System identification of servo-hydraulic system with outer-loop control

The goal of this experiment is to evaluate the performance of actuator controllers in the frequency domain. A band-limited white noise (BLWN) from 0 to 50 Hz with a displacement RMS of 0.254 mm was commanded to experimentally determine the servo-hydraulic system transfer function with outer-loop control. Controllers were designed to match the specimen conditions. Variations include: a. 0.0 Amps in damper, CDM controller b. 0.0 Amps in damper, CDM w/FB controller c. 2.5 Amps in damper, BDM controller d. 2.5 Amps in damper, BDM w/FB controller with feedback