针对螺旋桨叶片数识别问题，建立了螺旋桨空化噪声信号模型。
In order to solve the problem of propelle blade-number recognition, the propelle radiated-noise model is built on the basis of five hypotheses.
通过正交试验研究了磨削参数对船用螺旋桨叶片表面粗糙度的影响。
The effects of grinding parameters on surface roughness of Marine propeller blade were studied by using orthogonal test.
利用螺旋的升力线模型和变分法原理对螺旋桨叶片环量分布进行了数值优化。
The optimum distribution of circulation on a marine propeller blade is numerically determined by using the lift_line vortex model and variational calculus.
麻烦的是，高海拔的地段，氧气稀薄，螺旋桨叶片没有空气使其扇动，而且发动机燃烧汽油也需要氧气。
The trouble was that at high altitudes where there is less oxygen, the propeller blades had little air to bite and engines still needed oxygen to burn petrol.
NTSB发现机组人员都已无法感知飞机的任何问题，直到螺旋桨叶片角度为24度和26度之间。
The NTSB found that the flight crew would have been unable to perceive any problem with the airplane until the propeller blade Angle was between 24 and 26 degrees.
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.
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 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 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).
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