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1993

Propulsion and Power

Articles 1 - 5 of 5

Full-Text Articles in Physics

Solid Rocket Motor Nde Using Nuclear Magnetic Resonance, Lowell Burnett, Dale R. Mckay, Erik M. Magnuson, E. J. Vanderheiden Jan 1993

Solid Rocket Motor Nde Using Nuclear Magnetic Resonance, Lowell Burnett, Dale R. Mckay, Erik M. Magnuson, E. J. Vanderheiden

Review of Progress in Quantitative Nondestructive Evaluation

Solid rocket motors (SRMs) are complex integrated structures. An integral part of an SRM is the adhesive liner, which is used to bond the propellant to the insulator covering the inner surface of the case. In order to ensure SRM performance and reliability, the adhesive liner must be properly cured, of the specified thickness, and free of contamination. The goal of this study is to demonstrate the feasibility of a nuclear magnetic resonance (NMR) method to ensure that these conditions are met.


Computed Tomography Applications In Turbine Engine Overhaul, Ward Rummel, Mark Davis, Rodolfo Garcia Jan 1993

Computed Tomography Applications In Turbine Engine Overhaul, Ward Rummel, Mark Davis, Rodolfo Garcia

Review of Progress in Quantitative Nondestructive Evaluation

The United States Air Force has an initiative for technology development and implementation in design, production, acceptance and maintenance overhaul operations. As a part of this initiative, an x-ray computed tomography capability was acquired for use in the support of aircraft structures and gas turbine engine overhaul applications at Kelly Air Force Base, Texas. Implementation of the technology into the Kelly work flow has required acquisition of the knowledge and skills required to use the system, and re-analysis of work functions to assess added capability, measurement precision, reliability and productivity. At the same time, the nature of the data / information ...


Development And Application Of Local 3-D Ct Reconstruction Software For Imaging Critical Regions In Large Ceramic Turbine Rotors, E. Sivers, D. L. Holloway, W. A. Ellingson, J. Ling Jan 1993

Development And Application Of Local 3-D Ct Reconstruction Software For Imaging Critical Regions In Large Ceramic Turbine Rotors, E. Sivers, D. L. Holloway, W. A. Ellingson, J. Ling

Review of Progress in Quantitative Nondestructive Evaluation

Current 3-D X-ray CT imaging technology is limited in some cases by the size and sensitivity of the X-ray detector. This limitation can be overcome to some degree by the use of region-of-interest (ROI) reconstruction software when only part of a larger object need be examined. However, images produced from ROI data often exhibit severe density shading if they are reconstructed by unaltered 3-D X-ray CT algorithms (called Global methods here). These density artifacts can be so severe that low-contrast features are hidden. Time-consuming methods introduced previously to remedy these artifacts require specialized processing to replace or approximate the missing ...


Laser Shearographic Testing Of Foam Insulation On Cryogenic Fuel Tanks, Douglas Burleigh, James E. Engel, David R. Kuhns Jan 1993

Laser Shearographic Testing Of Foam Insulation On Cryogenic Fuel Tanks, Douglas Burleigh, James E. Engel, David R. Kuhns

Review of Progress in Quantitative Nondestructive Evaluation

The Centaur is a high-energy rocket used as a second stage to the Atlas launch vehicle. The Centaur is cryogenically fueled, using liquid hydrogen and liquid oxygen, and requires insulation to prevent fuel boiloff prior to launch. The original insulation system used on Centaur is a set of fiberglass honeycomb panels, which are jettisoned after launch. These panels are still used on the Atlas I version of Atlas/Centaur.


Shearography With Syncrhonized Pressure Stressing, Tom Chatters, Bruno Pouet, Sridhar Krishnaswamy Jan 1993

Shearography With Syncrhonized Pressure Stressing, Tom Chatters, Bruno Pouet, Sridhar Krishnaswamy

Review of Progress in Quantitative Nondestructive Evaluation

Non-destructive evaluation (NDE) techniques of optical video-based speckle interferometry are gaining importance as inspection tools, particularly by the aerospace industry [1,2]. An optical technique such as shearography is attractive to the NDE community largely because of its non-contacting nature, full-field measurement and fast inspection results. However, in order for this optical interferometric method to become widely used as an NDE tool, this technique must be made to be robust enough to operate in noisy environments typically found in industry settings. In this paper, we address these issues for the case of detection of disbonds using shearography in conjunction with ...