초록 ▼

A stability augmentation system utilizing a limited authority series actuator has an adaptive washout circuit which automatically reduces the effective washout system washout time constant as a function of attitude error or series actuator displacement. For small errors and for disturbances due to g

A stability augmentation system utilizing a limited authority series actuator has an adaptive washout circuit which automatically reduces the effective washout system washout time constant as a function of attitude error or series actuator displacement. For small errors and for disturbances due to gusting winds, the system washout time constants are slow, thus providing good stability. For large errors the circuit smoothly reduces the time constants to keep the series actuators from saturating.

대표청구항 ▼

In a stability augmentation system for navigable craft including a body mounted attitude sensor for providing an attitude signal representing motion of said craft about an axis thereof, actuator means responsive to an error signal derived from said attitude signal for stabilizing said craft said axi

In a stability augmentation system for navigable craft including a body mounted attitude sensor for providing an attitude signal representing motion of said craft about an axis thereof, actuator means responsive to an error signal derived from said attitude signal for stabilizing said craft said axis, said actuator means having a limited displacement capacity from a reference position and tending to reach the limit of said displacement capacity in response to large amplitude error signals, and maneuver control means for maneuvering said craft about said axis, an apparatus for preventing said actuator means for reaching said limit comprising: error sensing means responsive to said attitude signal and to said maneuver control means for providing said error signal for driving said actuator means, first washout means coupled to said actuator means for providing a first washout signal of opposite polarity to said error signal and of variable magnitude and time constant to thereby reposition said actuator means towards said reference position, and control means providing a control signal for controlling the magnitude and time constant of said first washout signal in accordance with the displacement of said actuator means, said control signal causing said magnitude to increase and said time constant to decrease as said displacement approaches said limit.