【ABAQUS模态动力学】Material-Damping 对模态分析的影响

先说结论，执行Frequency Step （特征值提取）时定义材料行为中的Damping 行为，对结果没有影响。

1. abaqus calculation compare

1.1 ANALYSIS OBJECT

1.2 PRE-PROCESS

• Property
  • MATERIAL-1
    • density：1600 Kg/m^3
    • Structural Damping: 0.05
    • Young's modulus: 210 GPa
    • Poisson's ratio : 0.3
  • Section define
    • type: Solid, Homogenous
    • material:MATERIAL-1
  • Assign Section
    • assign MATERIAL-1 for Part-1
• Assembly
  • create independent instance
  • The rest default
• Step
  • create a Frequency step
    • turn off Nlgeom option
    • choose lanczos EIGENVALUE_SOLVER
    • extract the first 10 modes and the rest set default
  • Output Request
    • field output：U , S , E
    • history output：None
• Interaction
  • NONE
• Load
  • Cantilever Beam Displacement Boundary Condition: Constrains all degrees of freedom on one surface.
  • load: None
• Mesh
  • global Seed: 2
  • Mesh control: default(HEX,structual)
  • Element type: default(C3D8R)
• job
  • create job-1
  • The rest default

1.3 Post-PROCESS

1.3.1 Analysis results(including structural damping parameters)

1.3.2 Analysis results( delete structural damping parameters)

1.3.3 Conclusion

对比两种情况的下的特征值和特征频率求解结果，可见abaqus frequency分析步计算时阻尼参数对计算结果没有影响，因为求的是无阻尼固有频率。

3. 参考资料

• abaqus help document 2020
• 《结构动力学》