V-22 MSC/NASTRAN Airframe Vibration Analysis And Correlation

The V-22 airframe structural design has been configured and tailored to achieve specific dynamic characteristics in order to minimize vibration and oscillatory loads and to provide good aeroelastic stability. An MSC/NASTRAN dynamics model has been developed and used as a design tool to achieve those characteristics. Ground vibration testing has been performed on both the ground test article (GTA) and the first flight aircraft, and flight testing has begun. This paper describes the tests and presents a comparison of test measurements with pretest predictions. Improvements made to the analytical model, based on the tests, are described, and a correlation of the improved model to test data is presented.