Temperature dependence modeling and experimental evaluation of a multidimensional discrete magnetostrictive actuator

Active combustion control has shown a bright prospect for suppressing aero-engine combustion oscillations but also puts forward higher requirements for the actuator on the high bandwidth, large stroke, and high weight-power ratio. A multidimensional discrete magnetostrictive actuator proposed in our previous work can meet these requirements simultaneously. However, the temperature of the working environment around the aero-engine is high, so it is essential to further investigate the temperature-dependent characteristics of the actuator. In this paper, a multi-physics coupled temperature-dependent analytical model is developed, and the influence mechanism of temperature on the actuator is analyzed from the perspective of physics with a wide field of view from the material level to the actuator system level. Experiments based on a fabricated prototype were conducted and the results indicate that both the stroke, hysteresis, and closed-loop tracking performance of the actuator decrease with the increase in temperature, but the temperature has little effect on the frequency response; the proposed analytical model can accurately describe the temperature-dependent output characteristics of the multidimensional discrete magnetostrictive actuator, the root mean square error of which is less than 3% within 200 Hz.