Stochastic modeling of uncertainties in the piezoelectric coupling coefficient in arbitrary shell structures
Francisco Scinocca1; Airton Nabarrete1
1 Instituto Tecnológico de Aeronáutica
doi:10.20906/CPS/USM-2016-0067
Resumo
The analysis of uncertainties is extremely important during the project conception phase of vibration control systems, supporting scientists and engineers to obtain effectiveness in the vibration attenuation. For that, the present paper proposes a systematic approach to quantify the uncertainties when piezoelectric transducers are applied in arbitrary thin shell structures with asymmetric double curvature. These types of structures are of interest in the automotive or aeronautical applications. The variability in the optimal piezoelectric electromechanical coupling coefficient and in the dynamic behavior of the mechanical structure were studied in details. The randomness effects arising from the manufacturing process, such as stamping spring back effects, as well as in the boundary conditions, were taken into account in the analysis. Likewise, the effects of variability during the PZT patch positioning. Sensitivity and spectral analysis were employed to study the impact of randomness in the optimal piezoelectric transducer implementation for typical real applications.
Palavras-chave: Uncertainty Quantification Analysis; Stochastic Finite Element Method; Monte Carlo Simulation; Piezoelectric Optimization; Stochastic Model Updating.