Structural design, topology and multi objective optimization of wing kit of munition utilizing lattice cell structures

Date

2024-4-16

Author

Aksoy, Buğra

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In this thesis study, optimization of compliance and mass is performed using lattice cell structures for a three-point bending test specimen and wing kit of munition through multi-objective optimization methods. In the first stage, strut-based lattice structures are placed inside the three-point bending specimen. Optimization of strut diameters is carried out with single and multiple design variables. The performance of the entire structure is compared in terms of single or multiple design variables. In the second stage, the design space of the wing kit of munition is defined. Strut-based lattice cells are placed in the design space, which is optimized using the Solid Isotropic Material with Penalization (SIMP) method. Here, the objective function aims to minimize compliance, with the response constraint set to reducing the volume of the design space by 50%. If the relative density of 3D elements is less than 40%, lattice structures are placed; otherwise, it is retained as a solid element. Subsequently, the strut diameter of the lattice is optimized using multi-objective optimization. After preparing the finite element model in HyperMesh, the HyperStudy program is employed for diameter optimization. A Python code has been developed to facilitate the transfer of the finite element model from HyperMesh to HyperStudy parametrically. Finally, another Python code has been developed to prepare a model in the Catia V5 program based on the results obtained after completing multi-objective optimization, and specimens are produced. This thesis demonstrates the application of optimized lattice structures in the field of engineering through multi-objective optimization method, exemplified by a three-point bending test specimen and the wing of an ammunition kit. Based on the results obtained, the performance of the optimized three-point bending specimen and ammunition wing constructed with lattice structures is enhanced in terms of mass and stiffness objective functions.

Subject Keywords

Strut-based lattice structure, Multi-objective optimization, Topology optimization, Extendable wing for guided missiles and munitions

URI

https://hdl.handle.net/11511/109496

Collections

Graduate School of Natural and Applied Sciences, Thesis