Campus Units

Civil, Construction and Environmental Engineering, Electrical and Computer Engineering, Center for Nondestructive Evaluation (CNDE)

Document Type

Article

Publication Version

Published Version

Publication Date

2015

Journal or Book Title

International Journal of Computational Methods and Experimental Measurements

Volume

3

Issue

1

First Page

49

Last Page

64

DOI

10.2495/CMEM-V3-N1-49-64

Abstract

The design of closed-loop structural control systems necessitates a certain level of robustness to cope with system uncertainties. Neurocontrollers, a type of adaptive control system, have been proposed to cope with those uncertainties. However, the performance of neural networks can be substantially influenced by the choice of the input space, or the hyperspace in which the representation lies. For instance, input selection may influence computation time, adaptation speed, effects of the curse of dimensionality, understanding of the representation, and model complexity. Input space selection is often overlooked in literature, and inputs are traditionally determined offline for an optimized performance of the neurocontroller. Such offline input selection is often unrealistic to conduct in the case of civil structures. In this paper, a novel method for automating the input selection process for neural networks is presented. The method is purposefully designed for online input selection during adaptive identification and control of nonlinear systems. Input selection is conducted online and sequentially, while the excitation is occurring. The algorithm designed for the adaptive input space assumes local quasi-stationarity of the time series, and embeds local maps sequentially in a delay vector using the embedding theorem. The input space of the representation is subsequently updated. The performance of the proposed dynamic input selection method is demonstrated through simulating semi-active control of an existing structure located in Boston, MA, U.S.A. Simulation results show the substantial performance of the proposed algorithm over traditional fixed-inputs strategies.

Research Focus Area

Structural Engineering

Comments

This article is published as Laflamme, S. "Adaptive Structural Control Using Dynamic Hyperspace." International Journal of Computational Methods and Experimental Measurements 3, no. 1 (2015): 49-64. doi: 10.2495/CMEM-V3-N1-49-64. Posted with permission.

Copyright Owner

WIT Press

Language

en

File Format

application/pdf

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