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There are a total of 46 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Application of GRASP (General Rotorcraft Aeromechanical Stability Program) to nonlinear analysis of a cantilever beam
Author(s): Hinnant, Howard E.; Hodges, Dewey H.
Abstract: The General Rotorcraft Aeromechanical Stability Program (GRASP) was developed to analyse the steady-state and linearized dynamic behavior of rotorcraft in hovering and axial flight conditions. Because of the nature of ...
NASA Center: Ames Research Center
Publication Year: 1987
Added to NTRS: 2008-08-05
Accession Number: 87N27660; Document ID: 19870018227; Report Number: AD-A182324, NAS 1.15:89222, NASA-TM-89222
Forces Associated with Nonlinear Nonholonomic Constraint Equations
Author(s): Roithmayr, Carlos M.; Hodges, Dewey H.
Abstract: A concise method has been formulated for identifying a set of forces needed to constrain the behavior of a mechanical system, modeled as a set of particles and rigid bodies, when it is subject to motion constraints described ...
NASA Center: Langley Research Center
Publication Year: 2008
Added to NTRS: 2008-07-09
Document ID: 20080022934
A finite element based method for solution of optimal control problems
Author(s): Bless, Robert R.; Hodges, Dewey H.; Calise, Anthony J.
Abstract: A temporal finite element based on a mixed form of the Hamiltonian weak principle is presented for optimal control problems. The mixed form of this principle contains both states and costates as primary variables that are ...
NASA Center: NASA (non Center Specific)
Publication Year: 1989
Added to NTRS: 2008-05-31
Accession Number: 90N23027; Document ID: 19900013711
Rotorcraft aeroelastic stability
Author(s): Ormiston, Robert A.; Warmbrodt, William G.; Hodges, Dewey H.; Peters, David A.
Abstract: Theoretical and experimental developments in the aeroelastic and aeromechanical stability of helicopters and tilt-rotor aircraft are addressed. Included are the underlying nonlinear structural mechanics of slender rotating ...
NASA Center: Ames Research Center
Publication Year: 1988
Added to NTRS: 2008-05-30
Accession Number: 88N16631; Document ID: 19880007248
Effects of static equilibrium and higher-order nonlinearities on rotor blade stability in hover
Author(s): Crespodasilva, Marcelo R. M.; Hodges, Dewey H.
Abstract: The equilibrium and stability of the coupled elastic lead/lag, flap, and torsion motion of a cantilever rotor blade in hover are addressed, and the influence of several higher-order terms in the equations of motion of the ...
NASA Center: NASA (non Center Specific)
Publication Year: 1988
Added to NTRS: 2008-05-30
Accession Number: 88N27157; Document ID: 19880017773
Corrigendum: New Form of Kane's Equations of Motion for Constrained Systems
Author(s): Roithmayr, Carlos M.; Bajodah, Abdulrahman H.; Hodges, Dewey H.; Chen, Ye-Hwa
Abstract: A correction to the previously published article "New Form of Kane's Equations of Motion for Constrained Systems" is presented. Misuse of the transformation matrix between time rates of change of the generalized coordinates ...
NASA Center: Langley Research Center
Publication Year: 2007
Added to NTRS: 2008-01-11
Document ID: 20080000843
Rotor Blade Analysis Using the Mixed Finite-Element Method
Author(s): Ruzicka, Gene; Hodges, Dewey H.
Abstract: Accurate and efficient analysis of rotorcraft blades has long been a challenge. Using classic finite-element methods, it is possible to model blades of geometry, but a high price is paid for this capability in the form of ...
NASA Center: Ames Research Center
Publication Year: 2000
Added to NTRS: 2005-11-24
Document ID: 20040077155
Calculating Flow Through A Helicopter Rotor
Author(s): Kunz, Donald L.; Hodges, Dewey H.
Abstract: New method for calculating flow of air through and around helicopter rotor incorporated into General Rotorcraft Aeromechanical Stability Program (GRASP) (computer program for aeroelastic analysis). Flow about helicopter ...
NASA Center: Ames Research Center
Publication Year: 1991
Added to NTRS: 2005-09-30
Accession Number: 91B10214; Document ID: 19910000214; Report Number: ARC-12202
Optimal guidance law development for an advanced launch system
Author(s): Calise, Anthony J.; Hodges, Dewey H.; Leung, Martin S.; Bless, Robert R.
Abstract: The proposed investigation on a Matched Asymptotic Expansion (MAE) method was carried out. It was concluded that the method of MAE is not applicable to launch vehicle ascent trajectory optimization due to a lack of a ...
NASA Center: NASA (non Center Specific)
Publication Year: 1991
Added to NTRS: 2005-08-25
Accession Number: 93N20313; Document ID: 19930011124; Report Number: NAS 1.26:192189, NASA-CR-192189
Survey of Army/NASA rotorcraft aeroelastic stability research
Author(s): Ormiston, Robert A.; Warmbrodt, William G.; Hodges, Dewey H.; Peters, David A.
Abstract: Theoretical and experimental developments in the aeroelastic and aeromechanical stability of helicopters and tilt-rotor aircraft are addressed. Included are the underlying nonlinear structural mechanics of slender rotating ...
NASA Center: Ames Research Center
Publication Year: 1988
Added to NTRS: 2005-08-25
Accession Number: 89N24329; Document ID: 19890014958; Report Number: A-88266, AD-A233220, NAS 1.15:101026, NASA-TM-101026, USAAVSCOM-TR-88-A-005
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