Dynamics modeling of ferromagnetic shape memory alloys (FSMA) actuators

Abstract

FSMAs like Ni2MnGa have attracted significant attention over the last few years. As actuators, these materials offer high energy density, large stroke, and high bandwidth. These properties make FSMAs potential candidates for developing Solid-Fluid Hybrid Actuations (SFHA), where the FSMA actuator provides the mechanical energy by the linear reversible displacements. In order to develop effective hydraulic pumps with the FSMA actuators, it is important to study the dynamic behavior in these materials. In this paper, a dynamic model is presented for an Ni 2 MnGa actuator. The Ni 2 MnGa actuator model consists of the dynamics of the actuator, kinematics of the actuator, constitutive model of the material, and reorientation kinetics. A constitutive model is proposed to take into account the elastic deformation as well as the reorientation. Simulations results are presented to demonstrate the dynamic behavior of the actuator.

Tracking Control of a Magnetic Shape Memory Actuator Using an Inverse Preisach Model with Modified Fuzzy Sliding Mode Control

“…Gauthier et al [ 15 ] combined thermodynamics with Lagrangian formalism and its Hamiltonian extension as a dynamical model for an MSM alloy-based actuator. Tan and Elahinia [ 16 ] described the dynamic behavior of a MSM actuator by combining its constitutive model, the reorientation kinetics, the kinematic model, and the dynamic model of the actuator. In these kinds of models, a complete understanding of the material structure and energy flow are necessary.…”

Hysteresis Analysis and Positioning Control for a Magnetic Shape Memory Actuator

“…Gauthier et al [ 12 , 13 ] provided models for chemical energy, thermal energy, mechanical energy, and magnetic energy, to explain the rearrangement process between martensite variants in an MSM alloy. For the purpose of controlling the MSM actuator, Tan and Elahinia [ 14 ] combined the physical models with whole system models, including kinematics of MSM actuator and electromagnetic model. However, physical models are complex since they need to concern all the factors that can influence the variants of MSM alloys.…”