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基于優(yōu)化的蜂窩板有限元模型修正

Honeycomb panel model updating based on optimization

  • 摘要: 蜂窩板具有較高的比強(qiáng)度和比剛度，在航空航天領(lǐng)域得到廣泛應(yīng)用。用三明治等效方法計算蜂窩板等效材料參數(shù)，在MSC.Patran中建立有限元模型計算蜂窩板基頻，通過分析設(shè)計變量和目標(biāo)函數(shù)在NASTRAN中對蜂窩板基頻進(jìn)行優(yōu)化，利用優(yōu)化結(jié)果確定等效剪切彈性模量計算公式中修正系數(shù)γ并重新計算修正后模型基頻，以試驗所測基頻值為標(biāo)準(zhǔn)對蜂窩板有限元模型進(jìn)行修正。修正后模型計算基頻值與實測值之間的偏差明顯減小，證實了模型修正的有效性。

     

    Abstract: The honeycomb panel, due to its high specific strength and stiffness, is widely used in aeronautical, ABSTRACTS OF THE PRESENT ISSUE astronautical and other fields. The equivalent material parameters are calculated using the sandwich equivalent method, The finite element model (FEM) is set up in MSC.Patran to calculate the first order frequency of the honeycomb panel, which is optimized in Nastran by analyzing the design variable and the objective function, and the optimized result is used to confirm the equivalent modulus of elasticity in shear, which is used to recalculate the first order frequency of the FEM, then the FEM of the honeycomb panel is updated based on the test result. The error between the calculated and the test results is greatly reduced, which shows the validity of the model updating.

     

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