ACCEPTED SOLUTION
Accepted Solutions
I'd say Yes!
I changed some initial Values and then forces became also positiv and negative.
How are you doing that the mass-points make lines in the diagram?
Is it a Vektor?
couldn't figure out it.
Sorry, by my ICs we have one positive force at t=1.8 s
I think the model is correct. Or?
Valery,
my physical understanding would say yes.
And the sum of all energies seems to be constant (Apart from the peaks in the diagram...)
But the peaks could be an inaccuracy in the calculation process of the simulation.
The amount of the maximum deviation in the diagram is only about 0.02 joules
acting Forces at:
and
are this:
at the time of 1.8s i got this result:
nearly constant energy of 0 Joules and a positive force F3.
What do you want more-I think it's ok with all.
regards Volker
ps.: please help me with a simple example to plot traces in a diagram like a mass point does make in your sheet.
Valery,
What are the Forces F1, F2, F3 exactly?
Are these the Forces which have the same direction like the strings (=colinear)?
I try to verify the acting forces again to be sure if all be allright.
>Are these the Forces which have the same direction like the strings (=colinear)?
Yes!
F<0 - Stretching of the string
F>0 - Compression - not possible with a string (see at t= 1.8 s). Check please!
>F>0 - Compression - not possible with a string (see at t= 1.8 s). Check please!<
With an ammount of 0.008 Newton- it's a inaccuracy of calculation in my opinion.
In that moment, we would have a free falling body.
We should do an experiment, and see what the string does make at the force>0. (needing a high speed camera)
If the strings are stiff (we didn't take into account at the beginning of our simulation) what would then happen?
I want to try to setup a calculation with Lagrangesche Formulas, but it's a hard way to do.
> it's a inaccuracy of calculation in my opinion.
I think this picture can tell us some thing about accuracy:
