NEW METHODS FOR ROTOR TRACKING AND BALANCE TUNING AND DEFECT DETECTION APPLIED TO EUROCOPTER PRODUCTS

The purpose of helicopter rotor "track and balance" adjustment is to provide a low vibratory level in 1 per rev along the 3 aircraft axes, to ensure optimized crew and passenger comfort. This adjustment is performed systematically after manufacturing, that is to say before the first flight as well as after any rotor maintenance intervention. It can also be carried out at any time at the customer's request. This document introduces a new rotor adjustment methodology based on a learning and adjustment technique by neural networks, ensuring minimized fuselage vibration (on first harmonics of the rotor frequency) in as many points as desirable, along the three axes, and in one or two adjustment flights only.