Development of reduced order model for dynamic analysis of aircraft via global optimization

Date

2023-8

Author

Köse, Oğuzhan

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Reduced models are often used in the early phases of aircraft design to shorten analysis times and contribute to the optimization process. In the final stages of aircraft design, reduced models are used to create the mathematical model of the aircraft after ground vibration tests. This thesis study explains the creation process of a reduced model, the beam stick model (BSM). The BSM reduces the 3-dimensional finite element model to 1-dimensional. BSMs can be used to estimate the loads on the aircraft or to reflect the dynamic characteristics of the aircraft. This study uses the global optimization method to create BSM of the METU Very Light Aircraft (VLA). The Crow Search Algorithm (CSA) is used as a global optimization method with specific updates. In addition, a new methodology has been developed when connecting control surfaces to lifting surfaces in the reduced order BSM. In the thesis, the detailed structural finite element model and the BSM's natural frequencies and mode shapes are compared. The modal analysis solver of the MSC NASTRAN finite element program is used to make this comparison. Then, flutter and gust response analysis are performed using the BSM, and the results are compared with the analysis results obtained with the detailed finite element model. It is seen that the results of the detailed finite element model and the BSM match very well. Dynamic aeroelasticity analyses should be repeated with many mass combinations due to the certification criteria of aircraft. For this reason, the response of the aircraft structure and the BSM to mass changes is expected to be the same. The modal analysis results of the mass change of the BSM and the detailed finite element model are also examined. It is observed that both models give similar responses. The analyses show that the proposed methodology to generate BSM can be used effectively and reliably in dynamic aeroelasticity studies.

Subject Keywords

Reduced order models, Beam stick model, Global optimization, Aeroelasticity, Dynamic response

URI

https://hdl.handle.net/11511/105291

Collections

Graduate School of Natural and Applied Sciences, Thesis