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'Failure to find position and velocity initial conditions' error in Adams/Car on SPMM testrig

'Failure to find position and velocity initial conditions' error in Adams/Car on SPMM testrig

'Failure to find position and velocity initial conditions' error in Adams/Car on SPMM testrig

(OP)
Hello,

I am performing DOE using Adams/Insight on my full vehicle model in Adams/Car. The issue I am facing is - if I simulate the model on SPMM testrig within the Adams/Car interface, it works fine but when I try to simulate the model for multiple trials through Adams/Insight, I get a 'position and velocity initial conditions' error. The DOE keeps on running though even after the error but gives out garbage values.

I am attaching the .msg file here if someone wants to refer. I would appreciate any help or suggestions.

PS: I already performed DOE on this same model for constant radius cornering (Cornering event) maneuver and it ran successfully.

Error:
---- START: ERROR ----
Failure to find position and velocity initial conditions.
---- END: ERROR ----

Simulation Step Function Cumulative CPU Slvr
Time Size Evaluations Steps Taken time type
___________ ___________ ___________ ___________ ________ ___
0.00000E+00 0.00000E+00 0 0 1.06 1


---- START: ERROR ----
Failure to find position and velocity initial conditions.
---- END: ERROR ----



---- START: ERROR ----

Static equilibrium analysis has not been successful.
The maximum number of iterations 250, has been reached.
For the last attempted iteration:
The equation with the largest error was model.FWD_rear_macpherson_strut.bgl_hub_compliance.field Comp = 3 Error = 6488941844.446731
The variable receiving the largest increment was model.FWD_rear_macpherson_strut.bgl_hub_compliance.field Comp = 4 Delta = 178998974445.525299.
---- END: ERROR ----

RE: 'Failure to find position and velocity initial conditions' error in Adams/Car on SPMM testrig

As the error message says

QSTATIC: Static equilibrium analysis has not been successful at the
initial time for a Quasi-Static Simulation. Try adjusting the EQUILBRIUM
settings and/or performing one or more preceding STATICS analyses at
the initial time to create a "static funnel".

You could also try different solvers.

Usually SPMM is pretty robust. Which constant radius event did you use?

Cheers

Greg Locock


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