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in subjects: "Analog Systems"

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Sandia Laboratories hybrid computer and motion simulator facilities

Hybrid computer and motion simulator facilities at Sandia National Laboratories include an AD/FIVE-AD10-PDP11/60, an AD/FIVE-PDP11/45, an EAI7800-EAI640, an EAI580/TR48-Nova 800, and two Carco S-45OR-3/R-493A three-axis motion simulators. An EAI680 is used in the analog mode only. This report describes the current equipment.

Date: May 1, 1980

Creator: Curry, W. H. & French, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Six phase rectifier digital computer simulation

A digital computer program has been developed for the simulation of a six-pulse converter with a resistance-inductance load. The program calculates the time histories of the voltages and currents on both the ac and dc sides of the rectifier bridges. The grid delay angle is calculated in terms of the load current, supply voltage, and commutating reactance. The program is written in FORTRAN and is executable on the CDC7600 Plotted output of ten variables can be requested. This program is a prelim… more

Date: October 1, 1975

Creator: Miller, R. W. & Nichols, J. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Vacuum system transient simulator and its application to TFTR

The vacuum system transient simulator (VSTS) models transient gas transport throughout complex networks of ducts, valves, traps, vacuum pumps, and other related vacuum system components. VSTS is capable of treating gas models of up to 10 species, for all flow regimes from pure molecular to continuum. Viscous interactions between species are considered as well as non-uniform temperature of a system. Although this program was specifically developed for use on the Tokamak Fusion Test Reactor (TFTR… more

Date: January 1, 1977

Creator: Sredniawski, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nuclear power plant simulation facility evaluation methodology

A methodology for evaluation of nuclear power plant simulation facilities with regard to their acceptability for use in the US Nuclear Regulatory Commission (NRC) operator licensing exam is described. The evaluation is based primarily on simulator fidelity, but incorporates some aspects of direct operator/trainee performance measurement. The panel presentation and paper discuss data requirements, data collection, data analysis and criteria for conclusions regarding the fidelity evaluation, and … more

Date: January 1, 1985

Creator: Haas, P.M.; Carter, R.J. & Laughery, K.R. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Mechanism Explaining the Instability of EBR-I, Mark III

Presented at the International Atomic Energy Agencysponsored Seminar on the Physics of Fast and Intermediate Reactors. Vienna, August 3-11, 196l. A feedback model, was developed to account for resonant instabilities in the Mark II core. In this model, the prompt positive power coefficient effect is ascribed to fuel rod bowing and the delayed negative power coefficient effect to thermally lnduced motions in the lower shield plate. Since this model is supported by observations, it is concluded th… more

Date: September 1, 1961

Creator: Smith, R. R.; Matlock, R. G.; McGinnis, F. D.; Novick, M. & Thalgott, F. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Four-wheel-drive powertrain models for real-time simulation

Dynamic vehicle powertrain models have been formulated by many researchers for particular applications, mainly the analysis of powertrain characteristics or vibration. In this paper, we formulate models of four-wheel-drive vehicle powertrains for the purpose of real-time simulation. While not encompassing the complete characteristics of powertrain operation, these models are applicable for use in vehicle simulators, and include both the differential and lock-up modes of four-wheel-drive transfe… more

Date: January 1, 1991

Creator: Freeman, J.S. (Los Alamos National Lab., NM (United States)) & Velinsky, S.A. (California Univ., Davis, CA (United States). Dept. of Mechanical Engineering)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigations of entrainment mortality among larval and juvenile fishes using a Power Plant Simulator

A Power Plant Simulator (PPS) was constructed at the Oak Ridge National Laboratory to examine the component sources of entrainment mortality. This experimental apparatus circulates temperature-controlled water through a closed loop consisting of a pump, a condenser bundle, and vertically adjustable piping. Larval bluegill, channel catfish, carp, largemouth bass, and smallmouth bass and juvenile bluegill and mosquitofish were exposed to different combinations of pump speed and water temperatures… more

Date: January 1, 1980

Creator: Cada, G. F.; Suffern, J. S.; Kumar, K. D. & Solomon, J. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analytical modeling techniques for efficient heat transfer simulation in nuclear power plant transients

New integral methods are formulated which are suitable for efficient computer simulation of thermal conduction and convective heat transfer in large engineering systems such as nuclear power plants. The methods described here have been shown to produce, in a special-purpose minicomputer for complex system simulations, extremely high simulation speed and accuracy which is commensurate with that of instrumentation. 11 refs., 3 figs.

Date: January 1, 1985

Creator: Wulff, W.; Cheng, H.S. & Mallen, A.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Reservoir performance in viscoelastic porous media

The mass balance equations for a two-phase two-component fluid system are written for viscoelastic porous media. The resulting equations are approximated by finite differences and the resulting numerical simulator is used to conduct a sensitivity study on the effects of uniaxial viscoelastic deformation in geopressured aquifers. Results of this study indicate that viscoelastic deformation may have considerable influence on the pressure maintenance of these aquifers. A numerical model of the geo… more

Date: January 1, 1982

Creator: Rago, F. M.; Ohkuma, H.; Sepehrnoori, K. & Thompson, T.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Programmable data acquisition system for microwave calibration

A fully automated, programmable data acquisition system has been developed to record by printout or on punched paper tape the data for microwave power calibration. The system programs, controls, and receives BCD, analog, and ASCII information from external instrumentation. Construction, requirements, and operation of the system are described, and wiring diagrams are included.

Date: January 1, 1978

Creator: Cable, J.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear power plant training simulator fidelity assessment

The fidelity assessment portion of a methodology for evaluating nuclear power plant simulation facilities in regard to their appropriateness for conducting the Nuclear Regulatory Commission's operating test was described. The need for fidelity assessment, data sources, and fidelity data to be collected are addressed. Fidelity data recording, collection, and analysis are discussed. The processes for drawing conclusions from the fidelity assessment and evaluating the adequacy of the simulator con… more

Date: January 1, 1985

Creator: Carter, R.J. & Laughery, K.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analog signal recorder

No Description Available.

Date: October 1, 1975

Creator: Sand, R. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High-speed BWR power plant simulations on the special-purpose peripheral processor AD10

A newly developed technique is described for fast, on-line simulations of normal and accidental transients in nuclear power plants. The technique is based on the utilization of the special-purpose peripheral processor ADlO, which is specifically designed for high-speed systems simulations through integration of large systems of nonlinear ordinary differential equations. The Peach Bottom-II Boiling Water Reactor power plant has been simulated and results are presented. It is shown that the new t… more

Date: January 1, 1984

Creator: Wulff, W.; Cheng, H.S.; Lekach, S.V. & Mallen, A.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Programs for control of an analog-signal switching network

A suite of programs has been developed to control the network of analog-signal switching multiplexers in the AGS complex. The software is driven by a relational database which describes the architecture of the multiplexer tree and the set of available analog signals. Signals are routed through a three-layer multiplexer tree, to be made available at four consoles each with three 4-trace oscilloscopes. A menu-structured operator interface program is available at each console, to accept requests t… more

Date: January 1, 1989

Creator: D'Ottavio, T.; Enriquez, R.; Katz, R. & Skelly, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Modeling requirements for full-scope reactor simulators of fission-product transport during severe accidents

This paper describes in the needs and requirements to properly and efficiently model fission product transport on full scope reactor simulators. Current LWR simulators can be easily adapted to model severe accident phenomena and the transport of radionuclides. Once adapted these simulators can be used as a training tool during operator training exercises for training on severe accident guidelines, for training on containment venting procedures, or as training tool during site wide emergency tra… more

Date: January 1, 1990

Creator: Ellison, P.G.; Monson, P.R. (Westinghouse Savannah River Co., Aiken, SC (United States)) & Mitchell, H.A. (Concord Associates, Inc., Knoxville, TN (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Mathematical methodology for evaluating simulations of flow in porous media. Final report, February 1, 1980-August 31, 1983

This report concerns development of a methodology for evaluation of reservoir simulators. Although validity and usefulness of reservoir simulations might be questioned on various grounds, this study involves tests of resolution of numerical computational difficulties and of compatibility of correlations used in representation of fluid properties and phase flow interference. A similarity concept is used which allows testing of simulators to be based on solution of a system of ordinary differenti… more

Date: January 1, 1984

Creator: Ford, W.T. & Anderson, R.M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Design and performance of an 11 kW Solar Array Simulator

A Solar Array Simulator combines a high efficiency switching regulator, a high performance series regulator, and a low power analog adjustable I-V generator to duplicate the static and dynamic characteristics of photovoltaic cells operated in series-parallel combinations. Both voltage and current feedback are used to control the switching and series regulators. Stability of the series regulator over a wide range of load time constants is achieved by a compensation technique. Current-voltage and… more

Date: January 1, 1980

Creator: Smith, D. R.; O'Sullivan, G. A. & O'Sullivan, F. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analytical modeling of line focus solar collectors

Solar thermal electric power generation systems and industrial process heat systems generating steam through flash vaporization require a constant outlet temperature from the collector field. This constant temperature is most efficiently maintained by adjusting the circulating fluid flow rate. Successful design of analog controllers for this regulation requires knowledge of system dynamics and the nonlinear nature of the system parameters. Simplified models relating deviations in outlet tempera… more

Date: April 1, 1980

Creator: Wright, J. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Precision cryogenic temperature data acquisition system

A Multiplexed Temperature Data Acquisition System with an overall precision of +-25 ppM has been designed using state-of-the-art electronics to accurately read temperature between 2.4 K and 600 K from pre-calibrated transducers such as germanium, silicon diode, thermistor or platinum temperature sensors.

Date: January 1, 1985

Creator: Farah, Y. & Sondericker, J.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SASSYS-1 balance-of-plant component models for an integrated plant response

Models of power plant heat transfer components and rotating machinery have been added to the balance-of-plant model in the SASSYS-1 liquid metal reactor systems analysis code. This work is part of a continuing effort in plant network simulation based on the general mathematical models developed. The models described in this paper extend the scope of the balance-of-plant model to handle non-adiabatic conditions along flow paths. While the mass and momentum equations remain the same, the energy e… more

Date: January 1, 1989

Creator: Ku, J.-Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Compressor performance at high suction temperatures with application to solar heat pump

As part of the study of Solar Assisted Heat Pump (SAHP) Systems, the performance of the heat pump itself and its components under conditions attendant to series solar input to the evaporator is being investigated at Brookhaven National Laboratory (BNL). Particular emphasis has been placed on the details of the compressor performance, since in order to properly exploit the thermodynamic potential of high solar input temperatures (40 to 100/sup 0/F), the compressor must operate efficiently over a… more

Date: January 1, 1980

Creator: Kush, E A

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Using computer graphics to analyze the placement of neutral-beam injectors for the Mirror Fusion Test Facility

To optimize the neutral-beam current incident on the fusion plasma and limit the heat load on exposed surfaces of the Mirror Fusion Test Facility magnet coils, impingement of the neutral beams on the magnet structure must be minimized. Also, placement of the neutral-beam injectors must comply with specifications for neutral-current heating of the plasma and should allow maximum flexibility to accommodate alternative beam aiming patterns without significant hardware replacement or experiment dow… more

Date: September 23, 1977

Creator: Horvath, J. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Assessment of the need for and feasibility of establishing a national reactor engineering simulator facility

A study was conducted by the Department of Energy's Office of Nuclear Power Systems to determine the need for and feasibility of establishing a reactor engineering simulator facility at a National Laboratory. Input was obtained from a wide cross section of the Nation's nuclear industry, the Department's National Laboratories, the Nuclear Regulatory Commission (NRC), and the Advisory Committee on Reactor Safeguards in carrying out this study. Based on this input, the Department concludes that th… more

Date: December 1, 1981

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

SCDAP/RELAP5/MOD2 Code Manual

The SCDAP/RELAP5 code has been developed for best-estimate transient simulation of light water reactor coolant systems during a severe accident. The code models the coupled behavior of the reactor coolant system, the core, and the fission products and aerosols in the system during a severe accident transient as well as large and small break loss-of-coolant accidents, operational transients such as anticipated transient without SCRAM, loss of offsite power, loss of feedwater, and loss of flow. A… more

Date: September 1, 1989

Creator: Allison, C. M.; Johnson, E .C.; Berna, G. A.; Cheng, T. C.; Hagrman, D. L.; Johnsen, G. W. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department