Vibration Damping for Wind Turbine Noise Control

Wind turbine blade vibration reduction device to suppress blade vibrations and prevent aeroelastic instability in large wind turbine blades. The device involves a series of vibration damping units arranged inside the blade between the webs. Each unit has two impact dampers in separate cavities separated by partitions. The dampers contain pendulum balls connected by springs and ropes to the blade webs and cavities. The pendulum balls collide as the blade oscillates, dissipating energy and reducing amplitude. Rubber pads isolate the dampers from the blade shell. The one-way energy dissipation device minimizes blade deformation, extends blade life, and prevents instability.

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A resonance control device for wind turbines to reduce vibrations and noise. It consists of a housing with sound-absorbing material, a vibration sensor, and a rotating block. The vibration sensor detects turbine vibrations and transmits the signal to a steering gear. This gear adjusts the fan blade angle to counteract the vibrations and prevent resonance. The rotating block allows the sensor and gear to rotate with the turbine. The housing absorbs noise from the turbine. This setup reduces vibrations and noise by actively mitigating resonance.

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Passive aerodynamic damping structure for wind turbine blades to suppress blade vibrations under unstable airflow conditions. The damping structure has lobes and a rotary mechanism mounted at the blade tip. The lobes are eccentrically positioned around the rotary mechanism's axis. This offset creates a lever arm that activates the lobes when the blade vibrates. The lobes generate aerodynamic forces that dampen the vibrations. The lobes are positioned near the blade's aerodynamic center to maximize damping effect. The rotary mechanism allows blade rotation under stable airflow.

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Vibration damping system for wind turbines that improves damping capacity as wind direction and force change during operation. The system uses adjustable damping units with movable rings that cooperate to generate resistance to damp vibrations. This provides better damping compared to fixed dampers as the movable rings can adapt to different vibration frequencies and amplitudes caused by changing wind conditions.

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Vibration absorber for generator stators to reduce vibrations in large turbine generators. The absorber uses the principle of a dynamic vibration absorber. It attaches to the generator stator housing and has a support base, vibration absorbing elastic plates, a counterweight cavity, and a counterweight block. The absorber has the same natural frequency as the generator to effectively reduce stator vibrations.

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Real-time vibration control system for wind turbines that can actively and accurately mitigate turbine vibrations during operation. The system uses a movable mass block on the tower that can be adjusted by a controller to change the overall mass distribution of the turbine. By moving the mass block to positions with maximum vibration displacement, the natural frequency of the turbine can be altered in real time to break away from resonance frequencies. This allows the turbine to operate farther from vibration frequencies caused by wind load, preventing resonance and reducing overall vibration amplitudes.

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Vibration and noise reduction device for wind turbines that mitigates the high-frequency vibrations and noise generated by wind turbine generators. It uses a base in the nacelle, a damping chamber filled with non-Newtonian fluid, a sliding linkage connecting to the turbine, and an elastic component between the linkage and base. The fluid-filled chamber and elastic component absorb and dissipate vibrations and noise from the turbine to reduce transmission to other equipment in the nacelle.

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A composite multi-system wind turbine vibration reduction and load reduction mechanism that aims to mitigate vibrations and loads in wind turbines without external energy. The mechanism uses a passive vibration control system that can be integrated into the wind turbine structure. It consists of a composite multi-system that includes a yaw system, a gear system, and a fluid system. The yaw system has wheels and a connecting rod that connects to the gear system. The gear system has a pair of gears with teeth that engage. The fluid system has a tank with liquid that sloshes when the turbine vibrates. The composite multi-system is tuned to the turbine's vibration frequencies. When the turbine vibrates, the fluid sloshing absorbs energy, the gears transmit forces, and the wheels rotate to dampen the vibrations.

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A wind turbine vibration damping device using non-Newtonian fluid to reduce vibrations in wind turbines. The device consists of a base, shell, elastic component, and a non-Newtonian fluid damping assembly. The shell slides on the base, with the turbine mounted on it. The elastic component connects the base and shell. The non-Newtonian fluid damping assembly is between the shell and turbine. This configuration uses the unique properties of non-Newtonian fluids to dampen vibrations when the turbine is operating. The non-Newtonian fluid resists deformation when forces are applied, which helps absorb and dissipate vibrations. The device allows the turbine to slide on the shell, reducing fixed-point vibrations. The elastic component provides compression, and the non-Newtonian fluid damping assembly absorbs and reduces vibrations further.

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Large wind turbine blade vibration damping system using spherical liquid masses inside the blades to reduce blade vibrations and prevent damage. The system has multiple spherical liquid masses connected in series inside the blade. Each mass is a hollow sphere with a sealed hemisphere, a tuning liquid, partition plate, disc-shaped steel plate, springs, limiting devices, and friction pads. The disc-shaped steel plate can rotate freely around a ball joint. When the blade vibrates, the sloshing liquid creates forces to counteract the vibrations. The disc rotation is limited, springs dampen motion, and friction pads increase energy dissipation.

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Device and method to mitigate blade vibrations in wind turbines during stationary periods like installation or shutdown. The device is a removable flexible sleeve that wraps around part of the blade and attaches near the leading edge. It has airflow altering elements like dimples filled with material. This modifies airflow around the blade to reduce vibrations compared to normal operation. The removable attachment near the leading edge allows easy removal after installation.

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Compact damping device with integrated frequency adjustment for vibration control in structures like wind turbine towers. The device has a base with an internal cavity containing an elastic member and a damping component. A connector extends from the base into the cavity and can move relative to the base. The elastic member attaches to the connector and base, adjusting frequency. The damping component is connected to the connector and base, absorbing vibration energy. This integrated design avoids separate frequency and damping components scattered in the structure.

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Controlling airborne tonal noise generated by wind turbine components like gearboxes by optimizing vibration control systems. The method involves selectively activating vibration control actuators based on wind turbine operating conditions to reduce component vibrations and tonal noise. This prevents unnecessary actuator usage and energy consumption for vibrations that don't lead to tonal noise. It also avoids situations where actuator oscillations reduce vibrations but increase tonal noise. The actuator selection and amplitude are adjusted based on machine learning or manual calibration to find the optimal trade-off between vibration reduction and tonal noise suppression.

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Adjustable angle tuned mass damper for wind turbine blades to reduce vibrations and prevent blade failure. The damper is mounted inside the blade and can be adjusted to match the blade's natural frequency. It consists of a mass module, spring damping system, and guide system. The mass module can be customized with multiple mass blocks to find the blade's frequency. The spring damping system converts blade vibration energy into internal energy. The guide system allows angular adjustment to optimize damping.

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A blade damping device for wind turbines that reduces blade vibrations without changing the aerodynamic profile. The damping device is installed inside the blade cavity and consists of a tuned mass damper (TMD) with a gear reduction mechanism. The TMD has a mass block that slides along rails, connected to a spring and deceleration mechanism. A gear system with a fixed large gear and a smaller gear provides reduction. This allows the spring static displacement to be reduced compared to traditional TMDs, preventing collisions and excessive stroke limitations. The reduced displacement and spring length improves fit in the narrow blade cavity. A magnetic steel in the TMD can have magnetic fields cut by a conductor plate to dampen vibrations. The gear reduction and inertial mass amplification reduce the required blade cavity space for the TMD while still effectively damping blade vibrations.

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Using tuned mass dampers to reduce fatigue in wind turbine nacelles by targeting low frequency vibrations below 50 Hz. The dampers are attached to the nacelle structure and tuned to specific motion modes in this frequency range. They absorb and dissipate the energy of those vibrations to reduce nacelle displacement and fatigue compared to just adding reinforcement. This addresses life-shortening periodic vibrations caused by external loads like wind, closing events, and seismic events.

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Vibration damping device for wind turbine generators to mitigate vibrations and reduce damage to other components like gearboxes. The device consists of a damping box with a top cover attached to the generator. Below the cover, a vibration damping assembly with a spring and a shock absorber block is sandwiched between the box and the limiting groove. The shock absorber block has fan-shaped grooves in its side walls to further dampen vibrations. This setup allows vibrations from the generator to be transmitted through the top cover to the spring and shock absorber block, weakening them before reaching the gearbox.

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Device and method to reduce vibrations in wind turbine blades, particularly when the turbine is parked or stopped. The device wraps around a wind turbine blade and provides clearance between the blade surface and a baffle. This modifies airflow around the blade to mitigate vortex and stall-induced vibrations. The device has supports at the proximal and distal ends of the blade to provide stiffness. It can be easily installed and removed using cords attached to the proximal support.

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Vibration and noise reduction device for wind turbine generators to mitigate vibrations and noise from the high-speed rotating generator. The device consists of a base, a sliding shell around the generator, a vibration damping assembly between the base and shell, and a sound insulation assembly between the base and nacelle or shell and generator. This isolates the generator vibrations and noise from the turbine structure, reducing vibrations and noise transmission.

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Tower vibration reduction system for wind turbines to mitigate excessive tower vibrations caused by increasing blade lengths and heights. The system uses a passive damping device attached to the tower. The device has a mass block suspended by flexible cables between the tower top and bottom. When the tower vibrates, the mass block moves and the cables generate a restoring force to dampen the vibrations. The device passively resonates with the tower vibrations to absorb and dissipate energy, reducing tower vibrations.

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