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  • Other Sources  (3,406)
  • COMPUTER PROGRAMMING AND SOFTWARE  (2,061)
  • MECHANICAL ENGINEERING  (1,345)
  • 1990-1994  (3,406)
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  • Other Sources  (3,406)
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  • 1
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    The Consolidated Planning and Scheduling System for Space Transportation and Space Station operations - Successful development experience (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: In 1992, NASA made the decision to evolve a Consolidated Planning System (CPS) by adding the Space Transportation System (STS) requirements to the Space Station Freedom (SSF) planning software. This paper describes this evolutionary process, which began with a series of six-month design-build-test cycles, using a domain-independent architecture and a set of developmental tools known as the Advanced Scheduling Environment. It is shown that, during these tests, the CPS could be used at multiple organizational levels of planning and for integrating schedules from geographically distributed (including international) planning environments. The potential for using the CPS for other planning and scheduling tasks in the SSF program is being currently examined.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: IAF PAPER 93-408 , IAF, International Astronautical Congress; Oct 16, 1993 - Oct 22, 1993; Graz; Austria|; 7 p.
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  • 2
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    Concurrent file operations in a high performance FORTRAN (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Distributed memory multiprocessor systems can provide the computing power necessary for large scale scientific applications. A critical performance issue for a number of these applications is the efficient transfer of data to secondary storage. Recently several research groups have proposed FORTRAN language extensions for exploiting the data parallelism of such scientific codes on distributed memory architectures. However, few of these high performance FORTRAN's provide appropriate constructs for controlling the use of the parallel I/O capabilities of modern multiprocessing machines. In this paper, we propose constructs to specify I/O operations for distributed data structures in the context of Vienna Fortran. These operations can be used by the programmer to provide information which can help the compiler and runtime environment make the most efficient use of the I/O subsystem.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: Supercomputing '92; Proceedings of the Conference, Minneapolis, MN, Nov. 16-20, 1992 (A94-10682 01-62); p. 230-237.
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  • 3
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    Evolving directions in NASA's planetary rover requirements and technology (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The evolution of NASA's planning for planetary rovers (that is robotic vehicles which may be deployed on planetary bodies for exploration, science analysis, and construction) and some of the technology that was developed to achieve the desired capabilities is reviewed. The program is comprised of a variety of vehicle sizes and types in order to accommodate a range of potential user needs. This includes vehicles whose weight spans a few kilograms to several thousand kilograms; whose locomotion is implemented using wheels, tracks, and legs; and whose payloads vary from microinstruments to large scale assemblies for construction. Robotic vehicles and their associated control systems, developed in the late 1980's as part of a proposed Mars Rover Sample Return (MRSR) mission, are described. Goals suggested at the time for such a MRSR mission included navigating for one to two years across hundreds of kilometers of Martian surface; traversing a diversity of rugged, unknown terrain; collecting and analyzing a variety of samples; and bringing back selected samples to the lander for return to Earth. Current plans (considerably more modest) which have evolved both from technological 'lessons learned' in the previous period, and modified aspirations of NASA missions are presented. Some of the demonstrated capabilities of the developed machines and the technologies which made these capabilities possible are described.
    Keywords: MECHANICAL ENGINEERING
    Type: CNES, Missions, Technologies, and Design of Planetary Mobile Vehicles; p 443-454
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  • 4
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    Towards automated support for extraction of reusable components (1991)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: A cost effective introduction of software reuse techniques requires the reuse of existing software developed in many cases without aiming at reusability. This paper discusses the problems related to the analysis and reengineering of existing software in order to reuse it. We introduce a process model for component extraction and focus on the problem of analyzing and qualifying software components which are candidates for reuse. A prototype tool for supporting the extraction of reusable components is presented. One of the components of this tool aids in understanding programs and is based on the functional model of correctness. It can assist software engineers in the process of finding correct formal specifications for programs. A detailed description of this component and an example to demonstrate a possible operational scenario are given.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: ; : Strong shock waves
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  • 5
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    A parameter identification method for the rotordynamic coefficients of a high Reynolds number hydrostatic bearing (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: In identifying the rotordynamic coefficients of a high-Reynolds-number hydrostatic bearing, fluid-flow induced forces present a unique problem, in that they provide an unmeasureable and uncontrollable excitation to the bearing. An analysis method is developed that effectively eliminates the effects of fluid-flow induced excitation on the estimation of the bearing rotordynamic coefficients, by using power spectral densities. In addition to the theoretical development, the method is verified experimentally by single-frequency testing, and repeatability tests. Results obtained for a bearing are the twelve rotordynamic coefficients (stiffness, damping, and inertia coefficients) as functions of eccentricity ratio, speed, and supply pressure.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME, Transactions, Journal of Vibration and Acoustics (ISSN 0739-3717); 115; 3; p. 264-270.
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  • 6
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    Stellar Photometry Software (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: We describe the Stellar Photometry Software (SPS), which combines in a single program procedures for locating stars, computing a mean stellar point-spread function (PSF), and performing aperture and/or multiple PSF-fitting photometry, along with related bookkeeping functions. The software can be run either interactively or in batch mode on computers using the UNIX operating system. The performance of SPS is compared to that of the photometry programs DoPHOT and IRAF/DAOPHOT, using both real and simulated CCD observations. A direct comparison of the instrumental magnitudes shows that all three programs produce comparable results.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 105; 687; p. 527-537.
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  • 7
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    A microcomputer program for estimating low altitude wind and turbulence fields (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Past efforts to develop methods for objective wind analysis and to provide turbulence estimates to pilots are reviewed. The present approach involves a wind module and a turbulence module. The wind module extends the critical dividing streamline concept and past developments in mass-conserving wind interpolation schemes. The turbulence module is based on recent efforts to develop practical atmospheric turbulence parameterization schemes based on lapse rate, wind shear, surface heating, and surface roughness. The lapse rate and wind shear are readily obtained from the wind module. Surface roughness and heating come from land use information and net radiation estimates derived from cloud cover, terrain slope, local time, and latitude. This system is argued to have considerable potential for providing useful online information for many kinds of aircraft operations.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: In: International Conference on Aviation Weather Systems, 4th, Paris, France, June 24-28, 1991, Preprints (A93-22101 07-47); p. 295-300.
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  • 8
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    Design sensitivity analysis and optimization tool (DSO) for sizing design applications (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The DSO tool, a structural design software system that provides the designer with a graphics-based menu-driven design environment to perform easy design optimization for general applications, is presented. Three design stages, preprocessing, design sensitivity analysis, and postprocessing, are implemented in the DSO to allow the designer to carry out the design process systematically. A framework, including data base, user interface, foundation class, and remote module, has been designed and implemented to facilitate software development for the DSO. A number of dedicated commercial software/packages have been integrated in the DSO to support the design procedures. Instead of parameterizing an FEM, design parameters are defined on a geometric model associated with physical quantities, and the continuum design sensitivity analysis theory is implemented to compute design sensitivity coefficients using postprocessing data from the analysis codes. A tracked vehicle road wheel is given as a sizing design application to demonstrate the DSO's easy and convenient design optimization process.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 92-4798 , In: AIAA(USAF)NASA/OAI Symposium on Multidisciplinary Analysis and Optimization, 4th, Cleveland, OH, Sept. 21-23, 1992, Technical Papers. Pt. 2 (A93-20301 06-66); p. 867-877.
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  • 9
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    Gripper for truss structure assembly (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The CIRSSE two-finger gripper is designed to be used with a 6-axis wrist-mounted force-torque sensor as part of an experimental testbed for cooperative robotic manipulation. The gripper system consists of a dedicated controller and a pneumatic powered gripper that is servoed in position or grasping force. The gripper also has a between fingertip light beam sensor. The major features of this new design are: high grasping force to weight ratio (25::1) and compactness (14 cm base-fingertip, 0.8 kilograms); low cost dedicated slave controller; and simple host-controller communications protocol to minimize command interpretation delay. Shared software functions between the host and the controller processor permit the host to select servo mode, servo gain-parameter values, and calibration offsets. Hidden primitive self-test, calibration and servo confidence functions are included.
    Keywords: MECHANICAL ENGINEERING
    Type: Cooperative Intelligent Robotics in Space; Nov 06, 1990 - Nov 07, 1990; Boston, MA; United States
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  • 10
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    Seamless transitions from early prototypes to mature operational software - A technology that enables the process for planning and scheduling applications (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: New and innovative software technology is presented that provides a cost effective bridge for smoothly transitioning prototype software, in the field of planning and scheduling, into an operational environment. Specifically, this technology mixes the flexibility and human design efficiency of dynamic data typing with the rigor and run-time efficiencies of static data typing. This new technology provides a very valuable tool for conducting the extensive, up-front system prototyping that leads to specifying the correct system and producing a reliable, efficient version that will be operationally effective and will be accepted by the intended users.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: IAF PAPER 92-0544
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