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Subject: search.filters.subject.Analytical model

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    Cost-effective FRP solutions for enhancing strength and strain of sustainable concrete made with waste tyre rubber
    (2026-12-01)
    Saingam, Panumas
    ;
    Chatveera, Burachat
    ;
    Hussain, Qudeer
    ;
    Sua-iam, Gritsada
    ;
    Chaimahawan, Preeda
    This study investigates the compressive behavior and analytical modeling of natural and rubberized concretes confined with cost-effective glass fiber-reinforced polymer (GFRP) jackets. Forty-two cylindrical specimens were tested under axial compression, including natural aggregate concrete (NAC) and rubberized concretes (RuC) prepared with 20% fine aggregate replacement using coarse (2.0 mm) and fine (0.425 mm) waste tire rubber. Both full and strip GFRP wrapping configurations with two, four, and six layers were examined. The results showed that GFRP confinement substantially enhanced both strength and ductility, transforming brittle failure into a gradual, energy-absorbing response. Full wrapping produced up to 63% and 90% strength increases for NAC and rubberized concretes, respectively, with ultimate strain gains exceeding 1300% in the fine-rubber mix. Strip wrapping achieved moderate yet significant improvements while offering material savings. Analytical models were developed for both concrete types to predict confined stress–strain behavior, achieving strong correlations (R<sup>2</sup> = 0.84–0.99) between predicted and experimental data. The derived regression-based formulations successfully captured the influence of confinement pressure, rubber content, and wrapping configuration. These findings demonstrate that GFRP provides an economical and sustainable confinement solution for enhancing the performance of rubberized concrete in structural and retrofitting applications.
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    Analysis of a switched-reluctance generator for maximum energy conversion
    (2017-01-01)
    Wongguokoon, Supakit
    ;
    Kittiratsatcha, Supat
    An effective analytical expression for maximum energy conversion in terms of DC-bus voltage, shaft speed, and turn-on and turn-off angles of a switched-reluctance generator (SRG) based on self-excitation mode and single-pulse operation is successfully presented. The proposed analytical model, which can describe the nonlinearity of the magnetic characteristics of an SRG with sufficient accuracy, is the key to derive the relation between maximum energy conversion and the aforementioned control variables. The optimal ratio of DC-bus voltage to shaft speed and excitation angle are proposed. Simulation and experimental results are provided to validate the analysis.
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    Optimal excitation angles of a switched reluctance generator for maximum output power
    (2014-01-01)
    Thongprasri, Pairote
    ;
    Kittiratsatcha, Supat
    This paper investigates the optimal values of turn-on and turn-off angles, and ratio of flux linkage at turn-off angle and peak phase current positions of optimal control for accomplishing maximum output power in an 8/6 Switched Reluctance Generator (8/6 SRG). Phase current waveform is analyzed to determine optimal excitation angles (optimal turn-on and turn-off angles) of the SRG for maximum output power which is applied from a nonlinear magnetization curve in terms of control variables (dc bus voltage, shaft speed, and excitation angles). The optimal excitation angles in single pulse mode of operation are proposed via the analytical model. Simulated and experimental results have verified the accuracy of the analytical model.
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    Analysis of a switched-reluctance generator for maximum energy conversion
    (2010-12-01)
    Wongguokoon, Supakit
    ;
    Kittiratsatcha, Supat
    A successful analytical expression for maximum energy conversion in terms of DC-bus voltage, shaft speed and turn on/off angles of a Switched Reluctance Generator (SRG) based on self-excitation mode, single pulse operation is presented. The proposed analytical model, which can describe nonlinear of the magnetic characteristics of a SRG with sufficient accuracy, is the key used to derive the relation of maximum energy conversion with those control variables. The optimal ratio of DC-bus voltage over shaft speed, and excitation angle are proposed. Simulation and experimental results are provided to validate the analysis.