自振频率

Based on a lot of calculating analyses on various working condition, the thesis give the approximate calculating formula of multi-order natural frequency of vibration of round silo.

对不同直径、不同高度的实体单仓进行了大量的、多种工况的计算分析的基础上，提出了计算圆型筒仓的多阶自振频率的近似计算公式。

Furthermore, according to the relationship between natural frequency and span, the computational formula reflecting the above effects is erected based on the 2 design speed.

并且根据桥梁自振频率与跨度的关系，将此公式简化，形成基本的以跨度表示的动力系数计算公式。

The (0,1) placement variables are treated as continuous variables and then rounded after the optimization. The computational formula of the sensitivities of the freevibration frequency with respect to placement variables is derived.

在压电材料组成的桁架结构的自由振动频率优化设计中，提出了压电杆件配置的(0，1)设计变量并将其连续化处理，推导了压电桁架自振频率对该设计变量的灵敏度计算方法。

Based on the engineering structure, three dimensional finite element model is set up by SAP2000N software and its characteristics is calculated by eigenvectors method.

根据实际结构，在软件SAP2 0 0 0N的基础上建立了三维有限元模型，采用特征向量法，得到了该结构的各阶自振频率和模态的理论值。

The results have given some reference for rational outrigger designing.

根据核心筒与外排柱刚度之比、核心筒与水平加强层刚度之比、核心筒和外排柱沿高度变化的刚度之比的不同取值，得出了该体系前3阶自振频率与加强层位置的关系，为合理设计加强层提供了参考。

The mechanism of two phenomena is rerealed by the perturbation theory.

利用矩阵摄动理论揭示了2种现象的发生机理，得到空间结构模态局部化和跃迁现象发生的内因是结构自振频率的密集分布，外因是结构物理参数的微小变化。

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。

The liquefiable site was simplified as a double-degree-freedom model and the formula for calculating the reduction of horizontal natural frequency induced by liquefaction was attained.

将可液化场地简化为双质点模型，给出了液化导致场地水平自振频率下降的计算公式，推导出了频率下降率的下限值。

In this paper, firstly the influence of the delamination upon the natural frequencies of a laminated beam is studied in detail. By partitioning the delaminated beam, its natural frequencies are obtained.

本文首先详细分析了层合梁的脱层现象对其振动频率的影响，通过对脱层梁进行分区处理，得到了脱层梁自振频率变化的规律。

In this paper, the finite element method was applied to the vibration characteristic analysis for the upper bracket and head cover of a certain large-scale hydropower generator unit.

采用有限元法对某大型水轮发电机组的上机架和顶盖结构进行了振动特性分析，得到了结构的自振频率和相应的振型，结果表明：顶盖产生共振的可能性较大，应加以预防。

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。