46results about How to "Avoid electrical hazards" patented technology

This invention discloses a pneumatic pitch drive system and method for an underwater semi-active flapping fin power generation device, belonging to the field of fluid energy conversion technology. The system includes a mounting frame, an air supply module, and a motion module. The motion module includes flapping fins and a pitch drive assembly, which comprises dual pneumatic chambers, a piston-rack assembly, gears, and an angle detection element. The air supply module is separate from the motion module and includes an air source and valve group for independently controlling the air supply and exhaust of the dual pneumatic chambers. The controller adjusts the pressure difference between the two chambers according to the deviation between the actual pitch angle and the target pitch angle, driving the piston-rack assembly to reciprocate, and driving the flapping fins to pitch motion via the gears, forming a closed-loop control. This invention reduces the use of underwater electrical components, lowers the risk of seal failure and corrosion, and overcomes the response lag and motion overshoot problems caused by the compressibility of gas through closed-loop control, improving the stability of pitch control and energy harvesting efficiency.