热带海洋晴空发生强气流涡动的频率如何？
How often does severe clear air turbulence occur over tropical oceans?
在潮流基本方程中，水平涡动粘滞项也已考虑。
In the basic equations of tidal current horizontal eddy viscosity term is also considered.
因此，这种现象称为“油膜振荡”或“共振涡动。”
This phenomenon is therefore known as "oil whip" or "resonant whirl".
热量涡动输送也表现出与天气尺度波动活动量类似的特征。
The transient eddy heat flux show similar features of activity of synoptic-scale disturbance.
为减小涡动，转子径向采样周期应与转速相适应，不宜过快。
For reducing whirling the radial sampling period must be suitable to the rotor speed not excessively short.
PD C钻头的涡动是影响其使用寿命和效果的主要原因之一。
The whirling is one of the main reasons of decreasing the life and the useful effect of PDC bits.
海滨地区广泛存在涡动沙纹，它很大程度上决定着波浪衰减和泥沙运动。
Vortex ripples widely exist in coastal area and greatly control the attenuation of wave and movement of sediment.
随转速的增加，钻柱的横向运动逐渐由规则摆动向无规则摆动和规则反向涡动转化。
With the increase in rotary speed, the motion state of drill string will be successively transformed from regular swaying into irregular swaying and regular whirling.
钻压和转速是影响钻柱运动状态的两个主要因素，转速越高，越容易形成规则涡动；
The weight on bit and rotary speed are the main factors affecting the motion behavior of drill string. The higher the rotary speed is, the more easily the regular whirling will be formed.
分析了裂纹转子在非线性涡动影响下的动力学行为，特别是系统响应的分叉与混沌特性。
A cracked rotor with nonlinear influences of whirl speed is investigated, with particular focus on the behaviors of bifurcation and chaos.
采用裂纹深度修正的非线性开闭裂纹模型，研究涡动影响下挠性裂纹转子的动力学行为。
A nonlinear crack modal, modified by the crack depth, is used to study a cracked rotor with the influences of whirl speed.
对9f单轴式燃机发生在可倾瓦轴承上的油膜涡动和油膜振荡进行了介绍、分析和诊断。
This paper describes, analyses and diagnoses the oil whirl and whip faults in the tilting pad bearings of the 9f type gas generator set of single shaft.
分析了转子轴承系统中流体动态力的形成和自激振动的产生与油膜涡动、油膜振荡的故障。
The formation of fluid dynamic force and the occurrence of self-excited vibration and oil film vortex of rotor system are analyzed.
此外，所有这些涡动的电子并不能解释为什么某种神经构造造成了我们看到了蓝色而不是红色。
Furthermore, all the whirling electrons cannot explain why a certain neuronal configuration results in our seeing blue rather than red.
认为突发性振动原因是运行中转子的油膜涡动和匝间短路、线圈膨胀受阻等引起的热不平衡。
It is concluded that the causes of sudden vibration are oil film whirl and thermal unbalance of generator rotor resulting from interturn short-circuit and hindered winding expansion etc.
涡动又称甩转，是旋转轴发生的一种自激振动，它既不具有自由振动的特征，也不属受迫振动的类型。
Vortex also called left turn, is the axis of rotation happened a self-excited vibration, it is neither has the free vibration characteristics, also do not belong to the type of forced vibration.
用本文提出的方法，不仅可以求得系统的固有频率、振型、动态响应，还可以模拟轴上各点的涡动轨迹。
Using this method not only the natural frequencies, mode shapes, dynamic responses but also the whirl orbits of the rotor system can be obtained.
实践表明，全矢能量谱作为对转子涡动信号处理的能量分析方法，对于旋转机械故障诊断是非常实用的分析工具。
It has been shown that the full vector energy spectrums are a very practical analysis tool to fault diagnosis of rotary machinery as a energy analysis method to process whirl signal of rotors.
为研究转子 轴承系统中非线性油膜力引起的半速涡动 ，本文给出了将吴文俊消去法和符号计算相结合的分析方法。
In order to study half-speed whirl that is subjected to nonlinear oil force of rotor-bearing system, the Wu Elimination method and symbolic calculation method are combined in this paper.
导出了二维浅水流动的涡动方程与速度环量的随体导数表达式，以此为基础，分析了二维浅水流动中旋涡的动力学性质；
The vorticity equation was first established and the characteristics of vortex motion in two-dimensional shallow-water flows was analyzed, and then discrete vortex method (DVM) was briefly described.
结果表明，油膜涡动角度的变化对三油楔固定瓦滑动轴承的静、动特性和稳定性将产生很大的影响，且这种影响随油膜涡动半径增大而增大。
The results show that the change of oil-film whirl angle makes the characteristics of journal bearing change greatly, and the more the whirl radius is, the more the influence is.
通过分析和讨论阻塞形成、维持和衰亡过程中低频涡动和高频涡动的矢量型以及高频涡动对阻塞流型的强迫作用，得到了若干有意义的结果。
The vorticity flux divergence of the high frequency eddies in the maintenance of the blocking is also discussed. Some useful results are thus acquired.
通过对浮环减薄前后实验结果的对比分析，研究了浮环厚度变化对浮环轴承涡动及稳定性的影响，并给出了三维谱图、涡动比与转速图、典型分岔图。
Based on two experiments on floating ring bearing before and after floating ring thickness reduction, the effect of thickness variation of floating ring on whirl and stability was studied.
VMM允许使用者评估井下钻进的振动剧烈程度，以此来提高钻进效率，还能警告作业者注意振动状况，包括粘卡及涡动等可能损坏MWD和其它井下仪器的现象。
VMM allows users to assess the severity of downhole drilling to improve drilling efficiency and alert them to vibration conditions that could damage MWD and other downhole tools.
本文对动失速型非定常分离涡结构的控制方法，在低速风洞中应用相平均测压技术进行了实验研究。
Experimental investigation on the control of dynamic stall type vortex flow was made in a low speed wind tunnel by using phase averaged pressure measurement technique.
模型中通过“狭槽法”来处理波浪在岸线处的动边界条件，采用涡粘模型来模拟波浪破碎引起的能量耗散。
In the numerical model a 'narrow slot 'method is adopted to simulate mobile shore line and an eddy viscosity method to simulate wave breaking.
动叶尾迹强度明显减弱，叶背流动分离得到抑制，叶尖泄漏涡也得到了周期性的抑制。
The intensity of rotor wakes was reduced, flow separation on rotor suction side was suppressed and the tip leakage flow was suppressed periodically.
本文以拉格朗日方式研究叶轮机内动、静叶间的相互作用，通过直接跟踪流体涡团的时间历程，来描述流体的非定常流动过程。
The Lagrangian vortex method is applied to direct description of the unsteady flow due to rotor-stator interaction in turbomachinery by tracing the trajectory of vortices.
采用离散涡方法数值仿真了不同来流攻角下，固定与动边界叶栅绕流。在设计工况时流动接近定常流动。
The unsteady flow past stationary and oscillating cascade for off-design performance respectively are simulated numerically with the Discrete Vortex Method.
采用离散涡方法数值仿真了不同来流攻角下，固定与动边界叶栅绕流。在设计工况时流动接近定常流动。
The unsteady flow past stationary and oscillating cascade for off-design performance respectively are simulated numerically with the Discrete Vortex Method.
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