Acoustic Blade Materials for Wind Turbines

Flexible wind turbine blade with noise reduction to mitigate the noise generated by long, large blades. The blade has a noise reduction component that can be inserted into a slot on the blade connection plate. This component connects to the blade through a mechanism that allows it to slide into the slot. The component has saw teeth on one side that engage slots in the blade connection plate to hold it in place. Springs and blocks connect the component to the blade and provide compression force. This allows the noise reduction component to be easily installed and removed from the blade for maintenance. The component inside the blade helps reduce noise by dampening vibrations.

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A multi-axis wind turbine with integrated noise reduction that can capture and convert wind power while also significantly reducing the noise produced. The turbine has interconnected vertical blades that rotate around a central shaft. Above the blades is a chamber with sound absorption materials. When the blades spin, they transport noise into the chamber where it is absorbed. This allows the turbine to continue operating and generating power even when there is no wind, as it can release stored electrical energy. The interconnected blades allow for multi-axis rotation and wind capture compared to conventional horizontal axis turbines. The noise reduction chamber provides systematic noise management and reduction compared to traditional sound barriers.

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Wind turbine blade noise reduction device that significantly reduces wind turbine blade noise compared to conventional noise reduction methods. The device has a wind turbine blade noise reduction body with a first noise reduction component on one side and a second noise reduction component on the other side. The first component has an inner blade, an air knife, an upper flow hole, and a lower flow hole. The air knife is fixed to the inner blade. The upper flow hole is at the top of the air knife and the lower flow hole is at the bottom. This disperses the airflow around the inner blade to reduce noise. The second component has a damping component attached to the end to further reduce vibrations and noise.

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An eco-friendly hybrid coating system for wind turbine blades that reduces noise and prevents corrosion. The coating has two layers: a sound-absorbing layer to reduce noise and an anti-corrosion layer to protect against environmental damage. The layers are strategically arranged and thickened to enhance absorption and corrosion resistance. The coating materials are chosen and the layer thicknesses optimized through experiments or modeling to balance noise reduction and corrosion prevention.

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A wind turbine blade with rapid noise reduction by using internal and external noise reduction components attached to the blade. The blade has a mounting plate on one side connected to the fan and a hub on the other side. Inside the blade near the hub is a fixed tooth-shaped component with an air guide groove in its outer surface. The tooth component has a base layer fixed to the blade outer surface and a sound-absorbing layer on the base layer outer surface. A smooth layer covers the sound-absorbing layer outer surface. Near the hub, there is also a fixed mounting block with a threaded fixing groove. Inside the hub, there is a threaded mounting hole and bolts to connect the mounting block and hub. This internal noise reduction component reduces blade vibration noise. Externally, the blade has a tooth-shaped component with an air guide groove on its outer surface. This external component reduces wind

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Reducing noise from wind turbines by adding a dorsal fin-like structure at the blade tips. The fin extends vertically from the blade tip and has a curved shape that follows the blade profile. The fin reduces noise by breaking up the vortex shedding that occurs at the blade tips. This vortex shedding is a major source of noise from wind turbines. The fin disrupts the vortex shedding pattern, which reduces the noise emitted by the turbine. The curved shape of the fin matches the blade profile to maintain aerodynamic efficiency while still reducing noise.

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Reducing noise emissions from wind turbine blades by smoothing transitions between the pressure side and auxiliary parts like trailing edge combs. The method involves applying a screed, like a leveling material, over the transition area to eliminate steps or transitions that can create noise. Adhesive strips are used to hold the screed in place. This smoothes the pressure side surface and reduces noise compared to a sharp transition.

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Low-frequency noise reduction wind turbine blade design that can adaptively adjust the blade shape based on wind direction to reduce noise. The blade has noise-reducing sawteeth, guide vanes, and a movable adjustment sawtooth. When the wind direction changes, a motor rotates a worm gear that drives the adjustment sawtooth along a track to change its orientation. This allows the blade to cut airflow differently based on wind direction to minimize noise.

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Wind turbine blade design that reduces noise and vibration compared to conventional curved or straight blades. The blades are shaped like a tornado for improved stability and noise reduction. The tornado shape helps mitigate the impact of wind direction changes. The blades connect to a brace that transmits force to a permanent magnet generator on the shaft. This configuration converts rotational force into electrical energy without gears or bearings. The tornado blades, brace, shaft, and generator form a self-contained wind power system. The tornado blade shape reduces noise and vibration compared to straight or curved blades. The brace and integrated generator further minimize noise by eliminating gearboxes and bearings.

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Wind turbine blade noise reduction device that reduces blade noise while maintaining blade efficiency. The device uses noise reducing components that can move and reset when the blades rotate. The components include boards with holes and sponges that absorb noise when blown by the wind. Centrifugal force throws them out, but springs pull them back to protect the blades when stationary. This increases the blade area exposed to wind, improving efficiency.

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Reducing noise and vibrations generated by wind turbines to mitigate their impact on nearby residents and wildlife. This involves improving the soundproofing of the tower to reduce harmful low frequency sounds and vibrations like infrasound. By reducing the propagation of these frequencies through the tower, it can help minimize the disturbance to people and animals in the surrounding area.

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Low-noise wind turbine blade design that improves aerodynamic efficiency while reducing noise. The blade has an adjustable flap at the trailing edge made of acoustic metamaterial. The flap angle can be changed to increase lift at low wind speeds. The flap is also made of materials that absorb noise. By optimizing blade shape and adding noise-reducing flaps, the blade efficiency is increased while noise is reduced compared to traditional blades.

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Low-noise wind turbine blade with adjustable flaps at the trailing edge that can be moved to change the blade shape and improve lift and efficiency at low wind speeds. The flaps have sound-absorbing acoustic metamaterials to reduce noise radiation compared to fixed blades. The flaps can be moved using a drive mechanism to adjust the blade angle of attack. This allows optimizing blade shape for low wind starts and reducing noise pollution.

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Reducing noise and vibrations of wind turbines to minimize disturbance to nearby marine life like whales. The solution is to insulate the wind turbine tower to prevent harmful sounds and vibrations from being transmitted through the tower as the rotor blade passes by. This addresses the issue of offshore wind turbines disrupting marine life like whales due to the blade's noise and vibrations as it passes the tower.

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Reducing noise from wind turbine blades by shrinking the blade area during rotation. The blade is divided into two parts, the fixed blade section and a sliding moving plate that can contract. A hydraulic cylinder drives the moving plate to shrink inside the blade cavity. This reduces the blade's contact area with air and therefore noise, compared to a solid blade.

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Reducing edge noise in wind turbine rotor blades using active noise cancellation. The blades have sensors to detect flow characteristics near the trailing edge and actuators to produce anti-noise signals. Multiple sensors are aligned with multiple actuators to cancel flow-induced edge noise. The signals from the sensors are combined to create spatial noise suppression signals emitted by the actuators. This active noise cancellation mitigates edge noise without affecting blade shape.

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Rotor blade for wind turbines that reduces edge noise by using active feedback control. The blade has sensors along the trailing edge to measure surface pressures. Actuators, like speakers, are placed at corresponding locations. The sensors detect pressure fluctuations that generate noise. The actuators emit opposite pressure fluctuations to cancel out the noise. The sensor spacing is logarithmic to match the wavenumber spectrum of trailing edge noise. This active feedback control reduces blade edge noise without affecting aerodynamics.

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Wind turbine blade design with internal damping elements to reduce noise and vibration during operation. The blades have cushioning elements extending from the interior surface to absorb impacts and vibrations. This prevents debris falling inside the blade from striking the interior surface and generating noise. The cushioning elements also reduce structural damage from internal debris impacts. The blades can further have acoustic dampening elements to absorb noise propagation through the blade interior.

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A noise reduction device for wind turbines that can significantly reduce the noise generated by wind turbines and mitigate the adverse effects on nearby residents. The device consists of a cladding piece with a sound-absorbing material attached to the outside of the wind turbine tower. The cladding piece has irregular shapes like holes, bumps, pits, or particles on its surface. This allows some noise to be reflected, some to penetrate the cladding, and some to be absorbed and converted to heat by the sound-absorbing material. This reduces the overall noise transmitted by the turbine to nearby areas.

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A low-speed, low-noise wind turbine blade design for urban areas with low rotor speeds to mitigate noise and vibration issues. The blade has a maximum tip speed of 100 km/h or less, regardless of wind speed. The blade shape has a covered metal suction panel on one side, rather than fully occupying the side. This reduces drag and noise compared to fully enclosed blades. The covered metal structure allows fossil fragments inside to reduce noise further. The reduced tip speed and unique blade shape enable low-noise, low-speed urban wind power generation.

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