Pagina in costruzione
<!doctype html>
Double Pendulum — Poincaré Section
Paste this whole HTML into a WordPress Custom HTML block (or into a page template). Use the controls to set initial conditions, run the simulation, and generate a Poincaré section (records when θ₂ crosses the chosen section angle).
Plot: θ₁ (wrapped to -π..π) vs ω₁ at each crossing of θ₂ = section angle.
Quick tips
- Increase steps to collect more Poincaré points (this is a long-run integration).
- Use small dt (0.001–0.01) for stability/accuracy; RK4 is used here.
- To get a dense section, run for many steps or run multiple nearby initial conditions.