该词条未找到_海词词典

您要查找的是不是：

The flutter derivatives of the girder were identified by Weighting Ensemble Least-Square method (WELS). 分析表明：天兴州公铁两用大桥主梁断面具备气动稳定的必要条件；
Environment excitation-based methods are effective ones to identify flutter derivatives of bridges in turbulent wind field. 基于环境激励的模态参数识别方法是解决紊流风场中桥梁结构气动导数识别问题的一种有效途径。
The identification of flutter derivatives for bridge sectional model has long been a key issue in long-span bridge flutter and buffeting analysis. 桥梁断面颤振导数识别问题可转化为最小二乘优化问题,提出了梯度下降算法求解该优化问题,提取桥梁主梁断面18个颤振导数。
Scanlan, R.H., and Tomko, J.J., (1971) “Airfoil and bridge deck flutter derivatives,” Journal of the Engineering Mechanics Division, ASCE, 97(EM6), 1717-1737. 姚忠达、杨永斌，(2000)，高速铁路车-桥互制理论，图文技术服务有限公司。
Three examples are used to examine the performance of TMDs, the first two are a simple-supported beam with different flutter derivatives and the third is a cable- stayed bridge. 本文中采用了简支梁例题一、例题二与斜张桥例题，当考虑振态耦合与无耦合两种情况时，在不同模型时设置TMD桥梁制振折减率的比较。在垂直向TMD制振效果并无明显差别；
The aerodynamic parameters, which are static aerodynamic coefficients of the girder and of the train and the flutter derivatives of the girder of Tianxingzhou highway-railway bridge, were obtained. 分析上、下游不同方向来流，桥上有无列车，列车不同位置和不同队列数等对桁梁和列车三分力系数的影响。
Mother is all of a flutter because of thunder and lightning. 由于电闪雷鸣，妈妈感到十分不安。
An organic derivative, such as coal or petroleum. 有机衍生物一种有机衍生物，如煤或石油
flutter derivative 气动导数
They unfurled the flag and let it flutter in the wind. 他们将旗展开让其迎风招展。
That TV play caused a mild flutter among the viewers. 那出电视剧在观众中稍稍引起轰动。
There was a flutter of wings among the trees. 树林里响起一阵飞鸟的拍翅声。
An acyl derivative of hydrazine. 酰肼一种由肼衍生而来的酰
He immediately fell into a great flutter. 他立刻变得心慌意乱。
A fourth model may be tested for flutter speed. 第四个模型可用来进行颤振试验。
A mark used as a superscript to indicate the first derivative of a variable. 撇号置于右上角的符号，用以标明变量的第一个导数
The news caused a flutter among the teaching staff. 这个消息在全体教师中引起了不安。
The derivative of the step is the impulse. 阶梯的导数就是脉冲。
His arrival put the girls in a flutter. 他的到来使她心绪不宁。
A derivative is defined by a limiting process. 导数是通过一个极限过程加以规定的。