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  • 1
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    THREE-DIMENSIONAL LOW-THRUST INTERPLANETARY TRAJECTORY OPTIMIZATION (1962)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Low thrust propulsion interplanetary trajectory flight optimization - guidance systems
    Keywords: SPACE RADIATION
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    NASA TECHNICAL REPORTS
  • 2
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    On the solution of problems involving impact type loading (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The response of beam and plate members to pulse and impact loading is investigated, and numerical methods are analyzed and compared. The equations of motion, the finite difference and finite element methods, the time integration/Runge-Kutta techniques, and material modeling are discussed in detail. It is found that both the finite difference and the finite element methods could be accurately employed to discretize the spatial variation in the displacements. Central differences or a fourth order Runge-Kutta algorithm could be used for the time integration. The total energy of the system would give the stability and accuracy of the solution. Results showed that the finite element method provided better efficiency in obtaining accurate solution than the finite difference method when a scalar processor is used. However, the finite difference method was more efficient on the vector processor. Therefore, the most efficient method of solution depends on the type of computer present for the analysis.
    Keywords: STRUCTURAL MECHANICS
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  • 3
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    A trajectory optimization technique based upon the theory of the second variation. (1964)
    In:  Other Sources
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    Publication Date: 2019-05-22
    Description: Optimization of trajectory achieved by successive approximation method based on second variation theory
    Keywords: SPACE RADIATION
    Type: AIAA PAPER 63-415
    Format: text
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  • 4
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    Several trajectory optimization techniques. ii - application. (1964)
    In:  Other Sources
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    Publication Date: 2019-05-22
    Description: Steepest descent, second variation and generalized newton-raphson trajectory optimization techniques applied to minimum time, low thrust, circle-to- circle transfer problems
    Keywords: SPACE RADIATION
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  • 5
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    A TRAJECTORY OPTIMIZATION TECHNIQUE BASED UPON THE THEORY OF THE SECOND VARIATION (1963)
    In:  Other Sources
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    Publication Date: 2019-05-10
    Description: Optimization of a trajectory is achieved by a successive approximation method based on the second variation theory
    Keywords: SPACE RADIATION
    Type: AIAA PAPER 63-415
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  • 6
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    A TRAJECTORY OPTIMIZATION TECHNIQUE BASED UPON THE THEORY OF THE SECOND VARIATION (1963)
    In:  Other Sources
    Details
    Publication Date: 2019-05-11
    Description: Trajectory optimization technique based on theory of second variation
    Keywords: SPACE RADIATION
    Type: AIAA PAPER-63-415
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  • 7
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    Optimal multistage rocket flight and other discontinuous variational problems (1963)
    In:  CASI
    Details
    Publication Date: 2019-05-21
    Description: Discontinuous variational problems & optimal flight of multistage rockets
    Keywords: SPACE RADIATION
    Type: RN-162
    Format: text
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  • 8
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    Response of composite plates subjected to acoustic loading (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objectives of the project were to investigate numerical methodology for the determination of narrowband response in the geometrically nonlinear regime, to determine response characteristics for geometrically nonlinear plates subjected to random loading and to compare the predictions with experiments to be performed at NASA-Langley. The first two objectives were met. The response of composite plates subjected to both narrowband and broadband excitation were studied and the results are presented and discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-184618 , NAS 1.26:184618
    Format: application/pdf
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  • 9
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    Biaxial load effects in the mechanics of fracture (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Experimental findings on the effects of biaxial loading on fracture toughness, non-self-similar growth problems, fatigue crack propagation, and subcritical growth properties are reviewed, together with the fundamental analytical solutions for problems of crack in an elastic solid under biaxial loading. Basic asymptotic field representations, and some stress-intensity factor solutions are presented. The effects of biaxial loading on problems involving plastic deformation are illustrated with recent numerical results. Early asymptotic solutions for a nonlinear elastic solid are discussed with emphasis on the solution of problems with significant plastic deformation, and on stable crack growth. A brief survey of the applications literature, and recommendations for future studies are included.
    Keywords: STRUCTURAL MECHANICS
    Type: Aeronautical Society of India, Journal (ISSN 0001-9267); 36; 221-236
    Format: text
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  • 10
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    Vibration response of geometrically nonlinear elastic beams subjected to pulse and impact loading (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An understanding of the response of composite laminates to foreign object impact is of fundamental importance to the design and the accurate evaluation of aircraft and aerospace structures. A characterization of the basic deformation response of the system is needed for the accurate and consistent modeling of the damage caused by the impact. The response to low velocity impact of foreign objects (less than 10 m/sec at 10 J of impact energy or less) is of particular interest because it corresponds to tool drop problems. An investigation of the vibration response of a simple square beam was conducted, taking into account both sharp initial velocity pulse conditions and simulated impact conditions. Attention is given to nonlinear beam theory, boundary conditions and materials modeling, initial conditions and impact modeling, and a solution of the obtained system of partial differential equations by the finite difference approach.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 20; 4 19
    Format: text
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