自振

Deflection and strain of the given section are analysed through dead-load field test, Hanger endogen force, autooscillation character, impactor factor, damage ration of the main span and approch span are analysed.

在荷载试验方面，对测试截面的挠度和应变进行了分析，同时对吊杆内力及主桥和引桥的自振特性、冲击系数、阻尼比进行了分析。

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。

A finite element model using the structural analysis software,SAP2000,was created to study the headframe's natural vibration characteristics and the state of member forces.

应用SAP2000有限元软件，建立三维有限元模型，对其自振特性和加固前后的杆件应力进行了对比分析，加固后杆件最大应力大大降低；通过加固前后不同荷载下的动力测试，对加固后井架的运行状况作出评估与分析，在原提升荷载和新提升荷载下，井架工作时平均振动频率都有很大幅度的减小。

Considering the effect of reinforcement, the method, which may be called the method of modal perturbation , is put forward.

提出了考虑纵向钢筋作用后梁自由振动分析的模态摄动法，通过实际算例，说明不同含钢率梁的自振特性的变化情况。

The free vibration characteristics were tested with the microseism method. The dynamic responses of strains, displacements and accelerations of the structure were tested under the dynamic loads of the train passing through the bridge with different uniform velocities and the train braking at a specifed point on the bridge with some requied velocities. The test results of the real bridge and the calculated results of the train-bridge coupling vibration were analyzed together.

采用脉动法测试其自振特性；动载试验中试验列车分别以不同速度匀速通过桥面及以一定速度在指定位置处制动，测试各工况下桥跨结构的应变、位移、加速度的时程响应，并将实桥测试结果与该桥的车桥耦合振动计算结果作比较分析。

In the natural sensitivity analysis to consider the impact of three different factors: the rotor moment of inertia, the water wheel attached to the moment of inertia and rotor arm stiffness.

在自振敏感性分析中考虑了三种不同影响因素：转子转动惯量、水体对转轮附加转动惯量和转子支臂刚度。

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。

Through the modal analysis, compares and sums up the change of the free vibration characters of the model under different belted outrigger plans.

对结构有限元模型进行模态分析，比较和总结了不同加强层设置方案下，结构自振特性的变化。

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 design model of self-resonating cavitating water jet nozzle is given based on organ pipe type .

在风琴管谐振腔模型的基础上，给出了自振空化喷嘴的设计模式。

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。