Dynamic analysis (full vehicule)
Altair EmployeeHii
when i perform analysis for full vehicule it shows this ERROR message : At time=5.403E+00 the integrator failed to proceed. How can i solve the problem while i don't have inertial matrix values of the rear suspension ?
----------- 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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Are you using wizard model to run the full vehicle simulation?
If yes, did you change anything within the model? this could have caused this error.
If possible, please share the model file and .log file.
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yes i changed all bodies features (mass and inertial matrix), because i should perform analysis for a specific model. Below the mdl i used
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Thanks. Can you provide the control arm .h3d file through file transfer link in my signature below?
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I need these files from you
Message: Error: Could not succesfully read h3d file
'C:/Users/Madrex-101/Desktop/RIHAM_CALCUL/Modele_vehicule/triangle
G/triangle G.h3d' specified for flexbody 'Lwr control
arm-Flexbody-left' under 'Model-Frnt macpherson susp (1 pc. LCA)'.
This h3d file may not contain MotionSolve specific information.
2 Message: Error: Could not succesfully read h3d file
'C:/Users/Madrex-101/Desktop/RIHAM_CALCUL/Modele_vehicule/triangle
D/triangle.h3d' specified for flexbody 'Lwr control
arm-Flexbody-right' under 'Model-Frnt macpherson susp (1 pc.
LCA)'. This h3d file may not contain MotionSolve specific0 -
it's done. let you know that i have no specific information about rear suspension this could have caused the error because i didn't change inertial matrix.
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it doesn't work, i have the same problem
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i tried an integration tolerance of 1, but the results are not satisfying at time 2.49 the front suspension become deformable as the capture below shows it
<?xml version="1.0" encoding="UTF-8"?>
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Yes, it may happen as you are loosing the tolerance and reducing the accuracy.
I will once again check your model and will update to you soon.
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i will wait for your answer and thanks for help
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Hey Prakash
Is there some news about the solution ?
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Could you tell me where is exactly the problem.
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Hi @riham1994
I re-created with your flexbodies and not sure what are all changes you made but try this model.
Copy flexbody H3ds to the same folder of model file.
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the model doesn't work it says that there is an export fail !
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RIham,
Can you share the .log file. The shared file is working fine at my end.
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hi Prakash,
I can't have the log file because i can't perform straight line braking analysis due to export model failure as shown below.
<?xml version="1.0" encoding="UTF-8"?>
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Unzip the file to location specified in the error message and try again.
<?xml version="1.0" encoding="UTF-8"?>
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Same problem
/emoticons/default_sad.png' srcset='/emoticons/sad@2x.png 2x' title=':(' width='20' /> i think it's a matter of the version 12.0 i'm using !!
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it's finally working.. i created a fake folder v14.0 with the same location. i will update to you soon if the model have no problem with braking analysis.
Ps: Thank you soo much for helping me
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it only works in a braking analysis, i want to perform cornering analysis, J turn analysis, accel analysis and other. And also to change parameters of braking analysis such as deceleration. How can i do it?
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hii Prakash,
Could you answer me please
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Hi @riham1994
I just tried with braking analysis. Let me try with cornering and I will share the solution.
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