Period characteristics of radiated noise at high frequency is investigated by a method based on short time Fast Fourier Transformation, and propeller speed is estimated.

用短时傅立叶分析的方法研究了辐射噪声在高频段时频变化的周期性，估计了目标的螺旋桨转速。

The Sikorsky X2 has a pusher propeller mounted at the rear to obtain its high forward speed.

美国西科斯基公司的X2拥有一部安装在后方的推进螺旋桨，这使它获得高速的前飞速度。

Instead, slight speed variations on each propeller perform that function automatically.

取而代之的是，它能自动调整使每个螺旋桨以稍有差异的速度运转。

In order to satisfy the operation requirement of the rated thrust of the propeller, the propulsion motor performs only in rated torque on the low speed, so the motor power is low.

认为以满足螺旋桨额定推力为目的，推进电动机只需要低速输出额定转矩来实现，即输出功率较低。

Also let us adjust the size or pitch of the screw propeller, then try to get high-speed running.

也让我们调整大小或摊位的螺旋桨，然后尝试获得高速运行。

The vessel is to be single fixed pitch propeller propulsion with one (1) low speed diesel engine located aft.

本船推进系统由1 台位于艉部机舱内的低速柴油机和一个定距螺旋桨以及轴系组成。

Propeller slip calculator for powerboats Please use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip.

机动船的螺旋桨滑计算器请使用这个计算器计算出所有参数间距，齿轮比，转速，速度和防滑方面。

When the power required by propeller is so high that the shaft speed cann't arrive a rated value, the tip of propeller can be cut to decrease its load.

当螺旋桨要求的功率过高以至于轴转速达不到额定值时，可以采用切割螺旋桨叶梢的方法减小螺旋桨的负荷。

The advantage of the ducted propeller is, this type propeller can support greater thrust and higher efficiency under low speed, so is the first choice.

导管螺旋桨优势在于低航速时提供更大的推力和更高的推进效率，因此作为首要选择。

This paper concisely describes the selection of propeller type and interaction coefficients for high speed, and gives the application of some diagrams and empirical formulas.

本文扼要地介绍了高速船螺旋桨设计中碰到的螺旋桨选型问题、相互作用系数选取问题以及某些图谱和经验公式的应用。

The top speed of the plane will actually increase because of the the propeller working more efficiently.

飞机的最高速度实际上增加了，因为工作更有效地推进。

The system operates by a lever (28) which controls a pitch control unit (10) which in turn controls engine speed and also the pitch of propeller blades (12) of propeller (14).

系统通过控制螺距控制单元(10)的杆(28)操作，螺距控制单元依次控制引擎速度和螺旋桨(14)的螺旋桨叶片(12)的螺距。

The interaction noise induced by propeller has constituted the main part of the noise radiated from the medium-speed or high-speed marines.

由螺旋桨引起的互作用噪声构成了船舶中高速航行时整个辐射噪声的重要部分。

Therefore, it is recommended to adopt the two-step change-speed propeller in the tug design.

建议在多工况船的螺旋桨设计中采用二档变转速推进方式。

A propeller, in order to operate efficiently, must rotate at a relatively speed. A. high B. low C. fast d.

lowly答案b螺旋桨，为了更有效率的工作，必须以相对较低的速度旋转。

In general, the speed depends on material hardness of the wear and tear, salaries rod density, the operator of the machine operating proficiency and propeller repair welding alloy used in the quality.

一般说来，磨损快慢取决于原料的硬度、薪棒的密度、操作人员对机器的操作熟练程度及修复推进器所使用的合金焊条质量。

Among commonly used types are those employing either a propeller or cups for measuring wind speed and a vane for measuring wind direction.

普通使用的型式是测量风速的叶扇或风杯及测量风向的风标。

Modern horizontal axis wind turbines of the "high-speed" type, as used in large scale power generation, typically include two or three propeller-style blades with a diameter of 100 meters or more.

“高速”型的现代水平轴风力涡轮机，如用于大规模发电的那种，一般包括两个或三个直径为100米或更大的螺旋桨式叶片。

Rotation speed control unit is an important part of underwater heat power propeller system, it directly effects performance of power propeller system.

转速控制单元是水下热动力推进系统的重要组成部分，其直接影响着动力推进系统的性能。

The propelling plant consists of a slow speed, reversible diesel engine driving a fixed pitch propeller through a forged steel shafting.

驱动装置包括由1台低速、可逆柴油发动机通过锻钢材料的轴系驱动1只定距桨。