Distributed four-layer PVDF actuator/sensor arrangement for the control of beam motion

Young-Sup Lee; Stephen J. Elliott; Paolo Gardonio

doi:10.1117/12.436483

21 August 2001 Distributed four-layer PVDF actuator/sensor arrangement for the control of beam motion

Young-Sup Lee, Stephen J. Elliott, Paolo Gardonio

Proceedings Volume 4326, Smart Structures and Materials 2001: Modeling, Signal Processing, and Control in Smart Structures; (2001) https://doi.org/10.1117/12.436483
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

This paper presents a study of a distributed arrangement of double PVDF actuator/sensor pairs bonded on a cantilever beam for the control of vibration at the tip. The arrangement of a single PVDF actuator/sensor pair, in practice, is known to be non-minimum phase due to coupling between in-plane motion and out-of-plane motion. This means that a single pair arrangement does not have the conventional driving-point collocated system property. The stability and performance of the arrangement are limited by finite feedback gains, which can be used with direct velocity feedback control. A double pair arrangement using four layers of PVDF has thus been suggested to overcome this problem. Theoretically, when both the actuator pair and the sensor pair are working out-of-phase, then the response becomes minimum phase since in-plane motion cannot be excited or detected. A smart beam with double PVDF actuator/sensor pairs has been implemented. A triangular shaped actuator/sensor pair was bonded on each side of the beam. The initial experimental measurements with individual pairs of transducers showed a good reciprocity and a strong coupling between out-of-plane and in-plane responses. All the four layers have then been used as out-of-phase actuators and sensors to attempt to measure only the out-of-plane response. However, in practice, this compensation method was found not to discriminate against the in-plane response, due to the direct coupling between the actuation and sensing transducers due to their finite thickness and compliance. Therefore, the four layers smart beam does not have a minimum phase property. A new arrangement of actuator/sensor pair for in-plane compensation is then suggested and discussed.

Citation Download Citation

Young-Sup Lee, Stephen J. Elliott, and Paolo Gardonio "Distributed four-layer PVDF actuator/sensor arrangement for the control of beam motion", Proc. SPIE 4326, Smart Structures and Materials 2001: Modeling, Signal Processing, and Control in Smart Structures, (21 August 2001); https://doi.org/10.1117/12.436483

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