COMPREHENSIVE AEROMECHANICS ANALYSIS OF COMPLEX ROTORCRAFT USING 2GCHAS

2GCHAS is a comprehensive, multi-disciplinary, computer software syste m for predicting rotorcraft aeromechanics characteristics, It is a fin ite element based system with a variety of aerodynamic modeling option s and provides modeling and analysis flexibility, prediction accuracy, and user-friendly input and output, The software is maintainable, exp andable, and transportable to various computer platforms. The paper br iefly describes the development of the System and key features for mod eling complex rotorcraft, A series of rotorcraft analysis problems is presented to illustrate the range of capabilities available, including single and tandem rotor helicopters with engine/drive trains and feed back flight control systems, Various aerodynamic airloads, rotor wake, and component interference models are used in calculating performance , flight dynamic response, rotor loads and vibrations, and aeroelastic stability.