Free-fall periodic orbits connecting Earth and Mars
Free fall periodic orbits connecting Earth and Mars
Rall, C. S.↗
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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.
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Thermal conductive connection and method of making same Patent
Thermal conductive, electrically insulated cleavable adhesive connection between electronic module and heat sink
Harper, C. A.↗
Printed circuit board with bellows rivet connection Patent
Electrical connection for printed circuits on common board, using bellows principle in rivet
Gould, C. W.↗
Switching circuit employing regeneratively connected complementary transistors Patent
Switching circuit with regeneratively connected transistors eliminating power consumption when not in use
Shortridge, S. R.↗
Development of an advanced microelectronic connection welding system Final report
Development of microelectronic connection welding system using infrared feedback control
Braswell, R. R.↗
Sealed separable connection Patent
Sealed separable connection for thin wall metal tube
Bamford, R. M.↗
Protection of serially connected solar cells against open circuits by the use of shunting diode Patent
Maintaining current flow through solar cells with open connection using shunting diode
Shattuck, R. D.↗
Connectivity and genus in three dimensions
Algorithms for labeling, counting, and computing connected objects in binary three dimensional array
Park, C. M.↗
HETRAN: A computer program to solve the two-dimensional steady-state heat conduction on a cladded tube with a connecting fin
Computer program HETRAN to solve two dimensional steady state heat conduction on cladded tube with connecting fin
Molls, F. B.↗
Development, fabrication and testing of a magnetically connected plastic vacuum probe surface sampler
The sampler utilizes permanent magnets and soft metal pole pieces to connect the cone/filter assembly to the sampling head and vacuum supply. The cone/filter assembly is packaged in a plastic container and presterilized so that the need for any human contact during the sampling procedure is completely eliminated. Microbiological tests have demonstrated that the sampling efficiency is not affected by the magnetic coupling apparatus and that the probe appears to function as efficiently as the conventional plastic and Sandia vacuum probes.
Phillips, G. B.↗
Dynamics of a spinning space station with a counterweight connected by multiple cables.
A unique and relatively simple approach is presented for obtaining the linearized equations of motion. A conservative system consisting of two rigid bodies connected by any number of massless cables with linear axial stiffness is assumed. The cable forces and torques are expanded in a Taylor series about the equilibrium values of the system coordinates which results in a cable stiffness matrix. The method of obtaining the equilibrium values of the coordinates is discussed and results are presented. The range of validity of the linear model is determined by comparing results with a digital simulation of the nonlinear system.
Nixon, D. D.↗
Cable Connected Spinning Spacecraft, 1. the Canonical Equations, 2. Urban Mass Transportation, 3
Work on the dynamics of cable-connected spinning spacecraft was completed by formulating the equations of motion by both the canonical equations and Lagrange's equations and programming them for numerical solution on a digital computer. These energy-based formulations will permit future addition of the effect of cable mass. Comparative runs indicate that the canonical formulation requires less computer time. Available literature on urban mass transportation was surveyed. Areas of the private rapid transit concept of urban transportation are also studied.
Sitchin, A.↗
Optimum allocation of redundancy among subsystems connected in series
This analysis considers the optimum allocation of redundancy in a system of serially connected subsystems in which each subsystem is of the k-out-of-n type. Redundancy is optimally allocated when: (1) reliability is maximized for given costs; or (2) costs are minimized for given reliability. Several techniques are presented for achieving optimum allocation and their relative merits are discussed. Approximate solutions in closed form were attainable only for the special case of series-parallel systems and the efficacy of these approximations is discussed.
Bien, D. D.↗
Dynamic analysis of a system of hinge-connected rigid bodies with nonrigid appendages
Equations of motion are derived for use in simulating a spacecraft or other complex electromechanical system amenable to idealization as a set of hinge-connected rigid bodies of tree topology, with rigid axisymmetric rotors and nonrigid appendages attached to each rigid body in the set. In conjunction with a previously published report on finite-element appendage vibration equations, this report provides a complete minimum-dimension formulation suitable for generic programming for digital computer numerical integration.
Likins, P. W.↗
Attitude dynamics simulation subroutines for systems of hinge-connected rigid bodies
Several computer subroutines are designed to provide the solution to minimum-dimension sets of discrete-coordinate equations of motion for systems consisting of an arbitrary number of hinge-connected rigid bodies assembled in a tree topology. In particular, these routines may be applied to: (1) the case of completely unrestricted hinge rotations, (2) the totally linearized case (all system rotations are small), and (3) the mixed, or partially linearized, case. The use of the programs in each case is demonstrated using a five-body spacecraft and attitude control system configuration. The ability of the subroutines to accommodate prescribed motions of system bodies is also demonstrated. Complete listings and user instructions are included for these routines (written in FORTRAN V) which are intended as multi- and general-purpose tools in the simulation of spacecraft and other complex electromechanical systems.
Fleischer, G. E.↗
Dynamic analysis of a system of hinge-connected rigid bodies with nonrigid appendages
Equations of motion are derived for use in simulating a spacecraft or other complex electromechanical system amenable to idealization as a set of hinge-connected rigid bodies of tree topology, with rigid axisymmetric rotors and nonrigid appendages attached to each rigid body in the set. In conjunction with a previously published companion paper on finite-element appendage vibration equations, this paper provides a complete minimum-dimension formulation suitable for generic programming for digital computer numerical integration.
Likins, P. W.↗
Connective stability of nonlinear matrix systems
Consideration of stability under structural perturbations of free dynamic systems described by the differential equation dx/dt = A(t,x)x, where the matrix A(t,x) has time-varying nonlinear elements. The concept of 'connective stability' is introduced to study the structural properties of competitive-cooperative nonlinear matrix systems. It is shown that stability reliability in such systems is high and that they remain stable despite time-varying (including 'on-off') interaction among individual agents present in the system. The results obtained can be used to study stability aspects of mathematical models arising in as diverse fields as economics, biology, arms races, and transistor circuits.
Siljak, D. D.↗
Instabilities connected with neutral sheets in the solar wind
A preliminary study is presented of two sets of data obtained by HEOS 1 and OGO 5 in the solar wind, which reveal the internal structure of two neutral sheets and their two-dimensional structure. HEOS 1 observations of the effects of the tearing mode instability in one of the sheets are described, including complicated structures connected with the sector boundary, sharp increases and decreases in the magnetic field intensity, and the presence of closed loops. HEOS 1 and OGO 5 observations of large oscillations due to plasma pressure imbalances are discussed, and it is concluded that an interchange instability may have been observed.
Formisano, V.↗