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Chimney TMD
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Chimney TMD的概况 -
Steel chimneys typically have low structural damping, making them prone to wind-induced vibrations. The use of passive tuned mass dampers can effectively control vibration and extend the service life of chimneys. Passive, semi-active, and active systems are all used in the construction of buildings and bridges.Tuned Mass Dampers (TMDs) are an economical and reliable solution for reducing vibrations in buildings, machinery, and equipment.The tuned mass damper is based on multiple principles:Passive systemSemi-active systemActive systemPassive tuned mass dampers are an effective method for reducing vibration. Composed of a mass body, springs, and dampers. Adjust according to the structure to reduce resonance vibration.When there are changes in structural characteristics or insufficient installation space for passive tuned mass damping systems, active and semi-active systems are used.Working principle: Principle of passive tuning mass damperModern structures with slender, cantilevered shapes typically have a lower degree of structural damping, making them susceptible to vibration excitations caused by wind and traffic loads, as well as pedestrian movement. Tuned mass dampers can increase structural damping, thereby reducing resonant vibrations. Tuned mass dampers can be adjusted according to the natural frequency of the structure, consisting of rigid bodies (pendulum or spring), damping elements, and moving mass bodies.
Amplification function A (ƞ) used to explain the functional principle of passive tuned mass dampersPrinciples of semi-active and active systemsThe characteristic of semi-active systems is that the damping characteristics and natural frequency of the tuned mass damper can be permanently adjusted. Therefore, good results can also be achieved in buildings with variable attributes.The active system consists of actuators with reactive mass and control units with sensors. By continuously detecting the vibration of the structure to generate damping force, the vibration of the structure can be reduced.
The transmission factor explains the working principle of actively tuned mass dampers -
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