A fiberglass blade was designed for the Atlantic Orient Corporation (AOC) H/50 wind turbine through the use of finite element (FE) modeling techniques. In this initial design phase, the goals were: 1) make the blade as stiff as the previously designed laminated wood blade, 2) minimize resonant operating conditions, 3) design the blade to withstand extreme wind conditions, and 4) make the blade compatible with reasonable manufacturing techniques. The modeling assumptions used are discussed and the final results, for this initial design phase, are presented. Based on the J?E model, the designed blade will be able to withstand extreme wind conditions through elastic deformation, and resonant operating conditions will be minimized. This document is an overview of the design and manufacturing synthesis data of composite wind turbine blades for applications to the Sandia National Laboratories' NuMAD wind turbine blade design tool. The basic blade design was completed under Montana DOE EPSCoR, Wind Energy Cluster Contract #DE-F02-91-ER-75681. This document was prepared as partial fulfillment of Sandia contract BC-3536. iv Contents Acknowledgments iv Lit of Figures and Tables

cal the ble A major purpose ot the I echnl-Information Center is to provide broadest dissemination possiof information contained in DOE'S Research and Development Reports to business, industry, the academic community, and federal, state and local governments. Although a small portion of this report is not reproducible, it is being the availability of information on the research discussed herein.

Options were added to the PRONTO2D and PRONTO3D structural dynamics finite element codes to include the effect of a traveling pressure front that follows a projectile while transiting pressurizing axisymmetric and nonstraight gun tubes. Pressure varied in magnitude and location with time and projectile displacement to predict the dynamic structural response of the projectile and gun tube. Two and three-dimensional simulations were performed to study the effect of this pressure front and its influence on projectile gun tube interaction and lateral movement of the projectile in the gun tube caused by variation of the gun centerline during projectile launch and recoil. Discussions of theory, implementation, and results from simulations are presented.

No abstract

Three-chmenslomd numencitl slmukttlons were pertormed 10I determine the effect of an asymmernc base pressure on kinetic energy projectiles during launch. A mmrix of simulations was performed in two I sepaxate launch environments. One launch environment represented a severe lateral load environment, while the ocher represented a nonsevere lateral load environment based on the gun tube straightness. The orientation of the asymmetric pressure field, its duration, the projectile's initial position, and the tube stzaighcness were altered to determine the effects of eitch parameter. The pressure asymmetry translates down che launch tube to exit parameters and is not washed out by tube profile. Results from tie matrix of simulations are presented.