Design and optimization of a bias SMA flap actuator in a fluid-structure application

Pedro Batista Camara Leal¹; Marcelo Amorim Savi¹

¹ Universidade Federal do Rio de Janeiro

doi:10.20906/CPS/CON-2016-0562

Resumo

As an effort to create efficient and lighter flap actuators via the use of shape memory alloy actuators (SMA), the main objective of this work is to demonstrate the viability and capability of SMA wires as flap actuators in a bias configuration. Numerical modeling via a Hartl-Lagoudas constitutive model of the SMA actuators is undertaken. The flap is modeled by a static rigid-body with a single actuator under aerodynamic loads calculated via panel method in a fluid-structure-interaction framework. Elastic spring properties, pre-strain, positioning of the actuators and final actuation temperature are optimized via a genetic optimization for two different problems. The first optimization focuses on maximizing the trailing edge displacement. The second optimization also maximizes the flap deflection, but also minimizes the bias spring coefficient in order to have a more realistic actuator. Each optimization is implemented and significant flap deflections are obtained.

Palavras-chave: shape memory alloy; fluid-structure; dynamics