本文的目的在于说明提高旧船螺旋桨转速所用的一些实用方法。
This paper describes some practical methods used to increase propeller revolutions in aged ships.
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。
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.
通过DEMON分析可以获得诸如舰船螺旋桨转速、螺旋桨叶片甚至舰船的车数等不变的舰船物理特征。
Many invariable physical features can be obtained with DEMON analysis such as revolution rate of propeller, the propeller vane, and the number of propellers.
立方直升机的这种配置让他可以像直升机一样盘旋，但在向前飞行时，主旋翼的转速可以将下来，让两侧的机翼提供升力，在此情况下，两台螺旋桨推进器就能发挥大作用了。
This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift. Its propellers give the extra oomph.
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。
Therefore, it is recommended to adopt the two-step change-speed propeller in the tug design.
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。
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.
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。
Propeller slip calculator for powerboats Please use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip.
反向旋转双螺旋桨搅拌器迅速的搅拌作用和各种转速能快速使蒸汽和奶酪颗粒融合。
The blending action and variable RPM of the counter-rotating twin agitators quickly "fuse" the steam and cheese particles together.
反向旋转双螺旋桨搅拌器迅速的搅拌作用和各种转速能快速使蒸汽和奶酪颗粒融合。
The blending action and variable RPM of the counter-rotating twin agitators quickly "fuse" the steam and cheese particles together.
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