Viscous damping has been frequently used to cut down resonant vibration in most structures through energy dissipation mechanisms. This technology boosts the performance of structures and buildings.
The damping is created by filling large openings/openings in "laminar flow viscous damping areas" with high viscosity liquids or by filling the small openings (orifices) in "turbulent flow viscous dampers" with low-viscosity liquids.
I have made a quick overview of this damping system below. Keep reading.
Laminar Flow Viscous Dampers
This kind of damping units are multi-directional and are made of a piston (plunger) and a cylinder (container) filled partially with a viscous liquid. The vibrating motion of the piston through the liquid shears the said viscous liquid, dissolving the vibration energy and turning it into heat.
There is enough clearance and space between the piston and the cylinder and no seals were utilized in their making. Additionally , there is no metal to metal or metal to rubber contact to cause static friction or any other nonlinearity associated with unattractive solid to solid contact.
Why use viscous dampers?
Viscous dampers can significantly reduce earthquake-induced motions on structures and buildings. These are some benefits of using viscous dampers:
Less displacement - viscous dampers can reduce drift for no less than 50%
Less shear - the inter-story and base-share can be reduced for as much as 40%
Lower g-forces (acceleration relative to gravity) - viscous damper can lower the g-force in structures
Less deflection and stress - only viscous dampers can lower both deflection and stress in a structure or building in a seismic quake
Little in size - viscous or liquid dampers are relatively tiny and are self-contained
Easy installation - viscous dampers can be easily installed as an element of a base isolation system in a structure or as diagonal braces
Foreseeable - they're stable and have predictable performance even at varying temperatures
Simply produced - viscous damper can be produced easily in forces of roughly 10 mt to 800 mt
Lasts long - this damping system has an especially long life and seldom requires maintenance
The decrease in forces and displacement can imply less concrete and steel, thus offsetting the damper cost, and often, the final cost.
Parts of a viscous damper
Below are the characteristic parts of a regular viscous damper:
Piston Rod - is a brightly polished stainless-steel machined from a high amalgamate steel. The high polishing extends the life of the seal. Piston rods are made naturally rigid as they're built to resist compression buckling. They also must not flex/bend under load to avoid wounding the seal.
Cylinder - filled with damper liquids and must be well placed to resist pressure as the damper operates.
Liquid - silicon fluid is frequently used as they're totally non-poisonous, cosmetically inert and is thermally stable.
Seal - must ideally last for a minimum of 35 years. Since dampers sit unused for a very long time, seals must not exhibit sticking or allow damper fluid seepage.
Piston head - the part that divides the damper cylinder into two individual pressure champers.
Accumulator - used to accommodate thermal enlargement of damper silicon fluids. An accumulator is either a movable pressurised piston or a block of closed-cell froth, or sometimes a rubber bladder.
The damping is created by filling large openings/openings in "laminar flow viscous damping areas" with high viscosity liquids or by filling the small openings (orifices) in "turbulent flow viscous dampers" with low-viscosity liquids.
I have made a quick overview of this damping system below. Keep reading.
Laminar Flow Viscous Dampers
This kind of damping units are multi-directional and are made of a piston (plunger) and a cylinder (container) filled partially with a viscous liquid. The vibrating motion of the piston through the liquid shears the said viscous liquid, dissolving the vibration energy and turning it into heat.
There is enough clearance and space between the piston and the cylinder and no seals were utilized in their making. Additionally , there is no metal to metal or metal to rubber contact to cause static friction or any other nonlinearity associated with unattractive solid to solid contact.
Why use viscous dampers?
Viscous dampers can significantly reduce earthquake-induced motions on structures and buildings. These are some benefits of using viscous dampers:
Less displacement - viscous dampers can reduce drift for no less than 50%
Less shear - the inter-story and base-share can be reduced for as much as 40%
Lower g-forces (acceleration relative to gravity) - viscous damper can lower the g-force in structures
Less deflection and stress - only viscous dampers can lower both deflection and stress in a structure or building in a seismic quake
Little in size - viscous or liquid dampers are relatively tiny and are self-contained
Easy installation - viscous dampers can be easily installed as an element of a base isolation system in a structure or as diagonal braces
Foreseeable - they're stable and have predictable performance even at varying temperatures
Simply produced - viscous damper can be produced easily in forces of roughly 10 mt to 800 mt
Lasts long - this damping system has an especially long life and seldom requires maintenance
The decrease in forces and displacement can imply less concrete and steel, thus offsetting the damper cost, and often, the final cost.
Parts of a viscous damper
Below are the characteristic parts of a regular viscous damper:
Piston Rod - is a brightly polished stainless-steel machined from a high amalgamate steel. The high polishing extends the life of the seal. Piston rods are made naturally rigid as they're built to resist compression buckling. They also must not flex/bend under load to avoid wounding the seal.
Cylinder - filled with damper liquids and must be well placed to resist pressure as the damper operates.
Liquid - silicon fluid is frequently used as they're totally non-poisonous, cosmetically inert and is thermally stable.
Seal - must ideally last for a minimum of 35 years. Since dampers sit unused for a very long time, seals must not exhibit sticking or allow damper fluid seepage.
Piston head - the part that divides the damper cylinder into two individual pressure champers.
Accumulator - used to accommodate thermal enlargement of damper silicon fluids. An accumulator is either a movable pressurised piston or a block of closed-cell froth, or sometimes a rubber bladder.
About the Author:
To get more information about a viscous damper, go try the Magnetorheological Damper Lab. For other resources of mine, read more by clicking here.
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