查询词典 flutter

This paper simulates how the additional flutter signal impacts on oil pressure and actuator output when the dead zone is kept. The proper principle of flutter signal for jam diagnosis is given. Based on the given flutter signal, different jams caused by jam of the EH servo valve under different operating condition are simulated and the output of the oil pressure and actuator are presented. Meanwhile, waving threshold of the oil pressure for jam diagnosis is given. The simulations and analysis prove that the jam fault identification of the EH servo valve based on flutter signal is feasible.

在应用附加振颤信号防止和识别卡涩故障的前提下，确定了振颤信号的选取原则，并采用仿真的方法深入探讨了3种变工况条件下不同卡涩程度对电液转换器油压和油动机输出的影响，提出了油压阈值的卡涩判断标准，论证了基于振颤信号幅值与频率响应监测电液转换器卡涩故障诊断方法的可行性。

Using the flutter model of two-dimensional wing with external store, the effects of pylon stiffness on the flutter speed and the evolution of wing store flutter modes with the variation of pylon stiffness are analysed.

以带外挂二元机翼为计算模型，分析了外挂联接刚度对颤振临界速度的影响以及机翼／外挂系统颤振模态随外挂联接刚度的演化。

Based on the flutter equation developed, the influences of mistuning level and distribution on the flutter characteristics of the assemblies are investigated in detail, and two criteria for distribution optimization are proposed. The influences of structural coupling on the effectiveness of mistuning on flutter control are studied.

根据建立的颤振方程，详细研究了失调分布对非谐调叶盘颤振特性的影响，给出了最优错频分布的两个准则，研究了结构耦合对错频抑制颤振效果的影响。

Results The detecting rates of the displacement of the mitral coaptation point ,the flail partial mitral leaflets,the coarse and erratic flutter of flail leaflets, the flicking mitral chordae tendineae with coarse and erratic flutter and the vegetation by TEE and TTE with 2-D were 100%and 94.3%, 100%and 65.7%, 85.7%and 54.3%, 77.1%and48.6%, 100%and33.3%, respectively.With color Doppler imaging,eccentric wall jets or eccentric-centric jets were all detected by TEE and TTE, respectively. The regurgitant volume based on PISA method by TEE and TTE was(2025±402)and (607±268)ml/min,respectively.

结果 TEE和TTE对二尖瓣腱索部分断裂的切面超声征象包括收缩期瓣缘对合不良、局部链枷运动、局部粗大扑动、腱索断端飞鞭运动伴粗大扑动及赘生物的检出率分别为100%和94.3%、 100%和65.7%、 85.7%和54.3%、 77.1%和48.6%及100%和33.3%； TEE和TTE二尖瓣腱索断裂的彩色多普勒表现为偏心附壁返流束或偏心伴向心返流束，其检出率均为100%；根据PISA法由TEE及TTE估测的返流量分别为(2025±402)及(607±268)ml/min。

Partial structure similarity model design concept is a better method for composite flutter model design, which can be applied to design transonic flutter model for aircraft wing and tail plane.

部分结构相似设计方法是一种较为实用的复合材料颤振模型设计方法，可用于飞机机翼、尾翼的跨声速颤振模型设计。

In the buckling question under nonconservation force,a simply example( the dynamic stability question under the uniformly follower forces with small deformation % linear elastic, straight normal.) is considered.The variational equation of braid composite cylindrical shells subjectd to uniformly follower forces is deduced based on the variation principle of quasinatural frequency of elastic nonconservative system self-excited vibration.The calculated formulas of the flutter load and quasinatural frequency of shells are obtained. The program for calculating the flutter load is developed.The numerical example is given and some useful conclusions are obtained.

对非保守力作用下的屈曲问题，具体研究了圆柱壳在比较简单的情况，即小变形、线弹性、直法线假设下在随动力作用下的壳屈曲问题，由拟固有频率变分原理推出了圆柱壳受随从力作用的变分方程，得到了颤振载荷与壳弯曲的固有频率的计算公式，编制了相应的计算机程序，并给出了具体算例，得到了一些有益的结论。

The transonic flutter characteristics are investigated for several wings, empennage and wing-body configuration, flutter critical speeds are numerically simulated.

以ONERA M6机翼和无后掠矩形机翼为算例，分别对它们的跨音速定常和非定常粘性绕流进行了数值模拟，计算结果和有关文献的结果进行了比较，吻合较好。

The results show that mistuning is always beneficial to alleviating flutter, that the alternative and the optimum distribution of mistuning have nearly same effects on alleviation flutter under intensive structural coupling and mistuning is limited in the improving of the stability of the system.

研究表明，错频对抑颤总是有利的，在较强的结构耦合作用下，交叉错频分布与最优错频分布具有相近的抑颤效果，且错频对提高系统的稳定性是有限的。

Bridge engineering ; central-slotted box girder ; wind tunnel test ; flutter performance ; CFD numerical simulation ; flutter control

桥梁工程；中央开槽箱梁；风洞试验；颤振性能； CFD数值模拟；颤振控制

Second, the dynamic design on CK1E pilotless aircraft flutter model and also that on J7E fighter plane flutter model are studied and fulfilled satisfactorily.

本文较系统地研究了工程中常遇到的几类链状结构的振动性能设计问题及CK1E和J7E两种飞机颤振模型的动态设计问题。

Fostering the concept of multi-culture firmly and mastering the development of advanced culture correctly are conductive to resisting terrorism, separatism of nationalities and ultraism of religion, which is of great academic theoretical, immediate and profound historical si...

牢固树立多元文化的理念和正确把握先进文化的发展方向，有助于在世界范围内自觉地抵制恐怖主义，民族分裂主义和宗教极端主义。不仅具有重大的学术理论意义，而且也具有重大的现实意义和深远的历史意义。

But if anyone walks in the night, he stumbles, because the light is not in him.

11：10 若在黑夜行走，就必碰跌，因为那光不在他里面。