关于ADAMS/CAR整车建模问题
最近在搞整车运动仿真问题，完成了一辆车前后悬架建模，以及K&C特性都完成了，没有问题，完成静平衡调节。组装好整车所需的所有子系统，没有任何连接错误的通讯器。但是却没法执行整车仿真，连整车静平衡都达不到？？求高手指点！！！ 这种最好把模型发生来，高手提交计算一下子就帮你看出问题来了。 我也要，我要建四轴的 哪位高手能指点啊运算错误报一下也好帮你分析一下原因 高手啊，还要学习 我要搞五连杆，悲剧了{:3_50:} wangxinboy32 发表于 2012-2-20 23:23 static/image/common/back.gif
运算错误报一下也好帮你分析一下原因
Reading in property files...
Reading of property files completed.
Setting up assembly for analysis of loadcase: 'parallel_travel'...
Writing analysis information to Adams/Solver command file: 'my_load_parallel_travel'.
Simulation(s) are beginning...
*********************************************************************
* *
* MSC.Software Corporation *
* *
* A d a m s *
* *
* Automatic Dynamic Analysis of Mechanical Systems *
* *
* A d a m s / S o l v e r *
* *
* 2012-03-08 13:34:59 Version MD R3 *
* *
* Customer Entitlement ID: 190635EF-8A3E7DED *
* *
*********************************************************************
Enter ADAMS model file name or Carriage Return or ? (or STOP):
No model input file (ADM file) is given.
Enter Command:
file/model=my_load_parallel_travel
A new model supplied.Initialization starts...
The default input and analysis values will be restored.
CPU time used = NaN seconds
Enter ADAMS model file name or Carriage Return or ? (or STOP):
Enter ADAMS output file name or ? (default is same as input):
Adams model file .. my_load_parallel_travel.adm
Default file names for output files
Tabular output file:
my_load_parallel_travel.out
Diagnostic file :
my_load_parallel_travel.msg
Message Database file :
my_load_parallel_travel.mdb
Graphics file :
my_load_parallel_travel.gra
Request file :
my_load_parallel_travel.req
Results file :
my_load_parallel_travel.res
Input Phase - Reading in Model
***********************************************************
Adams/Solver dataset Title:
Adams/Car Assembly (MD Adams R3)
***********************************************************
Reading of model complete.
Adams/Car MD Adams R3
Processing ENVIRONMENT entries in 'd:\MSC.Software\MD_Adams\R3\acar/acar.cfg'
Processing ENVIRONMENT entries in 'C:\Documents and Settings\Administrator/.acar.cfg'
=================================================================
Adams/Tire
Version MD Adams R3
=================================================================
Input Phase - Populating Solver database
Input Phase Complete.
CPU time is 0.68750 seconds.
acar_2008.1.0/ac_scc_init
Reading ARRAY parameters using the
ADAMS/Car array statement definitions.
acar_2008.1.0/ac_scc_init
Checking ARRAY parameters...
Input and Input Check Phase complete.
The system has 48 kinematic degrees of freedom.
Enter Command:
preferences/solver=F77
Enter Command:
control/ routine=acarSDM::con950, function=user(950,29,31,1,2,17,19,1,3,2,3,28,30,2,3,28,30,1,1)
Entering the static equilibrium analysis phase...
Displacement initial condition analysis...
Jacobian Matrix Statistics for the Initial Conditions
======================================================
Number of equations ............. = 384
Number of non-zero entries ...... = 2302
Percentage of matrix non-zero ... = 1.5611
Total space used in MD array .... = 254648
Symbolic refactorization attempted at time = 0.0.
The system has 48 kinematic degrees of freedom.
---- ERROR ----
Symbolic refactorization failed.The matrix is structurally singular
at time = 0.0.
Symbolic refactorization attempted at time = 0.0.
The system has 48 kinematic degrees of freedom.
---- ERROR ----
Symbolic refactorization failed.The matrix is structurally singular
at time = 0.0.
---- WARNING ----
On iteration 1, the Jacobian matrix for the initial values of
the displacements (for the assembly analysis) is singular, a condition
usually caused by over specification of EXACT coordinates.Since
Adams/Solver employs a penalty-function method to assemble the mechanism,
the approach becomes less effective as more and more EXACT initial
conditions are specified.If the user labels too many initial values
as EXACT, the Jacobian matrix can become ill-conditioned or even
singular.Although the analysis will continue, the simulation could
fail or produce inaccurate results due to inconsistent initial conditions.
Performing Static analysis...
Generating the Jacobian matrix for the statics or quasi-statics problem.
Jacobian Matrix Statistics for Statics
======================================================
Number of equations ............. = 975
Number of non-zero entries ...... = 8430
Percentage of matrix non-zero ... = 0.88679
Total space used in MD array .... = 408348
Symbolic refactorization attempted at time = 0.0.
---- WARNING ----
The symbolic refactorization failed.The matrix is structurally singular
at time = 0.0.
---- ERROR ----
Static equilibrium analysis has not been successful.
Restoring the input initial conditions...
---- ERROR ----
Initial Static Sim. Not Successful
Terminating Adams/Car usersubs...
Adams/Solver execution terminated by subprogram ERRMES
CPU time used = 1.4219 seconds
Analysis failed!
Please check the error messages to determine the cause.能帮我分析一下么 各位大哥，从proe导入adams/car 模板模式下的part，能否转换成general part啊 帮不上忙啊…… wangxinboy32 发表于 2012-2-20 23:23 static/image/common/back.gif
运算错误报一下也好帮你分析一下原因
你好可否帮忙看一下这是什么原因老是仿真失败
Performing Static analysis...
Generating the Jacobian matrix for the statics or quasi-statics problem.
Jacobian Matrix Statistics for Statics
======================================================
Number of equations ............. = 1634
Number of non-zero entries ...... = 15401
Percentage of matrix non-zero ... = 0.57683
Total space used in MD array .... = 707612
Symbolic refactorization attempted at time = 0.0.
---- ERROR ----
Attempt = 1. No convergence after 25 iterations. Best iteration = 8.
Trying next attempt with a different set of statics parameters...
For the last attempted iteration the equation with the largest error
was DIFF example_drift.testrig.sse_diff1Error = 1659.2
The variable receiving the largest increment
was VARIABLE example_drift.testrig.vas_brake_demand.variableDelta = 1.65920E+08
---- ERROR ----
Static equilibrium analysis has not been successful.
Restoring the input initial conditions...
---- ERROR ----
Sim/stat cannot be achieved ...Stopping in <apre_ssssta>
ID = 1020
Terminating Adams/Car usersubs...
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