Vibration Damping for Wind Turbine Noise Control

Device to reduce vibrations in wind turbine blades when the turbine is parked. The device attaches to the blade leading edge and protrudes beyond it to create an air channel in front. This disrupts airflow and mitigates vortex-induced vibrations. The device can be removably mounted and is configured for standstill conditions when the turbine is not generating power. It can also have a trailing edge element to form a trailing air channel behind the blade.

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Damping inter-harmonics in wind turbine generators using a retrotackable control strategy that adapts to the turbine operating point. The control system includes a parallel inter-harmonic damping loop with a resonant controller that tracks and dampens the specific inter-harmonics present at each rotation speed. This allows effective damping of the turbine's unique inter-harmonics without adding hardware, as the controller is tailored to the current operating conditions.

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Reducing gear induced noise from wind turbines by tracking and mitigating vibrations from gear meshing. The method involves generating a vibration map for each operating point of the generator, specifying the virtual phase of vibrations from gear tooth meshing relative to a reference phase. The generator is then controlled to counteract these expected vibrations by modulating the torque sinus when operating at those points. This aligns the generator output with the virtual phases to minimize gearbox vibrations and noise. The vibration map is generated by running the turbine normally and analyzing the gear meshing angles.

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Nonlinear energy sinks (NESs) have been widely applied as passive control units in the field of vibration control. In this study, a grounded combined-stiffness NES is proposed, which consists linear stiffness and cubic stiffness. The suppression performance model under different excitations investigated. First, slow-varying equations system are derived using complexification-averaging method, followed by derivation amplitude-frequency response equation. Next, influence parameters on reduction harmonic impulsive analyzed. Finally, comparative analysis conducted NES, after parameter optimization Grey Wolf Optimizer (GWO) random excitation. results indicate that introducing into can significantly enhance system's performance. However, compared to dissipation primary more sensitive variations

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Mitigating vibrations of a wind turbine when it is not connected to the grid to prevent damage. The method involves using stored energy to reorient the turbine blades when conditions are unfavorable for vibration buildup. Sensors detect wind direction, blade pitch, and vibration. If wind misalignment, high wind speed, or high vibration is detected, the turbine yaws to better align with the wind. This uses stored energy. By adjusting blade orientation, vibrations can be mitigated without grid power.

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Passive damping system for floating platforms like offshore wind turbine foundations to mitigate motion induced by waves and wind without active power consumption. The system uses compressible gas-filled containers inside the platform pontoons filled with liquid. Gas flow controllers can adjust gas flow between the containers to damp out platform motion at different frequencies. The compressible gas elements absorb and dissipate energy from environmental forces, reducing platform resonance.

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ABSTRACT The laminated composite structure with viscoelastic material inserted provides excellent performance of vibration and noise suppression, which has been extensively deployed for industrial applications, such as rail transportation. In this work, the aim is to present dynamics FGCNT reinforced (FGCNTRC) sandwich beam structures by conducting detailed parametric studies fundamental frequency (FF) loss factor (LF), give a reference engineers develop great stiffness damping. extended mixture rule method firstorder discrete layer model are applied deduce effective properties FGCNTRC faces differential equations structures, respectively. Five stacking configurations considered. Subsequently, Hamilton approach build equations, these solved using Navier method. Finally, change structural damping explored, follows: First, FF gradually becomes large, LF decreases volume fraction CNTs enlarging. Second, dimensionless increases, first increases then enlarging thickness ratio two layers. Third, enlarge h 2 / ratio, always diminishes, but when bigger, rises smaller, gradually.

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Studies that involve mitigating aerodynamic noise in rotating components such as rotors of wind turbines or propellers Unmanned Aerial Vehicles have gained immense interest the research community over last few years. The present study explores mitigation potential passive compliant coatings through Computational Aeroacoustics Analysis (CAA) and experimentation tunnel testing. CAA was performed on a flat plate for chord-based Reynolds number Re c = 460,000 using SST k- Improved Delayed Detached Eddy Simulation Ffowcs Williams Hawkings acoustic analogy. Trailing edge (TE) accurately predicted from 750 to 7000 Hz. Noise results were compared with cases where different material properties are applied onto plate. It observed coating-1 (Dow Corning Silastic S-2) may increase TE by 10 15 dB/Hz throughout frequency range interest, an Overall Sound Pressure Level (OASPL) 2.89 dB. Whereas coating-2 Sylgard 184) shifted energy content lower reduced 2 4 600 1575 Additionally, it resulted 1.85 dB reduction OASPL, thus demonstrating choice coating materials viscoelastic plays crucial role... Read More

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Considering that the existing research on motor using structure optimization to reduce noise is difficult further meet requirements of low noise, from transmission path, a new method viscoelastic free damping vibration and reduction based high-precision positioning sound source proposed in this study. Based motors intensity experiment, image reconstructed compressive sensing SP algorithm locate primary precisely. For design layer laying scheme, study theoretical influence storage modulus, Poissons ratio, thickness, other significant parameters asphalt material characteristics housing necessary. The motor-free scheme refined acoustic contribution obtained simulation analysis. schemes validity verified by applying sinusoidal sweep excitation. optimized experiments under multiple working conditions, experimental comparison results validate power level with accurately laid can be reduced up 4 dB(A).

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As the size and flexibility of wind turbine blades increase, aeroelastic challenges faced by turbines become more pronounced. To prevent blade damage due to vibration improve stability blades, this paper proposes a bionic with web inspired bamboo honeycomb structures. The fluid-solid interaction analysis is conducted using computational fluid dynamics finite element method, based on Shear Stress Transport (SST) k-w turbulence model. displacements, stresses, strains, modal, harmonic response analyses both original are evaluated underrated operating conditions. results indicate that, compared blade, maximum displacement reduced 10.1%, stress value surface 2.1% lower, strain 2.5% lower. buffers loads in stages during deformation leading improved resistance.

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One of nature's most plentiful energy sources is a wind conversion system, which also has higher sustainability and no pollution. Damping controllers are designed to enhance hybrid robustness adaptability when using permanent magnet double-fed induction synchronous generators. The generators integrated with convectional sources, requires careful consideration grid stability (rotor angle stability), helps prevent mechanical oscillation disruptions due the instability. Power system stabilizers excitation optimized assure power stabilizer settings for ideal damping performance ignore losses; essential.

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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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Tuning vibration damping device for wind turbine towers to reduce excessive vibrations that degrade performance and lifespan. The device consists of a tuned mass damping system that can be precisely adjusted to match the natural frequency of the tower. The device transfers vibration energy from the tower to itself, reducing tower vibrations. It attaches to the tower near the nacelle and has a tunable mass and spring system. The device is designed and installed using a method that involves calculating optimal parameters based on tower characteristics.

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Reducing noise from small-scale wind turbines by using a multi-modal approach involving multiple noise suppression materials targeted at specific sources and frequencies. The system includes acoustic fencing inside the tower to mitigate column and conical resonance, vibration isolation pads and mounts to suppress solid material transmission, and sound-absorbing batting to reduce airborne transmission. This comprehensive approach aims to reduce noise levels below regulatory guidelines and address social determinants of health concerns related to wind turbine noise.

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A vibration damping device for wind turbine generators that reduces vibrations and extends the life of wind power generation equipment. The device uses a circular housing with multiple radial shock absorbers around the perimeter. Each shock absorber has a ball hinge and vibration guide plate on the outer end. The generator body fits inside the housing and is clamped by the guide plates. This dampens vibrations in multiple directions. The housing and base have vibration damping components to further isolate the generator. The design allows adjustment of the damper pressure.

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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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Wind turbine vibration suppression system using rotating disks and active control to mitigate vibrations in wind turbines. The system has multiple vibration suppression devices located on the turbine tower and nacelle. Each device has a base, mounting frame, rotating disk, and driver. The disks rotate at high speeds relative to the frames. A controller receives vibration acceleration from the turbine and drives the disks at matched speeds to counteract the vibrations. The disks with predetermined rotation speeds match the vibration frequencies to provide effective vibration suppression.

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Reducing noise from vertical axis wind turbines in built environments. The invention involves a sound attenuation arrangement for vertical axis wind turbines installed in urban areas. The arrangement includes fixed stator elements around the turbine rotor. These elements have sound absorbing material to dampen noise. The turbine, with its fixed stator elements, is installed in a structure like a building. This provides additional sound attenuation from the turbine. It aims to significantly reduce noise from vertical axis wind turbines in built environments.

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Active noise reduction for wind turbines that uses sensors and actuators on the blades and tower to cancel trailing edge noise. The system has unsteady pressure sensors on the blades to detect turbulent flow conditions. Noise sensors on the tower or nacelle measure blade noise. An adaptive filter controlled by a unit on the blades generates an anti-noise signal based on the sensor outputs. Actuators like speakers emit the anti-noise to counter blade noise. The filter adjusts based on blade orientation to optimize cancellation when the blade is downward.

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A wind power generation system that uses vibration control to reduce costs and improve reliability by suppressing vibrations without adding external dampers. The system has converters and transformers inside the nacelle, separated by safe vibration zones. Vibration control is achieved by adjusting the stiffness of elastic elements and applying voltages that vary the currents through electromagnetic elements. This allows targeted vibration damping of individual components without adding external dampers, improving overall vibration suppression and extending equipment life.

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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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Impulse damper for reducing extreme vibrations in tall, narrow structures like wind turbines. The damper has resilient impact-damping elements on both sides to absorb vibrations. It mounts on the structure and has mass to create an impulse when it moves. The damping elements deform as the mass strikes them, dissipating energy and damping vibrations. The damper is particularly effective at damping the second natural frequency of tall structures. It can have multiple small damping elements instead of a few large ones to spread heat dissipation. The damper can have continuous damping elements on both sides to absorb vibrations in all directions.

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Wind turbine generator vibration isolation device with inertial decoupling to reduce vibrations and improve performance. The device has a protective casing with internal vibration isolation structures. It contains vertical, lateral, and longitudinal inertial capacities that are vertically stacked inside the case. These capacities isolate and decouple vibrations in the three directions. The stacked inertial capacities are connected internally to fix and support the structures inside the case. This provides three-way decoupling of vibrations that can occur in different directions.

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Three-way decoupling wind turbine generator vibration isolator and optimization design method to reduce generator vibrations in horizontal, vertical, and longitudinal directions. The isolator has separate vibration isolators in each direction to decouple vibrations. It uses a rubber-metal composite ring between the generator and frame, with isolators in all directions. By optimizing the isolator parameters like stiffness, mass, and damping, the vibration levels can be further reduced.

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Vibration damping support for reducing vibrations and impacts in wind turbines. The support has a shell with damping assemblies inside. It connects equipment to the turbine. The damping assemblies absorb vibrations and impacts transmitted through the equipment and adapter. A snap plate connects the adapter to the shell to directly transmit vibrations to the damping assemblies. A bottom vibration damping sleeve further absorbs vibrations at the shell-turbine connection. This provides multiple stages of vibration reduction.

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Gearbox vibration damping device for wind turbines that reduces vibrations and prevents damage to the gearbox. It uses a support assembly, vibration seats, and springs to isolate the gearbox from the turbine's main body. The support plate attaches to the turbine housing. The gearbox sits on a vibration seat with a spring. Another seat below has a spring and bolt to secure the gearbox. This setup allows the gearbox to move downward under force, preventing excessive vibration.

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Vibration damping system for wind turbines using viscoelastic materials to improve fatigue life and reduce maintenance costs. The system involves adding viscoelastic links between structural components of the turbine, like the tower and blades, to damp vibrations. The viscoelastic materials store and convert strain energy into heat, reducing vibration amplitude. The links are chosen based on the temperature range of the turbine area to optimize damping effectiveness.

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Method to dampen vibrations of wind turbine towers and nacelles during construction when the turbine can't be completed. Vibration attenuators are temporarily installed on the nacelle to counteract vibrations caused by eddy currents in the tower due to wind. The attenuators are connected to the nacelle main shaft or transport interface. This allows damping of specific frequencies like the tower's fundamental mode around 0.1 Hz. The attenuators can be passive or adjustable before installation.

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Blade damping system for wind turbines with flexible blades to mitigate vibrations and improve reliability. The system has a sliding mechanism with springs and rods between the blade root and hub that compresses when the blade vibrates. This absorbs the force and prevents excessive blade motion. The mechanism consists of sliding sleeves connected by rods, springs, and hub plates. When the blade vibrates, the hub motion compresses the springs and slides to dampen the vibrations.

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A blade damping system for wind turbine blades that improves damping, shock absorption, and transmission of vibrations to reduce blade fatigue and improve turbine efficiency. The system uses internal damping mechanisms in the blade root that include ball bearings, rubber gaskets, shock-absorbing sleeves, sliding assemblies, springs, and magnetic plates. These components damp, transmit, and limit blade vibrations during operation to prevent resonance and fatigue.

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Viscoelastic damping element for wind turbines to reduce vibrations and increase fatigue life of structures. The element is made of viscoelastic material that exhibits wider band damping characteristics due to its structure. It is designed to be attached to wind turbine components like blades or towers to dampen vibrations caused by wind loads. The viscoelastic material converts vibration energy to heat and provides effective damping in a temperature range where the material is in the transition region between elastic and viscous behavior. The damping element is an alternative to traditional vibration dampers like tuned mass dampers or liquid column dampers.

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