# Thread: how to make a model of the taipei towers?

1. id like to build a model of this thing:

the thing is that the phrequency of the building has to be resonant with the phrequency of the pendulum

but i find four factors here that have to match:

lenght of the cable, lenght of the building, mass of the hanging weight, mass of the building, oh and a fifht, center of gravity of the building

also the building wont vibrate, just balance, something like this:

http://fantasticcontraption.com/?designId=8703393#

(to see this you have to wait ten seconds and then click skip add?

any suggestion on how to build this thing?

edit:

i find this mechanism extreamly interesting since its a double pendulum non chaotic

2.

3. according science all and every double pendulum is chaotic

if this double pendulum resonated it would be non chaotic

but i wonder what does chaotic mean? the trajectory of a double pendulum is easily predictable not trully chaotic like gambling

4. Chaotic does not mean random.

5. yes i did some google and understand it now

still the taipei tower is kind of a double pendulum and i dont think is chaotic or it wouldnt work

edit:

yes apparently a non chaotic double pendulum is posible:

http://www.pendulum.es/english/estud...os.html#nocaos

In this game, two cushioned pendulums oscillate together. One of them, the main one, has a fixed period since the masses of which it is made always apply the forces in the same points. The secondary pendulum has an adjustable sphere that allows its period to be varied

How to set it in motion? Simply place the axis on the two concave surfaces of the columns and smoothly push the cylindrical masses two or three times: chaos result, or not!

Non-chaos? Maybe yes, maybe no; its a simple matter of the amplitude and periodicity of the oscillations* and of the adjustment of the secondary pendulum.

* Remember that the Isocronia of the pendulum is a simple approximation.

Hand-made piece.
Materials: Iron and brass.
Dimensions: h=30cm.
Design: Marc Boada, 2003.

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