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Tuesday, September 24, 2013

Base Isolation and Vibration Control Systems



LRI (Lead Rubber Isolator) device
LRI (Lead Rubber Isolator) device

This is a base isolation device that has thin rubber sheets and steel sheets laminated in a circular form with a lead plug inserted in the center. This device is able to withstand loads, absorb seismic energy, dampen vibration during an earthquake, and then reset itself to the original position following the seismic event.
CLB (Cross Linear Bearing) device device
CLB (Cross Linear Bearing) device device

This is a load-sustaining device that moves smoothly in a horizontal direction. It can be used either with lightweight or heavy buildings and features a high bearing capacity against the pullout force.
Vibration damping walldevice
Vibration damping walldevice

This is a thin steel box with a steel plate inserted from the upper floor. 
It is fixed on the floor and filled with a viscous fluid. It has a simple 
structure and can be used to attenuate the vibration caused by wind,
earthquakes, and other movement-generating phenomena.
FLR (Flat Lead plug Rubber) device device
FLR (Flat Lead plug Rubber) device device

This is a damping device that consists of laminated rubber sheets with a lead plug inserted in the center. The area that the lead plug occupies is larger than that of the lead plug in the LRI device. Although it is small in size, it produces a large damping effect and is used to control the vibrations in a high-rise building caused by earthquakes.
Damping cylinder device
Damping cylinder device

This is a cylindrical attenuates device that dampens vibration by converting and expanding micromotion in an axial direction to rotational motion. The unit itself is small in size but very powerful and is used to attenuate vibrations, caused either by wind or earthquake, in structures ranging from high-rise buildings to steel towers
Suspended floor aseismic insulation
Suspended floor aseismic insulation

The floor is suspended from an upper structure to control
horizontal and vertical vibration. This approach has been adopted, 
for example, to construct the floor of an electron microscope room 
where the requirement is to control vibration with a precision of microns.
PSA
PSA

This is a viscous damping device designed to increase viscous resistance using a communicating tube. Because it has a pantographic mechanism, it produces a powerful damping effect and is able to attenuate not only microvibration but also earthquake motion.

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