1、几何清理
清除不必要的细小特征：孔倒角
调用多个ＣＰＵ
2、由点确定矢量方向
3 RROR # 2502
A fatal error has been detected during input processing:
*** ERROR # 2502 ***
Element 549700 had incorrect node numbering sequence and needs renumbering. ***** ERROR ENCOUNTERED BEFORE COMPLETING THE CHECK RUN *****
(1) 一般发生在修改网格之后，再删除原来的网格的时候没有将element549700删掉，使得该单元上的节点与后来划分的网格的节点出现矛盾冲突；先利用find id=549700删掉该单元
Save found -----F5-mask------retrieve(选择保存的)------reverse(反选)------mask----只显示549700单元了
4 *** ERROR # 1237 ***
CHEXA element number 26323 references a missing property ID 23 or uses property of incorrect type for this element type. （1）由于property ID 23（23号属性定义有问题），没有定义一个正确的单元类型；
（2） 这个地方容易没有填，注意注意
（3）网格划分的质量也有可能出现这个问题，重新划分网格可以消除该错误。（网格画小）
5*** ERROR # 2203 ***
Error(s) encountered during element check
***** Element Quality Check Failed - error limits violation *****
NOTE : To bypass element quality checks (except essential validity checks) use PARAM,CHECKEL,NO. This may, however, cause very poor results. （1）单元质量不好
6 *** ERROR # 312 ***
In static load case 1
the compliance is negative or large 1.875471E+13 Optimization/buckling analysis cannot be performed due to possible rigid body mode
FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED). (1)弹簧没建好；网格划分的不好节点不重合
7 *** FATAL ERROR # 8111 ***
vfileio:: Failed write for file[0], i/o 16384/0,
name=./dl32_DESIGN_TRUE_3load_parame_2624_00.scr. This is likely caused by insufficient disk space
*** ERROR # 151 ***
Error accessing the scratch files:
error encountered in subroutine \