Modular built-in PTRMD precast concrete block and fan vibration control method

Abstract

According to the modular built-in PTRMD prefabricated concrete block and the fan vibration control method, a modular cavity concrete prefabricated part with a built-in rolling ball type collision tuned mass damper PTRMD is placed at the bottom of a Spar type offshore floating fan, under the condition that the use function of the structure is not affected, the vibration of the Spar type offshore floating fan is controlled, and the vibration of the Spar type offshore floating fan is controlled. And the pitching vibration of the mast type fan platform under the complex sea condition is effectively reduced. According to the invention, the vibration amplitude of the structure is reduced, the problem that the Spar type fan generates continuous large-amplitude pitching vibration under the strong wind wave coupling effect is solved, and the service life of the Spar type fan is prolonged. According to the invention, the prefabricated member is modularly designed, so that the integrated control function of the vibration of the Spar type offshore floating fan is realized; the TRMD has the advantages that the TRMD is simple in structure, free of springs and damping elements and low in maintenance cost, and the collision damper has the advantages of being high in robustness and wide in control frequency band.

Description

technical field [0001] The invention belongs to the technical field of structural vibration control, in particular to a modular built-in PTRMD precast concrete block and a vibration control method for a fan. Background technique [0002] As a common and easy-to-develop clean energy, wind energy has the characteristics of wide distribution, large reserves and no pollution. It has attracted attention and has been widely used. Wind energy development has great potential and will inevitably become an important part of the energy architecture. The main development method of wind energy is wind power generation. According to the development location of wind farms, wind turbines are divided into two categories: onshore wind turbines and offshore wind turbines. [0003] Offshore wind turbines include offshore stationary wind turbines, tension leg (TLP) floating wind turbines, barge floating wind turbines, semi-submersible floating wind turbines, and mast (Spar) floating wind turbin...

AI Technical Summary

Problems solved by technology

[0006] For onshore wind turbines and offshore pile-based wind turbines, torque and pitch control are usually used to improve the operating conditions of the wind turbines. Generally, the control frequency is required to be lower than the main vibration frequency of the system, but for floating wind turbines, the vibration frequency of the platform translational degree of freedom is is very small, which makes it difficult for the control frequency to be less than the main frequency of structural vibration, making the control possible to produce negative damping or even large resonance motion

Floating wind turbines are subjected to long-term uninterrupted broadband wave and wind loads. The traditional tuned mass damper (TMD) has a narrow control frequency band and cannot meet the control effect required by the wind turbine.

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