优化困惑，多谢高手帮忙！

谢谢分享!

厚度优化:实常数C

一下为删除冗余命令的程序，/BATCH
/COM,ANSYS RELEASE 10.0 UP20050718 09:20:32 05/29/2007
/input,menust,tmp,’’,,,,,,,,,,,,,,,,1
/GRA,POWER
/GST,ON
/PLO,INFO,3
/GRO,CURL,ON
/CPLANE,1
/REPLOT,RESIZE
WPSTYLE,,,,,,,,0

*SET,c,0.001
*SET,smax,1.55e8
　　
/PREP7
ET,1,SHELL181
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,2.07e11
MPDATA,PRXY,1,,0.28

K,1,0,0,-0.055,
K,2,0,0,-0.035,
K,3,0,-0.060,-0.035,
K,4,0,-0.06,0.035,
K,5,0,0,0.035,
K,6,0,0,0.055,
K,7,0.35,0,0.055,
LSTR, 6, 5
LSTR, 5, 4
LSTR, 4, 3
LSTR, 3, 2
LSTR, 2, 1
LSTR, 6, 7
LFILLT,1,2,0.01, ,
LFILLT,2,3,0.01, ,
LFILLT,3,4,0.01, ,
LFILLT,4,5,0.01, ,
FLST,2,9,4,ORDE,4
FITEM,2,1
FITEM,2,-5
FITEM,2,7
FITEM,2,-10
LCOMB,P51X, ,0
ADRAG, 1, , , , , , 6
TYPE, 1
MAT, 1
REAL,
ESYS, 0
SECNUM,
LESIZE,ALL,0.004, , , ,1, , ,1,
CM,_Y,AREA
ASEL, , , , 1
CM,_Y1,AREA
CHKMSH,’AREA’
CMSEL,S,_Y
MSHKEY,1
AMESH,_Y1
MSHKEY,0
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
R,1,c, , , , , ,
RMORE, , , , , , ,
FINI
WPSTYLE,,,,,,,,0
RESUME
ALLSEL,ALL
D,P51X, ,0, , , ,ALL, , , , ,
FLST,2,55,1,ORDE,2

D,P51X, ,0, , , ,UX,ROTY,ROTZ, , ,
FLST,2,275,1,ORDE,112
DDELE,P51X,ALL
ALLSEL,ALL
NSEL,S,LOC,X,0，0
DSYM,SYMM,X, ,
CM,_Y,ELEM
ESEL, , , ,P51X
CM,_Y1,ELEM
CMSEL,S,_Y
CMDELE,_Y
SFE,_Y1,1,PRES, ,-87000, , ,
FINISH
SOLVE

SET,LAST
ETABLE, ,VOLU,
AVPRIN,0, ,
ETABLE, ,VOLU,
SSUM
*GET,tvolu,SSUM, ,ITEM,VOLU
PRNSOL,S,PRIN
NSORT,S,EQV,0,0, ,0
NSEL,S,LOC,X,0,0.345
*GET,stressm,SORT,,MAX

/OPT
OPANL,’liangopt’,’lgw’,’ ’
OPVAR,C,DV,0.0005,0.002, ,
OPVAR,STRESSM,SV,1e6,SMAX,0.0001,
OPVAR,TVOLU,OBJ, , ,1E-7,
OPDATA, , ,
OPLOOP,TOP,IGNO,SCAL
OPPRNT,OFF
OPKEEP,ON
OPTYPE,FIRS
OPFRST,30,30,10,
OPEXE

优化前的分析正常，优化run时出错。。
另外我做其他优化，可以算3步，好像也得到最优解了，但出现错误说Z1、Z2、Z3未定义，可我没用他们呀，怎么回事呢 。多谢解疑！！

能计算马？优化问题主要是参数提取，然后选择优化算法等问题，你这个问题应该还在模型和参数提取方面的问题