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Probabilistic models of the stress-rupture of composite materials: Phase III. Progress report, June 15, 1978-June 14, 1980

Description: The development of static and time dependent models for the failure of composite materials has been pursued. These models are based on the chain-of-bundles probability model for composite failure wherein local load sharing among non-failed fiber elements in a bundle plays a key role. At the outset, it was believed that the static model was well developed in the literature by others, and that work on the time dependent versions could proceed. In these versions, the viscoelasticity of the matrix … more
Date: March 1, 1980
Creator: Phoenix, S.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Compilation and summary of technical and economic assessments in the field of energy storage

Description: Information is presented which was extracted from various assessments of energy storage technologies conducted during the past four years, primarily under the auspices of the Office of Energy Systems Research and Development (formerly the Division of Energy Storage Systems). A thorough search of the relevant literature was conducted using the DOE/RECON computerized data base and other sources. Only tabular or graphic material was abstracted from the documents. The material has been organized in… more
Date: October 1, 1981
Creator: DeVries, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electric and Hybrid Vehicle System Research and Development Project: hybrid vehicle potential assessment. Volume V. Flywheel systems

Description: The design, operation and calculated performance of a flywheel-electric hybrid vehicle are discussed. Seven different operating strategies are considered. The calculation procedures are described. The results are plotted. (LCL)
Date: September 30, 1979
Creator: Liddle, S. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hybrid vehicle potential assessment. Volume 10. Electric and hybrid vehicle cost handbook

Description: The purpose of this interim cost handbood is to provide a consistent single-point source of data and procedures for estimating the costs of electric and hybrid vehicles. These costs include manufacturing, acquisition (purchase price), operating, and life cycle. Each suggested Cost Estimating Relation (CER) presented herein is a result of the compilation of currently existing cost estimates and cost relationships. No independent cost analysis was performed for this handbook, nor was any analysis… more
Date: September 30, 1979
Creator: Heft, R.C. & Heller, S.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Impact of flywheel-energy-storage technology upon taxicab fleet operation in a large metropolitan city

Description: The incorporation of flywheel energy storage systems (FESS) into automotive vehicles has been under consideration for some time. Previous studies have suggested that FESS can yield substantial benefits in automotive vehicle operation, particularly for urban driving. An assessment of the impacts resulting from incorporation of FESS into automotive fleets in a large metropolitan city is described. Specifically, the case of taxicab fleet operation within New York City is examined. Unique features … more
Date: January 1, 1981
Creator: Krupka, M.C. & Jackson, S.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Flywheel rotor and containment technology development, FY83

Description: The Department of Energy decided to terminate the Flywheel Rotor and Containment Technology Development project during FY 1983. Activities this year included fabrication, inspection, and test evaluation of rotor and containment structures. A peak energy of 700 Wh was stored at an energy density of 70 Wh/kg. In cyclic tests, 10,000 cycles from design speed to half speed were logged without failure. The first test of a lightweight containment structure indicates the need for additional developmen… more
Date: September 12, 1983
Creator: Mohr, P. B. & Walter, C. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Oak Ridge Flywheel Evaluation Laboratory. Annual report, April 1, 1979-September 30, 1979

Description: The Oak Ridge Flywheel Evaluation Laboratory (ORFEL) was assembled, and the initial stages of proof testing were completed in FY 1979. The significant accomplishments for the past year included the establishment of adequate full-time personnel; facility modification to reflect the emphasis on flywheel evaluation over simple testing; and the facility proof test involving two aluminum disk flywheels and one composite flywheel. This report contains details of the FY 1979 program plans for ORFEL, p… more
Date: December 1, 1979
Creator: Steele, R.S. Jr.; Casstevens, J.M. & Sutton, B.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Near-term electric test vehicle ETV-2. Phase II. Final report

Description: A unique battery-powered passenger vehicle has been developed that provides a significant improvement over conventional electric vehicle performance, particularly during stop-and-go driving. The vehicle is unique in two major respects: (1) the power system incorporates a flywheel that stores energy during regenerative braking and makes possible the acceleration capability needed to keep up with traffic without reducing range to unacceptable values; and (2) lightweight plastic materials are used… more
Date: April 1, 1981
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flywheel rotor and containment technology development

Description: The goals of the project are: to develop an economical and practical composite flywheel having an energy density of 88 Wh/kg at failure, an operational energy density of 44 to 55 Wh/kg, and an energy storage capacity of approximately 1 kWh; to determine the suitability of various manufacturing processes for low-cost rotor fabrication; to investigate flywheel and flywheel-systems dynamics; to test and evaluate prototype rotors for use in transportation and stationary applications; and to develop… more
Date: August 11, 1981
Creator: Kulkarni, S.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Frequency analysis of a thick-rim flywheel. [NONSAP]

Description: The calculation of natural frequencies of a thick-rim flywheel is presented using two analysis methods: the finite-element method and the transfer matrix method. A listing of the computer program developed using the transfer matrix method is included. The results of the finite-element analyses indicate that the computer programs NONSAP and ADINA are incapable of determining out-of-plane natural frequencies of the flywheel. The results of the analysis using the transfer matrix method are satisfa… more
Date: September 1, 1978
Creator: Fanning, D. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Design guide for composite-material flywheels: rotor dyamic considerations. Part I. System whirling and stability. Final report

Description: Information to designers of flywheels is provided which will enable them to predict many aspects of the dynamic behavior of their flywheel systems when spin-tested with a quill-shaft support and driven by an air turbine. Computer programs are presented for the following dynamic analysis to obtain the results indicated: free whirling for natural frequencies versus rotational speed and the associated mode shapes; rough-type stability analysis for determining the stability limits; and forced whirl… more
Date: September 1, 1981
Creator: Bert, C.W. & Ramunujam, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Low-cost windmill that could be manufactured from local materials. Final report

Description: Two model windmills are described briefly. The first is a two-bladed rigidly mounted model with a weather vane for locking the blades in a neutral position in high winds. The second is a three-bladed model mounted on a flexible tower that bends in high winds. The three-bladed model is equipped with a flywheel. Publicity for the windmills is also described briefly. (LEW)
Date: unknown
Creator: Donaldson, J.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Reference concepts for a space-based hydrogen-oxygen combustion, turboalternator, burst power system

Description: This report describes reference concepts for a hydrogen-oxygen combustion, turboalternator power system that supplies power during battle engagement to a space-based, ballistic missile defense platform. All of the concepts are open''; that is, they exhaust hydrogen or a mixture of hydrogen and water vapor into space. We considered the situation where hydrogen is presumed to be free to the power system because it is also needed to cool the platform's weapon and the situation where hydrogen is no… more
Date: July 1, 1990
Creator: Edenburn, Michael W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Electric-powered passenger vehicle design study program. Task 1. Tradeoff studies

Description: Using the baseline vehicle and power system design established previously to meet the performance goals of the program, three power system computer simulation programs were prepared for the basic vehicle tradeoff studies. These programs simulate the performance of the power system and vehicle over different types of driving conditions such as maximum power acceleration, deceleration, city driving cycles, and hill climbing, and permit accurate determination of the benefits of the unique hybrid p… more
Date: September 16, 1976
Creator: Rowlett, B.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Oak Ridge Flywheel Evaluation Laboratory. Annual report, October 1, 1979-September 30, 1980

Description: The purpose of the Oak Ridge Flywheel Evaluation Laboratory Annual Report is to present work performed for and funded by the Mechanical Energy Storage Technology Project at Lawrence Livermore National Laboratory (LLNL). In addition to the management sections (schedules, budgets, and facility accomplishments), summaries are given for the ultimate speed evaluations of one flywheel built by Union Carbide Corporation, Nuclear Division (UCC-ND); four flywheels constructed under subcontracts from San… more
Date: April 30, 1981
Creator: Steele, Jr., R. S.; Babelay, Jr., E. F. & Sutton, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultrasonic detection of fatigue damage in glass-epoxy composites

Description: Energy storage flywheels fabricated of S2 glass-epoxy composite were studied to determine the behavior of the ultrasonic properties as a function of strain history and to identify possible predictors of incipient failure. Tensile specimens of the flywheel material were loaded uniaxially, and the ultrasonic properties (i.e., the shear and longitudinal wave velocities and the attenuation) were measured as a function of strain. Finished flywheels were similarly tested at various stages during cycl… more
Date: January 1, 1990
Creator: Simpson, W. A., Jr. & McClung, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Low-cost flywheel demonstration program. Final report

Description: The Applied Physics Laboratory/Department of Energy Low Cost Flywheel Demonstration Program was initiated on 1 October 1977 and was successfully concluded on 31 December 19'9. The total cost of this program was $355,190. All primary objectives were successfully achieved as follows: demonstration of a full-size, 1)kWh flywheel having an estimated cost in large-volume production of approximately $50/kWh; developmeNt of a ball-bearing system having losses comparable to the losses in a totally magn… more
Date: April 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy programs. Quarterly report, January-March 1978

Description: The Johns Hopkins University Applied Physics Laboratory is engaged in the development of energy resources, energy utilization concepts, and energy storage methods. This Quarterly Report, summarizing work completed on the various tasks as of 31 March 1978, contains comments on limited tasks, short descriptions of meetings, trips, presentations, and other limited tasks of note performed in connection with major program tasks and articles that describe these program tasks briefly, summarize the pr… more
Date: 1978-04~
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low-cost flywheel demonstration program. Final report, 1 October 1977-31 December 1979

Description: The Applied Physics Laboratory/Department of Energy Low Cost Flywheel Demonstration Program was initiated on 1 October 1977 and was successfully concluded on 31 December 1979. The total cost of this program was $355,190. All primary objectives were successfully achieved as follows: demonstration of a full-size, 1-kWh flywheel having an estimated cost in large-volume production of approximately $50/kWh; development of a ball-bearing system having losses comparable to the losses in a totally magn… more
Date: April 1980
Creator: Rabenhorst, D. W.; Small, T. R. & Wilkinson, W. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Energy programs at the Johns Hopkins University Applied Physics Laboratory. Quarterly report, October--December 1978

Description: The Johns Hopkins University Applied Physics Laboratory, under contracts with the U.S. Department of Energy, the National Science Foundation, U.S. Maritime Administration, Maryland Department of Natural Resources, U.S. Department of Commerce, and U.S. Fish and Wildlife Service, is engaged in developing energy resources, utilization concepts, and storage methods. This report is divided into four sections. The first, Geothermal Energy Programs, contains reports on various geothermal investigation… more
Date: January 1979
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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