Repositório UFSCar

O Repositório Institucional da UFSCar (RI UFSCar) é um sistema de informação que visa armazenar, preservar, organizar e disseminar amplamente a produção intelectual dos diversos setores e segmentos da comunidade da UFSCar, provendo o acesso aberto à informação produzida na instituição e registrada como científica, tecnológica, didática, artístico-cultural e técnico-administrativa.

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Onde o sonho se rompe, cultivar a vida: uma análise documental da política de saúde mental da Universidade Federal de São Carlos
(Universidade Federal de São Carlos, 2026-07-08) Lopes, Lueny Helena; Ferigato, Sabrina Helena; http://lattes.cnpq.br/3248396158325409; https://orcid.org/0000-0001-7567-7225; http://lattes.cnpq.br/9116661245136164; https://orcid.org/0009-0005-2262-3457; Marcolino, Tais Quevedo; http://lattes.cnpq.br/7197838515800679; https://orcid.org/0000-0002-9694-5118
This research emerges from the encounter between a trajectory and a territory: that of the public university and that of the urgencies of the life that inhabits it. It takes as its field of attention the Mental Health Policy of the Federal University of São Carlos (UFSCar), established in 2023, understanding it as a living body in which meanings of care, suffering, and dreams intertwine. Based on a qualitative and situated documentary analysis - which articulates content analysis, discourse analysis, and affective cartography, from the perspective of occupational therapy - the dissertation proposes an engaged reading of the policy as a discursive gesture, an institutional device, and an expression of collective desire. More than describing the normative text, the research traces its flows, tensions, and silences, recognizing in it both the strengths of a university that seeks to foster care and the fissures of a structure still marked by productivist logics and historical exclusions. The research is guided by the following question: how does the UFSCar Mental Health Policy enunciate, regulate and tension meanings of care and suffering, and what symbolic and political effects emerge from these enunciations for the university territory? The results were organized through the analysis of each of the structuring axes of the UFSCar Mental Health Policy. The primary corpus was complemented by exploratory observation of the institutional website and the Instagram profile of the Mental Health Coordination, mobilized as communicational context of the policy. Each axis was read through four movements: its modes of enunciating care; the subjects convened and the responsibilities assigned; its tensions, silences, and displacements; and the openings it affords to occupational therapy. The cross-sectional analysis of the axes pointed to four categories: territory and belonging; production of suffering and care; institutional listening and silencing; and care as a reinvention of life. The work affirms care as a political and poetic act of reinventing life, and understands university mental health as a contested field in which the challenge is to cultivate spaces that sustain belonging, diversity, and creation. In short, the dissertation is a manifesto of attention and resistance, arguing that where the dream is broken, it is possible to cultivate life.
Compensação de deriva térmica de encoder magnético analógico via software aplicada a compressor hermético para análise de diagrama P-V
(Universidade Federal de São Carlos, 2026-07-17) Valvassore, Felipe Andriotti; Araujo, Luis Antonio Oliveira; http://lattes.cnpq.br/3639906702064630; https://orcid.org/0000-0002-1117-0094
The construction of experimental PV diagrams is fundamental for the reliability analysis of hermetic compressors, since it enables the quantification of the work required by the process the identification of heat transfer losses, and the diagnosis of inefficiencies in the suction and discharge valves. Proper instrumentation of this system requires accurate measurements of the cylinder pressure and the shaft angular position. In this context, magnetic encoders are widely used due to their high resolution and contactless operation. Although magnetic encoders are subject to different sources of error, such as misalignment, electrical noise, and nonlinearities, as well as limitations in repeatability and reproducibility, this work focuses exclusively on thermal drift, as it is an error that can become predominant in applications subjected to large temperature variations, compromising the thermodynamic fidelity of the experimental P V diagrams. These errors arise from temperature-dependent variations in the sensor response, including changes in the signal amplitude and offset, which distort the calculated angle. This work presents a semi-empirical compensation strategy to mitigate the effects of thermal drift in analog magnetic encoders via software. The approach is based on the generation of reference curves under controlled temperature conditions, using a bivariate polynomial regression model of the shaft angle and temperature. The results demonstrate how this thermal phenomenon significantly affects the encoder measurements, particularly at elevated temperatures, leading to severe distortions in the PV diagrams. The application of the proposed method proved to be essential for measurement reliability, since thermal drift can shift the power calculation by approximately 4.25%. This level of error is critical, as it compromises the accuracy of loss segregation and energy efficiency analyses.
Análise do movimento vibratório de um automóvel: modelagem e validação de modelo
(Universidade Federal de São Carlos, 2024-11-18) Lupino, Derik Allison Lima da Silva; Franco, Vitor Ramos; http://lattes.cnpq.br/4590258470207467
Studies in the area of vehicle dynamics have been carried out since the beginning of the automobile industry, but problems of discomfort for passengers in a car caused by vibrations from oscillations in the road are common in many practical applications. With this in mind, suspensions have been sought with the function of isolating the structure and occupants of the vehicle from these vibrations caused by irregularities in the road, so the aim of the studies was to define a mathematical model, analyze and validate a car model. The tests were carried out using a signal acquisition board and an accelerometer, to which an input force was applied manually. Using MatLab, parameters such as spring stiffness and damping coefficient were obtained to compare the virtual physical model with the real physical model. By analyzing and validating this model, it was noticed that there were some discrepancies due to experimental errors, mainly in the measurement of spring displacements. This meant that the model had to be adjusted and the dynamic parameters recalculated to bring it closer to the real thing. Finally, it was realized that the real model is damped, and that performing the manual test brings some problems such as the lack of an input parameter, but with the adjusted data, a good approximation was obtained, thus concluding that the mathematical model is valid, allowing the efficient execution of suspension projects, increasing the performance of the vehicles, improving stability and driver comfort, resulting in a safer and more enjoyable driving experience.
Estudo comparativo do comportamento vibratório estrutural e aeroelástico de uma asa de aeronave de pequeno porte
(Universidade Federal de São Carlos, 2025-07-25) Toledo, Pedro Henrique Damasceno Cantelli; Franco, Vitor Ramos; http://lattes.cnpq.br/4590258470207467
The increasing use of small aircraft, such as surveillance drones and agricultural platforms, has intensified the demand for lightweight, resistant structures with good dynamic performance. In this context, understanding the structural and dynamic behavior of wings is essential to ensure safety, stability, and aerodynamic efficiency. This work aims to perform the modeling, modal analysis, and structural validation of scaled-down aircraft wings for aeroelastic applications. The adopted methodology includes the development of a physical model based on NACA 4-digit airfoils, 3D modeling using CAD software, and numerical simulation of dynamic behavior through modal analysis using Siemens NX. Material properties were obtained from technical databases, and the natural vibration modes were compared to experimental data collected through impact tests and wind tunnel experiments, using piezoelectric sensors, accelerometers, and force transducers. Additionally, a computational model was implemented in GNU Octave to simulate the dynamic behavior of the wing based on the differential equations of a mass-spring-damper system. As a result, the natural frequencies and vibration modes of the structure were identified, allowing verification of consistency between numerical and experimental models. The validated structural model, even at reduced scale, provides important insights for the future development of more complex aeroelastic systems, particularly in applications where flutter and other dynamic instabilities pose risks to aircraft stability.
Influência da dinâmica lateral no projeto de suspensão automotiva
(Universidade Federal de São Carlos, 2025-07-18) Ayosa, Felipe; Franco, Vitor Ramos; http://lattes.cnpq.br/4590258470207467
Faced with the need to size automotive systems and components, there are usually difficulties in selecting inputs for performing effort calculations. Therefore, understanding how the vehicle's behavior impacts that system is important to choose parameters that are closer to reality. When it comes to the suspension system, this phenomenon becomes an even greater challenge, as there are several factors that affect its performance. Thus, this work brings an analysis of how lateral dynamics influence the design of automotive suspension, focusing on the vertical accelerations of the wheels in different trajectories and conditions. The purpose is to obtain inputs for the design of components through simulations of real operating situations. To do this, a Formula SAE type vehicle with seven degrees of freedom was modeled, considering the vertical displacements and the forces generated by the lateral load transfer during curves. The model was created based on the theory of Vehicle dynamics and implemented in the MATLAB software. Iterations were made varying the radius of the curve and the speed, using as a reference a track profile with irregularities according to the ISO 8608 standard. The results were analyzed from the qualitative perspective of the fatigue failure theory, distinguishing them between causes of medium and alternating stresses, in addition to discussing the performance against Goodman's criterion. Based on the study carried out, lateral dynamics has its indispensable consideration for the sizing of suspension components, based on acceleration inputs obtained by simulations.