NASA Langley Scientific and Technical Information Output: 1999 PDF Download
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Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 182
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Book Description
Author:
Publisher:
ISBN:
Category : Astronautics
Languages : en
Pages : 182
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 166
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Book Description
Author:
Publisher:
ISBN:
Category : Automatic control
Languages : en
Pages : 212
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Author:
Publisher: DIANE Publishing
ISBN: 1428925759
Category :
Languages : en
Pages : 66
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 488
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
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Category :
Languages : en
Pages : 28
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Book Description
Wireless telemetry technology for transmitting power and data to and from sensors located inside a gas-turbine engine is reviewed. Two scenarios are considered: a rotating sensor hardwired to a shaft-mounted, inductively-coupled system; and a stationary or rotating microsensor telemetry module. Applications of these telemetry scenarios in the gas-turbine operating environment, the types of sensor measurements, the principles of telemetry, and a review of the current state of microfabricated components for telemetry systems are given. Inductive coupling for both data and power transmission is emphasized in the first scenario. The microsensor telemetry module discussed in the second scenario would need battery power or an alternative power source. These technologies are emerging and do not represent available products. A brief list of alternative technologies for providing power is presented at the end.
Author: C. DellaCorte
Publisher:
ISBN:
Category : Nickel alloys
Languages : en
Pages : 22
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Book Description
The performance and durability of advanced, high temperature foil air bearings are evaluated under a wide range (10-50 kPa) of loads at temperatures from 25 to 650 deg C. The bearings are made from uncoated nickel based superalloy foils. The foil surface experiences sliding contact with the shaft during initial start/stop operation. To reduce friction and wear, the solid lubricant coating, PS 304, is applied to the shaft by plasma spraying. PS304 is a NiCr based Cr2O3 coating with silver and barium fluoride/calcium fluoride solid lubricant additions. The results show that the bearings provide lives well in excess of 30,000 cycles under all of the conditions tested. Several bearings exhibited lives in excess of 100,000 cycles. Wear is a linear function of the bearing load. The excellent performance measured in this study suggests that these bearings and the PS 304 coating are well suited for advanced high temperature, oil-free turbomachinery applications.
Author:
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Category :
Languages : en
Pages : 22
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Book Description
Ten different ceramic matrix composite (CMC) materials were subjected to a constant load and temperature in an air environment. Tests conducted under these conditions are often referred to as stressed oxidation or creep rupture tests. The stressed oxidation tests were conducted at a temperature of 1454 deg C at stresses of 69 MPa, 172 MPa and 50% of each material's ultimate tensile strength. The ten materials included such CMCs as C/SiC, SiC/C, SiC/SiC, SiC/SiNC and C/C. The time to failure results of the stressed oxidation tests will be presented. Much of the discussion regarding material degradation under stressed oxidation conditions will focus on C/SiC composites. Thermogravimetric analysis of the oxidation of fully exposed carbon fiber (T300) and of C/SiC coupons will be presented as well as a model that predicts the oxidation patterns and kinetics of carbon fiber tows oxidizing in a nonreactive matrix.
Author: Ramakrishna T. Bhatt
Publisher:
ISBN:
Category : Additives
Languages : en
Pages : 24
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Book Description
Strong and tough Hi-Nicalon SiC fiber reinforced reaction-bonded silicon nitride matirix composites (SiC/RBSN) have been fabricated by the fiber lay-up approach. Commercially available uncoated and PBN, PBN/Si-rich PBN, and BN/SiC coated SiC Hi-Nicalon fiber tows were used as reinforcement. The composites contained ~24 vol % of aligned 14 ♯m diameter SiC fibers in a porous RBSN matrix. Both one- and two-dimensional composites were characterized. The effects of interface coating composition, and the nitridation enhancing additive, NiO, on the room temperature physical, tensile, and interfacial shear strenght properties of SiC/RBSN matrix composites were evaluated. Results indicate that all three coated fibers, the thickness of the coating decreased from the outer periphery to the interior of the tows, and that from 10 to 30 percent of the fibers were not covered with the interface coating.
