仿真时显示错误
仿真时显示错误说是有一部分没有质量或者转动惯量，该怎么解决？求高手指点，是模型建的有错还是什么原因？在导入pro/engeer模型时出现错误说内存不足，但是最后也导进去了？最后的装配是不是和这个错误有关呀？求高手们给小弟解决一下，不胜感激！！！！！
---- ERROR ----
The system matrix has a zero pivot for column 40, which is associated
with PART/6 X.Consequently, the matrix is numerically singular.
The four most likely causes are:
1) The system includes a zero (or relatively small) mass on a
part with an unconstrained translational degree of freedom.
Suggested course of action:Make sure you have mass on all
parts with translational degrees of freedom.If you already have
mass on all the parts with translational degrees of freedom, look
at the equation and variable with the largest errors at the
time of the singularity.This may help you identify a
problematically small mass.(If your message file does not
contain information about the equation and/or variable with the
largest error at the time of the singularity, you can use
DEBUG/EPRINT to obtain this information.)
2) The system includes a zero (or relatively small) inertia
on a part with an unconstrained rotational degree of freedom.
Suggested course of action:Make sure you have inertias on all
parts with rotational degrees of freedom.If you already have
inertias on all the parts with rotational degrees of freedom, look
at the equation and variable with the largest errors at the
time of the singularity.This may help you identify a
problematically small inertia.
3) The system has become over constrained.In other words, the
number of degrees of freedom has decreased, and the mechanism
may have become locked up.
Suggested course of action:Look carefully at the graphic
display of the system configuration at the time of the
singularity to see if a lock up occurred.
4) An ADAMS element has a function expression that equals
exactly itself.For example,
SFORCE/id1,I=id2,J=id3,ROT,FUNC=SFORCE(id1,jflag,comp,rm),
and DIFF/id4,IMPLICIT,IC=0,FUNC=DIF1(id4).Similarly,
VARIABLE/id5, FUNC=VARVAL(id5)*TIME equals itself at 1 second.
Suggested course of action:Avoid setting an ADAMS element
equal to itself.
GTMODE:NUMB_DOFS
这是错误提示
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