Jhula principle - increase speed by applying brakes.

[prajna]

Stefan, The jerky movement is not necessary, it could be started in sync. But it is interesting that it comes into sync, is it not?

There are two different beams. The main counterweight is 1.44Kg and the trim tab is 30g. Changing the length of the trim tab makes a subtle change in the centre of mass of the counterweight. Without it I would have to change the position of the counterweight axle (which is difficult). The pendulum doesn't really go between the beams, you can select the pendulum and press Ctrl-F to bring it to the front.

I haven't played with friction in WM2D. I am currently working on a model that runs much faster and accelerates to destruction. I have added a rotational damper to that one, which kicks in when it turns faster than 10 rads per second.

[hartiberlin]

Hi Pranja,
please try yourlast model with other friction settings than
High air resistance= 0.3 kg/m^2.
If I set it to 0.2 or 0.5 kg/m^2
it comes to a stillstand.
I even removed the damper !

So we have to find a model, that works at least in a wider
air resistance range, otherwise I would guess it is a program error...


Regards, Stefan.

[hartiberlin]

This kind of swinger works also until selfdestruction
over awide range of air resistances !

Test it out:
Attached the model

[hartiberlin]

Hi Pranja,
how do you make easily this one way gear in this pin joint ?
I saw, that you make a rigid joint over a pin joint and define:
(Constraint[3].dv.r<=0)

What does mean dv.r ?

Did you set this manually or does the program do this for you ?

[Sataur]

I believe dv.r is change in rotation of a particular joint (labeled Constraint['x'] where 'x' is the number label of the joint).

If dv.r is negative, it means the joint is rotating in one direction (counterclockwise I believe), and when its positive, its rotating in the other direction.

Correct me if I'm wrong on this Prajna.