Precise pitch control is essential for both wind turbine efficiency and safety. In essence, it is the process of adjusting the blade angle to manage wind energy capture and rotational speed. By primarily manipulating the pitch angle, the system achieves three critical functions:

• Maximizing Power Generation Efficiency: At low wind speeds, the system adjusts the blades to an optimal position (close to 0°) to capture the maximum amount of wind energy.

• Limiting Turbine Speed: When wind speeds exceed safe levels, the system increases the blade pitch angle. As a direct consequence, this reduces the wind-facing area, preventing component damage from excessive rotational speed.

• Enabling Emergency Shutdown: In extreme weather or during equipment failures, the system rapidly feathers the blades to a 90° angle. This causes the turbine to quickly stop rotating, thereby ensuring the equipment’s safety.

To rigorously validate these functions, the SINOTEST Pitch Mechanical Testing Rig employs advanced electro-hydraulic servo loading technology. Moreover, by combining a high-frequency response actuator system with a sophisticated controller, the rig can perform a variety of tests, including linear loading, planar loading, and torque loading evaluations on pitch bearings.