Mr. Pengxiang Liu Profile

Pengxiang Liu

at Missouri Univ of Science and Technology

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Author

Publications (9)

Proceedings Article | 1 August 2003 Paper

Decentralized controller design for smart structural systems

Pengxiang Liu, Vittal Rao

Proceedings Volume 5049, (2003) https://doi.org/10.1117/12.484762

KEYWORDS: Actuators, Control systems, Sensors, Systems modeling, Performance modeling, Computer aided design, Structural design, Computing systems, Matrices, Smart structures

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Proceedings Article | 10 July 2002 Paper

Reduced order controllers for smart structural systems

Pengxiang Liu, Vittal Rao

Proceedings Volume 4693, (2002) https://doi.org/10.1117/12.475223

KEYWORDS: Chromium, Actuators, Direct methods, Control systems, Sensors, Matrices, Performance modeling, Ferroelectric materials, Numerical analysis, Linear filtering

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Proceedings Article | 10 July 2002 Paper

Active control of smart structures with optimal actuator and sensor locations

Pengxiang Liu, Vittal Rao, Mark Derriso

Proceedings Volume 4693, (2002) https://doi.org/10.1117/12.475204

KEYWORDS: Actuators, Sensors, Control systems, Ferroelectric materials, Smart structures, Curium, Computing systems, Analytical research, Bismuth, Smart materials

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Proceedings Article | 21 August 2001 Paper

Model reduction and robust control of smart structures with parametric uncertainties

Pengxiang Liu, Vittal Rao

Proceedings Volume 4326, (2001) https://doi.org/10.1117/12.436495

KEYWORDS: Smart structures, Actuators, Systems modeling, Feedback control, Matrices, Ferroelectric materials, Sensors, Control systems, Intelligence systems, Finite element methods

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Proceedings Article | 21 August 2001 Paper

Lower-order robust controller design for smart structures

Pengxiang Liu, Vittal Rao

Proceedings Volume 4326, (2001) https://doi.org/10.1117/12.436482

KEYWORDS: Performance modeling, Smart structures, Computer aided design, Structural design, Actuators, Matrices, Krypton, Reliability, Sensors, Solid modeling

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Proceedings Article | 16 August 2001 Paper

Web-controlled wireless network sensors for structural health monitoring

Kyle Mitchell, Nghia Dang, Pengxiang Liu, Vittal Rao, Hardy Pottinger

Proceedings Volume 4334, (2001) https://doi.org/10.1117/12.436606

KEYWORDS: Sensors, Sensor networks, Data communications, Structural health monitoring, Data analysis, MATLAB, Algorithm development, Data acquisition, Transceivers, Damage detection

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Proceedings Article | 22 June 2000 Paper

Damage detection using modal strain energy and laser vibrometer measurements

Andrew Otieno, Pengxiang Liu, Vittal Rao, Leslie Koval

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388832

KEYWORDS: Damage detection, Matrices, Optical simulations, Analytical research, Laser energy, Structural health monitoring, Data modeling, Aluminum, Stars, Vibrometry

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Structural health monitoring for complex systems can contribute significantly to reduced life cycle costs. Many damage detection algorithms have been proposed in the literature for investigating the structural integrity of systems. Changes in modal strain energy have been used to detect the location and extent of damage in structures. In the previous studies, the stiffness matrix is analytically derived and assumed constant even after damage. This paper reports a study on the sensitivity of the modal strain energy method to the stiffness matrix and its accuracy in detecting the location and extent of damage. The modal strain energies for each element of the undamaged structure are computed for each mode using the original analytical matrix and measured modal data. Modal data from the damaged case is used to update the stiffness matrix by a simplified matrix update scheme. This updated matrix is used to correct the elemental matrices for the damaged system. Two case studies are presented in this work. The first is an experimental and analytical model of a cantilever beam and the second, a truss model of the European Space Agency. In the first case three identical aluminum cantilever beams are used. Damage is simulated on two of them by milling 1-inch long slots at two different locations on the beams. Modal data are obtained from experiment using Scanning Laser Vibrometer (SLV) and STAR software to extract the mode shape vectors from the experimental results. These are also compared with finite element simulations of the beams. The second case is an analytical example in which damage is simulated by reducing the area of one of the truss elements hypothetically by 50%. Results from these studies show a slight improved accuracy in determining the location of damage using an updated elemental stiffness matrix. For experimental results however, modal strain energy change method does not give an accurate location of the damages. There is need for further analysis of the application of modal strain energy techniques to damage identification. The results also demonstrate the potential of SLV as a structural health- monitoring tool.

Proceedings Article | 22 June 2000 Paper

Structural health monitoring using parameter identification methods

Pengxiang Liu, Vittal Rao

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388882

KEYWORDS: Motion models, Matrices, Systems modeling, System identification, Sensors, Structural health monitoring, Bridges, Computing systems, Finite element methods, Data modeling

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Proceedings Article | 21 June 2000 Paper

Distributed computing and sensing for structural health monitoring systems

Kyle Mitchell, Sridhar Sana, Pengxiang Liu, Krishnamohan Cingirikonda, Vittal Rao, Hardy Pottinger

Proceedings Volume 3990, (2000) https://doi.org/10.1117/12.388896

KEYWORDS: Error control coding, Wireless communications, Data communications, Sensors, Structural health monitoring, Distributed computing, Network architectures, Data processing, Computer architecture, Neural networks

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Showing 5 of 9 publications

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