table with vibration damping

[cromos]

Hello.

I saw a television program where a gip seat was described with the feature of cancelling the vibrations caused

from the roughness of the soil.

the seat was made by mounting a series of pistons, moved to an electronic device

able to read vibrations and correct the stroke of the pistons

that cancel the vibrations caused by the soil in this way the seat remains leveled horizontally without vibration.


I would like to know if it is possible to apply the same principle to a table

in order to maintain it exempt vibrations for example during an earthquake.

you could use gyroscopes applied to the four sides able to send the signals to a computer that can control the pistons

inserted into the legs of the table?

 

[stevie]

Hello.

I saw a television program where a gip seat was described with the feature of cancelling the vibrations caused

from the roughness of the soil.

the seat was made by mounting a series of pistons, moved to an electronic device

able to read vibrations and correct the stroke of the pistons

that cancel the vibrations caused by the soil in this way the seat remains leveled horizontally without vibration.


I would like to know if it is possible to apply the same principle to a table

in order to maintain it exempt vibrations for example during an earthquake.

you could use gyroscopes applied to the four sides able to send the signals to a computer that can control the pistons

inserted into the legs of the table?

this technique is called active damping and has been in use for years for example on structures of a certain relief such as bridges
The cost of control electronics and the large scale of production allowed it to be used also in the car seats, although I know similar applications also on the seats of the French tgv
the concept is quite simple, by means of accelerometers or other devices the amplitude and frequency of the forceful action is detected, the signal is analyzed by an electronic control that commands actuators (electrics, hydraulics, etc) that impose to the structure to be damped a movement in counterphase regarding the action to be cancelled
So it seems very easy, but the main problems consist in the fact that the actuators race is limited so the system can only work up to certain amplitudes and also the system operates with a certain delay having to analyze the force to be eliminated and command the actuators, for this reason also the passing band or the maximum frequency to which the system works is limited
to do you can do everything but what would you need to stabilize a table during an earthquake?

 

[Fulvio Romano]

...the seat of a gip with the characteristic to cancel the vibrations caused by the asperity of the soil.

no, "annullare" is not an engineeringly realistic term. damping yes, reducing, maybe, but never "nothing".