Nonlinear coupled dynamics of a wearable sensor in the presence of a soft dielectric layer undergoing squeezing motion

This article presents a modelling approach for wearable capacitive sensors utilizing dielectric materials with low Young’s modulus and high polarization capability. The objective is to reduce the working voltage to ensure compatibility with the human body, enabling the sensor to be used as a wearable device. In contrast to conventional modelling techniques, which often employ beams on elastic foundations with continuous springs, this study considers the inertial forces of the dielectric layer. The study derives and discretizes the nonlinear motion equations of the microbeam and the elastomeric dielectric layer and investigates the steady-state response of a system subjected to pressure with constant and harmonic fluctuation components, as well as a biasing voltage, using a learning approach. The study concludes that the elastomeric dielectric layer can significantly enhance the system’s performance. This is because it allows for the creation and production of wearable sensors that require less electrostatic voltage to operate.