Perpustakaan Digital ITB

Piezoelectric actuators are widely used in various engineering applications due to their ability to convert electrical energy into mechanical deformation through electromechanical coupling. Building upon the enhancement of the finite element model from previous study, the objective of this study is to obtain the dynamic response of a cantilever beam system which is excited by piezoelectric actuator plate attached to the beam. The developed model consists of a cantilever transducer, a clamp, a flexible aluminium beam, and two Macro-Fiber Composite (MFC) actuators arranged in a bimorph configuration. The structural dimensions and experimental data used for validation were adopted from the previous study. The computational model was developed using electromechanically coupled finite elements and validated against the Euler-Bernoulli beam analytical solution and experimental data. The analyses included mesh convergence, modal analysis, and dynamic analyses in both the frequency and time domains. The validation of the simple cantilever beam yielded a first natural frequency of 5.47 Hz with an error of 1.28%. For the complete structure, the shell model predicted the first bending natural frequency of 8.93 Hz with an error of 0.28% relative to the experimental result. The frequency-domain analysis with a 400 V excitation and a frequency sweep from 0.1 to 15 Hz predicted a maximum beam-tip displacement of approximately 32 mm at a resonant frequency of 10.18 Hz. The time-domain analysis with a 400 V sinusoidal excitation applied from 0 to 20 s, followed by free vibration until 30 s, successfully reproduced the transition from forced vibration to free vibration. The results demonstrate that the developed finite element model can accurately predict the dynamic response of piezoelectric-actuated flexible structures.