螺旋桨

Due to the presence of Coriolis forces in the rotating coordinates, the gyroscopic term is introduced into the dynamic equations.

工程中存在有大量的旋转结构部件，如汽轮机、航空发动机的转子系统或螺旋桨以及直升机旋翼等。

The surface of propeller blades and hub is discreted by a number of small hyperboloidal quadrilateral panels with constant source and doublet distribution.

本文建立了扰动速度势面元法预报螺旋桨表面非定常压力分布的理论和数值方法。

Vortex lattice method is presented for calculating the loading distributions on all blades of propeller and hub which a number of small hyperboloidal quadrilateral panels are discreted.

螺旋桨采用离散涡环法，将桨叶表面和桨毂表面离散为一系列双曲四边形，在四边形网格中布置集中涡环和线源分布，根据物面条件建立方程得到涡和源汇分布的强度。

It constructed the math model of the ship shafting transversevibration and the lubricative capability calculation of stern tubebearing.

2应用传递矩阵法，研究了以螺旋桨流体激振力为激振源的轴系横向振动模型，求出其在尾轴承处的振动响应特性。

The propulsion shafting is subjected to the various dynamic factors when it is running, including hydro-oscillation force, ship hull'distortion, lubricative oil force and so on.

船舶在运行过程中，推进轴系会受到螺旋桨水动力、船体变形、润滑油膜等各种动态因素的影响。

This thesis tried to connect the dynamic factor of the propellerhydro-oscillation force and the lubricative state of it to analyzeand calculate the lubricative characteristics of it with manyvariables, and them to explore a feasible way for the lubricativecharacteristics calculation of it, reckoning the propellerhydro-oscillation force in and put up a flat roof for reckoning alldynamic factor in future.

具体而言，本文主要包括以下几方面的主要内容：(1)分别构建了船舶轴系横向振动和船舶尾管轴承润滑性能计算的数学模型。这是论文进行计入螺旋桨流体激振力的船尾轴承润滑特性计算的理论依据。

For the next 45 minutes the propellers will blend the oil and methoxide, sustaining a reaction.

在接下来的45分钟的螺旋桨将混合油和甲醇，维持一个反应。

They heard the rotors of helicopters before they saw them, and Nikolai's reaction was instantaneous.

他们听见了直升机的螺旋桨声，尼可莱立刻作出了反应。

Moreover, combining with dynamic trajectory simulation of different kinds of aircraft with atmosphere perturbance models, a software package of radar signatures prediction and analysis is presented.

二、分析了活动部件周期调制特征产生机理和频谱结构特点，并通过建立通用仿真模型描述直升机旋翼，螺旋桨以及喷气引擎压缩叶片的动态电磁散射现象；针对活动部件周期调制，阐述了自相关特征提取和子波包特征空间变换的基本原理；并利用模糊模式比较完成基于空中目标活动部件周期调制特征的分类识别试验，给出识别结果。

An unsteady BEM is used to calculate unsteady hydrodynamic performance of the podded propeller. The interactions between the propeller and the pod are treated by two iterative calculation methods: induced velocity and induced velocity potential.

为了计算吊舱推进器的非定常水动力性能，建立了用诱导速度势处理吊舱和螺旋桨非定常相互干扰的方法，并和用诱导速度处理两者相互干扰的方法作了对比分析。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。