General Rotorcraft Aeromechanical Stability Program (GRASP) - Theory Manual
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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The Rotorcraft Dynamics Division, Aeroflightdynamics Directorate, U. S. Army Aviation Research and Technology Activity AVSCOM has developed the General Rotorcraft Aeromechanical Stability Program GRASP to calculate aeroelastic stability for rotorcraft in hovering flight, vertical flight, and ground contact conditions. In this report, GRASP is described in terms of its capabilities and the philosophy behind its modeling. The equations of motion that govern the physical system are described, as well as the analytical approximations used to derive the equations. These equations include the kinematical equation, the element equations, and the constraint equations. In addition, the solution procedures used by GRASP are described.
- Fluid Mechanics