L. Ciccarelli¹, E. Bodo², V. Bello², S. Merlo², S. Morganti² 1 Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 3, 27100, Pavia, Italy, lucia.ciccarelli01@universitadipavia.it, 2 Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Via Ferrata 5, 27100, Pavia, Italy, elisabetta.bodo01@universitadipavia.it, valentina.bello@unipv.it, sabina.merlo@unipv.it, simone.morganti@unipv.it Key Words: Finite element method, Elecromechanical coupling, Piezoelectric acoustic speaker, Ceramic actuator, Sound pressure level In recent years, the demand for thin speakers has increased due to the emerging trend toward more compact portable (e.g., smartphone) and wearable (e.g., smartwatch) devices. Although conventional magnetic speakers are widely used in audio applications, they have limiting factors such as their thickness (about 3 mm), weight and composition [1]. Piezoelectric loudspeakers have become a popular choice in small electronic devices because they are designed to be thin (about 1 mm) [1-2]. A computational model of generic resonant surfaces driven by a piezoelectric device is presented, aimed at predicting the mechanical and acoustic behaviour associated with the use of the actuator. Vibration modes obtained through modal analysis were used in the experimental tests to acquire the interferometric measurements at the positions where maximum displacement is expected; results related to experimental-numerical comparison are discussed. Finally, preliminary results of the sound pressure level generated by the vibration of a mechanical system are presented. REFERENCES [1] KIM, Hye Jin, et al. High performance piezoelectric microspeakers and thin speaker array system. ETRI journal, 31.6: 680-687, 2009. 2] KIM, H. J.; YANG, W. S.; NO, Kwang-Soo. The vibrational characteristics of the triplelayered multimorph ceramics for high performance piezoelectric acoustic actuators. Journal of Electroceramics, 33: 53-63, 2014.