Double pendulum

Double pendulum - Сообщения

#1 Опубликовано: 20.09.2026 10:08:09
Valery Ochkov

Valery Ochkov

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I feel the model is not correct - help please!
Pendulum-2-animation.sm (22,59 КиБ) скачан 187 раз(а).
Pendulum-2-animation.gif
Отредактировано 20.09.2026 10:09:28
#2 Опубликовано: 21.09.2026 11:02:24
Alvaro

Alvaro

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Hi Valery. The system is coupled. This is a way to solve it.

image.png

double_pendulum_lagrangian.sm (122,44 КиБ) скачан 186 раз(а).
double_pendulum_lagrangian.pdf (637,78 КиБ) скачан 129 раз(а).

Best regards.
Alvaro.
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ioan92 09.10.2026 19:34:51, Valery Ochkov 21.09.2026 16:39:03
#3 Опубликовано: 21.09.2026 14:02:10
Вячеслав Мезенцев

Вячеслав Мезенцев

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Yes, that is correct; I previously reported on the limitations regarding the systems.

The algorithm does not currently classify the task, so issues may arise with complex problems that the current method cannot solve. It might produce a plausible-looking solution that does not actually address the problem at hand.
Russia ☭ forever, Viacheslav N. Mezentsev
#4 Опубликовано: 21.09.2026 16:47:18
Valery Ochkov

Valery Ochkov

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Thanks, Alvaro.
It reminds me of an old joke.
A funeral. A passerby asks, "Who are they burying?"
"That guy lying in the coffin."
That was a mathematician's answer—completely accurate and completely useless.

Mathcad 15
double_pendulum_Mathcad.png
Отредактировано 21.09.2026 16:53:09
#5 Опубликовано: 22.09.2026 10:43:08
Alvaro

Alvaro

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If mathematics is a tautology, then life must be one too. That joke reminds me of the one a plant process engineer played on me when I went to get the bourdon gauge I was supposed to install. Without a word, he handed me a brown box. That was when I have the bad idea of asking what was inside. His answer was that it contained a mechanical device that measures fluid pressure using a curved, flattened metal tube that straightens as internal pressure increases, driving an indicator needle across a calibrated dial.

The RKA function includes the necessary procedures to solve hard coupled systems.

image.png

double_pendulum_RKA.pdf (483,53 КиБ) скачан 122 раз(а).
double_pendulum_RKA.sm (43,57 КиБ) скачан 183 раз(а).

Best regards.
Alvaro.
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Valery Ochkov 22.09.2026 12:25:43, ioan92 09.10.2026 19:38:29
#6 Опубликовано: 08.10.2026 11:18:22
Valery Ochkov

Valery Ochkov

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Thanks, Alvaro!

But I cannnot create five f(t) plots:
Potential energy of pendulum #1
Kynetic energy of pendulum #1
Potential energy of pendulum #2
Kynetic energy of pendulum #2
Sum of energies for the verify the model and ODEs solver. Must be const.
Help please!
Отредактировано 08.10.2026 11:18:52
#7 Опубликовано: 09.10.2026 01:06:49
Alvaro

Alvaro

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Hi Valery. This is a way. You can plot the time in T versus U, K or U+K. The plot in the figure shows that the energy is constant. In this case also, the total energy is the hamiltonian.

image.png

double_pendulum_RKA.sm (49,21 КиБ) скачан 13 раз(а).

Best regards.
Alvaro.
Отредактировано 09.10.2026 01:19:29
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ioan92 10.10.2026 18:59:13
#8 Опубликовано: 09.10.2026 20:11:32
ioan92

ioan92

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Butterfly_Effect_Example.pptx (999,46 КиБ) скачан 6 раз(а).

Hi Alvaro & Valery,

I enjoyed the matematical results of yours developements, without following all details.

I propose you a problem, dealing with the Butterfly Effect on a double pendulum - after some cycles, the 2 pendulums becoms distinct. Attached there is a simple gif file

Do to others as you would like them to do to you! Knowledge is of no value unless you put it into practice - Chekhov
#9 Опубликовано: 10.10.2026 00:03:48
Alvaro

Alvaro

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Hi Ioan. Something like this.

image.png

BE.gif

double_pendulum_RKA Butterfly Effect.sm (50,58 КиБ) скачан 10 раз(а).

Best regards.
Alvaro.
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Valery Ochkov 10.10.2026 05:45:18, sergio 10.10.2026 08:51:15, ioan92 10.10.2026 12:34:44, Вячеслав Мезенцев 10.10.2026 16:02:19
#10 Опубликовано: 10.10.2026 12:30:41
ioan92

ioan92

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Ooo it's wonderful!!!

My dumb explanation is that time delay generate between the 2 instances generate different precision in the solution graphics and hence the graphical difference (?).

Alvaro - All my thanks for your proverbial attention,

Have a nice WE,
Ioan
Do to others as you would like them to do to you! Knowledge is of no value unless you put it into practice - Chekhov
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Alvaro 10.10.2026 19:03:11
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