Hi,
in the example below I modelled a simple pendulum. To my understanding,
nonlinear static analysis should place the pendulum in the 'down' position,
i.e. aligned with the gravity vector. However, the static analysis seems to
blow up even for a small deviation from the static equilibrium position
(see output below).
Should the nonlinear static analysis work in this example case?
Thank you,
Simon
*Code: *
ChSystemNSC system{};
auto fixed_body{chrono_types::make_shared<ChBody>()};
fixed_body->SetBodyFixed(true);
auto pendulum_mass{chrono_types::make_shared<ChBody>()};
pendulum_mass->SetPos({1.0, 0.01, 0.0});
system.Set_G_acc({10.0, 0.0, 0.0});
auto rotation_link{chrono_types::make_shared<ChLinkLockRevolute>()};
rotation_link->Initialize(pendulum_mass, fixed_body, {});
system.Add(fixed_body);
system.Add(pendulum_mass);
system.Add(rotation_link);
system.DoStaticNonlinear(10, true);
*Output: *
Nonlinear statics
max iterations: 10
incremental steps: 6
stopping test: correction
relative tol: 0.0001
absolute tol: 1e-08
--- Nonlinear statics iteration 0 |Dx|_wrms = 12864.8
--- Nonlinear statics iteration 1 |Dx|_wrms = 9543.48
--- Nonlinear statics iteration 2 |Dx|_wrms = 6371.51
--- Nonlinear statics iteration 3 |Dx|_wrms = 10438.1
--- Nonlinear statics iteration 4 |Dx|_wrms = 6571.89
--- Nonlinear statics iteration 5 |Dx|_wrms = 6797.78
--- Nonlinear statics iteration 6 |Dx|_wrms = 6870.05
--- Nonlinear statics iteration 7 |Dx|_wrms = 16263.7
--- Nonlinear statics iteration 8 |Dx|_wrms = 9692.65
--- Nonlinear statics iteration 9 |Dx|_wrms = 29415.4
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