High Bypass Turbofan Component Development. Modification 2

The assembly, instrumentation, and test of a fan shaft dynamics simulation vehicle was completed under this contract. Testing included low speed mechanical checkout, followed by operation up to 45,000 RPM using high speed model balancing, as required. The procedure was repeated for two sets of bearing support stiffness values. Balance sensitivity of the rotor system was investigated by creating various amounts of unbalance in the fan disk, the turbine disk, and the shaft, and recording the vibratory response up to 45,000 RPM. Finally, a ten-hour endurance test was conducted, completing the requirements of the contract.