的选取更为合理准确。

In this paper, modal reduction criterion is derived based on the system response taking as the model of Euler-Bernoulli beam, edi ting modal according to the value of modal costs. The conclusion can be used in a lar ge flexible complex structure system.

该文以欧拉－伯努利梁为模型，推导出基于系统响应梁的模态截断准则，根据模态价值大小取舍模态，其结论可推广到大型复杂结构系统。

At last, the modal experiment of the marine floating raft system was made, after marking value by measuring system, transducer were re-marked in particular which lose the marked value previously, after obtaining the marked value, the modal analyze of the marine floating raft with different thick was made by single input and multi-output modal analyze method

最后对浮筏隔振装置进行了模态实验，在对测量系统标定完后，重点对丢失标定值的力传感器进行标定，求出其标定值后，应用单输入多输出的模态分析方法对浮筏隔振装置的不同厚度的筏体进行模态分析。

The first-order of the modal flexibility for a real symmetric undamped structure with distinct eigenvalues was derived based on an efficient algebraic method. The formulae are simple and compact, and it is easy to program. Moreover, it only requires one eigenvector to be known to calculate the sensitivity of modal flexibility.

代数方法解析推导出无阻尼线性系统模态柔度一阶灵敏度的解析表达式，该表达式简洁紧凑，便于编程，而且在计算阶模态柔度的灵敏度时，只需一阶模态信息，具有显著的优点。

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。

The perturbation methods are the common analyzing method for studying thevibratory response of the mistuned bladed disk, but different perturbation methodshave their own relying conditions on the system parameters. In this dissertation, threekey perturbation methods are studied for their application conditions. Their relyingconditions on the system parameters are summarized.

本文对三种常用摄动法的构造特点及其适用性进行了研究，总结了它们在分析失谐叶盘系统振动响应时对于系统参数的适用条件；针对自适应摄动法在分析失谐叶盘系统振动响应时，对于基系统模态的选择难以控制的问题，提出了一种模态自动选择法。

The effects of blade stiffness mistuning on the natural frequencies and mode shapes in the frequency veering region were studied based on the lumped parameter model of a bladed disk. A parameter L was introduced to define the severity of mode localization.

基于叶盘集中参数模型，分析了叶片刚度失谐对频率转向区内的系统固有频率及叶片模态振型的影响，提出了一个描述模态局部化程度的参数，仿真研究了频率转向特征对失谐叶盘模态局部化程度的作用规律。

With the fluid-solid coupling of train oil tank clue to train speed increase, the fluid-solid coupling modal analysis of G70B oil tank is calculated by NSYS. The finite element model of fluid-solid coupling system is set up. The fluid-solid coupling modal analysis of G70B oil tank is done for light oil tank train under different kinds of loads and its natural frequency and modal shapes are obtained.

针对列车油罐因列车提速导致液固耦合作用突出的问题，运用ANSYS软件对轻型油罐车G70B型罐体的液固辐合模态响应进行实例分析和计算；建立车载油罐的液固辐合系统有限元模型；对轻型油罐车G70B型罐体进行在不同贮液比时的液固福合模态分析，得出固有频率和模态振型图。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。