自振频率

Considering that both the solution of the structure natural vibration frequency and mode as well as its elastic stability coefficient can transform into eigenvalue problem of the structure dynamic equilibrium equation, taking the fundamental frequency and the elastic stability coefficient of the structure as the evaluation criteria, the possible arrangements of Mi-brace and X-brace for halfthrough CFST arch bridge with 360 m span were comparatively analyzed, and the advices for the reasonable space of the Mibrace and the X-brace were advanced.

鉴于结构自振频率、振型及弹性稳定系数的求解均可转化为源自结构动力平衡方程的特征值问题，先以结构基频及弹性稳定系数为衡量标准，对一座360 m跨的中承式钢管混凝土拱桥可能的米字撑及X撑布置方案进行了分析对比，并据此提出了X撑及米字撑的合理间距。

From the point of practice, the massless foundation model is applied for problem of the dam--foundation interaction. The regularity of the natural frequencies of the dam varying with the boundary size of the foundation is studied under various foundation conditions, and then the rational foundation size is decided.

从实用的角度出发，利用无质量弹性地基模型分析坝—地基相互作用问题，研究了不同地基情况下重力坝自振频率随地基边界范围变化的规律，确定了合理的地基边界范围，并分析了相互作用对坝体振型的影响。

These phenomena are roots of the unsteady excitation. ANSYS was used to solve the structure dynamic equations to obtain the natural frequency of vibration and mode shape of the blade.

本文应用工程软件ANSYS完成了叶片的振型和自振频率分析，结合数值计算得出的气动激扰，进行了叶片的共振分析。

In this paper,about the body of a special ultra-heavy semitrailer without beam,its model is built in ProE sofeware and its static analysis and modal analysis,which is in static state ,constant speed traction state and braking state, are performed in Ansys software.Displacement distribution,stress distrbution,the first five inherence frequencies and vibration modals are educed.

本文针对超重型特种无梁半挂罐车的罐体，用ProE软件建立起模型，用Ansys软件进行罐体在静载工况，匀速牵引工况及制动工况时的静态分析和模态分析，得出罐体在各种工况下的位移分布，应力分布及前五阶自振频率和振型，以验证该罐体设计的合理性。

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 results indicate that the boundary consumedly affect dynamic characteristic of the house.

结果表明，厂房的自振频率和振型受边界约束条件的影响较大。

The substructural technique is employed to parameters identification of frame, natural frequencies and generalized mode shapes of frame are computed.

本文把动态子结构方法引入框架结构参数识别中，算出结构的自振频率和广义振型。

The calculation results on the fixed wheel plane gate of Deqing gate showed that t...

对德清大闸定轮平面闸门的数值计算结果表明：水头对闸门的影响总趋势是使其自振频率降低、振动模态发生变化；闸门局部开启工况第 1阶频率较低，振型主要是门叶沿竖直方向的整体振动；低阶振动模态中除门叶竖直方向的整体振动模态外，其余各阶均显示为门叶的弹性变形振动。

By parameter(tower total height, shell thickness, meridional curvature) analysis of cooling-tower natural frequency, we find that, the basic natural frequency of cooling tower is sensitive to the top meridional curvature, an approximate formula is proposed based on the parameters, which can estimate the basic natural frequency of cooling tower.

通过对冷却塔自振频率的参数分析，如塔体整高、塔壳厚度、子午线曲率等，发现基础频率对上部子午线曲率较为敏感，并给出了用于估算大型双曲冷却塔基础频率的三参数公式。

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。