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求指点，压电材料PSD随机响应，应力电压结果数值巨大，为什么 ...
我最近做的一个结构的压电材料的力学和压电性能的分析，正在做随机载荷谱下的响应，可是得到的应力和电压的数值巨大，不知为何？请高人指点一下。下面是PSD部分的代码，建模省略了。代码中的ntip1,ntip2,....ntip5是5个我要看的节点，n_top1，n_top2，n_top3，n_top4，n_top5是五处的电压，结果位移结果是1600~2000，电压是1600e4~3500e4，这是不可能的。求高人帮忙啊
/prep7
..............建模
fini
/SOLU
!!!!!!!!!!!!!!!!下面进行随机振动的PSD分析
ANTYPE,MODAL
MODOPT,LANB,10
!EQSLV,SPAR
MXPAND,10, , ,yes,,yes
LUMPM,0
PSTRES,0
MODOPT,LANB,10,0,3000, ,off
nsel,all
SOLVE
*GET,FREQ1,MODE,1,FREQ
*GET,FREQ2,MODE,2,FREQ
*GET,FREQ3,MODE,3,FREQ
*GET,FREQ4,MODE,4,FREQ
*GET,FREQ5,MODE,5,FREQ
*GET,FREQ6,MODE,6,FREQ
*GET,FREQ7,MODE,7,FREQ
*GET,FREQ8,MODE,8,FREQ
*GET,FREQ9,MODE,9,FREQ
*GET,FREQ10,MODE,10,FREQ
FINISH
!
! Obtain the Spectrum Solution
!/CONFIG,NRES,1000
/SOLU ! Reenter 再次求解SOLUTION
nsel,all
ANTYPE,SPECTR ! Spectrum analysis谱分析
!SPOPT,PSD,10,yes,yes ! USE FIRST 10 MODES FROM MODAL ANALYSIS Power Spectral Density功率谱密度; No. of modes;
SPOPT,PSD,,YES
PSDUNIT,1,ACCG,9.8!mm,mpa,t, unit system ! Type of spectrum谱类型 USE m**2/HZ FOR PSD AND DIMENSION IN INCHES
SED,0,0,1, !Defines the excitation direction for response spectrum and PSD analyses.
psdfrq,1,,2,10,30,100,200,400,500
psdval,1,0.01,0.01,0.001,0.001,0.005,0.005,0.0001
DMPRAT,0.02 ! Damping ratio阻尼比
MDAMP,1, , , , , , , !Defines the damping ratios as a function of mode.
D,root,UZ,1.0 ! Base excitation基础激励
PFACT, 1,BASE, ! Calculate participation factors计算参与系数
PSDRES,DISP,ABS
PSDRES,VELO,ABS
PSDRES,ACEL,ABS ! Output controls输出控制
PSDCOM,0.0001,10, ! Combine modes using PSD method 组合模态
nsel,all
SOLVE
finish
!
!
! Review the Results
/POST1 ! Enter POST1进入后处理
SET,list ! Read results from appropriate load step, substep
PLDISP,0 !Displays the displaced structure.
PLNSOL, S,EQV, 0,1.0 !Displays results as continuous contours.
PRNSOL ! (PLDISP; PLNSOL; NSORT; PRNSOL; etc.)
FINISH
!
! Calculate Response PSD求解随机响应
/POST26 ! Enter POST26
NUMVAR,200
FILLDATA,191,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,191,191 !Forms a variable using only the real part of a complex variable.
NSOL,2,ntip1,U,Z,UZ_1 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
/axlab,x, Frequency (Hz) ! 设置 X轴 标签 为Position (m)
/axlab,y, UZ_1 (m) ! 设置 X轴 标签 为Position (m)
plvar,2 ! 变量随频率变化图
FILLDATA,192,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,192,192 !Forms a variable using only the real part of a complex variable.
NSOL,3,ntip2,U,Z,UZ_2 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
/axlab,x, Frequency (Hz) ! 设置 X轴 标签 为Position (m)
/axlab,y, UZ_2 (m) ! 设置 X轴 标签 为Position (m)
plvar,3
FILLDATA,193,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,193,193 !Forms a variable using only the real part of a complex variable.
NSOL,4,ntip3,U,Z,UZ_3 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
/axlab,x, Frequency (Hz) ! 设置 X轴 标签 为Position (m)
/axlab,y, UZ_3 (m) ! 设置 X轴 标签 为Position (m)
plvar,4
FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,5,ntip4,U,Z,UZ_4 !Specifies nodal data to be stored from the results file.
STORE,MERGE
/axlab,x, Frequency (Hz) ! 设置 X轴 标签 为Position (m)
/axlab,y, UZ_4 (m) ! 设置 X轴 标签 为Position (m)
plvar,5 !Stores data in the database for the defined variables.
FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,6,ntip5,U,Z,UZ_5 !Specifies nodal data to be stored from the results file.
STORE,MERGE
/axlab,x, Frequency (Hz) ! 设置 X轴 标签 为Position (m)
/axlab,y, UZ_5 (m) ! 设置 X轴 标签 为Position (m)
plvar,6
FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,7,n_top1,VOLT, ,Volt_1 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,8,n_top2,VOLT, ,Volt_2 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,9,n_top3,VOLT, ,Volt_3 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,10,n_top4,VOLT, ,Volt_4 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
!FILLDATA,194,,,,1,1 !Fills a variable by a ramp function.
!REALVAR,194,194 !Forms a variable using only the real part of a complex variable.
NSOL,11,n_top5,VOLT, ,Volt_5 !Specifies nodal data to be stored from the results file.
STORE,MERGE !Stores data in the database for the defined variables.
FINISH
