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2024 (1)

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Dissertation
Comparing high-fidelity and simplified finite element models for dynamic analysis of satellite honeycomb sandwich panels

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Abstract

Honeycomb sandwich panels are extensively employed in satellite structures due to their exceptional strength-to-weight ratio and energy absorption capabilities. Accurate modeling and dynamic analysis of these panels are essential for ensuring the structural integrity and performance of satellites during launch and operation. High-fidelity finite element models that capture the detailed geometry and layered construction of honeycomb sandwich panels often require significant computational resources, especially for large-scale or complex structures. This thesis investigates the trade-offs between high-fidelity and simplified finite element models for dynamic analysis of satellite honeycomb sandwich panels, aiming to lay out simplified modeling techniques that maintain accuracy while reducing computational costs. The research focuses on justifying the simplifications made from the detailed honeycomb panel to a more simplified but still complex model through various finite element model feature-level sensitivity analyses aka trials. Several trials are conducted to determine the simplifications that can be made to the meshing of the high-fidelity honeycomb model without significantly impacting the modal analysis results, leading to easier meshing and reduced computational costs. The simplified model is developed to ensure minimal differences in results compared to the high-fidelity model for multiple dynamic analyses, and the computational costs of these models are compared to investigate factors influencing their efficiency. The findings contribute to the development of efficient and accurate modeling techniques for satellite honeycomb sandwich panels, enabling more reliable and cost-effective dynamic analysis during the testing phases. By understanding the trade-offs between model fidelity and computational efficiency, engineers can make informed decisions regarding the appropriate modeling approach, leading to improved structural performance and reduced development and computational costs. The scope of the study is limited to linear elastic behavior and focuses on dynamic analyses such as modal analysis, quasi-static analysis, sine vibration, and random vibration analysis. The research is conducted using Femap, which uses the Nastran solver and Patran pre- and post-processor, and the results may not be directly applicable to other software packages.

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