TY  - JOUR
T1  - A Comparison of Axisymmetric Models of Multilayer Piezo
Actuators for the Creation of Annular Strain Waves
AU - Vinogradov, Alexander AU - Yegor, Yegor Matveev AU - Lubchenko, Roman AU - Titov, Pavel 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 4
SP  - 940
EP  - 953
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.940.953
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.940.953
KW  - Multilayer piezo actuator
KW  -bimorph
KW  -unimorph
KW  -FEM
KW  -membranes
KW  -ceramic disks
AB  - This study presents the theoretical results of a comparative analysis of axisymmetric models of piezo
actuators with a bimorph and unimorph structures. The unimorph actuator contains ring elements that are
fastened to a round metal base. The bimorph actuator has two bound identical piezo ceramic disks with
a thin-film electrode between them: the outer surfaces of the disks are covered with thin silver ring electrodes.
Different voltages are applied to the ring parts which deforms the bend and creates a system of ring
protuberances and depressions. Such actuators are relatively new in piezo engineering-literature does not
describe a methodology of their design or comparative analysis. This research is relevant for the choice of an
optimal scheme of further development. Quasi-static models are constructed according to the circuits of
initiation of bend strains in the multilayer piezoelectric structures (disks, rings and membranes). Special software
for their calculation was developed. The results of modeling of bimorphs and unimorphs with ring electrodes
were obtained via. the analytical methods and the finite element methods; test models were compared to known
designs. The study found that a unimorph with a base with an optimized thickness had greater strains than the
bimorph did. Furthermore, the bimorph contained two times as many double-ended electrodes which
complicated its structure and limited its application in micropumps without additional protective means which
reduce its energy efficiency. As a result, the preferred model is that of a unimorph that serves as a piezo
actuator for the creation of annular waves.
ER  -