Many dynamical systems use transducers that can function both as actuators and sensors. It is possible to continuously switch the functionality of the transducer elements in such systems and effectively use each element both as an actuator and a sensor. This provides the scope for significantly reducing the number of transducer elements required for complete controllability and observability of the system and hence reduce the hardware required for controlled system operation. In this paper we advocate underactuation and undersensing in dynamical systems with the objective of reducing cost, weight, and system complexity. To this end, we first illustrate the role of switching in enhancing controllability and observability in underactuated and undersensed linear time-invariant systems and determine the switching requirement for observer-based control designs. For a proof of principle, we consider the problem of vibration suppression in a flexible beam instrumented with piezoelectric transducers. Using simulation and experiments, we demonstrate feasibility of switching the piezoelectric elements between actuator and sensor modalities and establish the merit of introducing underactuation and undersensing deliberately.
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e-mail: mukherji@egr.msu.edu
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December 2004
Article
Enhancing Controllability and Observability in Underactuated and Undersensed Systems Through Switching: Application to Vibration Control
Shahin S. Nudehi,
Shahin S. Nudehi
Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226
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Ranjan Mukherjee, Assoc. Professor
e-mail: mukherji@egr.msu.edu
Ranjan Mukherjee, Assoc. Professor
Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226
Search for other works by this author on:
Shahin S. Nudehi
Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226
Ranjan Mukherjee, Assoc. Professor
Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824-1226
e-mail: mukherji@egr.msu.edu
Contributed by the Dynamic Systems, Measurement, and Control Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the ASME Dynamic Systems and Control Division September 18, 2003; final revision, June 8, 2004. Review conducted by: S. Devasia.
J. Dyn. Sys., Meas., Control. Dec 2004, 126(4): 790-799 (10 pages)
Published Online: March 11, 2005
Article history
Received:
September 18, 2003
Revised:
June 8, 2004
Online:
March 11, 2005
Citation
Nudehi , S. S., and Mukherjee, R. (March 11, 2005). "Enhancing Controllability and Observability in Underactuated and Undersensed Systems Through Switching: Application to Vibration Control ." ASME. J. Dyn. Sys., Meas., Control. December 2004; 126(4): 790–799. https://doi.org/10.1115/1.1850532
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