SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Weighting factors combined with individual value functions for 350 candidate orbits for Voyager Mars missions to develop computer-determined overall value functions for optimum orbits
Voyager capsule surface laboratory system - mission analysis, system functional requirements, and design selection and alternatives
Existence and uniqueness theorem of Riccati equation arising in solution of optimal linear regulator problems in Hilbert space
Nonlinear programming in Banach space, considering saddle value problem
Machine independent axiomatic theory of complexity of recursive functions
Theory of nonself-adjoint ordinary second order differential operators, discussing solution algorithms
Extent of system parameter change insuring system performance within specified limit
Monotone iterations for nonlinear elliptic differential equations in boundary-value problems applied to Gauss-Seidel methods
Optimal control of dynamic systems with minimax type performance index, discussing application of proposed method of solution
Time optimal control for parabolic equations, proving bang-bang principle, smoothness, existence of minimum, etc
Mathematical model for deriving pressure drop against flow function of counterflow boiler tube in Rankine space power system
Feasibility and reliability analysis in use of pilots to guide and control launch vehicles of Saturn 5 class
Analysis of functional requirements for data management systems used with space shuttle - Vol. 1
The large disk systems offered by IBM, UNIVAC, Digital Equipment Corporation, and Data General were examined. In particular, these disk systems were analyzed in terms of how well available operating systems take advantage of the respective disk controller's transfer rates, and to what degree all available data for optimizing disk usage is effectively employed. In the course of this analysis, generic functions and components of disk systems were defined and the capabilities of the surveyed disk system were investigated.
Progress in the development of system models and techniques for the formulation and evaluation of aircraft computer system effectiveness is reported. Topics covered include: analysis of functional dependence: a prototype software package, METAPHOR, developed to aid the evaluation of performability; and a comprehensive performability modeling and evaluation exercise involving the SIFT computer.
The functional, performance, design, and test requirements for the Orbiter power extension package and its associated ground support equipment are defined. Both government and nongovernment standards and specifications are cited for the following subsystems: electrical power, structural/mechanical, avionics, and thermal control. Quality control assurance provisions and preparation for delivery are also discussed.
Tooling concepts were developed which would permit co-couring of the hat stiffeners to the skin to form the cover assembly in a single autoclave cycle. These tooling concepts include the use of solid rubber mandrels, foam mandrels, and formed elastometric bladders. A simplification of the root end design of the cover hat stiffeners was accomplished in order to facilitate fabrication. The conversion of the 3D NASTRAN model from level 15 to level 16 was completed and a successful check run accomplished. A detailed analysis of the thermal load requirement for the environmental chambers was carried out. Based on the thermal analysis, best function requirements, load inputs and ease of access, a system involving four chambers, two for the covers containing 6 and 4 specimens, respectively, and two for the spares containing 6 and 4 specimens, respectively, evolved.
Several FORTRAN program modules for performing one-dimensional and two-dimensional discrete Fourier transforms, Mellin, and Fourier-Bessel transforms are described along with programs that realize the algebra of high speed Fourier transforms on a computer. The programs can perform numerical harmonic analysis of functions, synthesize complex optical filters on a computer, and model holographic image processing methods.