Accession Number : ADA194157

Title :   General Rotorcraft Aeromechanical Stability Program (GRASP) Version 1.03 (User's Manual.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER

Personal Author(s) : Hopkins, A S ; Kunz, Donald L

PDF Url : ADA194157

Report Date : Feb 1988

Pagination or Media Count : 64

Abstract : The Rotorcraft Dynamics Division, Aeroflightdynamics Directorate, U.S. Army Aviation Research and Technology Activity has developed the General Rotorcraft Aeromechanical Stability Program (GRASP) to perform calculations that will assess the stability of rotorcraft in hovering flight and ground contact conditions. This computer program is designed to be a state-of-the-art, hybrid, finite-element/multibody code that can be applied to all existing and future helicopter configurations. While GRASP was specifically designed to solve rotorcraft stability problems, its innovative structure and formulation allow for applications to a wide range of structures. This manual describes the preparation of the input file required by Version 1.03 of GRASP, the procedures used to invoke GRASP on the NASA Ames Research Center Cray X-MP 48 computer, and the interpretation of the output produced by GRASP. The parameters used by the input file are defined, and summaries of the input file and the job control language are included. Keywords: Aeroelasticity; Rotary wings.

Descriptors :   *HELICOPTERS, *HOVERING, *AERODYNAMIC STABILITY, AEROELASTICITY, ARMY AVIATION, ARMY RESEARCH, BODIES, CODING, COMPUTER PROGRAMS, CONFIGURATIONS, CONTROL, FILES(RECORDS), FINITE ELEMENT ANALYSIS, FLIGHT, GROUND LEVEL, INPUT, JOBS, LANGUAGE, RANGE(EXTREMES), RESEARCH FACILITIES, ROTARY WING AIRCRAFT, ROTARY WINGS, STABILITY, STRUCTURES, USER MANUALS, HYBRID SIMULATION, SUPERCOMPUTERS, INPUT OUTPUT PROCESSING

Subject Categories : Aerodynamics
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE