The V-22 tilt-rotor features an advanced HUMS system that will enable more efficient maintenance and more accurate structural life assessments based on individual aircraft usage. The primary system elements include on-board data recording, ground station data processing and structural life assessment database. This paper describes the analytical process of developing the damage tracking model for an early V-22 production NLG design that was determined to be life-limited during fatigue test. In order to maximize utility of the spares inventory, reduce life-cycle costs and increase operational availability, the V-22 NLG was identified as a top priority for early fleet damage tracking. The analytical process included development of landing and ground maneuver recognition logic, development and correlation of stress, fatigue and crack growth models for the critical keyway slot design feature, mapping of the processed flight recorder data to control point stresses and implementation of a strain-life damage calculation model on the SAFE system to enable calculation of FLE by serial number for affected fleet NLG.
展开▼
