Abstract
The present paper studies the whirl flutter stability of the TiltRotor Aeroelastic Stability Testbed (TRAST) using the comprehensive analysis code Rotorcraft Comprehensive Analysis System (RCAS). TRAST wing/pylon are systematically modeled in RCAS as beams based on a NASTRAN model starting with a spar and more sophisticated models are incrementally built up by adding components one at a time. Natural frequencies are compared with those of the NASTRANmodelat each step. The elastic wing/pylon beam model is then combined with an elastic gimballed rotor model and whirl flutter analysis is carried out. Wing and pylon aerodynamics are also added to the model and their effects on stability are examined. Pitch spring stiffness has an important influence on whirl flutter speed. Increased pitch spring stiffness has substantially extended the flutter boundary.
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