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[求助]
AYSYS中怎么施加不同模态施加阻尼比呢？ 已有1人参与
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| ANSYS中使用的多是用定值阻尼比，如果我知道了不同阶阵型的阻尼比，请问在ANSYS要怎么加呢？ |
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在workbench中可以通过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. 输入阻尼随频率变化表 在MAPDL中，需要通过table进行设置，然后再定义 When specifying frequency dependent damping using TB,SDAMP you must specify the material property using TB,ELAS. 如果针对每一阶模态，用下面的命令，看帮助很容易，V1...代表不同阶次，大于6个模态的话，STLOC每次+6，第一次是1开始，第二次是7，第二次用的时候，V1就代表第7阶了 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). 简单的案例如下 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 |
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