Just recently I have started using Adams/CAR for double wishbone suspension kinematic and element force analysis. Before I used to build my wire frame rigid models using Adams/View which worked great as far as the simulation is concerned but it lacked the prebuild functions for example setting/measurement of Camber, Toe etc. that Adams/Car is specialized for. I have went thru most of Adams/CAR tutorials dealing mostly with template usage, which should be fine for my case. This was my workflow for front suspension analysis:
1. created a new assembly with TR_front_suspension.sub as the only subsystem (i will include steering subsystems later, for now only bump-rebound characteristics)
2. modified hard points to suite my design. My coordinate system is in the intersection of ground plane/fvsa plane/longitudinal symmetry plane. x-axis is pointing forward y-axis to the left which is opposite in Adams so i just changed the sign in these two directions. Also I set every coordinate of testrig to 0 I
3. I modified coil over properties to linear spring (i have only theoretical spring calculations) and some minimal damping (at this point i am not concerned with velocity-damping response)
4. Edited tire data (unloaded radius and tire stiffness) and vehicle parameters.
5. Suspension analysis: parallel travel 80mm bump -60mm rebound

With default solver settings I got this message:
=================================================================
Adams/Tire
Version Adams 2013.2
=================================================================

acar_2013.1.0/ac_scc_init

Reading ARRAY parameters using the
ADAMS/Car array statement definitions.

acar_2013.1.0/ac_scc_init

Checking ARRAY parameters...

-------------------------------------------------------------------------------
| Model Title |
|=============================================================================|
| |
| Adams/Car Assembly (Adams 2013.2) |
| |
-------------------------------------------------------------------------------

command: preferences/solver=CXX
command: preferences/list,status=on
PREFERENCES:
SIMFAIL = NOSTOPCF
Contact Geometry Library = Default
Contact Faceting Tolerance = 1
Thread Count = 1
Library Search Path = Not Set
Status Message = On
Solverbias = CXX (C++ Solver)

command: control/ routine=acarSDM::con950, function=user(950,29,31,1,2,18,20,1,3,2,3,28,30,2,3,28,30,1,1)


Begin Static Solution


STATICS: Original static solver will be used with the Sparse linear solver.


---- START: WARNING ----
Actuator reached upper force limit

---- END: WARNING ----


---- START: ERROR ----

Static equilibrium analysis has not been successful.
The maximum number of iterations 25, has been reached.
For the last attempted iteration:
The equation with the largest error was model.TR_Front_Suspension.ges_subframe Comp = 8 Error = 200849082.519939
The variable receiving the largest increment was model.testrig.jolfix_table_fixed Comp = 4 Delta = 161973045.741471.

---- END: ERROR ----
Static Solution failed to converge

End Static Solution

Simulation failed



---- START: ERROR ----
Initial Static Sim. Not Successful
ID = 0


---- END: ERROR ----


---- START: ERROR ----

Adams/Solver run terminating due to STOP requested by user.


---- END: ERROR ----

Termination status=-995

Terminating Adams/Car usersubs...


Finished -----
Elapsed time = 0.31s, CPU time = 0.30s, 96.08%
Analysis failed!
Please check the error messages to determine the cause.
-----------------------------------------------------------------------------------------------------------------------------------------------------------

Then I increased the MaxIt for static solver from 25 to 50. It convergences to a result but it's nonsense (see attached 1.jpeg) This is the lower part of the message:

------------------------------------------------------------------------------------------------------------------------------------------------------------
****** Performing Quasi-Static Simulation ******

---- START: WARNING ----

The Reconcile Acceleration-Force has detected a singular Jacobian matrix.
This problem may be caused by:
(a) A constraint equations that became almost redundant, e.g., the model
is at a singular configuration or at a bifurcation point.
(b) A massless PARTS in the model.

The Sparse Solver has detected a zero pivot for row 67 (during the symbolic pivot selection).
The corresponding equation is: Part/26 X Force

A minimization algorithm will be used to find a solution on the
projected constraint manifold.

---- END: WARNING ----
Simulation Step Function Cumulative CPU
Time Size Evaluations Steps Taken time
___________ ___________ ___________ ___________ ________
1.00000E+00 0.00000E+00 0 0 0.70
2.00000E+00 1.00000E+00 116 13 0.75
3.00000E+00 1.00000E+00 124 14 0.80
4.00000E+00 1.00000E+00 132 15 0.83
5.00000E+00 1.00000E+00 140 16 0.88
6.00000E+00 1.00000E+00 148 17 0.94
7.00000E+00 1.00000E+00 156 18 0.98
8.00000E+00 1.00000E+00 165 19 1.02
9.00000E+00 1.00000E+00 174 20 1.08

---- START: WARNING ----
Actuator reached upper force limit

---- END: WARNING ----
1.00000E+01 1.00000E+00 209 21 1.22
1.10000E+01 1.00000E+00 228 22 1.30

End Simulation

Simulate status=0

command: !
command: stop

Termination status=0

Terminating Adams/Car usersubs...


Finished -----
Elapsed time = 1.30s, CPU time = 1.30s, 100.07%
Simulation(s) are complete!
Loading analysis results...
Removing analyses of the same name from session...
Loading results done.


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Do you know what is wrong with my input data. Any help is much appreciated.

Attachments:
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http://files.engineering.com/getfile.aspx?folder=9...
http://files.engineering.com/getfile.aspx?folder=9...

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