Examinando por Autor "Arango, I."

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    Characterizing points on discontinuity boundary of Filippov systems
    (ACTA Press, 2008-01-01) Arango, I.; Taborda, J.A.; Arango, I.; Taborda, J.A.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
    In this paper, we presented a basic methodology to understand the behavior of discontinuous piecewise smooth autonomous systems (denominated Filippov systems) in the planar neighborhood of the discontinuity boundary (DB). This methodology is useful in detection of nonsmooth bifurcations in Filippov systems. We propose a classification of the points and events on DB. This classification is more complete in comparison with the reported papers previously. The lines and the points are characterized with didactic symbols and the exclusive conditions for their existence based in geometric criterions. Boolean-valued functions are used to formulate the conditions. An illustrative example with a friction oscillator is presented.
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    Dynamic analysis of a recirculation system of micro functional fluids for ink-jet applications
    (Springer Verlag, 2017-05-01) Arango, I.; Cañas, M.; Arango, I.; Cañas, M.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
    The rise of ink-jet printing technology has led to numerous studies about functional fluids, which, in most cases, are made to change and improve the chemical and rheological properties. Besides this, there are several patents about the recirculation fluid system that help to prevent settling particles, and thus improving print quality without consequences in the chemical composition of the fluid. This paper presents a dynamic analysis of a recirculation circuit for ink-jet microsystems applications with fluids that contain a particle size of 40 nm to 10 µ m. This analysis integrates multiple mathematical and experimental models, in regard to variables such as: viscosity change with temperature and solid volume fraction, sedimentation, surface tension and flow behavior. As a result, specific values of vacuum pressure for different drop-on-demand print heads with different ink-jet functional fluids, places of probable sedimentation and minimum pickup velocities to remove settled particles are given. © 2017, Springer-Verlag Berlin Heidelberg.
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    E-bikes for steep roads: Mid drive and hub drive motor efficiency comparison
    (Inderscience Enterprises Ltd., 2018-01-01) Arango, I.; Godoy, A.; Lopez, C.; Arango, I.; Godoy, A.; Lopez, C.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
    Power input, speed, and efficiency concern people when selecting a transportation means. This study compares multiple e-bikes configurations and presents to the reader scientific criteria to choose the one that fits best for non-trained cyclists, who want to use e-bikes for everyday transportation in cities with steep roads, assuring that the cyclist takes effective part of the power input. Power development, speeds, energy consumption and efficiency result from a mathematical model and experimental data. Configurations vary in motor placement, assistance level, cyclist cadence, wheel type and transmission sets. Results indicate that the motor's placement is the most determining factor in the efficiency of the entire system. Placing the motor in the bottom bracket, allows both the cyclist and the motor to range in the most efficient rpm. As efficiency for the middle drive motor is higher than the hub drive motor, energy consumption in the hub drive motor is 18% higher. Copyright © 2018 Inderscience Enterprises Ltd.
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    Erratum to: Dynamic analysis of a recirculation system of micro functional fluids for ink-jet applications (Microsystem Technologies, (2017), 23, 5, (1485-1494), 10.1007/s00542-016-3254-z)
    (Springer Verlag, 2017-07-01) Arango, I.; Cañas, M.; Arango, I.; Cañas, M.; Universidad EAFIT. Departamento de Ingeniería Mecánica; Mecatrónica y Diseño de Máquinas
    In the original publication of the article, equation (6) and equation (7) were incorrectly published. The correct equations should be as below: (Formula Presented.) (6) (7) In page 7, the second line in the second paragraph should read as follows: This variation is plotted in the range of 20–30 °C; however, the total range of the temperatures is greater as displayed in Eqs. (6) and (7). In page 9, in the Table 7, the words “Head 2” and “Head 3” are repeated. The correct Table 7 is given below: The original article has been updated accordingly. (Table Presented.). © 2017, Springer-Verlag Berlin Heidelberg.