请教adams2005做李军整车模型的一些经验！

zhangwanzhi

我用adams2005做李军整车模型，建立的整车模型没有问题，但按照书上的步骤加载驱动以及力矩后，仿真却出现了问题！请问各位大侠，是哪出了问题？？我觉得书上的步骤可能有问题，但不知道如何修改！！请高手指点一下！！

zhangwanzhi

我看网上有介绍按照下面的步骤做，但做完以后仍然不正确啊！


轮胎和车体之间的约束。这个问题在李军的书中没有提到，但若不添加约束，会导致仿真开始时轮胎和车身脱离。常用方法是在车轮和悬架之间添加旋转副（Revolute Joint），选择“1 location”和“Normal To Grid”，注意要保证旋转副的旋转方向和车轮转动方向一致。
.轮胎旋转力矩的添加。为了能使小车动起来，需要在两后轮胎上添加力矩。具体方法是：首先点选工具箱中的力元Torque Force，再选择轮胎为主动物体，Left_RCA为受动物体（以左后轮胎为例），接下来选择Right_RCA_MARKER_89为主动点，Ground_Left_RCA_outer为受动点。（总之，要保证部件要一个选Tire，一个选RCA，Marker点一个选Ground上的点，一个选RCA上的点，道理很简单：把力矩添加在同一部件上是起不到作用的。）



是不是另外哪些方面的出了问题呢？？？？

zhangwanzhi

按照上面的步骤做，刚开始小车摇摆不定地向后跑，模型好像也变形了，几秒以后，却又提示出现错误


WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5_2 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5_2 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5_2 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5_2 are non-parallel.
   Results may be incorrect.
WARNING:    The z-axes of the markers defining SFORCE JEEP.SFORCE_5 are non-parallel.
   Results may be incorrect.
WARNING:    The symbolic refactorization failed.  The matrix is structurally singular
   at time = 5.6437.
WARNING:    The corrector has not converged after 1 attempts. No. of iterations = 10.
WARNING:    The corrector has not converged after 1 attempts. No. of iterations = 10.
WARNING:    The corrector has not converged after 1 attempts. No. of iterations = 20.
ERROR:      The simulation stopped at time = 5.6437 .  ADAMS cannot solve
   the equations of motion.
  
   The greatest error in an equation is 3.88432E+06 in the
   equation for GFORCE JEEP.tie04.force .
  
   The greatest change in a variable is 1.38717E-08 in the
   variable for PART JEEP.tie03.wheel_part .
  
   Try the following in this order:
       1.  Use the MAXIT argument on the EQUILIBRIUM, IC, KINEMATICS,
           or INTEGRATOR command to increase the maximum number of
           iterations.
       2.  Temporarily change the value of the PATTERN argument on the
           EQUILIBRIUM, IC, KINEMATICS, or INTEGRATOR command to
           PATTERN = T.
       3.  Temporarily increase the value of the ERROR argument on the
           EQUILIBRIUM, IC, KINEMATICS, or INTEGRATOR command at
           time = 5.6437 .
       4.  If one or more forces change rapidly or sharply near
           time = 5.6437, modify the force or forces.
  
ERROR:   Simulation failure detected

zhangwanzhi

这个问题已经解决了！我的小车可以跑了，哈哈，高兴 啊！！

北极熊

怎么解决的为什么不说说呢, 把高兴和大家分享!

zhangwanzhi

5# 北极熊
小车的悬架和车轮之间的旋转副的方向，我刚开始加错了！把方向改过来，就可以了！！！我还只是个菜鸟，以后还请多多帮助啊！

wangjunjie0536

我也遇到了这样的问题，

   The z-axes of the markers defining SFORCE chengdu_line1_2_dyn.chengdu_line1_bogie_ues_AROLLBAR_force are non-parallel.
   Results may be incorrect.
求高手指点一下！

骑着乌龟飙车

李军的整车模型我运行不起来一直出现如下错误
Failure to satisfy velocity initial conditions.  A probable cause is an over-specification of initial velocities of bodies.  Please specify fewer initial velocities and try again
该怎么解决