https://repositorio.ufu.br/handle/123456789/19234 2026-08-13T20:24:59Z 2026-08-13T20:24:59Z https://repositorio.ufu.br/handle/123456789/49039 2026-07-25T06:27:15Z 2025-09-30T00:00:00Z

Title: Artificial neural networks for critical flutter speed prediction in semi-span flat-plate wings with geometric variations

2025-09-30T00:00:00Z https://repositorio.ufu.br/handle/123456789/47947 2025-12-30T06:18:13Z 2025-11-06T00:00:00Z

Title: Estudo do comportamento termomecânico de ferramentais de montagem de estruturas aeronáuticas Abstract: The present work investigates the thermomechanical behavior of assembly tooling for flight critical components, focusing on control surfaces and the effects of thermal expansion on product tolerances. The analysis carried out is extremely useful for assembly processes located in thermally uncontrolled environments. Temperature measurements were performed on the assembly jigs of control surfaces from two aircraft during two hot days, including ambient and ceiling temperatures in the hangar where these tools were located. Structural models were developed to perform finite element analyses (FEA), revealing significant displacements in the vertical and transverse directions, directly impacting hinge tolerances and causing assembly delays in the absence of corrective shims. To generalize the analysis, a thermal model based on the Lumped Capacitance Method (LCM) was created to estimate surface temperatures from environmental conditions. The model showed an average error below 10%, and the subsequent structural analyses confirmed the displacement results with a low error and differences between the built models around 0.06 mm, validating the methodology for future evaluations in assembly processes.

2025-11-06T00:00:00Z https://repositorio.ufu.br/handle/123456789/47872 2025-12-18T06:22:44Z 2025-11-27T00:00:00Z

Title: Análise de fadiga em engrenagem planetária do EC225 via simulação computacional Abstract: This study presents the analysis and development of a computational model of the planetary gear located in the Main Gear Box (MGB) of the EC225 Super Puma helicopter, with the objective of mitigating component failures caused by fatigue. Fatigue failures in transmission system components are recurrent due to their exposure to cyclic loads. In this study, the accident involving CHC Flight 241 near Turøy, Norway, was investigated, which occurred as a result of fatigue failure in the planetary gear of the MGB of the EC225 Super Puma. Based on this case, an analysis was conducted and improvements to the component were proposed, employing SolidWorks software for the creation of the Computer-Aided Design (CAD) model and ANSYS software to perform structural fatigue simulations using the Finite Element Method (FEM). Additionally, fatigue criteria and methodologies were examined to support the simulations. Following the study and analysis of the simulations of the gear manufactured from 16NCD13 steel, the original material of the gear, a solution was proposed to enhance the material of the studied component. A comparative evaluation was carried out between the original steel and Maraging 18Ni steel and 300M steel. The simulation results revealed a significant increase in the number of complete life cycles of the component when using Maraging or 300M steel, with Maraging steel demonstrating superior improvement. Through computational analysis and the applied methodologies, this research provides a material enhancement solution for the studied component, contributing to increased reliability and safety in aeronautical engineering projects.

2025-11-27T00:00:00Z https://repositorio.ufu.br/handle/123456789/47462 2025-10-21T06:21:22Z 2025-09-29T00:00:00Z

Title: Integração de Interface Conversacional (Chatbot) a uma Aplicação Web para Gestão de Consultas Médicas

2025-09-29T00:00:00Z