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New Second-Level-Discrete Zeroing Neural Network for Solving Dynamic Linear System

Abstract

Dear Editor, This letter deals with a new second-level-discretization method with higher precision than the traditional first-level-discretization method. Specifically, the traditional discretization method utilizes the first-order time derivative information, and it is termed first-level-discretization method. By contrast, the new discretization method not only utilizes the first-order time derivative information, but also makes use of the second-order derivative information. By combining the new second-level-discretization method with zeroing neural network (ZNN), the second-level-discrete ZNN (SLDZNN) model is proposed to solve dynamic (i.e., time-variant or time-dependent) linear system. Numerical experiments and application to angle-of-arrival (AoA) localization show the effectiveness and superiority of the SLDZNN model.

article Article

date_range 2024

language English

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Yang Min

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

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