Simulation Error
Hi ,
I am getting this error which is shown below. I understand because of step size but I really dont have clue how to avoid this error. I tried to change the stepsize and other values in Run option but this error keeps coming. Can you please help me with this. Attaching Log file for your reference.
WARNING: Stepsize has diminished consistently below h_min [=1.000E-06].
ERROR: At time=7.556E-01 the integrator failed to proceed.
----------- Possible Causes -----------------------------------------------------
(1) The integration has become unstable. Tighten (decrease) integr_tol, h_max,
or both in Param_Transient can help stabilize the integration. If the simulation
contains distinctive phases, use multiple Simulate, each with its
own proper integrator parameter setting, to selectively tighten the tolerance
during the period where instability is encountered.
(2) If the simulation was terminated because stepsize has diminished consistently
below h_min, reduce h_min in Param_Transient to force integration to continue.
(3) Non-physical inertia properties, such as mass=100 Kg and Ixx=Iyy=Izz=1 Kg*mm^2,
or extremely small inertia on a part with an unconstrained degree of freedom.
Make sure the modeling data, in particular the part inertia and the gravity, are
specified in proper units consistent with the units given in Param_Unit element.
(4) Beam, flexible body goes out of linear range, bushing has large rotation along
more than one axis, curve goes out of its interpolation range, higher-pair joint
goes out of the range of U or V, etc. Make sure fundamental modeling assumptions,
such as rigid contact assumption used in Force_Contact, are not violated.
(5) Motion displacement defined using LINSPL, AKISPL in dynamic analysis, or as a
function of model states (DX, VX etc), as well as forces defined as a function of
other forces, can cause hard convergence and integrator failure. Avoid these
modeling practices wherever possible.
Answers
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Hi-
The integrator has become unstable at about .75 seconds.
Review your animation results, including animating the force vectors to identify any forces that are changing rapidly.
You may need to simplify your model (i.e. make the flexbody rigid, reduce the number of forces in your model, etc.) to really get to the bottom of the issue.
Carefully review the masses in your model to make sure they are all physically realistic.
The message shown gives you a lot of things to check, but you indicate you've only tried to change the integrator settings. The integrator itself is likely not the issue, there is some modeling error you need to find.
As I always remind people, 'crawl, walk, run'
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