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A Simplified Constrained Predictive Position Control for PMSM Drives With Laguerre Functions

Abstract

Predictive position control (PPC) method with long predictive horizon is an effective method to eliminate the cascade structure and improve the dynamic response for the permanent magnet synchronous motor (PMSM). However, traditional PPC method needs a time-consuming prediction process and does not always guarantee satisfactory position performance. In this article, a simplified constrained PPC method is proposed, the Laguerre functions are designed to construct the control trajectory of position system, which offers two control degrees to improve the position dynamic response and simplify programming of prediction process. Besides that, the optimization model with current constraints, speed constraints, and voltage constraints are constructed with the frame of Laguerre functions. The optimization model with constraints is solved with an optimal method and suboptimal method. The proposed PPC method is experimentally verified and compared with field-oriented control (FOC) method and a traditional PPC method, the results have proved that proposed method has excellent position performance and low calculation burden.

article Article

date_range 2024

language English

link Link of the paper

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He Chun

Hu Jianhui

Ran Xiaohe

Wei Fangrui

Li Yong

Zhu Yanhe

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Featured Keywords

Position control

Voltage control

Trajectory

Predictive models

Predictive control

Cost function

Steady-state

Dynamic performance

Laguerre functions

permanent magnet synchronous motor (PMSM)

predictive position control (PPC)

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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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