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In a servo loop closure for an aircraft control surface, surface position from the control surface synchro is utilized to augment the servo motor rate feedback so as to reduce limit cycle oscillation. The high frequency content of surface position is suppressed by substituting a percentage of the lo

In a servo loop closure for an aircraft control surface, surface position from the control surface synchro is utilized to augment the servo motor rate feedback so as to reduce limit cycle oscillation. The high frequency content of surface position is suppressed by substituting a percentage of the low frequency content thereof for the same percentage of low frequency servo motor rate. This arrangement reduces control column activity normally associated with high effectiveness ratios of surface position for servo motor rate substitution.

대표청구항 ▼

Apparatus for suppressing oscillatory motion of a vehicle having at least one control surface for controlling vehicle attitude and an automatic control system for controlling said control surface, said control system including a positioning servo loop having a servo actuator motor coupled to said co

Apparatus for suppressing oscillatory motion of a vehicle having at least one control surface for controlling vehicle attitude and an automatic control system for controlling said control surface, said control system including a positioning servo loop having a servo actuator motor coupled to said control surface for positioning said control surface in response to a control surface position command, said positioning servo loop being closed by a feedback signal, said feedback signal being a combination of a first signal derived from said servo actuator motor and a second signal derived from said control surface, said first signal having a frequency band below a predetermined frequency (first low frequency band DL1) and a high frequency band above said predetermined frequency (first high frequency band DH1), said second signal having a frequency band below said predetermined frequency (second low frequency band DL2) and a frequency band above said predetermined frequency (second high frequency band DH2), said apparatus comprising means for suppressing said first low frequency band by a predetermined percentage, and means for substituting, in said first signal, said predetermined percentage of said second low frequency band for said suppressed predetermined percentage of said first low frequency band, thereby providing said feedback signal with a high frequency band above said predetermined frequency that is equal to said first high frequency band and a low frequency band below said predetermined frequency that is equal to said predetermined precentage of said second low frequency band.