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Double pendulum model and animation - Is the model correct? - Сообщения
Hi friends!
Now I am on the forum again!
Anime2.sm (55,59 КиБ) скачан 60 раз(а).

But the model is not correct. See please Alvaro model!
Now I am on the forum again!
Anime2.sm (55,59 КиБ) скачан 60 раз(а).

But the model is not correct. See please Alvaro model!
Отредактировано 30.10.2025 19:22:14
Russia ☭ forever, Viacheslav N. Mezentsev
1 пользователям понравился этот пост
sergio 29.10.2025 14:50:17
Слава, а когда этот новая версия плагина появилась?
Hi. My approach to solving the double pendulum problem.

double_pendulum.sm (75,92 КиБ) скачан 82 раз(а).
Best regards.
Alvaro.

double_pendulum.sm (75,92 КиБ) скачан 82 раз(а).
Best regards.
Alvaro.
3 пользователям понравился этот пост
Valery Ochkov 30.10.2025 07:45:32, Вячеслав Мезенцев 30.10.2025 09:13:40, sergio 30.10.2025 12:18:26
Triple pendulum - see errors at the second haft of time interval.
Pendulum-3-for-SMath.xmcd (220,62 КиБ) скачан 44 раз(а).

Pendulum-3-for-SMath.xmcd (220,62 КиБ) скачан 44 раз(а).

Отредактировано 30.10.2025 19:39:16
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Alvaro Diaz Falconi 31.10.2025 05:05:16
Hi. Using pure SMath code to deduce the equations of motion from the Lagrangian, with the functions in this post: https://smath.com/en-US/forum/topic/AeeMSM/Using-differentials.

double_pendulum_lagrangian.sm (174,64 КиБ) скачан 43 раз(а).
double_pendulum_lagrangian.pdf (503,4 КиБ) скачан 43 раз(а).
Best regards.
Alvaro.

double_pendulum_lagrangian.sm (174,64 КиБ) скачан 43 раз(а).
double_pendulum_lagrangian.pdf (503,4 КиБ) скачан 43 раз(а).
Best regards.
Alvaro.
2 пользователям понравился этот пост
WroteTriple pendulum - see errors at the second haft of time interval.
I no longer use Mathcad, except on rare occasions, when I rely on Mathcad version 11, which I consider the last decent version. So I can't see the triple pendulum file. And I suppose this is the situation for many SMath users who no longer have Mathcad readily available. But more than worrying about the conservation of energy, which seems to be a problem with the numerical method used, I'm more surprised to see how the future affects the past, since the animation shouldn't alter the trajectories already described by the particles as time passes.
This is my approach to the triple pendulum.


triple_pendulum_lagrangian.sm (135,01 КиБ) скачан 48 раз(а).
triple_pendulum_lagrangian.pdf (248,09 КиБ) скачан 49 раз(а).
Best regards.
Alvaro.
Отредактировано 31.10.2025 06:13:23
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Отредактировано 31.10.2025 07:38:52
WroteSee pls pdf
With those values:


triple_pendulum_lagrangian.sm (159,26 КиБ) скачан 46 раз(а).
Best regards.
Alvaro.
1 пользователям понравился этот пост
Valery Ochkov 31.10.2025 10:39:04
WroteWrote
I'm more surprised to see how the future affects the past, since the animation shouldn't alter the trajectories already described by the particles as time passes.
Best regards.
Alvaro.
For me too!
Alvaro, hi!
Is it posibble to solve the single pendulun problem with Lagrangian and rkfixed but without the al_nleqsolve function?
Is it posibble to solve the single pendulun problem with Lagrangian and rkfixed but without the al_nleqsolve function?
Отредактировано 05.11.2025 08:29:15
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