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    Equivalent circuit model and simulation for dynamic sliding droplet-based triboelectric nanogenerators
    (2024-11-01)
    Sriphan, Saichon
    ;
    Pharino, Utchawadee
    ;
    Chaithaweep, Kanokwan
    ;
    Vittayakorn, Naratip
    Recently, there has been an increase of attention to employing liquid-solid contact to harvest or sense energy from water flow. Water's considerable deformability, however, makes it challenging to investigate how water moves dynamically in relation to a water-based triboelectric nanogenerator's (TENG) output characteristic. There are a few studies examining the fundamental mechanism of a droplet-based energy generator (DEG). In addition, such an electrical model has been established based on the consideration of instantaneous output at a specific period in a saturated state. Here, we first propose the circuit model and governing equations for simulating the double-electrode DEG's electrical output, comprehensively covering the L-S contact's dynamic process. Four essential stages of charge generation of the DEG are considered in unsaturated and saturated stages. The proposed model is verified systematically with the experimental data. The relationship between structural parameters and output performance of the DEG, such as internal capacitance, residual charge, dielectric constant, droplet spreading size, and dielectric thickness, has emerged. In summary, our model effectively establishes theoretical guidance, which paves the way for high-performance supply and sensor applications based on the L-S interface.
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    Optimum winding tension and nip-load into wound webs for protecting wrinkles and slippage
    (2010-12-01)
    Hashimoto, Hiromu
    ;
    Jeenkour, Puttha
    ;
    Mongkolowongrojn, Mongkol
    This paper describes the novel optimization method of wind-up tension to prevent wound roll defects, mainly star defect (wrinkling) and telescoping (slippage), based on the optimum design technique. Modified Hakiel model with air entrainment effects is applied to analyze in-roll stress distributions in the radial and tangential directions. In the present optimization method, the wind-up tension is gradually changed in the radial direction to minimize the tangential stresses under the constraint of nonnegative tangential stresses. At the same time, we consider the friction conditions to prevent the slippage between web layers due to a decrease of radial stresses and friction force. Successive quadratic programming, which is a typical mathematical programming method, is used as the optimization technique. The optimized wind-up tensions are obtained for various winding conditions, and we confirmed theoretically and experimentally that the in-roll stress distributions are very much improved for preventing both wrinkling and slippage simultaneously by the optimization method being proposed. Copyright © 2010 by JSME.