(b) The Model of LLPC. The schematic diagram of a single DOF AVIS with absolute velocity feedback control and LLPC feedforward control is shown in Figure 11.
The closed loop transfer function of a single DOF AVIS with absolute velocity feedback control and LLPC feedforward control can be organized as
Based on sky-hook damping, LLPC can further reduce the amplitude of transmissibility.
The blue dot line shows the situation in the condition of closed loop (AHC: sky-hook damping feedback and LLPC feedforward) state.
In order to further improve the performance and reduce the residual vibration of the payload platform, LLPC feedforward control is adopted.
Velocity feedforward of base platform is adopted to build a LLPC control technology in FFAC technology.