José M. Balthazar

Hub-driven dynamical collapse in coupled hysteretic networks

Mauricio A. [UNESP] Ribeiro, Gabriella de O. M. Silva, José M. Balthazar, Jeferson Lima et autres

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A nonlinear windkessel model for cardiovascular dynamics: Variable compliance and pathological simulations

Marcus Vinicius Monteiro Varanis, Mateus Nunes César Ferraz, Daniel Silva Longo, José M. Balthazar

Lumped-parameter cardiovascular models are computationally efficient and physiologically interpretable, but many still represent arterial compliance as linear and pressure-independent. Here, we introduce a nonlinear extension of a classical closed-loop Windkessel model by defining aortic compliance as an exponential function of aortic pressure. …

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DEVELOPMENT OF AN EXPERIMENTAL PLATAFORM FOR THRUST TESTING OF AIRCRAFT ELETRIC PROPULSION SYSTEM

Jaber João Macari Neto, Vinicius Reis, Vítor Paixão, Andrew Gomes Pereira Sarmento et autres

The objective of this work is to develop an experimental platform for measuring thrust data from the engine and propeller assembly of electric aerial vehicles, contributing to the validation of the aeronautical design phase. As electric propulsion systems gain prominence in modern …

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Vibration analysis of an extremely flexible beam with concentrated load axially stressed by incremental force

Iago Gonçalves de Oliveira, Alexandre de Macêdo Wahrhaftig, Mariely De Jesus Neri, Eduardo Márcio de Oliveira Lopes et autres

Throughout human history, cables have been essential for the development of various tools. In prehistoric times, they helped with hunting, fishing and harvesting; during the Portuguese caravel period, they were fundamental in the structural design of ships; in cable-stayed bridges, they became …

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Optimal Linear Feedback Control—OLFC Applied to a Small Turbine Operating in Region II

Luan J. F. Ferreira, Hilson H. Daũm, José M. Balthazar, Giane Gonçalves Lenzi et autres

Wind energy production is growing year after year, increasing the share of wind energy in global energy sources. The amount of energy obtained depends on the wind speed. When wind speeds are below the nominal value, the goal is to maximize energy …

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Investigation of Transients Generated by Dry-Contact Switching of LED Lamps

Alisson L. Agusti, Giane G. Lenzi, José M. Balthazar, Ângelo Marcelo Tusset

LED lamps have not been demonstrating the durability claimed by their manufacturers. One hypothesis is that switching transients may contribute to this. This study investigated switching-induced transients in LED lamps operated through dry contacts: manual switches and contactors. Using an oscilloscope, automated …

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A probabilistic framework for robustness analysis of optimal time-delayed and extended time-delayed feedback controllers for chaos control

Vinícius Piccirillo, José M. Balthazar, Jeferson José Lima, Ângelo Marcelo Tusset

Abstract This work presents a probabilistic framework for analyzing the robustness of optimal time-delayed feedback (TDF) and extended time-delayed feedback (ETDF) controllers in stabilizing unstable periodic orbits (UPOs) embedded in the chaotic attractor of a Duffing oscillator. The study integrates established tools, …

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Nowadays Advances in the Study of Sommerfeld Effect in Non-linear Vibrating Systems Excited by a Non-ideal Energy Source

José M. Balthazar, Ângelo Marcelo Tusset, Jeferson Lima, Julijana D. Simonović et autres

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Vibration Control of a High-Speed Elevator Using Smart Devices

Ângelo Marcelo Tusset, José M. Balthazar, Marcos Gonçalves, Giane Gonçalves Lenzi

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On the experimental and numerical determination of dynamic parameters of overhead power cables

Kevin Mauricio Menon Ribeiro, José M. Balthazar, Alexandre de Macêdo Wahrhaftig, Eduardo Márcio de Oliveira Lopes

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On Nonlinear Dynamics Of A Nonideal Magnetic System With Shape Memory Alloy To Energy Harvesting Using Uncertainty Exponent And Entropy Of Basin Of Attractions Approaches

Antonio M. O. Ribeiro, José M. Balthazar, Ângelo Marcelo Tusset, Jeferson José de Lima et autres

In this paper, we dealt the dynamic behavior of a magnetic structure, considering a shape memory spring and a non-ideal motor as excitation. It has fractal behavior of tits basins of attraction, for a set of parameters for energy harvesting. We also …

A State of the Art on Recent Progress and Emerging Challenges on Energy Transfer Between Vibrating Modes Under an External Mechanical Force With Time-Varying Frequency From 2020 to 2025

José M. Balthazar, Jorge Luis Palacios Félix, Maurício A. Ribeiro, Ângelo Marcelo Tusset et autres

In this paper, we discuss an example of current importance with a future perspective in engineering, in which excitation sources always have limited power, limited inertia, and their frequencies vary according to the instantaneous state of the vibrating system. Practical examples of …