Drivetrain torsional stability controlling system for helicopter, has correction device to correct measured speed to obtain value exhibiting same modulus, opposite phase relative to preset value around torsional mode of drivetrain

摘要

The system has a correction device (9) to correct a measured speed NTL into a corrected value. A determination unit (11) detects a preset value for the speed of rotation of a free turbine of an engine (5). The device (9) corrects the measured speed to obtain a corrected value exhibiting same modulus and an opposite phase with respect to the preset value around torsional mode of a drivetrain. An Independent claim is also included for a process of determining a correction law implemented by a correction device.