Eventos Anais de eventos
MecSol 2017
6th International Symposium on Solid Mechanics
SENSITIVITY ANALYSIS FOR TOPOLOGY OPTIMIZATION OF NONLINEAR FLUID ACTUATORS
Submission Author:
Daniel Candeloro Cunha , SP
Co-Authors:
Renato Pavanello
Presenter: Daniel Candeloro Cunha
doi://10.26678/ABCM.MecSol2017.MSL17-0060
Abstract
Some biological cellular systems behave as highly energy-efficient fluid actuators with very desirable features, as lightweight, simple input and large actuation. Seeking such features, this work developed the primary stages for designing bio-inspired fluid actuators, based on nastic plants. For modeling the system, it was considered a continuum solid structure of homogeneous and isotropic material with linear stress-strain relationship, internally loaded by pressured fluid cavities. The compliant mechanism transmits, through a transmittance ratio, the available pressure energy to a set of specified springs, whose total strain energy represents the output work. In current approach, the fluid was stationary and the input pressure was the same for all cavities. Two nonlinear aspects were considered. Geometrical nonlinearity, since compliant mechanisms are expected to work under finite displacements. And load nonlinearity, since the loads depend on the deformed structure configuration. The mechanism outlines were described and its finite element model was developed and validated. Furthermore, aiming for the design of those actuators through topology optimization techniques, a sensitivity analysis was formulated as a systematical way to guide the optimization process. Sensitivity numbers were obtained for maximizing two different objective functions: output work and transmittance ratio. The results were satisfactory when compared with the sensitivity values obtained from an exhaustive numerical analysis.
Keywords
fluid actuator, Nonlinear, Topology optimization, Sensitivity analysis
