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Author: Publisher: ISBN: Category : Languages : en Pages : 31
Book Description
The goal of this project was to design and test strain gages based on attenuation of positrons emitted in the radioactive decay of neutron-poor nuclides. This new type of strain gage has the advantages of conventional mounted gages, but with a much higher temperature range, no adherence problems, and no electrical or fiber-optic connections. This type of wireless gage would be ideal for advanced, high-temperature turbine engines, and particularly for rotating parts.
Author: Publisher: ISBN: Category : Languages : en Pages : 31
Book Description
The goal of this project was to design and test strain gages based on attenuation of positrons emitted in the radioactive decay of neutron-poor nuclides. This new type of strain gage has the advantages of conventional mounted gages, but with a much higher temperature range, no adherence problems, and no electrical or fiber-optic connections. This type of wireless gage would be ideal for advanced, high-temperature turbine engines, and particularly for rotating parts.
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722274009 Category : Languages : en Pages : 26
Book Description
This report summarizes the results of a six month study that addressed specific issues to transfer the Pd-13Cr static strain sensor to a gas turbine engine environment. The application issues that were addressed include: (1) evaluation of a miniature, variable potentiometer for use as the ballast resistor, in conjunction with a conventional strain gage signal conditioning unit; (2) evaluation of a metal sheathed, platinum conductor leadwire assembly for use with the three-wire sensor; and (3) subjecting the sensor to dynamic strain cyclic testing to determine fatigue characteristics. Results indicate a useful static strain gage system at all temperature levels up to 1350 F. The fatigue characteristics also appear to be very promising, indicating a potential use in dynamic strain measurement applications. The procedure, set-up, and data for all tests are presented in this report. This report also discusses the specific strain gage installation technique for the Pd-13Cr gage because of its potential impact on the quality of the output data. Fichtel, Edward J. and Mcdaniel, Amos D. Unspecified Center NAS3-25952...
Author: B. R. Anderson Publisher: ISBN: Category : Airplanes Languages : en Pages : 9
Book Description
This paper covers recent advancements in the development and application of high-temperature strain gages for stress measurements in jet engines. Development of high-temperature strain gages can be divided into three areas: (1) alloys, (2) cements, and (3) fabrication and application techniques. In the Aircraft Gas Turbine Division, the measurement of vibratory stress and static stress are both of primary importance. For vibratory stress measurement, a high-temperature strain gage has been developed which will operate at temperatures up to 1500 F continuously and up to 1800 F for short periods of time. For static stress measurement, a self-temperature -- compensating, high -- temperature strain gage has been developed for application on specific alloys up to 850 F. Developments to increase the temperature range of both of these gages are under way.
Author: P. E. McCarty Publisher: ISBN: Category : Languages : en Pages : 23
Book Description
A noninterference technique for measuring stress in compressor blades of turbine engines is being developed to alleviate disadvantages associated with conventional strain-gage measurement systems. The noninterference technique uses blade-tip deflection measurements and special data-processing algorithms to infer local blade stress. A prototype of the noninterference technique equipped with a nonintegral blade vibration data-processing algorithm has been experimentally validated.
Author: P. E. McCarty Publisher: ISBN: Category : Languages : en Pages : 47
Book Description
A noninterference technique for measuring stress in compressor blades of turbine engines is being developed to alleviate disadvantages associated with conventional strain-gage measurement systems. This technique utilizes blade tip deflection measurements and special data processing algorithms to infer local blade stress. A prototype noninterference processing system for inferring blade stress from a single compressor stage, from blade vibrations nonintegral to engine speed has been developed. Blade stress amplitude and spectral information are displayed on conventional strain-gage-type displays with which the blade stress analyst is intimately familiar. The prototype system has been checked by comparison with existing recorded strain-gage test data sampled to simulate blade tip deflection measurements. (Author).
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Author: W.A. Stange
Author: National Aeronautics and Space Administration (NASA)
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Author: B. R. Anderson
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Author: P. E. McCarty
Author: Patrick T. Chiarito
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Author: P. E. McCarty