| Citation: | SUN Xuedong, SUN Wei, ZHANG Rongfei, et al. Finite element modeling and vibration analysis of the orthogonal stiffened cylindrical shell based on region segmentation method[J]. Journal of Aerospace Power, 2025, 40（11）：20230783 doi: 10.13224/j.cnki.jasp.20230783
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Taking the orthogonal stiffened cylindrical shell as the research object, a finite element modeling method based on region segmentation method was proposed to address the accuracy limitations of traditional stiffener modeling methods in analyzing vibrations of non-uniformly stiffened shells. By dividing the stiffened shell into six regions, the stress-strain relationships and element stiffness matrices for each region were derived, and elastic boundary conditions were incorporated to establish the dynamic finite element equations for the orthogonal stiffened cylindrical shell. Case studies demonstrated that under fixed and elastic constraints, the maximum relative differences of natural frequencies predicted by the region segmentation method compared with ANSYS and experimental results were 3.67% and 4.67%, respectively, with modal assurance criteria exceeding 0.90. Additionally, the computational efficiency was improved by 1.3 times over the smeared stiffener method and nearly 8 times over ANSYS. Parametric analysis further revealed that skin thickness significantly affected natural frequencies, while the thickness of longitudinal stiffeners and the width of circumferential stiffeners could play more prominent roles in influencing the natural frequencies.
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