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Search Results: 1 - 10 of 448492 matches for " J. L.;Balthazar "
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On non-ideal and non-linear portal frame dynamics analysis using bogoliubov averaging method
Palacios, J. L.;Balthazar, J. M.;Brasil, R. M. L. R. F.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000400002
Abstract: we apply the bogoliubov averaging method to the study of the vibrations of an elastic foundation, forced by a non-ideal energy source. the considered model consists of a portal plane frame with quadratic nonlinearities, with internal resonance 1:2, supporting a direct current motor with limited power. the non-ideal excitation is in primary resonance in the order of one-half with the second mode frequency. the results of the averaging method, plotted in time evolution curve and phase diagrams are compared to those obtained by numerically integrating of the original differential equations. the presence of the saturation phenomenon is verified by analytical procedures.
A short note on a nonlinear system vibrations under two non-ideal excitations
Palacios, J. L.;Balthazar, J. M.;Brasil, R. M. L. R. F.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2003, DOI: 10.1590/S1678-58782003000400011
Abstract: this paper describes a nonlinear phenomenon in the dynamical behavior of a nonlinear system under two non-ideal excitations: the self-synchronization of unbalanced direct current motors. the considered model is taken as a duffing system that is excited by two unbalanced direct current motors with limited power supplies. the results obtained by using numerical simulations are discussed in details
On non-ideal and non-linear portal frame dynamics analysis using bogoliubov averaging method
Palacios J. L.,Balthazar J. M.,Brasil R. M. L. R. F.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: We apply the Bogoliubov Averaging Method to the study of the vibrations of an elastic foundation, forced by a Non-ideal energy source. The considered model consists of a portal plane frame with quadratic nonlinearities, with internal resonance 1:2, supporting a direct current motor with limited power. The non-ideal excitation is in primary resonance in the order of one-half with the second mode frequency. The results of the averaging method, plotted in time evolution curve and phase diagrams are compared to those obtained by numerically integrating of the original differential equations. The presence of the saturation phenomenon is verified by analytical procedures.
A short note on a nonlinear system vibrations under two non-ideal excitations
Palacios J. L.,Balthazar J. M.,Brasil R. M. L. R. F.
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2003,
Abstract: This paper describes a nonlinear phenomenon in the dynamical behavior of a nonlinear system under two non-ideal excitations: the self-synchronization of unbalanced direct current motors. The considered model is taken as a Duffing system that is excited by two unbalanced direct current motors with limited power supplies. The results obtained by using numerical simulations are discussed in details
A brief comment on the dynamical behavior of a forced nonlinear slewing beam: 1. Superharmonic resonance
Fenili, A.;Souza, L. C. Gadelha de;Balthazar, J. M.;Góes, L. C. S.;
Journal of the Brazilian Society of Mechanical Sciences and Engineering , 2005, DOI: 10.1590/S1678-58782005000200014
Abstract: this paper describes the dynamical behavior of a nonlinear flexible beam (cubic nonlinearities considered) connected to a dc motor (responsible for the slewing motion) when the angular displacement of the slewing axis and its derivatives are considered to be of a harmonic type and the system is excited near a resonance (present due to the nonlinear contribution).
Nonlinear dynamics and control strategies: On a energy harvester vibrating system with a linear form to non-ideal motor torquet
Iliuk I.,Balthazar J. M.,Tusset A. M.,Felix J.L.P.
MATEC Web of Conferences , 2012, DOI: 10.1051/matecconf/20120108003
Abstract: In this paper, we deal with the research of a vibrating model of an energy harvester device, including the nonlinearities in the model of the piezoelectric coupling and the non-ideal excitation. We show, using numerical simulations, in the analysis of the dynamic responses, that the harvested power is influenced by non-linear vibrations of the structure. Chaotic behavior was also observed, causing of the loss of energy throughout the simulation time. Using a perturbation technique, we find an approximate analytical solution for the non-ideal system. Then, we apply both two control techniques, to keep the considered system, into a stable condition. Both the State Dependent Ricatti Equation (SDRE) control as the feedback control by changing the energy of the oscillator, were efficient in controlling of the considered non-ideal system.
Influência da suspens?o na seguran?a e no conforto de um pulverizador autopropelido
Ferreira, André L.;Balthazar, José M.;Pontes Júnior, Bento R.;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000400019
Abstract: to evaluate the behavior of the suspension of self-propelled sprayer were developed physical and mathematical models as a function of excitement caused by irregularities in the soil. in this work, these irregularities are represented by obstacles of a track standard from iso 5008. the motion equations are obtained from half car model. the numeric simulations are executed in software matlab? and simulink?. from a known entry, the characteristics of the suspension elements can be determined for obtain desirable levels of comfort and safety. four settings with different stiffness ratio were simulated. it was found that the increase of stiffness ratio results in the reduction of vertical acceleration and in the increase of suspension travel, improving the comfort and decreasing safety.
Analysis of Regular and Irregular Dynamics of a Non Ideal Gear Rattling Problem
Souza, S. L. T. de;Caldas, I. L.;Balthazar, J. M.;Brasil, R. M. L. R. F.;
Journal of the Brazilian Society of Mechanical Sciences , 2002, DOI: 10.1590/S0100-73862002000200005
Abstract: this paper presents a study on the dynamics of the rattling problem in gearboxes under non-ideal excitation. the subject has being analyzed by a number of authors such as karagiannis and pfeiffer (1991), for the ideal excitation case. an interesting model of the same problem by moon (1992) has been recently used by souza and caldas (1999) to detect chaotic behavior. we consider two spur gears with different diameters and gaps between the teeth. suppose the motion of one gear to be given while the motion of the other is governed by its dynamics. in the ideal case, the driving wheel is supposed to undergo a sinusoidal motion with given constant amplitude and frequency. in this paper, we consider the motion to be a function of the system response and a limited energy source is adopted. thus an extra degree of freedom is introduced in the problem. the equations of motion are obtained via a lagrangian approach with some assumed characteristic torque curves. next, extensive numerical integration is used to detect some interesting geometrical aspects of regular and irregular motions of the system response.
Analysis of Regular and Irregular Dynamics of a Non Ideal Gear Rattling Problem
Souza S. L. T. de,Caldas I. L.,Balthazar J. M.,Brasil R. M. L. R. F.
Journal of the Brazilian Society of Mechanical Sciences , 2002,
Abstract: This paper presents a study on the dynamics of the rattling problem in gearboxes under non-ideal excitation. The subject has being analyzed by a number of authors such as Karagiannis and Pfeiffer (1991), for the ideal excitation case. An interesting model of the same problem by Moon (1992) has been recently used by Souza and Caldas (1999) to detect chaotic behavior. We consider two spur gears with different diameters and gaps between the teeth. Suppose the motion of one gear to be given while the motion of the other is governed by its dynamics. In the ideal case, the driving wheel is supposed to undergo a sinusoidal motion with given constant amplitude and frequency. In this paper, we consider the motion to be a function of the system response and a limited energy source is adopted. Thus an extra degree of freedom is introduced in the problem. The equations of motion are obtained via a Lagrangian approach with some assumed characteristic torque curves. Next, extensive numerical integration is used to detect some interesting geometrical aspects of regular and irregular motions of the system response.
Characterization in bi-parameter space of a non-ideal oscillator
S. L. T. de Souza,A. M. Batista,M. S. Baptista,I. L. Caldas,J. M. Balthazar
Physics , 2015,
Abstract: We investigate the dynamical behavior of a non-ideal Duffing oscillator, a system composed of a mass-spring-pendulum driven by a DC motor with limited power supply. To identify new features on Duffing oscillator parameter space due to the limited power supply, we provide an extensive numerical characterization in the bi-parameter space by using Lyapunov exponents. Following this procedure, we identify remarkable new periodic windows, the ones known as Arnold tongues and also shrimp-shaped structures. Such windows appear in highly organized distribution with typical self-similar structures for the shrimps, and, surprisingly, codimension-2 bifurcation as a point of accumulations for the tongues.
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