Improving E-ELT M1 prototype hard position actuators with active damping

摘要

During the advanced design phase of the European Extremely Large Telescope (E-ELT) several critical components have been prototyped. In particular, a representative section of the E-ELT primary mirror has been assembled. It is equipped with complete prototype segment subunits including prototype edge sensors and position actuators. One purpose is to test various control strategies and evaluate the achievable performance. One of the segment subunits is equipped with three prototype hard actuators, i.e. typically piezo actuators being passively stiff. To improve such type of position actuators various active damping techniques were implemented and tested. In this paper an active damping strategy based on positive position feedback is introduced. The theoretical and implementation test results are presented. This also includes results related to vibration transmission.