Anadvaneedbesm Bnaeelement hls been developed for modeling rotor blade dynamics and aeroelastieity. This element is part of the Element Library of the Second Generation Comprehensive Helicopter Analysls System (ZGCHAS). The element allo~smodeling ofarbitrary rotor systems, including bearingless rotors. It accounts far moderately large elastic deflections. anisotro~ic ~ra~erties. laree frame motion for maneuver simulation. and allows for variable order shape functinnr. The effeel oE eravits. ~echanieallv soolied and s e d m a m i e loads s're Included. All kinematic auanti&. .. required to compute airlaads are provided. In thiv paper, the fundarnt.nhl ~aurnptiunr and derivalinn ofthc element mstrices ore prrrmtrd. Numerical results "re rhoun lo verify the furmulalion and illuslralc rnrral featurcs of the element.Paper pmenled M the h e c a n Helicopter Smiely RolorcmR Basic Research Conference. M m h iWI. AUanfa. Georgja *mi$ wakmpafamrdwbilethe aulhon w a e employed at McDonnell Douglas orientation of A frame relative to B frame strain energy element internal displacements work done by body and applied forces element length coordinate element nodal displacement vector total twist built-in structural twist blade feathering control angle torsional deflection element shape function value at x rotor azimuth angle angular velocity of A frame relative to B frame, in components of B frame
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