Neural Network Modeling of UH‐60A Pilot Vibration

Full‐scale flight‐test pilot floor vibration is modeled using neural networks and full‐scale wind tunnel test data for low speed level flight conditions. Neural network connections between the wind tunnel test data and the three flight test pilot vibration components (vertical, lateral, and longitudinal) are studied. Two full‐scale UH‐60A Black Hawk databases are used. The first database is the NASA/Army UH‐60A Airloads Program flight test database. The second database is the UH‐60A rotor‐only wind tunnel database that was acquired in the NASA Ames 80‐ by 120‐Foot Wind Tunnel with the Large Rotor Test Apparatus (LRTA). Using neural networks, the flight‐test pilot vibration is modeled using the wind tunnel rotating system hub accelerations, and separately, using the hub loads. The results show that the wind tunnel rotating system hub accelerations and the operating parameters can represent the flight test pilot vibration. The six components of the wind tunnel N/rev balance‐system hub loads and the operating parameters can also represent the flight test pilot vibration. The present neural network connections can significantly increase the value of wind tunnel testing.