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Proceedings Paper

Testing of a prototype velocity sensor with an internal feedback control loop
Author(s): Marco Gavagni; Alessandro Ronzoni; Paolo Gardonio; Stephen J. Elliott
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Paper Abstract

This paper discusses the design and testing of a new velocity sensor, designed to be used in combination with a piezoelectric patch actuator to form a closely located sensor-actuator pair for the implementation of active damping. The velocity sensor consists of a principal spring-mass seismic sensor with an embedded direct velocity feedback control loop. This internal feedback loop uses a control spring-mass seismic sensor and a reactive actuator which are fixed on the seismic mass of the principal sensor. The control gain is tuned to obtain two effects: first the output signal from the principal sensor becomes directly proportional to the base of the sensor itself and second, the fundamental resonance of the principal seismic sensor is cut down by the active damping effect of the internal loop. The background concepts of this sensor are first reviewed. The practical feasibility is then studied considering a prototype model. The stability of the internal feedback control loop has been assessed first. Following this, the frequency response function of the sensor without and with the internal feedback loop has been measured. The experimental measurements have shown that the internal feedback loop is conditionally stable but guarantees enough gain margins in order get the necessary control action to obtain the desired velocity output from the sensor. The sensor has been successfully tested with a closed loop, and shows the desired velocity output with no resonance at the fundamental natural frequency of the seismic sensor.

Paper Details

Date Published: 1 July 2005
PDF: 12 pages
Proc. SPIE 5836, Smart Sensors, Actuators, and MEMS II, (1 July 2005); doi: 10.1117/12.608630
Show Author Affiliations
Marco Gavagni, Univ. di Ferrara (Italy)
Alessandro Ronzoni, Univ. di Ferrara (Italy)
Paolo Gardonio, Univ. of Southampton (United Kingdom)
Stephen J. Elliott, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 5836:
Smart Sensors, Actuators, and MEMS II
Carles Cane; Jung-Chih Chiao; Fernando Vidal Verdu, Editor(s)

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