TY - JOUR
ID - 15731
TI - Stress Control of a Piezoelectric Lumped-element Model − Theoretical Investigation and Experimental Realization
JO - Journal of Applied and Computational Mechanics
JA - JACM
LA - en
SN -
AU - Schoeftner, Juergen
AU - Brandl, Andreas
AU - Irschik, Hans
AD - Institute of Technical Mechanics, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria
Y1 - 2021
PY - 2021
VL - 7
IS - Special Issue
SP - 1110
EP - 1120
KW - piezoelectric control
KW - stress control
KW - Structural control
KW - fatigue and damage
KW - lumped parameter system
DO - 10.22055/jacm.2020.33327.2203
N2 - This contribution focuses on force- and stress-tracking of a multi-degree of freedom system by eigenstrain actuation. The example under consideration is an axially excited piezoelectric bar which can be modeled as a lumped parameter system. The piezoelectric effect serves as actuation source and the question is answered how to prescribe the piezoelectric actuation in order to achieve a desired stress distribution, or, in the lumped case, a desired distribution of internal forces. First, the equations of motion are set up in matrix notation where the state vector contains the displacement components. After some basic manipulations, the governing equation can be written in terms of the internal force vector. Now, if one intends to have a certain desired internal force distribution, it is straightforward to find a condition for the piezoelectric control actuation. The developed theory is first verified by using a continuous piezoelectric bar, where the motion of one end is prescribed. Then the theory is experimentally verified: a lumped two-degree of freedom system is investigated and the goal is to reduce the stress or the internal force in order to avoid mechanical damage. The force-controlled configuration is exposed to a sweep-signal excitation between 1000−4900 Hz, running for 22 minutes without any signs of damage. Then the same system is excited by the same excitation but without piezoelectric control. After some seconds the test sample is visibly damaged, going along with a significant reduction of the first eigenfrequency. This gives strong evidence for the appropriateness of the proposed stress or force control methodology.
UR - https://jacm.scu.ac.ir/article_15731.html
L1 - https://jacm.scu.ac.ir/article_15731_e94dc61b8007539ed715e838b7ca7177.pdf
ER -