Comprehensive UH-60 Loads Model Validation

A comprehensive UH-60 multibody model has been developed in DYMORE. A novel combined analytical and experimental approach is implemented that modifies the externally applied loads to obtain a better agreement between numerical predictions and experimental measurements. The iterative algorithm operates in the modal domain, and at convergence of the corrected external loads, confluence of the numerical predictions and experimental measurements is achieved. The proposed confluence algorithm is validated with 111 flight test cases selected from the NASA TRENDS UH-60 flight test database across a wide range of flight conditions. Simulation results are compared to flight test data before and after application of the confluence algorithm. The confluence algorithm vastly improves correlation of the simulation to the flight test data, both in peak-to-peak load values and frequency content.