Design, modeling and multi-objective optimization of a non-pneumatic tire using an auxetic anti-tetrachiral metamaterial lattice structure

Πατσούρας, Δημήτριος; Patsouras, Dimitrios

dc.contributor.author	Πατσούρας, Δημήτριος	el
dc.contributor.author	Patsouras, Dimitrios	en
dc.date.accessioned	2025-03-19T09:48:27Z
dc.date.available	2025-03-19T09:48:27Z
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/61360
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.29056
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Non pneumatic tire	en
dc.subject	Finite element analysis	en
dc.subject	Optimization	en
dc.subject	Stiffness evaluation	en
dc.subject	Μη πνευματικό ελαστικό	el
dc.subject	Βελτιστοποίηση	el
dc.subject	Ανάλυση πεπερασμένων στοιχείων	el
dc.subject	Lattice structure	en
dc.subject	Δυσκαμψία	el
dc.subject	Υπερελαστικό υλικό	el
dc.title	Design, modeling and multi-objective optimization of a non-pneumatic tire using an auxetic anti-tetrachiral metamaterial lattice structure	en
heal.type	bachelorThesis
heal.secondaryTitle	Σχεδιασμός, Μοντελοποίηση και Πολυκριτηριακή Βελτιστοποίηση Μη Πνευματικού Ελαστικού με χρήση Αυξητικής Δομής Μεταϋλικού	el
heal.classification	Computational Tire Mechanics	en
heal.language	en
heal.access	campus
heal.recordProvider	ntua	el
heal.publicationDate	2024-09-23
heal.abstract	The current Diploma Thesis treats the design, modeling and optimization of a non-pneumatic tire (NPT) featuring an auxetic anti-tetrachiral metamaterial lattice structure. The primary aim is to enhance the tire's performance through a combination of finite element analysis (FEA) and multi-objective optimization, with particular emphasis on stiffness characteristics and inertia. The research contributes to the development of advanced non-pneumatic tires by introducing a detailed and sufficient framework for modeling, optimizing, and validating such structures using modern computational tools and experimental data. At first, an initial anti-tetrachiral lattice NPT design is presented and modeled using a high-fidelity FEA model in ANSYS that incorporates structured hexahedral meshing, nonlinear contact definitions, and the modeling of the tire’s composite layers using homogenized anisotropic material. This model enables the precise characterization of the behavior of the tire, with a specific focus on the in-plane and out-of-plane stiffness properties. Furthermore, multi-objective optimization is employed to achieve two primary objectives: maximizing the combined in-plane and out-of-plane RVE stiffness while minimizing the tire’s inertia. This multi-objective optimization is carried out in MATLAB, using linear geometric constraints to ensure a structurally feasible design. Afterwards, the optimized design is re-evaluated as a full tire geometry, using the high fidelity FEA model developed earlier. The optimized NPT is subsequently validated through experiment-driven simulations. Uniaxial mechanical testing is conducted using 3D printed representative volume elements (RVE) of the anti-tetrachiral lattice structure. Then, a hyperelastic material model is utilized to ensure accurate material representation within the FEA framework. The static characteristics of the optimized tire, including vertical stiffness, lateral stiffness, contact area, and contact pressure, are evaluated and compared to the initial design. Simultaneously, the experiment-driven simulation results are compared to the optimized FEA results, showcasing very high equivalence. Last but not least, modal FEA analysis is conducted to identify the tire’s natural frequencies and mode shapes, with a specific focus on low-frequency rolling modes that may limit the tire’s performance at higher speeds. To mitigate the resonance issues observed, a parametric modal analysis is performed, followed by a secondary round of multi-objective optimization aimed at improving the tire's dynamic behavior. The resulting design demonstrates significant advancements in both static and dynamic performance, offering valuable insights into the optimization and development of non-pneumatic tires. The Thesis concludes by discussing the broader implications of these findings and outlining potential directions for future research in non-pneumatic tire mechanics and metamaterial applications.	en
heal.advisorName	Σπιτάς, Βασίλειος	el
heal.committeeMemberName	Σπιτάς, Βασίλειος	el
heal.committeeMemberName	Κουλοχέρης, Δημήτριος	el
heal.committeeMemberName	Αντωνιάδης, Ιωάννης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Μηχανολόγων Μηχανικών. Τομέας Μηχανολογικών Κατασκευών και Αυτομάτου Ελέγχου. Εργαστήριο Στοιχείων Μηχανών	el
heal.academicPublisherID	ntua
heal.numberOfPages	131 σ.	el
heal.fullTextAvailability	false