Presentation Information
[N-1-30]Sensor-Informed Modeling of Pressure--Peltier-Temperature Hysteresis in Phase-Change Pouch Actuators
〇Fante Liu1, Cedric Caremel1, Tung Duc Ta2, Yeman Fan1, Feng Dai1, Yoshihiro Kawahara1, Mitsuhiro Kamezaki1 (1. The University of Tokyo, 2. Keio University)
Keywords:
phase-change actuator,hysteresis,thermodynamic modeling,soft actuator
Liquid-to-gas phase-change pouch actuators generate compliant pressure through vaporization, but their pressure response depends on hidden thermal states and path-dependent phase-change behavior. This study investigates sensor-informed pressure modeling using measured Peltier temperature for a Novec 7000 pouch actuator. We first show that the measured pressure-Peltier-temperature trajectory forms distinct heating and cooling branches, indicating that a static temperature-to-pressure map is insufficient. We then compare an input-driven thermal model with a sensor-informed model that receives measured Peltier temperature during a temporal test segment. On 1,208 unseen samples, the sensor-informed model reduced pressure RMSE from 6.28 kPa to 2.27 kPa, corresponding to a 64% reduction, and improved pressure R2 from 0.585 to 0.946. These results suggest that Peltier-temperature sensing provides useful thermal-boundary information for compact modeling of phase-change pouch actuators.