"It's a variable-pitch propeller, which is like having gears on a bike," Land says.
“这是一个变距螺旋桨，就像在自行车上安齿轮一样，”兰德说。
In order to get a good performance on preventing cavitation, the impeller of magnetic driving pump is designed in low-NPSHR method and variable-pitch inducer is installed.
为了获得良好的抗汽蚀性能，对磁力泵叶轮采取低汽蚀余量设计措施，同时配置变螺距诱导轮。
In this paper, theoretical and experimental investigation on the newly developed equipment of renewable tidal-current energy spring-control vertical-axis variable-pitch turbine is presented.
本文着重阐述了一种新型的潮流发电装置——弹簧控角竖轴直叶水轮机的工作原理和试验研究过程。
To improve the efficiency of wind power utilization, we employ more and more variable-pitch controllers and variable-speed constant-frequency (VSCF) controllers in wind-power generating systems.
风力发电系统为了更充分更有效的利用风能，越来越多的采用变桨控制系统和变速恒频控制系统。
Once the program is loaded, only a few parameters are given, the development drawings of variable pitch helical blade will be obtained.
该程序一经调用，只要给出几个相关的参数，即可绘出变螺距螺旋面展开图。
The paper analyses the structural characteristic and work principle of screw with variable pitch, designed machining technics, put forward a particular method of nc programming.
文中分析了异型截面供送变螺距螺杆的结构特点和工作原理，设计了其加工工艺，提出了一套加工该螺杆的独特的数控编程方法。
Programming by the plane curve unwrapped from the helix curve and cutting layer by layer, we created the variable pitch screw on the 3.5 axis NC milling.
文章基于3.5轴数控铣床，利用螺旋线展开的平面曲线编程，分层切削，加工出变螺距螺纹；
In this paper, the mathematical model of DFIG and variable pitch system is established.
本文分别分析了双馈发电机和变桨距系统的数学模型。
With the theory of kinematics, the universal model of changed Angle and variable pitch spiral groove on any turning surface is researched.
本文应用运动学理论，研究了任意回转体外表面上的变倾角变导程螺旋线的通用模型。
First, wind turbine aerodynamics and variable pitch control process was discussed to provide theoretical studying basis for studying of the system design and control strategy.
首先对风力机空气动力学和变桨距控制过程进行了探讨，为系统的设计及控制策略的研究提供理论基础。
This provides a theoretical basis for latter variable pitch design of hardware and software.
这为后面的变桨距硬件和软件设计提供了理论依据。
The good or bad of variable pitch system affects wind generating set efficiency, safe operation and stable operation to a large extent.
变桨距系统的好坏很大程度地影响风力发电机组的效率、安全运行与稳定运行。
CNC lathe; variable pitch screw; NC Program; on the cutting point; graphic method;
数控车；变螺距螺杆；NC程序；起刀点；图解法；
In order to meet the constant power control requirements of wind turbines, the wind turbine model was linearized at the operation points, thus variable pitch PID control of wind turbines is achieved.
为了满足风力发电机的恒功率控制要求，对其模型在运行工作点处进行了线性化处理，从而实现了风力发电机变桨距的PID控制。
The torque control, pitch control and general wind turbine coordinate control strategy of variable speed adjustable pitch wind turbine were researched.
针对变速变距机组的转矩控制、桨距控制以及整机的协调控制进行了研究。
According to the controlling requirement of megawatt wind driven generator with variable propeller pitch of horizon axis, the hydraulic control system of a variable propeller pitch is designed.
针对兆瓦级水平轴变桨距风力发电机的控制要求，设计了变桨距液压控制系统。
So, variable structure control theory is used in Angle stabilization of roll, and model - following variable structure control theory is used in acceleration stabilization of pitch and yaw.
因此，本文采用了变结构控制理论设计倾斜角稳定系统，采用了模型跟踪变结构控制理论设计俯仰、偏航通道的加速度稳定回路。
MW variable speed constant frequency wind turbine from shenyang university of technology is a variable pitch wind turbine, it can change pitch to adjust power above rated wind speed.
由沈阳工业大学研制的MW级变速恒频风电机组属于变桨距型机组，它在额定风速以上进行变桨距调功控制。
Therefore, to carry out research on the variable pitch control system of wind turbine and its drive system has important significance.
因此，开展对风力机变桨距控制系统及其驱动系统的研究具有重要的意义。
Appropriate pitch curve designing is a key of regularly working for non-circular planetary gear mechanism with variable center distance which can be used in low speed high torque hydraulic motor.
合理的节曲线设计是可用于低速大扭矩液压马达的变中心距非圆行星齿轮机构正常工作的关键。
A helix equation of time-varying pitch is established, revolving elliptic cylinder as equal angular velocity and rising as variable velocity at the same time.
建立了绕椭圆柱面以等角速度旋转，又以变速度上升的非定常螺距的螺旋线方程。
With the stand-alone wind turbine capacity of large-scale, variable pitch control, a kind of wind power generation technology, is being more and more attention for its efficiency and practicality.
随着风力发电机组单机容量的大型化，变桨距控制风力发电技术因其高效性和实用性正受到越来越多的重视。
A simplified model of variable speed variable pitch wind turbine is established.
建立了变速变桨距风力发电机组的简化模型。
The simulation results indicate that wind turbine is operated at maximum power coefficient with variable-speed mode and the output power of generator is kept around rated power with pitch control.
数字仿真表明，在风速低于额定风速时变速运行捕获能量比恒速运行捕获能量大；节距调节控制可以很好地使输出功率稳定在额定功率左右。
Then the piecewise PID pitch-controlled algorithm and the control strategy for transition between variable speed constant frequency (VSCF) and pitch control were used in the test-bed.
在此试验台上对提出的分段PID变桨距控制算法以及变速恒频和变桨距切换设定的控制策略进行试验研究。
Special skill: assembly and commissioning of various fans, familiar with the assembly of hydraulic device, bearing housings and rotors of variable pitch axial flow fans.
擅长：种类风机装配、调试工作，精通动调风机液压调节装置，轴承箱及转子叶轮的装配、调试及故障排除。
The pump having the Angle adjustable vane is called the variable pitch vane type, and having the non-adjustable vane is called the fixed vane type.
循环水泵可分为拥有叶片角度调节装置的可调叶片式，和叶片不可调节的固定叶片式。
The pump having the Angle adjustable vane is called the variable pitch vane type, and having the non-adjustable vane is called the fixed vane type.
循环水泵可分为拥有叶片角度调节装置的可调叶片式，和叶片不可调节的固定叶片式。
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