Steering Mirror Design and Dynamic Controls for a Dual-actuation Platform Using High-strain Actuators

Abstract

This manuscript discusses several novel design approaches to enhance dynamic precision of electro-mechanical positioning systems. In particular, a detailed development program for fast steering mirrors is addressed and various unique metrology and motion control strategies are presented. In general, material developments are continually advancing lightweight mirror structures such as the implementation of silicon carbide (SIC) materials to provide higher mechanical bandwidth response. Additionally, electro-mechanical actuators must continue to advance in conjunction with the mirror technologies in order meet stringent performance specifications (i.e. power requirements, weight, and precision dynamic response). The technologies developed through this development effort include; ultra-high strain piezoelectric actuators for enhanced motion control performance, a novel mechanism design employing a dual actuation platform to provide high bandwidth response and long-range, high-precision capability, innovative controller methodologies for the series coarse/fine system and active attenuation of dynamic reaction forces, integration of energy absorbing foams to enhance dynamic control, and real-time precision digital controllers.