整车仿真问题.急!

njazxy

Performing Static analysis...
   Generating the Jacobian matrix for the statics or quasi-statics problem.
  
   Jacobian Matrix Statistics for Statics
   ======================================================
   Number of equations ............. = 1900
   Number of non-zero entries ...... = 15355
   Percentage of matrix non-zero ... = 0.42535
   Total space used in MD array .... = 826512
  
  
  
  
  
---- ERROR ----
   Attempt = 1. No convergence after 25 iterations. Best iteration = 1.
   Trying next attempt with a different set of statics parameters...
  
   For the last attempted iteration the equation with the largest error
   was PART bb_ilc.FRONTSUSPENSION.gel_uca  Error = 4.33913E+06
  
   The variable receiving the largest increment
   was FIELD bb_ilc.FRONTSUSPENSION.bgl_uca_rear.field  Delta = 1.84249E+07
---- ERROR ----
   Static equilibrium analysis has not been successful.
   Restoring the input initial conditions...
   
   acar_2008.1.0/vdm::apre_fvbcsb
   **** Error:
   
         Sim/stat cannot be achieved.
---- ERROR ----
   Aborting Execution.
   Terminating Adams/Car usersubs...
  
      Adams/Solver execution terminated by subprogram ERRMES
  
   CPU time used = 4.0469 seconds
WARNING: The request file contains no time-dependent data.
Simulation is complete.



这是我做ISO仿真时候的错误信息...我尝试着改变solver中equilibrium的误差,也解决不了...
拜托高手帮我看看..谢谢

njazxy

我将equilibrium从static改为dynamic之后,仿真报以下错误


---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_rear.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ -9.65019E-02, -0.25178, -0.24836 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_front.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ 9.65019E-02, -0.25178, 0.24836 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_rear.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ -0.12037, -0.30382, -0.26188 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_front.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ 0.12037, -0.30382, 0.26188 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_rear.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ -0.15151, -0.36655, -0.27854 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_front.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ 0.15151, -0.36655, 0.27854 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_rear.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ -0.18349, -0.42592, -0.29475 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_front.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ 0.18349, -0.42592, 0.29475 ]

   Symbolic refactorization attempted at time = 6.7202.

   Generating the Jacobian matrix for the displacements and velocities.

   Generating the Jacobian matrix for the accelerations and forces.

   Generating the Jacobian matrix for the dynamics problem.

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_rear.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ -0.22429, -0.49470, -0.31431 ]

---- WARNING ----
   FIELD vvv_ilc.FRONTSUSPENSION.bgr_uca_front.field is violating the assumption of small angles.
   Angle Limit = 0.20, Angles = [ 0.22429, -0.49470, 0.31431 ]

   During the simulation,large angles have been detected 10 times for
   FIELD, BEAM, or BUSHING elements. Adams will not warn for large
   angular deformations any more. Simulation continues ...
  

   Symbolic refactorization attempted at time = 6.7202.

   Generating the Jacobian matrix for the displacements and velocities.

   Generating the Jacobian matrix for the accelerations and forces.

   Generating the Jacobian matrix for the dynamics problem.

   Symbolic refactorization attempted at time = 6.7202.

   Generating the Jacobian matrix for the displacements and velocities.

   Generating the Jacobian matrix for the accelerations and forces.

   Generating the Jacobian matrix for the dynamics problem.

---- WARNING ----
   The corrector has not converged after 1 attempts. No. of iterations = 10.

   The system has 54 kinematic degrees of freedom.

---- ERROR ----
   The simulation is terminating at time = 6.7203.
  
   Adams can not solve the equations of motion because the mechanism has
   "locked up."    At least one constraint  can  no longer be satisfied.
   Adams is unable to satisfy the constraint for: JOINT vvv_ilc.fsae_powertrain.jksfix_rigid_engine_mount .

---- ERROR ----
   SIMULATE command failed for minimaneuver: LANE_CHANGE
   Aborting Execution.

   Terminating Adams/Car usersubs...

  
      Adams/Solver execution terminated by subprogram ERRMES
  

   CPU time used = 49.062 seconds
Simulation is complete.


大家看看..是什么原因?

zhulibin2009

静平衡里有个设置初始角位移（Alimit）的，你把它设置小点试试，默认的为10

njazxy

我把ALIMIT和TLIMIT都改小了,甚至把ERROR和IMBALANCE都放大很多,都没有成功..是不是模型建立有问题?如果整车质量和转动惯量设置的不对的话..会出现这种问题吗?

advancej

把仿真时的步长设置小点试试  ，昨天还看见一个教怎么设置solver的帖子，标题里好像有个解决lock up 问题的

advancej

这个帖子，你自己看一下 http://forum.simwe.com/thread-927104-1-2.html

lishifeng

应该是模型自己的问题