According to the controlling requirement of megawatt wind driven generator with variablepropeller pitch of horizon axis, the hydraulic control system of a variablepropeller 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。
2
"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。
3
The research in this thesis is focused on the low harmonic variable-frequency power for the system meeting the needs of wind tunnel propeller model testing requirements.