自振

These earthquakes also arouse engineers to resurvey the behavior of end-plate connections. It is well known that end-plate connections have definite flexibility, which can increase damp, prolong period, and decease swing of structure.

端板连接是一种具有一定柔性的连接形式，当框架结构采用这种节点时，可以增加结构的阻尼，延长结构自振周期，减小震幅，从而降低震害，是抗震的理想选择之一。

In this paper, the mechanics model for continuous systems is adopted and the second Ritz method is employed to calculate the free vibration characteristics of chimneys.

本文中用连续系统力学模型，并选用里茨第二法计算烟囱的自振特性。

First, the modal perturbation method based on Ritz vectors is applied to solve the dynamic characteristics of Timoshenko deep beam including the effects of shear deformation and rotational inertia.

首先建立了钢筋混凝土深梁的求解方程，然后提出了求解Timoshenko梁特征值问题的模态摄动法，最后通过算例，说明不同含钢率下钢筋混凝土深梁的自振特性的变化情况。

The method of the damping and frequency of seismometer is obtained in time domain is introduced, with the method, some application examples of FBS-3A seismometer are given.

本文也介绍了在时域确定地震计的阻尼常数和自振周期的原理和方法，给出了具体在FBS-3A地震计上的应用实例。

Then the selfsustained oscillation and its stability are studied for the case when the nonlinearities are single-valued and symmetric.

然后研究了自振(过去这方面的研究有[1]及[2])及其稳定性，这时假定所有元件都是单值对称的。

The formula for lower limit of natural frequency of tapered pier of continuous beam bridge were derived by the combination of Rayleigh and Southwell method.

采用瑞利法和Southwell频率合成法，将基频表示成各惯性元与复位元所组成的子系统的频率合成，导出了变截面桥墩自振频率下限的计算公式。

The formula for lower limit of natural frequency of tapered pier of continuous beam bridge were derived by the combination of Rayleigh and Southwell method. The natural frequency of tapered pier was composed of the sum of frequency of each subsystem consisted in inertia component and deformable component.

采用瑞利法和Southwell频率合成法，将基频表示成各惯性元与复位元所组成的子系统的频率合成，导出了变截面桥墩自振频率下限的计算公式。

The data were analyzed by using of spectrum analysis method. Frequency and mode of structure are gained.

利用谱分析技术对所采集的数据进行了分析，得出了该结构的自振频率和模态。

We compose a neural network in which the input signals are the frame substructure natural frequencies and mode shapes, and output signals are the submatrix scaling factor.

框架子结构在动载作用下的自振频率和模态作为网络的输入，子矩阵参与系数作为网络的输出，用Levenberg一Marquardi算法训练网络。

The purpose of opening the orifice was to sluice. The influence of fluctuating pressure upon the dam was another problem which was concerned by engineer. The paper analyzed Shuangkoudu masonry arch dam. The result indicated that the dam natural frequencies which consider the dam and the reservoir water interaction have great different from the preponderant frequencies of fluctuating pressure, the dam's first rank of vibration was far away from the high energy region of the fluctuating flow, so the sympathetic vibration would not take place.

坝身开设孔口主要目的是为了泄洪，泄洪时水流脉动压力对坝体结构动的影响是设计人员关心的另一课题，论文针对双口渡浆砌石拱坝进行了分析，研究结果表明：在考虑坝体一库水相互作用时坝体自振频率和水流脉动压力的优势频率相差较大，坝体的一阶振动远离脉动水流的高能量范围，二者不会发生共振。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。