Dynamically amplified whirling string actuator

Abstract

This work introduces a simple, dynamically amplified mechanical actuator incorporating a whirling string (or beam) as an active element. One of the ends of the string is fixed, while another is connected to an elastic spring. The operational principle of the device is based on the nonlinear coupling between the string’s lateral (radial) deflection rotating around the string’s axis and the axial displacement of the string’s end. Such a system may demonstrate a significant mechanical advantage between the force needed to sustain the rotation and the axial force at the string’s end.