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An Adaptive Integral Sliding Mode Control-Based Amplitude and Phase Compensation Repetitive Control Method

Abstract

This article presents an adaptive integral sliding mode control-based amplitude and phase compensation repetitive-control method that achieves precise tracking control for nonlinear systems. An adaptive integral sliding mode controller handles system nonlinearity and helps stabilize the system, thus simplifying the system structure. An adaptive law removes the requirement of knowing the nonlinear information and helps quickly enter the sliding surface. An amplitude and phase compensation repetitive controller achieves precise control of periodic signals. This controller makes small changes in the positive-feedback loop to compensate for the amplitude and phase changes caused by the low-pass filter, which greatly improves the steady-state tracking performance compared with the conventional modified repetitive controller. Simulation and experimental results verify the effectiveness and superiority.

article Article

date_range 2024

language English

link Link of the paper

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Wang Yibing

Zhang Manli

Tian Shengnan

Lu Chengda

Wu Min

Sato Daiki

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Featured Keywords

Control systems

Stability analysis

Adaptive systems

Vectors

Target tracking

Steady-state

Task analysis

Adaptive integral sliding mode control

amplitude and phase compensation repetitive control (RC)

tracking control

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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

link Link of the paper

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