Shape Memory Actuator Design Based on a Numerical Simulation

摘要

The dynamic properties of straight shape memory alloy-actuator wires (SMA) are characterised by the rate of heating and cooling procedures. Based on an analysis of energy fluxes into and out of the actuator a numerical model that simulates the time-response of SMA-wires is presented. Cause variables that have an impact on the actuator's behaviour (actuator's geometry, provided load, arbitrary time variant heating current, environmental conditions) can easily be parameterised in the model. This tool enables a simple design and layout for technical solutions with SMA-actuators. The simulation results are validated experimentally and the optimisation of a rotatory drive system powered by straight SMA-actuator wires is presented.