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[求助] AYSYS中怎么施加不同模態(tài)施加阻尼比呢？已有1人參與

ANSYS中使用的多是用定值阻尼比，如果我知道了不同階陣型的阻尼比，請(qǐng)問在ANSYS要怎么加呢？

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1樓 2019-04-01 08:34:43

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【答案】應(yīng)助回帖

感謝參與，應(yīng)助指數(shù) +1

在workbench中可以通過analysis setting 中的 Stiffness Coefficient Defined By. Define the Stiffness Coefficient by entering a value, Direct, or by entering a Frequency and a Damping Ratio, Damping vs. Frequency.

輸入阻尼隨頻率變化表

在MAPDL中，需要通過table進(jìn)行設(shè)置，然后再定義
When specifying frequency dependent damping using TB,SDAMP you must specify the material property using TB,ELAS.

如果針對(duì)每一階模態(tài)，用下面的命令，看幫助很容易，V1...代表不同階次，大于6個(gè)模態(tài)的話，STLOC每次+6，第一次是1開始，第二次是7，第二次用的時(shí)候，V1就代表第7階了
MDAMP

MDAMP, STLOC, V1, V2, V3, V4, V5, V6
Defines the damping ratios as a function of mode.

SOLUTION: Dynamic Options

Valid Products: DesignSpace | Pro | Premium | Enterprise | PrepPost | Solver | AS add-on

STLOC
Starting location in table for entering data. For example, if STLOC = 1, data input in the V1 field applies to the first constant in the table. If STLOC = 7, data input in the V1 field applies to the seventh constant in the table, etc. Defaults to the last location filled + 1.
V1, V2, V3, . . . , V6
Data assigned to six locations starting with STLOC. If a value is already in this location, it will be redefined. Blank values for V2 to V6 leave the corresponding previous value unchanged.

Notes

Defines the damping ratios as a function of mode. Table position corresponds to mode number. These ratios are added to the DMPRAT value, if defined. Use the STAT command to list current values. This command applies to mode-superposition harmonic (ANTYPE,HARMIC), mode-superposition linear transient dynamic (ANTYPE,TRANS), and spectrum (ANTYPE,SPECTR) analyses. Repeat the MDAMP command for additional constants (10000 maximum).

簡單的案例如下
FINISH
/CLEAR

*ABBR,RUN,M1

/PREP7

ET,1,16
R,1,1,0.02

MP,EX,1,2E11
MP,DENS,1,7800
MP,NUXY,1,0.3

N,1
N,11,10
FILL

E,1,2
EGEN,10,1,-1

D,1,ALL

FINISH
/SOLU

ANTYPE,MODAL
MODOPT,LANB,10
MXPAND,10,,,YES,,NO

SOLVE

FINISH
/POST1

FINISH
/SOLU

ANTYPE,TRANS
TRNOPT,MSUP,6
MDAMP,1,0.01,0.01,0.01,0.01,0.01,0.01
! MDAMP,1,0.1,0.1,0.1,0.1,0.1,0.1
DELTIM,0.0001,0.0001,0.0001

F,11,FY,0
SOLVE

TIME,0.01
F,11,FY,-100
SOLVE

TIME,0.02
F,11,FY,0
SOLVE

TIME,1
SOLVE

FINISH
/POST26

FILE,FILE,RDSP
NSOL,2,11,U,Y
PLVAR,2

贊一下

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慢慢地，慢慢地，都隨風(fēng)而逝了......

2樓2019-04-01 11:30:45

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