selectifier (screen))))是什么意思

用法例句

Helicopter rotor smoothing based on GRNN neural network and genetic algorithm;

基于GRNN网络和遗传算法的旋翼动平衡调整

Study of aerodynamic model for the maneuvering rotor;

适合机动飞行的旋翼气动模型研究

Experiments of rotor wake distortion in pitching maneuvers;

机动飞行中旋翼尾迹畸变效应实验

Euler solutions of transonic flow for a helicopter rotor in hover using multigrid method;

用多重网格方法计算旋翼跨声速无粘流场

Numerical simulation of the viscous flow past a helicopter rotor in forward flight using newton-like sub-iterations;

用Newton子迭代方法计算前飞旋翼粘性绕流

The flow field of the helicopter rotor is characterized by unsteady phenomena.

旋翼的流场呈现很强的非定常现象。

In the coordinate system rotating with the blade, a free wake model for hovering rotors using an iterative procedure and the curved vortex element on the circular arc is established and checked by the comparisons with experimental data on the tip vortex path and blade bound circulation for two different model rotors.

在随桨叶旋转的坐标系中，建立了悬停旋翼自由尾迹计算的迭代方法和模型。

In the method ,the blades are treated as rigid ones with offset and spring restrained hinges and with structural coupling between flap and lead lag motion for the purpose of being applicable to hingeless or starflex rotors.

采用带外伸量及弹性约束的当量铰桨叶模型，考虑了旋翼挥／摆结构耦合及动力入流非定常气动力，建立了悬停状态旋翼／机体耦合动稳定性分析方法，适用于星形柔性及无铰式等旋翼系统。

A computational method based on rotor free-wake is developed for predictig flow field between the twin rotors of coaxial helicopters.

建立了一个适合于共轴式直升机双旋翼流场特性分析的自由尾迹计算方法。

A high strength epoxy matrix and composite cured at moderate temperature for the composite rotor blades of helicopter has been inves-tigated furthermore by using tests of general mechanical properties, nine engineering constants were obtained.

本文对曾用于直升机复合材料旋翼桨叶的高强度环氧树脂基体及其复合材料性能进行了深入的研究工作。

This paper presents the results of a survey of rotor blades optimum design of reducing vibration by modifying blade properties so as to reduce vibratory hub shears and moments, and thereby reduce the vibration level experienced in the fuselage.

围绕降低直升机振动水平的旋翼桨叶减振优化设计 ,对国内外这方面研究进展情况作了综述 ;着重讨论了降低旋翼激振力减振优化设计分析中的几个主要问题 ,包括桨叶减振优化设计途径与目标 ,桨叶优化设计中的分析模型 ,优化设计方法及灵敏度分析技术 ,以及桨叶优化减振设计研究的最新发展方向和需进一步研究的问题等 。

A design oriented method for the dynamic design optimization of composite rotor blades is presented.

提出一种面向设计的复合材料旋翼桨叶结构动力优化方法。