Analysis of structures with rotating, flexible substructures applied to rotorcraft aeroelasticity in GRASPApplication to the General Rotorcraft Aeromechanical Stability Program (GRASP) of new methodology for structural dynamic analysis, including substructuring, frames of reference, nodes, finite elements, and constraints, is discussed. The structure is decomposed into a hierarchy of substructures, and discrete relative motion between substructures is analyzed exactly. The finite element method is used to treat deformation of continua, and the library of finite elements includes a nonlinear beam element incorporating aeroelastic effects. Analytical bases for the aeroelastic beam element and the screw constraint are considered, and the important role of geometric stiffness in the formulation is shown.
Document ID
19870046474
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hodges, Dewey H. (Georgia Institute of Technology Atlanta, United States)
Hopkins, A. Stewart (Georgia Inst. of Tech. Atlanta, GA, United States)
Kunz, Donald L. (NASA Ames Research Center; U.S. Army, Aeroflightdynamics Directorate, Moffett Field CA, United States)