Design and Modeling of a Self-Sensing Micro-Vibration Isolation System Utilizing a Lightweight Electret-Based Transducer for Space Applications

A compact and lightweight sensor is always expected to be embedded with the traditional micro-vibration isolator in spacecraft. It helps to detect the subtle disturbances the isolator encounters and alerts for potential harm. In this work, we developed a self-sensing micro-vibration isolator using an electret transducer. The theoretical models of the electret-based self-sensing isolator are derived from Hamilton's principle to investigate the coupled dynamics of the system and guide a model-based design. Simulations via the finite element method were also conducted to verify and extend the effectiveness of the proposed model. The results show that the electret transducer is an excellent candidate for the embedded sensor of the micro-vibration isolator. With the proper size and appropriate deployment pattern, the electret sensors can precisely detect the translation and rotation of the unsprung load.