https://repositorio.ufu.br/handle/123456789/5146 2026-10-01T17:41:25Z 2026-10-01T17:41:25Z https://repositorio.ufu.br/handle/123456789/50457 2026-09-26T06:17:41Z 2026-03-24T00:00:00Z

Title: Comparative study of aerodynamic models for aeroelastic flutter prediction and dynamic stall Abstract: The present work reviews and compares the main methods for modeling bidimensional aeroelastic flutter, with particular focus on different aerodynamic formulations and their ability to represent dynamic stall effects. The objective is to provide a comparative view of these methods, serving as an auxiliary set of tools for estimating and predicting experimental results, especially in the context of research aeroelastic tests. Simpler attached-flow formulations, namely quasi-steady and unsteady models, are first investi gated, followed by more advanced semi-empirical dynamic stall models, namely the ONERA and Leishman–Beddoes formulations. All models are numerically implemented in MATLAB and analysed through comparison with a reference experimental case from the literature. By identifying the main characteristics, advantages, and limitations of each approach, it is concluded that, among the attached-flow methods, the unsteady Wagner aerodynamic model provides more accurate predictions than the quasi-steady formulation, since flutter is inherently a high-frequency dynamic phenomenon. Among the semi-empirical models with dynamic stall representation, the Leishman–Beddoes method yields the most satisfactory results, mainly due to the previously validated calibration of its aerodynamic parameters.

2026-03-24T00:00:00Z https://repositorio.ufu.br/handle/123456789/50437 2026-09-26T06:19:03Z 2026-09-11T00:00:00Z

Title: Memorial acadêmico: requisito para promoção à classe de professor titular (Carreira do Magistério Superior – Resolução CONDIR 2017-03) Abstract: This Academic Memorial summarizes the scientific, teaching, administrative, and university outreach trajectory of Professor Valério Luiz Borges, prepared in strict compliance with the guidelines of CONDIR Resolution 2017-03 of the Federal University of Uberlândia (UFU). The applicant’s academic career at UFU began in 1997 with an undergraduate degree in Mechanical Engineering from the School of Mechanical Engineering (FEMEC), continuing uninterrupted at the same institution with the attainment of Master’s (2004), Doctoral (2008), and Postdoctoral (2008–2009) degrees. Appointed as a tenured faculty member at UFU in 2010, the professor has consolidated significant contributions to undergraduate and graduate education, the coordination and leadership of high-impact research at the Heat and Mass Transfer Laboratory (LTCM), technology transfer to the productive sector, and university administration. Over nearly three decades of continuous engagement in higher education and scientific research, the candidate presents a solid bibliographic output, substantial acquisition of funding grants (CNPq, FAPEMIG, FINEP), and prominent industrial partnerships—notably contributing to the consolidation of cutting-edge national technological infrastructure in the field of waste-to-energy recovery. This document details this journey, demonstrating the academic maturity and institutional commitment required for the rank of Full Professor.

2026-09-11T00:00:00Z https://repositorio.ufu.br/handle/123456789/50392 2026-09-24T06:20:08Z 2026-07-14T00:00:00Z

Title: Furação da liga de alumínio Al-Mg-Si 6351 T6 utilizando brocas helicoidais de aço-rápido revestidas com Diamond-Like Carbon Abstract: Dry machining of aluminum alloys is a technique that has been widely addressed, especially in studies focused on contextualizing drilling within the "Green Manufacturing" concept. One of the challenges faced in this technique is the adhesion mechanism, which intensifies during the machining of aluminum alloys and the inherent complexities of drilling. In addition, given the use of high-speed steel—a material with significant representation in the total production of cutting tools—it becomes vital to investigate ways to improve its performance during machining. In this context, the family of diamond-like carbon (DLC) coatings presents characteristics that can be advantageous for dry machining, although some inconsistencies in application are still observed, thus encouraging the development of new research. Based on this, the investigation of the effects of feed rate, cutting speed, cutting wedge geometry, and DLC coatings during dry drilling of Al-Mg-Si 6351 T6 alloy was proposed, using AISI M35 high-speed steel twist drills, while evaluating chip formation, predominant wear mechanisms, machining forces, form and dimensional deviations, and surface texture. The methodology consisted of stages of material acquisition, preparation and characterization, experimental design, and description of response variables. A total of 108 unit tests were performed. Results confirmed the chemical, structural, and mechanical characteristics of the machined alloy and the material used to manufacture the cutting tools. Similar layers of hydrogenated amorphous carbon were identified in both coatings, classified as predominantly solid lubricants with sp2 hybridization and satisfactory adhesion to the substrate. In machining tests, it was found that minimizing the feed rate and maximizing the cutting speed provided better results. Improvements in dry machining were observed through the use of coatings, particularly the one composed of a chromium nitride layer. With the use of chip breakers, a slight improvement in the surface texture of the holes was noted, which, however, was offset by a significant and unexpected alteration in chip morphology. Future studies are needed to refine this cutting wedge geometry.

2026-07-14T00:00:00Z https://repositorio.ufu.br/handle/123456789/50360 2026-09-22T06:19:46Z 2026-08-14T00:00:00Z

Title: Aplicação de estabilidade em uma clínica odontológica de pequeno porte Abstract: Small dental clinics usually focus on clinical excellence while neglecting support processes, which leads to material waste, delays and team overload. This work proposes the implementation of the Lean Healthcare operational stability concept in the support sector of a small dental clinic, focusing on the storeroom and the sterilization center. The research, applied in nature and with a quali-quantitative approach, was conducted through action research, with participant observation, inventory audit, time study and photographic records, structured by the A3 Report and three Ishikawa diagrams adapted to the 6Ms, one for each measured effect. The diagnosis identified losses of BRL 7,190.00 per year in expired materials, a 40-minute room setup time and up to five interruptions per surgery to search for missing items, in an operation of approximately 130 full-setup surgeries per year. The implemented countermeasures (5S with visual management, FIFO system, standardized surgical kits and a standard operating procedure for room assembly) reduced setup time to 15 minutes (62.5%), eliminated surgical interruptions, stopped the disposal of expired materials and removed an average monthly expense of BRL 46.00 on emergency freight, freeing about 50 hours per year of the bottleneck resource. The stabilization of the 6Ms proves to be a feasible, low-cost prerequisite for continuous improvement in dental services.

2026-08-14T00:00:00Z