9 results about "Tuned liquid damper" patented technology

This invention discloses a semi-active vibration suppression device and its control method for hybrid-tower wind turbines, belonging to the field of wind turbine vibration control technology. The device includes a main frame, pulley system, water tank, spring, magnetorheological damper, and intelligent controller. The pulley system enables bidirectional sliding between the frames, allowing the water tank to move freely in the horizontal plane. The water tank contains antifreeze and vibration-damping fluid, forming a tuned liquid damper. The spring and magnetorheological damper are connected parallel to each other to the frame. The control method employs a strategy combining an offline sample database and online PID fine-tuning: offline, a genetic algorithm is used to optimize PID parameters under different operating conditions to build a database; online, the current operating condition is identified to match initial parameters, and a fine-tuning genetic algorithm is used to optimize the PID parameters in real time, adjusting the damping force of the magnetorheological damper. This invention integrates the semi-active adjustment capability of the magnetorheological damper with the passive vibration absorption advantage of the tuned liquid damper, achieving multi-frequency vibration suppression. It features a compact structure, fast response, and strong adaptability, effectively extending the unit's lifespan and reducing operation and maintenance costs.

This invention discloses a rotatable, actively tuned liquid damper, comprising a damper housing with a first open side and a second closed side arranged opposite each other along its height. The damper housing is filled with a tuning liquid. A base is mounted on the closed side of the damper housing. A liquid level sensor is fixed to the inner wall of the damper housing. A main structure connecting plate is used for connection to the main structure. A servo motor is mounted on the main structure connecting plate, and the output shaft of the servo motor is connected to the base to drive the damper housing to rotate with the base. A cover is mounted on the open side of the damper housing for opening / closing the damper housing. This invention can adjust the liquid level of the tuned liquid damper to avoid frequency jumps to a certain extent, thereby achieving a good vibration reduction effect.

The utility model relates to a broadband vibration control double-control tuned liquid damper device with a failure protection mechanism, which comprises a double-curvature variable friction pendulum supporting unit, a vibration / vibration control unit, a vibration / vibration control unit, a vibration / vibration control unit and a vibration / vibration control unit, wherein the double-curvature variable friction pendulum supporting unit is arranged above a structure needing vibration / vibration control; the supporting steel platform is arranged above the double-curvature variable friction pendulum supporting unit; the tuned liquid damper body is arranged above the supporting steel platform, and the tuned liquid damper body is used for controlling the wind vibration response of the structure; the collision buffers are arranged at the two ends of the side face of the supporting steel platform, and the collision buffers are used for buffering and limiting under the extremely rare earthquake large-displacement working condition. Compared with the prior art, the broadband vibration control double-control tuned liquid damper device can be used for wind vibration control and has a good earthquake reduction effect, and the situation that when a rare earthquake or even an extremely rare earthquake occurs, the displacement of the damper is too large, and consequently a system fails can be avoided.

The invention discloses a multi-tuned liquid damper for cross-wind multi-modal vibration control of a floating fan tower drum, which comprises a floating fan tower drum, and a plurality of liquid dampers are fixedly connected along the vertical direction of the floating fan tower drum; each liquid damper comprises a connecting piece, an external cavity fixedly connected with the connecting piece and internal liquid arranged in the external cavity; through liquid damper distribution multipoint cooperative tuning, each damper performs effective energy consumption on main modal response of the position where the damper is located, the amplitude of a multi-order vibration mode is remarkably restrained, and the vibration reduction effect of the whole structure is improved. According to the invention, accurate tuning and efficient energy consumption of a plurality of key vibration modes are realized, the modal amplitude of each order is effectively reduced, and the resonance phenomenon is inhibited, so that the anti-vibration performance and safety of the whole tower drum are improved, the service life of a fan system is prolonged, and the maintenance and repair cost is reduced.

The invention relates to the technical field of vibration reduction and isolation of maritime work equipment, and discloses a multidirectional constraint vibration reduction and isolation device for maritime work equipment, which comprises a mounting connecting plate, a supporting block and a base, the base is integrally formed at the bottom of the supporting block, the mounting connecting plate is fixedly mounted at the top of the supporting block, and an annular cavity is formed in the supporting block; according to the invention, the six fan-shaped sub-chambers are arranged, each fan-shaped sub-chamber is filled with liquid, and the liquid can shake in multiple directions within the range of the whole chamber, so that the multi-direction vibration damping device is adapted to irregular vibration such as rolling and pitching of marine engineering equipment, and the vibration damping effect is improved. And meanwhile, a one-way vibration reduction mode can be switched by means of an adjusting mechanism, the vibration reduction efficiency in the specific direction is improved in a targeted mode, based on the resonance principle of the tuned liquid damper, the liquid shaking frequency is matched with the inherent frequency of the platform, and the reverse inertia force directly counteracts vibration energy.

The invention discloses an aquaculture net cage based on a wind power plant, which belongs to the technical field of fusion of marine renewable energy sources and marine ranching and comprises a wind generating set, a floating platform and an aquaculture net cage unit. The interior of the floating type platform is divided into at least two independent cabins through partition plates, water in a specific proportion is injected into the cabins to form a multi-order tuning liquid damper, and multi-order vibration of the platform in the marine environment is effectively restrained. The aquaculture net cage unit is connected to the lower portion of the floating type platform, a net of the aquaculture net cage unit is of a spiral surrounding curved surface structure and is supported by a framework with the adjustable lead angle, and axial vortex is formed under the effect of natural water flow to achieve self-cleaning. The system is further provided with an intelligent bait casting unit, and bait casting strategies can be dynamically adjusted according to real-time ocean current data. By means of the integrated design, efficient fusion of offshore wind power and deep sea breeding is achieved, and the device has the advantages of being stable in structure, self-cleaning, high in bait utilization rate, self-sufficient in energy and the like.

The application relates to an adjustable composite tuning liquid damper for structural vertical vibration control, comprising a base fixedly connected to a main structure; a slide rail vertically arranged on the base; a support frame slidably connected with the slide rail and capable of sliding up and down along the slide rail; a liquid vibration unit arranged in the support frame and fixedly connected with the support frame; and a vibration control unit located between the support frame and the base, with two ends of the vibration control unit being connected with the bottom of the support frame and the upper surface of the base respectively, wherein the vibration control unit comprises a spring element and a damper element arranged in parallel. Compared with the prior art, the application considers both low-frequency tuning capability and effective damping mass, realizes adjustable parameters, and enables effective mass to fully participate, so as to meet the engineering requirements of large-scale structural vertical tuning vibration control.

The application discloses a kind of shock absorption system and method, the shock absorption system includes pumping injection device and the pebble stratum of certain volume, pumping injection device is used to inject or pump liquid in pebble stratum, and pebble stratum is used as the foundation of building structure.The shock absorption system can change the mass of pebble stratum by pumping liquid to closed pebble stratum, realize the adjustment of pebble stratum inertia force size and the adjustment of self-vibration frequency, play the resonance effect and liquid sloshing friction energy dissipation through the movement of pebble stratum, reduce the vibration response of building structure, greatly improve the shock absorption energy dissipation efficiency of system, effectively reduce earthquake disaster, also can avoid sand liquefaction phenomenon under the earthquake action of natural pebble stratum;It can directly utilize the characteristics of natural pebble stratum, realize the device of tuning liquid damper shock absorption effect, and be applicable to different foundation conditions, construction is convenient, with good energy dissipation effect, the shock absorption system has pioneering engineering significance and practical value.