09-09-2016, 04:46 PM
1454248270-TMD.pptx (Size: 1.05 MB / Downloads: 12)
Classification of tuned mass dampers
Passive Tuned Mass Dampers
Active Tuned Mass Dampers
Semi-active Tuned Mass Dampers
Hybrid Tuned Mass Dampers
Passive Tuned Mass Dampers
These Dampers does not require any external source of energy
Initially the frequency of vibration damper is adjusted to that of the building
The main aim is to consume the input energy, thereby reducing energy dissipation demand of main structure
Active Tuned Mass Dampers
These Dampers require external source of energy
The active system has actuator and sensors
The frequency of vibration (magnitude and direction) of the damper is controlled by actuator in response of the structural vibration
Semi-active Tuned Mass Dampers
These are mainly derived from the passive TMD
Semi-active dampers require only nominal amounts of energy to adjust their mechanical properties
There is no input of energy in the structure but energy is just used to reduce the motion
Hybrid Tuned Mass Dampers
It is the combination both active and passive TMD
A passive device is utilized to control the larger portion of the response
While the active device is utilized to optimize the response to the given excitation and maintain the passive system within desired parameters
Hybrid control system can operate well due to the passive control part even if the active control part may not work
Active portion is used only when there is high building excitation
Advantages OF TMD:
They are inherently compact, modular devices that can have a simple interface to the base structure.
A well-designed TMD can add high damping with minimal weight.
The TMD does not impact the static strength or stiffness of the base structure.
Disadvantages OF TMD:
TMD system in a high-rise building needs a huge mass and a large room for installation at the top floor of the building, causing extra production cost and storage space problems.