208
208
Jun 17, 2010
06/10
by
Kotnik, J. T.; Sater, B. L
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No Abstract Available
Topics: ELECTRIC PROPULSION, POWER CONDITIONING, SPACE ELECTRIC ROCKET TESTS
Increasing energy needs push industry to build more sustainable and efficient systems. One of the methods to achieve energy efficiency is to feed wasted energy generated by a system itself during operation back to the system. Vibrational energy is one of the most common ambient energy forms in mechanical systems and can be converted into electrical energy with the implementation of piezoelectric energy harvesters. What makes this possible is the piezoelectric effect that some crystals and...
Topics: MEMS, Waste Energy Harvesting, Piezoelectric, Power Conditioning, Piezoelectric Energy Harvester
This paper describes modeling of bi-directional grid-connected inverter for micro-grid applications at steady state and also studies the transient responses for various loading conditions. In this paper mainly the power conditioning unit for micro grid which consists of DC to AC grid connected inverter has been developed. In Inverter simulat ion model, a 50KW source is connected to the load as well as utility grid. In this simulation model, the power response of load and utility grid is...
Topics: Micro Grid, Power Conditioning Unit, Bi- Directional Grid Connected Inverter
239
239
Jul 11, 2010
07/10
by
QUEMARD, C.; MIGNOSI, A.; SERAUDIE, A
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THE PROBLEM OF STARTING AN INDUCTION WIND TUNNEL WITH RETURN CIRCUIT IS DISCUSSED. THE BASIC EQUATIONS GOVERNING START-UP ARE GIVEN, AND THE PRINCIPAL EXPERIMENTS CONDUCTED WITH THE T PRIME SUB 2 WIND TUNNEL WITH PERIPHERAL INJECTION ARE SHOWN. FINALLY THE RESULTS OF EXPERIMENTS ABD OF THE COMPUTATION ARE DISCUSSED AND A COMPARISON OF EXPERIMENT AND COMPUTATION IS MADE.
Topics: LIE GROUPS, POWER CONDITIONING, CONTROL THEORY, MATHEMATICAL MODELS, NETWORK SYNTHESIS
Air Force bases, having been constructed many years ago, employ old, inefficient power distribution systems. In order to comply with the Energy Policy Act of 1992, the Air Force must reduce energy consumption. One way of doing this is to install more efficient power distribution equipment, which will cut energy losses during distribution. The first purpose of this paper is to find off-the-shelf power distribution equipment that can be implemented to increase the efficiency.
Topics: DTIC Archive, ALFRED UNIV NY, *ELECTRIC POWER DISTRIBUTION, EFFICIENCY, ENERGY CONSUMPTION, POWER...
250
250
Jun 12, 2011
06/11
by
Hollinger, Geoffrey A.; Briscoe, Jeri M
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Using the DarwinZk development software, a genetic algorithm (GA) was used to design and optimize a pipe-crawling robot for parameters such as mass, power consumption, and joint extension to further the research of the Miniature Inspection Systems Technology (MIST) team. In an attempt to improve on existing designs, a new robot was developed, the piezo robot. The final proposed design uses piezoelectric expansion actuators to move the robot with a 'chimneying' method employed by mountain...
Topics: ION PROPULSION, ROCKET ENGINES, POWER CONDITIONING, WEIGHT REDUCTION, BREADBOARD MODELS, SOLAR...
The NIF Power Conditioning System provides the pulsed excitation required to drive flashlamps in the laser s optical amplifiers. Modular in design, each of the 192 Main Energy Storage Modules (MESMs) storage up to 2.2 MJ of electrical energy in its capacitor bank before delivering the energy to 20 pairs of flashlamps in a 400 s pulse (10% power points). The peak current of each MESM discharge is 0.5 MA. Production, installation, commissioning and operation of the NIF Power Conditioning continue...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *POWER CONDITIONING, ENERGY STORAGE, FLASH LAMPS,...
This report covers effort to develop a microprocessor-based controller for the Delco 15 KW power conditioner. Continuing from the microprocessor selection, the previous task, the controller hardware was developed and tested during this task. The controller software will be developed in the next task. The controller hardware conforms closely to the controller baseline design concepts of Task 2. A variation from the baseline did occur in the converter SCR commutation sense circuitry. The existing...
Topics: DTIC Archive, YUCCA INTERNATIONAL INC SCOTTSCALE AZ, *MICROPROCESSORS, *POWER CONDITIONING,...
4,914
4.9K
Jul 12, 2010
07/10
by
NON
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Descriptive and analytical information useful for the optimal design, specification, and performance evaluation of deep space telecommunications systems is presented. Telemetry, tracking, and command systems, receiver design, spacecraft antennas, frequency selection, interference, and modulation techniques are addressed.
Topics: ELECTRIC POTENTIAL, FLAT PLATES, PHOTOVOLTAIC CELLS, POWER CONDITIONING, CLIMATE, COMPUTERIZED...
Pressing needs in several contemporary power, military, and scientific areas have put severe requirements on power conditioning components. In an effort to advance the state of the art, component selection and development tests were collected into a major proposal in 1978-79 at Los Alamos National Laboratory by three interested divisions. One significant portion of that proposal created the 300-kW Capacitor Test Facility (CTF). This paper is the first report of the facility operation and...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *CAPACITORS, *TEST FACILITIES, MODELS, MONITORING,...
406
406
Jun 21, 2010
06/10
by
Boswinkle, R. W., Jr
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NASA acoustics research program on aircraft noise generation and reduction
Topics: CASCADE CONTROL, ELECTRICAL IMPEDANCE, GYRATORS, LOSSLESS EQUIPMENT, NETWORK SYNTHESIS, CONSTANTS,...
Pulsed Power Hydrodynamics (PPH) is an application of low-impedance pulsed power, and high magnetic field technology to the study of advanced hydrodynamic problems, instabilities, turbulence, and material properties. PPH can potentially be applied to the study of the properties of warm dense matter (WDM) as well. Exploration of the properties of warm dense matter such as equation of state, viscosity, conductivity is an emerging area of study focused on the behavior of matter at density near...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *ELECTROMAGNETIC PULSES, *HYDRODYNAMICS, ENERGETIC...
Topics: DTIC Archive, TEXTRON DEFENSE SYSTEMS EVERETT MA, *CARBON DIOXIDE LASERS, *TEA LASERS, MODE LOCKED...
Air Force currently has a strong need for the development of compact capacitors which are mechanically robust and thermally stable for operation in a variety of aerospace power conditioning applications. These applications demand better reliability and flexibility in the power system design as well as decreased thermal load for electronic system cooling. While power conditioning capacitors typically use polycarbonate (PC) dielectric films in wound capacitors for operation from -55 deg C to 125...
Topics: DTIC Archive, DAYTON UNIV OH RESEARCH INST, *DIELECTRIC FILMS, POLYMERS, ELECTRONIC EQUIPMENT,...
292
292
May 31, 2011
05/11
by
Herbst, Eric; DeLucia, Frank C
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Currently, millimeter-wave and submillimeter-wave spectroscopy is conducted in our laboratory on several different types of spectrometers. Our standard spectrometer utilizes the output of a phase-locked klystron operating in the 40-60 GHz region, which is sent into a crossed-waveguide harmonic generator, or ''multiplier''. The high frequency millimeter-and submillimeter-wave radiation is transmitted via quasi-optical techniques through an absorption cell and then onto a detector, which is...
Topics: HALL THRUSTERS, BREADBOARD MODELS, ELECTRONIC MODULES, HIGH VOLTAGES, POWER EFFICIENCY, POWER...
An analytical method was proposed for characterizing array power output, in the region of maximum power, as a function of environmental variables. The correlation provided a way of evaluating the output of an array under environmental conditions that differ from those encountered during testing. Power data obtained at one location was used to predict array performance at other locations.
Topics: NASA Technical Reports Server (NTRS), POWER CONDITIONING, SOLAR ARRAYS, SOLAR GENERATORS,...
Graphs and charts relative to magnetoplasmadynamic thruster power conditioning are given. Graphs show cathode evaporative mass loss, anode power friction, and anode fall. Past accomplishments and current research are outlined.
Topics: NASA Technical Reports Server (NTRS), ELECTRIC ROCKET ENGINES, MAGNETOPLASMADYNAMICS, PLASMA...
The NASA Solar Electric Propulsion Technology Application Readiness (NSTAR) program, managed by the Jet Propulsion Laboratory (JPL), is currently developing a high performance, simplified ion propulsion system. This propulsion system, which is throttleable from 0.5- to 2.3-kW output power to the thruster, targets primary propulsion applications for planetary and Earth-space missions and has been baselined as the primary propulsion system for the first New Millennium spacecraft. The NASA Lewis...
Topics: NASA Technical Reports Server (NTRS), ION PROPULSION, ROCKET ENGINES, POWER CONDITIONING, WEIGHT...
Low cost method is described for signal conditioning of pot-type transducers utilizing printed circuitry. Conditioner fits into standard rack, accommodates 56 channels, and can be operated by one attendant.
Topics: NASA Technical Reports Server (NTRS), POTENTIOMETERS (INSTRUMENTS), POWER CONDITIONING, PRESSURE...
A foil implosion system is described that integrates an explosive flux-compression generator, a flat plate feed section with power conditioning switches, and a vacuum electrode region containing a cylindrical foil/plasma load. Power conditioning, obtained with an explosive-driven plasma compression opening switch and explosive-actuated closing switches, provides a submicrosecond multimegampere pulse for the implosion of an aluminum plasma. The flat plate section is configured for bidirectional...
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *FOILS(MATERIALS), *IMPLOSIONS, *POWER CONDITIONING,...
This report summarizes the activities at the Advanced Microgrid Concepts and Technologies workshop hosted by the U.S. Army Research Laboratory (ARL) on June 7 8, 2012, in Washington Beltsville, MD. The workshop gathered experts from academia, national labs, Department of the Army (DA), and industry to assist the Army in identifying and prioritizing research and development (R&D) areas relevant to microgrid technologies. The workshop consisted of six technical sessions in the areas of Power...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *ENERGY...
The continuously increasing demand for electric power and the economic access to remote renewable energy sources such as off-shore wind power or solar thermal generation in deserts have revived the interest in high-voltage direct current HVDC multiterminal systems networks . A lot of work was done in this area, especially in the 1980s, but only two three-terminal systems were realized. Since then, HVDC technology has advanced considerably and, despite numerous technical challenges, the...
Topics: Electrical Engineering, Distributed generation, Renewable energy sources, Fuel cell systems,...
This paper describes a dynamic model of a SOFC fuel cell, which can be used in transient stability studies. The model is applied to a distributed utility grid that uses a fuel cell and a gas turbine as distributed generators DGs . Transient stability of the system is investigated for different DGs power outputs using a software developed based on the commercial Power System Tool Box and SIMULINK in MATLAB. A method for interfacing the fuel cell to the grid is presented. Transient stability is...
Topics: Electrical Engineering, Distributed generation, Renewable energy sources, Fuel cell systems,...
The generation of high power microwaves using explosively driven pulsed power is of particular interest to the defense community. The high energy density of explosives provides the opportunity to design pulsed power systems which occupy significantly less volume, yet provide the same output power, as traditional methods of High Power Microwave (HPM) production. Utilizing a Flux Compression Generator (FCG) as explosive driver necessitates introducing an intermediate Power Conditioning System...
Topics: DTIC Archive, TEXAS TECH UNIV LUBBOCK CENTER FOR PULSED POWER AND POWER ELECTRONICS, *POWER...
163
163
Jul 11, 2010
07/10
by
Wong, E. L.; Bittker, D. A
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Experiments using simulated solar radiation in a chamber, with a controlled atmospheric pressure near 1 atmosphere, were conducted to evaluate O3 production. The effects of CO and H2O were analyzed to determine if the CO and H2O addition could reduce NO destruction of O3. The results show that NO is destroyed while destroying O3.
Topics: ANALOG CIRCUITS, DIRECT POWER GENERATORS, POWER CONDITIONING, BREADBOARD MODELS, DIRECT CURRENT,...
Disclosure is made of an integrated-magnetic apparatus, comprising: winding structure for insulatingly carrying at least two generally flat, laterally offset and spaced apart electrical windings of a power converter around an aperture; a core having a flat exterior face, an interior cavity and an un-gapped core-column that is located within the cavity and that passes through the aperture of the winding structure; flat-sided surface carried by the core and forming an interior chamber that is...
Topics: NASA Technical Reports Server (NTRS), WINDING, MAGNETS, DIRECT POWER GENERATORS, POWER CONVERTERS,...
Renewable energy generation is quickly rising in the power sector industry and extensively used for two groups grid connected and standalone system. This paper gives the insights about fuel cell process and application of many power electronics systems. The fuel cell voltage drops bit by bit with increase in current because of losses related with fuel cell. It is difficult to control large rated fuel cell based power system without regulating tool. The issue associated with fuel based...
Topics: Electrical Engineering, Distributed generation, Renewable energy sources, Fuel cell systems,...
An improved feedback control system to govern the cyclic operation of the power switch of a non-dissipative power conditioning equipment. The apparatus includes two or three control loops working in unison. The first causes the output DC level to be compared with a reference, and the error amplified for control purposes. The second utilizes the AC component of the voltage across the output filter inductor or the current through the output filter capacitor, and the third loop senses the output...
Topics: NASA Technical Reports Server (NTRS), DISSIPATION, FEEDBACK CONTROL, POWER CONDITIONING, SWITCHES,...
The efficiencies of a microwave power tube with a multistage depressed collector and of the power supply driving the tube are computed. An analytical expression for the collector efficiency, which includes the effect of secondary emission and the radial component of velocity, is derived for a hypothetical current probability distribution function. In addition, collector efficiency is calculated with the aid of a digital computer for a specific current distribution. The efficiency of the power...
Topics: NASA Technical Reports Server (NTRS), CURRENT DISTRIBUTION, ESTIMATES, MICROWAVE TUBES, POWER...
This report is a survey of the state of the art of high voltage dc systems and components. This information can be used for consideration of an alternative secondary distribution (120 Vdc) system for the Space Station. All HVdc components have been prototyped or developed for terrestrial, aircraft, and spacecraft applications, and are applicable for general space application with appropriate modification and qualification. HVdc systems offer a safe, reliable, low mass, high efficiency and low...
Topics: NASA Technical Reports Server (NTRS), DIRECT CURRENT, POWER CONDITIONING, SPACECRAFT POWER...
998
998
Jul 12, 2010
07/10
by
Britcher, C. P
texts
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Wind tunnel magnetic suspension and balance systems (MSBSs) have so far failed to find application at the large physical scales necessary for the majority of aerodynamic testing. Three areas of technology relevant to such application are investigated. Two variants of the Spanwise Magnet roll torque generation scheme are studied. Spanwise Permanent Magnets are shown to be practical and are experimentally demonstrated. Extensive computations of the performance of the Spanwise Iron Magnet scheme...
Topics: ATTITUDE CONTROL, POWER CONDITIONING, SAFETY, SOLAR ARRAYS, ELECTROCHEMISTRY, ENERGY STORAGE,...
A conditioning circuit is provided with a constant current diode in series with a zener diode, the former having a high dynamic impedance and the latter a low dynamic impedance. The constant current diode can receive an input voltage with PARD. In conjunction with the zener diode fixed to a ground, a voltage divider is provided which can give an output voltage whose PARD was significantly reduced. The conditioning circuit is effective down to dc.
Topics: NASA Technical Reports Server (NTRS), CIRCUITS, IMPEDANCE, POWER CONDITIONING, DIODES, DIRECT...
In December, 1986, a Center Director's Discretionary Fund (CDDF) proposal was granted to study power system control techniques in large space electrical power systems. Presented are the accomplishments in the area of power system control by power quality load management. In addition, information concerning the distortion problems in a 20 kHz ac power system is presented.
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC CONTROL, LARGE SPACE STRUCTURES, SPACECRAFT POWER...
Electric motors and generators that use permarotating machinery, but aspects of control and power conditioning are also considered. The discussion is structured around three basic areas: rotating machine design considerations presents various configuration and material options, generator applications provides insight into utilization areas and shows actual hardware and test results, and motor applications provides the same type of information for drive systems.
Topics: NASA Technical Reports Server (NTRS), ELECTRIC GENERATORS, ELECTRIC MOTORS, MAGNETS, ALLOYS, DESIGN...
Light-weight flight type double focus and quadruple mass spectrometer models were compared. Data cover size, weight, and power sensitivity required to achieve same resolution sensitivity at given mass number. Comparison was made using mathematical relationships. Analysis was confined to equal ion source area sensitivity variations not more than 40% over mass range.
Topics: NASA Technical Reports Server (NTRS), DYNAMIC CHARACTERISTICS, ION SOURCES, MASS SPECTROMETERS,...
This is a report of Task 6, the last task of the first phase of an effort to develop a microprocessor-based power conditioner controller. The objective of the first phase is to produce a controller that will regulate the output voltage in the Delco 15 KW power conditioner. This task, System Debug, will combine and debug the controller hardware and software which were developed and tested independent of each other in the previous tasks.
Topics: DTIC Archive, YUCCA INTERNATIONAL INC SCOTTSCALE AZ, *MICROPROCESSORS, COMPUTER PROGRAMS,...
This paper analyzes the use of GaAs photoconductive switches and a 2 m radius. radial transmission line section to generate acceleration gradients of up to 50 MV/m for nanosecond duration. 4 kA beam current pulses. The proposed acceleration system is much simpler and easier to precisely synchronize than the annular electron beam wake field accelerator designs proposed elsewhere. The design of an accelerator module with annular Blumlein line pulse generator. GaAs switches and associated optical...
Topics: DTIC Archive, TEXAS UNIV AT ARLINGTON, *PHOTOCONDUCTIVITY, *SWITCHES, *TRANSMISSION LINES, GALLIUM...
The electron beam gun system consists of a 5 x 25 cm aperture hot cathode gun and a thyratron switched line type high voltage pulse modulator. The gun is cathode pulsed with an operating range of 10 to 40 microseconds at a maximum voltage of 220 kV and maximum peak current of 20 amps. The equipment may be operated at a steady prf up to 150 pps for 15 seconds or in a burst mode of a few pulses each equivalent to the steady state rating. The pulse to pulse voltage stability is achieved at the...
Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *CATHODES, *ELECTRON BEAMS, *ELECTRON GUNS,...
893
893
May 28, 2011
05/11
by
Gern, Frank H.; Naghshineh, Amir H.; Sulaeman, Erwin; Kapania, Rakesh K.; Haftka, Raphael T
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This paper describes a structural and aeroelastic model for wing sizing and weight calculation of a strut-braced wing. The wing weight is calculated using a newly developed structural weight analysis module considering the special nature of strut-braced wings. A specially developed aeroelastic model enables one to consider wing flexibility and spanload redistribution during in-flight maneuvers. The structural model uses a hexagonal wing-box featuring skin panels, stringers, and spar caps,...
Topics: POWER CONVERTERS, SPACECRAFT POWER SUPPLIES, POWER MODULES (STS), POWER CONDITIONING, INTERNATIONAL...
Report of the design, fabrication and test of Electronic Control Unit (ECU) for Dual Mode Electro/Pneumatic Actuator. Integration tests establish control capability of ECU in both pneumatic and electric modes. Closed-loop operation fully implemented in design. Evaluation restricted to open-loop due to limited actuator performance.
Topics: DTIC Archive, Himich, James, BENDIX CORP TETERBORO NJ FLIGHT SYSTEMS DIV, *PNEUMATIC ACTUATORS,...
218
218
May 21, 2011
05/11
by
Ward, John L.; Mcintire, Gerr
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The NASA Satellite Instrumentation Calibrator (NASIC) is a visible and near-infrared spectrometer used to calibrate various satellite instruments by underflying those instruments in a NASA ER-2 aircraft. The calibration instrument's hardware and software are documented. The design, operation, and function of an Ebert-Fastie monochronomator, which by means of a moveable diffraction grating, becomes a visible and near-infrared spectrometer used to calibrate satellite-borne instruments by high...
Topics: EARTH ORBITS, SILICON, SOLAR CELLS, RADIANT FLUX DENSITY, RADIATION DAMAGE, SOLAR ARRAYS, CHARGED...
The work in power processing is reported. Input-output models, and Lie groups in control theory are discussed along with the methods of analysis for time invariant electrical networks.
Topics: NASA Technical Reports Server (NTRS), LIE GROUPS, POWER CONDITIONING, CONTROL THEORY, MATHEMATICAL...
The circuit presented is simple and small enough to be included in a typical battery charge/power control assembly, yet provides the advantage of a complete ground-type battery reconditioning discharge. Test results on the circuit when used to recondition two 24 cell, 20 A-h nickel-cadmium batteries are given. These results show that a battery reconditioned with this circuit returns to greater than 90 percent of its original capacity (greater than nameplate capacity) and follows a typical new...
Topics: NASA Technical Reports Server (NTRS), CIRCUITS, NICKEL CADMIUM BATTERIES, POWER CONDITIONING, LOW...
A 15kJoule, Flash Lamp Power Conditioning Unit has been successfully designed, developed, and deployed in the National Ignition Facility (NIF) Preamplifier Modules (PAM). The primary design philosophy of this power conditioning unit (PCU) is safety, reliability, and manufacturability. Cost reduction over commercially equivalent systems was also achieved through an easily manufactured packaging design optimized to meet NIF requirements. While still maintaining low cost, the PCU design includes a...
Topics: DTIC Archive, LAWRENCE LIVERMORE NATIONAL LAB CA, *POWER CONDITIONING, CONTROL SYSTEMS, COST...
Data were compiled for the purpose of evaluating the effect of power/temperature step stress when applied to a variety of semiconductor devices. The switching diode JANTX1N5554 is examined.
Topics: NASA Technical Reports Server (NTRS), DIODES, ELECTRONIC EQUIPMENT TESTS, POWER CONDITIONING,...
Highlights of activities conducted during the reporting period to facilitate the exchange of technical information among scientists and engineers both within the federal government and within industry are cited. Interagency Advanced Power Group meetings and special efforts, project briefs, and organization development are considered.
Topics: NASA Technical Reports Server (NTRS), ENERGY TECHNOLOGY, INFORMATION DISSEMINATION, ORGANIZATIONS,...
Two approaches for using explosives to interrupt current flowing in solid conductors are described. One concept uses explosives to extrude the switch conductor into thin regions that fuse due to current in the switch. A preliminary scaling law is presented. The second approach employs dielectric jets to sever current carrying conductors. A feasibility experiment and an improved design are described.
Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *ELECTRIC CONDUCTORS, CIRCUITS, DEFORMATION, EXPLOSIVES,...
The function of the Space Station Furnace Facility (SSFF) is to support materials research into the crystal growth and solidification processes of electronic and photonic materials, metals and alloys, and glasses and ceramics. To support this broad base of research requirements, the SSFF will employ a variety of furnace modules which will be operated, regulated, and supported by a core of common subsystems. Furnace modules may be reconfigured or specifically developed to provide unique...
Topics: NASA Technical Reports Server (NTRS), CRYSTAL GROWTH, FURNACES, MODULES, SOLIDIFICATION, SPACE...
The preliminary requirements and technology advances required for cost effective space power management systems for multi-100 kilowatt requirements were identified. System requirements were defined by establishing a baseline space platform in the 250 KE KWe range and examining typical user loads and interfaces. The most critical design parameters identified for detailed analysis include: increased distribution voltages and space plasma losses, the choice between ac and dc distribution systems,...
Topics: NASA Technical Reports Server (NTRS), POWER CONDITIONING, SPACE STATIONS, SPACECRAFT POWER...
Startup, operation in grid connect mode, shutdown from grid connects, operation in isolated mode, shutdown from isolated mode, steady state operation, mode transfers, and voltage disconnects are addressed.
Topics: NASA Technical Reports Server (NTRS), ELECTRIC POWER PLANTS, FUEL CELL POWER PLANTS, POWER...
