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Networked stabilization of multi-input systems over MIMO communication

Abstract

In this paper, we study networked stabilization of a multi -input linear time -invariant (LTI) system closed over a multi -input multi -output (MIMO) communication system modeled as a MIMO transceiver. The controller and encoder/decoder pair are jointly designed subject to a total power constraint. We obtain an analytic solution to the minimum transmission power required for networked stabilization under coding/control co -design given in terms of the topological entropies of cyclic subsystems of the open -loop plant and the quality of service (QoS) of channel eigenmodes of the MIMO channel. Also, an optimal coding/control co -design procedure is proposed. The results generalize the understandings in the literature concerning parallel additive white noise (AWN) channels. A numerical example is provided to verify the results.

article Article

date_range 2024

language English

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Li Junhui

Chen Wei

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Featured Keywords

Networked stabilization

Multi-input linear systems

MIMO communication

Transmission power

Coding/control co-design

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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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