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  • FLUID MECHANICS AND HEAT TRANSFER  (4)
  • Assembly-like queues  (2)
  • Composite Materials  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Estimating the throughput of an exponential CONWIP assembly system (1993)
    Springer
    Queueing systems 14 (1993), S. 135-157 
    Details
    ISSN: 1572-9443
    Keywords: Assembly-like queues ; approximations ; throughput, design issues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We consider a production system consisting of several fabrication lines feeding an assembly station where both fabrication and assembly lines consist of multiple machine exponential workstations and the CONWIP (CONstant Work-In-Process) mechanism is used to regulate work releases. We model this system as an assembly-like queue and develop approximations for the throughput and average number of jobs in queue. These approximations use an estimate of the time that jobs from each line spend waiting for jobs from other lines before being assembled. We use our approximations to gain insight into the related problems of capacity allocation, bottleneck placement and WIP setting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153531
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Bounds and heuristics for assembly-like queues (1989)
    Springer
    Queueing systems 4 (1989), S. 137-155 
    Details
    ISSN: 1572-9443
    Keywords: Assembly-like queues ; bounds ; approximations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We consider an assembly system with exponential service times, and derive bounds for its average throughput and inventories. We also present an easily computed approximation for the throughput, and compare it to an existing approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01158549
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Influence of velocity gradients on measurements of velocity and streamwise vorticity with hot-wire X-array probes (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analysis and measurement of the effects of the streamwise velocity gradients partial derivative of U with respect to y and partial derivative of U with respect to z, on the velocity components, U, v, and w, and the streamwise vorticity component, omega sub x measured in turbulent flow with a pair of orthogonal hot-wire X arrays, is presented. It is shown that these gradients, which can have the same order of magnitude instantaneously as the mean shear stress at the wall, cause extremely large errors in the measured instantaneous cross-stream velocity and streamwise vorticity components.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Review of Scientific Instruments; 52; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Mean streamwise spacing of organized structures in transitional and developed bounded turbulent flows (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The mean periods of passage of organized structures detected by a wide variety of criteria in all regions of turbulent boundary layers, pipes, and channel flows over a range of two Reynolds number decades are compared to that of the transition 'spike'. When scaled with the local mean velocities and the shear layer thicknesses to form a nondimensional streamwise spacing, they fall within a fairly narrow range of TU/delta = 1.5-3.5. The streamwise spacing shows little variation across most of the shear layer for any particular data set.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA Journal (ISSN 0001-1452); 22; 766-769
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Measurement of the structure of the streamwise vorticity field in a turbulent boundary-layer (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A survey of measurements of vorticity in bounded turbulent shear flows is presented. It is shown that the measured rms streamwise vorticity is systematically too large by as much as 45% when measured with a four-sensor Kovasznay-type array. Instantaneous values can be much more in error. Therefore this probe should not be used to detect instantaneous vortical structures. New attempts to measure vorticity are described.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Effect of Mechanical Discontinuities on the Strength of Polycrystalline Aluminum Oxide M.S. Thesis (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-14
    Description: No abstract available
    Keywords: Composite Materials
    Type: LBL-8066
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Observations on the nature and mechanism of the bounded turbulent shear flow structure (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A physical model of the bounded turbulent shear flow structure based on the viscous diffusion of vortex lines at the wall and their stretching by the strain rate field is presented. Evidence from the literature supporting the model is briefly reviewed, and new flow visualization evidence is presented. Progress toward quantifying the structure's characteristics with a multi-sensor hot-wire vorticity probe is described.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Turbulence and chaotic phenomena in fluids; Sep 05, 1983 - Sep 10, 1983; Kyoto; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Measurement of Spatial Filtering Capabilities of Single Mode Infrared Fibers (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Spatial filtering is necessary to achieve deep nulls in optical interferometer and single mode infrared fibers can serve as spatial filters. The filtering function is based on the ability of these devices to perform the mode-cleaning function: only the component of the input field that is coupled to the single bound (fundamental) mode of the device propagates to the output without substantial loss. In practical fiber devices, there are leakage channels that cause light not coupled into the fundamental mode to propagate to the output. These include propagation through the fiber cladding and by means of a leaky mode. We propose a technique for measuring the magnitude of this leakage and apply it to infrared fibers made at the Naval Research Laboratory and at Tel Aviv University.
    Keywords: Composite Materials
    Type: SPIE Conference on Astronomical Telescopes and Instrumentation 2006; May 21, 2006 - May 31, 2006; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
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