Novel approach to self-sensing actuation

Lowell D. Jones; Ephrahim Garcia

doi:10.1117/12.275655

6 June 1997 Novel approach to self-sensing actuation

Lowell D. Jones, Ephrahim Garcia

Proceedings Volume 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems; (1997) https://doi.org/10.1117/12.275655
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

Self-sensing approaches for controlling piezoelectric materials thus far have been composed of slight variations on a theme; the theme being a linear bridge technique for extracting the self-sensing signal. Linear bridge-based self- sensing however has always been plagued with problems of impedance mismatching, drift, and instability, all due to the nonlinearities inherent in piezomaterials. Additionally, all past self-sensing research has been limited to strictly ac sensing applications, hence the abundance of vibration suppression papers. We propose a novel self-sensing technique which shows promise in reducing most if not all of these problems. The approach dubbed OBSS (observer based self- sensing) is akin to state estimation techniques in that is uses electric field and electric displacement information coupled with the linear piezoelectric constitutive relations to estimate the material's stress and strain states. Additionally, since most piezomaterials exhibit significant hysteresis, a real-time compensation method using the generalized Maxwell slip hysteresis model must be employed to minimize this nonlinear effect. Theoretical development and experimental validation of the OBSS technique is presented.

Citation Download Citation

Lowell D. Jones and Ephrahim Garcia "Novel approach to self-sensing actuation", Proc. SPIE 3041, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, (6 June 1997); https://doi.org/10.1117/12.275655

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