Speaker
Description
We have developed a broad and cohesive programme for tackling low-TRL technology items and the extreme systems-engineering challenges for ET Suspensions. Key elements of the programme are: the OmniSens experiment for active isolation in 6 DoF, development of novel sensors for suspension sensing and control, Femto + Optimal Controls models of complete suspension systems, and a structured approach to interfaces and requirements. We will present first results from OmniSens demonstrating system dynamics and translation-rotation separation. We will also show how optimal controls methods can be applied to multi-stage suspension damping in a way that conforms to GW-detector boundary conditions, with a pathway to experimental implementation at the AEI-10m prototype. Finally, we will show how these elements can be combined to produce a complete, controlled, state-space model of an ET-LF suspension that meets multiple challenging requirements beyond the simplest challenge of in-band residual seismic motion.