安全带分析计算出错

wyons

我在ansys中做了一个安全带的例子，之后转道femb中去加上卷收器，滑环，预紧装置。再写出来.k格式，进行计算，老出错。
请了解安全带和熟悉ladyna的高手指点。

belldingding

*** Error - in seat belt initialization
            initial length less than 1.6 * minimum length
            and element is connected to a slipring
  
*** Error - in seat belt initialization
            initial length less than 1.6 * minimum length
            and element is connected to a slipring
  
*** Warning   massless nodes
    The following massless nodes were found
  
               node #      45800
               node #      45801
               node #      45802
               node #      45803
               node #      46546
               node #      46547
               node #      46555
               node #      46556
               node #      46620
  
  total number of massless nodes=    9
  
  The LS-DYNA time step size should not exceed     0.104E-04
  to avoid contact instabilities.  If the step size is
  bigger then scale the penalty of the offending surface.
  
  initialization completed with       3 fatal errors
  
所以要修改相应的参数啦

wyons

seat belt initialization  
            initial length less than 1.6 * minimum length ?
不太明白这个意思？
必须达到这个要求吗？