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A comparison of spanwise aerodynamic loads estimated from measured bending moments versus direct pressure measurements on horizontal axis wind turbine blades

Description: Two methods can be used to determine aerodynamic loads on a rotating wind turbine blade. The first is to make direct pressure measurements on the blade surface. This is a difficult process requiring costly pressure instrumentation. The second method uses measured flap bending moments in conjunction with analytical techniques to estimate airloads. This method, called ALEST, was originally developed for use on helicopter rotors and was modified for use on horizontal axis wind turbine blades. Esti… more
Date: October 1, 1991
Creator: Simms, D A & Butterfield, C P
Partner: UNT Libraries Government Documents Department
open access

Frequency-domain stress prediction algorithm for the LIFE2 fatigue analysis code

Description: The LIFE2 computer code is a fatigue/fracture analysis code that is specialized to the analysis of wind turbine components. The numerical formulation of the code uses a series of cycle mount matrices to describe the cyclic stress states imposed upon the turbine. However, many structural analysis techniques yield frequency-domain stress spectra and a large body of experimental loads (stress) data is reported in the frequency domain. To permit the analysis of this class of data, a Fourier analysi… more
Date: January 1, 1992
Creator: Sutherland, H. J.
Partner: UNT Libraries Government Documents Department
open access

Torque ripple in a Darrieus, vertical axis wind turbine

Description: Interaction between a steady wind and a rotating, Darrieus, vertical axis wind turbine produces time periodic aerodynamic loads which cause time dependent torque variations, referred to as torque ripple, to occur in the mechanical link between the turbine and the electrical generator. There is concern for the effect of torque ripple upon fatigue life of drive train components and upon power quality. An analytical solution characterizing the phenomenon of torque ripple has been obtained which is… more
Date: January 1, 1980
Creator: Reuter, R.C. Jr.
Partner: UNT Libraries Government Documents Department
open access

Screening method for wind energy conversion systems

Description: A screening method is presented for evaluating wind energy conversion systems (WECS) logically and consistently. It is a set of procedures supported by a data base for large conventional WECS. The procedures are flexible enough to accommodate concepts lacking cost and engineering detail, as is the case with many innovative wind energy conversion systems (IWECS). The method uses both value indicators and simplified cost estimating procedures. Value indicators are selected ratios of engineering p… more
Date: March 1, 1980
Creator: McConnell, R.D.
Partner: UNT Libraries Government Documents Department
open access

Photoelastic stress analysis on a Phoenix 7. 9-meter blade

Description: Photoelastic tests were conducted on the Phoenix 7.9-meter blade to develop the basic methodology for locating critical strain areas on full-scale composite structures. Under relatively low elastic loading the strain fields over various regions on the blade planform were documented with 35mm photographs under different loading conditions at the Solar Energy Research Institute (SERI) Structural Test Facility (STF). Strain concentrations were easily located and quantified. Principal strain magnit… more
Date: October 1, 1991
Creator: Musial, W. D.; Jenks, M. D.; Osgood, R. M. & Johnson, J. A.
Partner: UNT Libraries Government Documents Department
open access

DOE candidate site meteorological measurement program

Description: In March 1976, DOE issued an RFP to acquire, on a competitive basis, a group of candidate sites, proposed by utilities interested in the field testing program. A total of 17 candidate sites were selected from the 64 proposals submitted in response to the RFP. From these sites, five have been chosen thus far to receive turbines for field testing. This paper discusses the meteorological measurement activities at these sites and provides details of the measurement program as it exists in late 1979… more
Date: January 1, 1980
Creator: Renne, D. S. & Sandusky, W. F.
Partner: UNT Libraries Government Documents Department
open access

Summary of proceedings: Oklahoma and Texas wind energy forum, April 2-3, 1981

Description: The Wind Energy Forum for Oklahoma and Texas was held at the Amarillo Quality Inn in Amarillo, Texas on April 2-3, 1981. Its purpose was to bring together the diverse groups involved in wind energy development in the Oklahoma and Texas region to explore the future commercial potential and current barriers to achieving this potential. Major topics of discussion included utility interconnection of wind machines and the buy-back rate for excess power, wind system reliability and maintenance concer… more
Date: June 1, 1981
Creator: Nelson, S. C. & Ball, D. E.
Partner: UNT Libraries Government Documents Department
open access

A PC-based telemetry system for acquiring and reducing data from multiple PCM streams

Description: The Solar Energy Research Institute's (SERI) Wind Research Program is using Pulse Code Modulation (PCM) telemetry data-acquisition systems to study horizontal-axis wind turbines. Many PCM systems are combined for use in test installations that require accurate measurements from a variety of different locations. SERI has found them ideal for data-acquisition from multiple wind turbines and meteorological towers in wind parks. A major problem has been in providing the capability to quickly c… more
Date: July 1, 1991
Creator: Simms, D A & Butterfield, C P
Partner: UNT Libraries Government Documents Department
open access

Product liability insurance for WECS

Description: Preliminary findings from a sampling of manufacturers indicate that, in many cases, product liability insurance for WECS is still difficult to obtain. About half of the 21 WECS manufacturers contacted said they did not have product liability insurance. About one manufacturer in three who attempted to obtain insurance was rejected by at least one insurance company. In some instances, although an insurer had offered to provide coverage, the manufacturer found the rates quoted to be prohibitively … more
Date: June 1, 1980
Creator: Noun, R.J.
Partner: UNT Libraries Government Documents Department
open access

Economics of selected WECS dispersed applications

Description: An economic analysis for distributed Wind Energy Conversion Systems (WECS) was conducted for the Department of Energy (DOE) as part of the Solar Commercial Readiness Assessment task at the Solar Energy Research Institute (SERI). The major objective of the study is to analyze: the cost of electricity generated by selected wind energy systems in residential and agricultural applications; the breakeven cost of wind systems able to compete economically with conventional power sources in dispersed a… more
Date: February 1, 1980
Creator: Krawiec, S.
Partner: UNT Libraries Government Documents Department
open access

Wind Energy Innovative Systems conference proceedings

Description: Separate abstracts are included for 20 of the 22 papers presented concerning innovative wind turbines which vary in design from the standard horizontal-axis propellor-type wind turbines. Two papers have been previously included in the data base.
Date: December 1, 1979
Creator: Vas, I. E.
Partner: UNT Libraries Government Documents Department
open access

Solar 79 Northwest

Description: The highlights of the many public programs are described and summaries of plenary session speeches are included. Names, addresses, and solar interest codes of conference registrants are included. Eleven technical papers or summaries are included. A separate citation was prepared for each one. (MHR)
Date: January 1, 1979
Creator: King, S
Partner: UNT Libraries Government Documents Department
open access

Wind characteristics for agricultural wind energy applications

Description: Wind energy utilization in agriculture can provide a potentially significant savings in fuel oil consumption and ultimately a cost savings to the farmer. A knowledge of the wind characteristics within a region and at a location can contribute greatly to a more efficient and cost-effective use of this resource. Current research indicates that the important wind characteristics include mean annual wind speed and the frequency distribution of the wind, seasonal and diurnal variations in wind speed… more
Date: January 1, 1979
Creator: Renne, D. S.
Partner: UNT Libraries Government Documents Department
open access

Modeling the Benefits of Storage Technologies to Wind Power

Description: Rapid expansion of wind power in the electricity sector is raising questions about how wind resource variability might affect the capacity value of wind farms at high levels of penetration. Electricity storage, with the capability to shift wind energy from periods of low demand to peak times and to smooth fluctuations in output, may have a role in bolstering the value of wind power at levels of penetration envisioned by a new Department of Energy report ('20% Wind by 2030, Increasing Wind Energ… more
Date: June 1, 2008
Creator: Sullivan, P.; Short, W. & Blair, N.
Partner: UNT Libraries Government Documents Department
open access

Wind Energy Status and Future Wind Engineering Challenges: Preprint

Description: This paper describes the current status of wind energy technology, the potential for future wind energy development and the science and engineering challenges that must be overcome for the technology to meet its potential.
Date: August 1, 2008
Creator: Thresher, R.; Schreck, S.; Robinson, M. & Veers, P.
Partner: UNT Libraries Government Documents Department
open access

Overview of Offshore Wind Technology: Preprint

Description: This paper provides a short overview of some of the challenges facing the growth of offshore wind energy technology.
Date: October 1, 2007
Creator: Butterfield, C. P.; Musial, W. & Jonkman, J.
Partner: UNT Libraries Government Documents Department
open access

Wind Energy Technology: Current Status and R&D Future

Description: This paper discusses the development of wind energy technology past, present and future.
Date: August 1, 2008
Creator: Thresher, R.; Robinsion, M. & Veers, P.
Partner: UNT Libraries Government Documents Department
open access

Do Wind Forecasts Make Good Generation Schedules? Preprint

Description: Energy market scheduling conventions can needlessly increase the wind balancing area's regulation requirements. This economic inefficiency can be eliminated once it is recognized. The paper provides a detailed discussion of these issues.
Date: June 1, 2008
Creator: Dragoon, K.; Kirby, B. & Milligan, M.
Partner: UNT Libraries Government Documents Department
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