自振

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。

After studying the curve of the vibration frequencies, which are varying with the changing of the structural parameters such as the rigidity of pier, the rigidity of straining beam, the rigidity of truss, the high of pier, the width of deck, and so on, some rules about the changing of vibration frequencies and the influencing of the structure that vary with the parameters were achieved.

研究了桥墩刚度、横系梁刚度、桁架片刚度、桥墩高度、桥面宽度等参数对结构动力特性的影响，通过对结构的自振振型及频率进行相应分析，得出结构参数变化对结构的横向刚度、竖向刚度、纵向刚度和扭转刚度及其他动力特性的影响程度及规律。

According to the result, the natural period of vibration of this bridge is long. This proves the suppleness of suspension bridge.

从结果来看，该桥的自振周期较长，第一阶振型对应的周期达到了2.19秒，体现了悬索桥的柔性结构的特性。

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。

AR model in linear filter theory is adopted to simulate pulsant wind. Combined with some typical cable-membrane structures, research on self-vibration of the structure has been conducted. Based on the previous work, the influence caused by the vertical wind component on the membrane roofs has been analyzed in time domain. It includes the vibration laws of the structure under separate horizontal wind component, separate vertical wind component and the collective horizontal wind component and vertical wind component. Significant conclusions have been drawn from the analysis.

然后本文采用线性滤波器法中的AR模型对风速场进行了模拟；之后又结合典型的张拉索膜结构研究了膜结构的自振特性；在此基础上，本文研究了索膜结构在竖向脉动风影响下的风振响应特性，其中分别研究了张拉索膜结构在单独水平风，单独竖向风以及水平风和竖向风共同作用下的振动规律，得出了有关重要结论。

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。

A model of trashrack is established for Guanyinyan Hydropower Station and the strength computation is based on the 3D dynamic FEM for the construction.

建立了观音岩电站拦污栅结构模型，基于三维动力有限元法对其进行抗震分析，计算得到结构的5阶自振特性，根据文献[1]规定的振型分解反应谱法以及动静结合的方法对结构进行动力分析，对结构的抗震安全性能作出评价，并指出了抗震薄弱部位。

The control of an electromagnetic valve in the ABN brake chamber forces the spring to vibrate at a frequency of 18 times per second while braking, and also with certain natural frequency reciprocating motion.

利用停易ABN制动气室弹簧的振动及电控装置控制电磁阀激振，迫使气室弹簧在整个制动过程中不但以每秒18次的自振频率振动，同时又以一定的固有频率往复运动，利用弹簧的储能作用，将刹车时产生的声能和热能用弹簧的势能和动能来置换，从而达到降低制动噪声、温度和磨损的目的。

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。

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。