Force equalisation in torque-summed electromechanical actuators

Progress in Redundant Electromechanical Actuators for Aerospace Applications

“…With this system (illustrated in Figure 17 As designs of actuators with redundancy are becoming a normal trend, more researchers have started focussing on addressing the possibility of FF between mismatched As designs of actuators with redundancy are becoming a normal trend, more researchers have started focussing on addressing the possibility of FF between mismatched lanes. One of the most recent approaches was reported in [88], where a comprehensive study was conducted to investigate FF in the four-lane torque-summed electromechanical architecture shown in Figure 18. The design offers redundancy in lane failures and hence meets the expected fail-operational/fail-safe specification.…”

“…To ensure total mo clutches were included in the design to physically disconnect faulty lanes [40 The study considered commercial motors and feedback transducers wit ances. The analysis considered extreme cases where motors delivered extr and feedback transducers experienced high tolerances [88]. Two types of a were presented and compared: one considered FE while the other did not Figure 18 shows the four-lane consolidation and Figure 19 shows the control s diagram of the FE architecture.…”

“…space 2023, 10, x FOR PEER REVIEW 18 of lanes. One of the most recent approaches was reported in [88], where a comprehensi study was conducted to investigate FF in the four-lane torque-summed electromechani architecture shown in Figure 18. The design offers redundancy in lane failures and hen meets the expected fail-operational/fail-safe specification.…”

“…The study considered commercial motors and feedback transducers with high tol ances. The analysis considered extreme cases where motors delivered extreme torqu and feedback transducers experienced high tolerances [88]. Two types of architectur were presented and compared: one considered FE while the other did not consider F Figure 18 shows the four-lane consolidation and Figure 19 shows the control system blo diagram of the FE architecture.…”

Force Equalization Control of Redundant Electromechanical Actuation System by FOPID and Current Feedforward

“…To fulfill the safety requirements of FAR25.1309 airworthiness regulations for a flight control system with extremely low failure probability, modern civil aircraft flight control surfaces are generally arranged with a redundant configuration of two or more actuators, and the surfaces are driven in the active-active working mode [3] . There is a serious force fight in the dual redundant electromechanical actuation system performing in active-active mode: The electromechanical actuation system is a complicated system with high stiffness, strong coupling, and nonlinearity, in the system response , the dynamic response characteristics of the two actuators acting together on the surface are different, and there is always an output torque imbalance called force fight, which will adversely affect the surface stability and system power, the long-term force fight may even lead to fatigue failure problem, decreasing the payload of the actuation system and even resulting in airfoil fatigue affecting the flight safety [5] . This puts forward higher requirements for force fight control method of the electromechanical actuation system in active-active mode.…”