Travelling waves in boundary-controlled, non-uniform, cascaded lumped systems

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Title: Travelling waves in boundary-controlled, non-uniform, cascaded lumped systems
Authors: O'Connor, William
Zhu, Ming
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Date: Aug-2013
Abstract: A companion paper in this conference considers travelling and standing waves in cascaded, lumped, mass-spring systems, controlled by two boundary actuators, one at each end, when the system is uniform. It first proposes definitions of waves in finite lumped systems. It then shows how to control the actuators to establish desired waves from rest, and maintain them despite disturbances. The present paper extends this work to the more general, non-uniform case, when mass and spring values are arbitrary. A special "bi-uniform" case is first studied, consisting of two different uniform cascaded systems in series, with an obvious, uncontrolled, impedance mismatch where they meet. The paper shows how boundary actuator control systems can be designed to establish, and robustly maintain, apparently pure travelling waves of constant amplitude in either the first or the second uniform section, in each case with an appropriate standing wave pattern in the other section. Then a more general non-uniform case is studied. A definition of a "pure travelling wave" in non-uniform systems is proposed. Curiously, it does not imply constant amplitude motion. It does however yield maximum power transfer between boundary actuators. The definition, and its implementation in a control system, involves extending the notions of "pure" travelling waves, standing waves, and input and output impedances of sources and loads, when applied to non-uniform lumped systems. Practical, robust control strategies are presented for all cases.
Type of material: Conference Publication
Publisher: Elsevier
Journal: Mechanical Systems and Signal Processing
Volume: 39
Issue: 1-2
Start page: 108
End page: 118
Copyright (published version): 2012 Elsevier B.V.
Keywords: Travelling wavesStanding wavesLumped systemsNon-uniform structuresPower transferMechanical impedance
DOI: 10.1016/j.ymssp.2012.08.024
Language: en
Status of Item: Peer reviewed
Conference Details: The 2nd Joint International Conference on Multibody System Dynamics, Stuttgart, Germany, May, 2012
Appears in Collections:Mechanical & Materials Engineering Research Collection

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