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Category :
Languages : en
Pages : 16
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Author:
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Category :
Languages : en
Pages : 16
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722027810
Category :
Languages : en
Pages : 24
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This paper presents a summary of the transmission diagnostics research work conducted at NASA Lewis Research Center over the last four years. In 1990, the Transmission Health and Usage Monitoring Research Team at NASA Lewis conducted a survey to determine the critical needs of the diagnostics community. Survey results indicated that experimental verification of gear and bearing fault detection methods, improved fault detection in planetary systems, and damage magnitude assessment and prognostics research were all critical to a highly reliable health and usage monitoring system. In response to this, a variety of transmission fault detection methods were applied to experimentally obtained fatigue data. Failure modes of the fatigue data include a variety of gear pitting failures, tooth wear, tooth fracture, and bearing spalling failures. Overall results indicate that, of the gear fault detection techniques, no one method can successfully detect all possible failure modes. The more successful methods need to be integrated into a single more reliable detection technique. A recently developed method, NA4, in addition to being one of the more successful gear fault detection methods, was also found to exhibit damage magnitude estimation capabilities. Zakajsek, James J. Glenn Research Center RTOP 505-62-36...
Author: James J. Zakrajsek
Publisher:
ISBN:
Category : Gearing
Languages : en
Pages : 0
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Author:
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ISBN:
Category :
Languages : en
Pages : 24
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This paper is a review of some of the research work of the NASA Lewis Research Center Mechanical Components Branch. It includes a brief review of the NASA Lewis Research Center and the Mechanical Components Branch. The research topics discussed are crack propagation of gear teeth, gear noise of spiral bevel and other gears, design optimization methods, methods we have investigated for transmission diagnostics, the analytical and experimental study of gear thermal conditions, the analytical and experimental study of split torque systems, the evaluation of several new advanced gear steels and transmission lubricants and the evaluation of various aircraft transmissions. The area of research needs for gearing and transmissions is also discussed.
Author: James J. Zakrajsek
Publisher:
ISBN:
Category : Gearing
Languages : en
Pages : 22
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Author: Dennis P. Townsend
Publisher:
ISBN:
Category : Gearing
Languages : en
Pages : 18
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This paper is a review of some of the research work of the NASA Lewis Research Center Mechanical Components Branch. It includes a brief review of the NASA Lewis Research Center and the Mechanical Components Branch. The research topics discussed are crack propagation of gear teeth, gear noise of spiral bevel and other gears, design optimization methods, methods we have investigated for transmission diagnostics, the analytical and experimental study of gear thermal conditions, the analytical and experimental study of split torque systems, the evaluation of several new advanced gear steels and transmission lubricants and the evaluation of various aircraft transmissions. The area of research needs for gearing and transmissions is also discussed.
Author: D. G. Lewicki
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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The NASA Lewis Research Center and The U.S. Army Aviation Systems Command (AVSCOM) are involved in a joint research program to advance the technology of rotorcraft transmissions. The program consists of analytical and experimental efforts to achieve the overall goals of reducing transmission weight and noise, while increasing life and reliability. The work includes in-house studies and tests, university grants, industry contracts, and joint programs with other military organizations. This paper highlights recent activities in the areas of transmission and related component research. Current areas include specific technologies in support of military rotary wing aviation, gearing technology, transmission noise reduction studies, a recent interest in gearbox diagnostics, and advanced transmission system studies. Results of recent activities are presented along with near term research plans. Keywords: Transmissions, Gears, Noise, Diagnostics. (jhd).
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Category :
Languages : en
Pages : 9
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The NASA Lewis Research Center and the U.S. Army Aviation Systems Command are involved in a joint research program to advance the technology of rotorcraft transmissions. This program consists of analytical as well as experimental efforts to achieve the overall goals of reducing weight, noise, and vibration, while increasing life and reliability. This paper highlights recent analytical activities in the areas of gear noise, vibration, and diagnostics performed in-house and through NASA and U.S. Army sponsored grants and contracts. These activities include studies of gear tooth profiles to reduce transmission error and vibration as well as gear housing and rotordynamic modeling to reduce structural vibration transmission and noise radiation, and basic research into current gear failure diagnostic methodologies. Results of these activities are presented along with an overview of near term research plans in the gear noise, vibration, and diagnostics area. Keyword: Helicopters, Gear noise, Vibration, Diagnostics, Defect analysis, Functional analysis, Weight reduction, Noise reduction, Gear teeth, Profiles, Dynamics, Models, Radiation, Failure mechanics, Methodology, Air Force Research, Lubrication, Materials, Kinematics, Transmission gears, Numerical analysis, Mathematical models, Transmisivity, Acoustics misalignment, Input output models, Deflection, Geometry, Surface, Error, Transmission, Gears. (emk).
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722254858
Category :
Languages : en
Pages : 24
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This report describes the Gearbox Vibration Diagnostic Analyzer installed in the NASA Lewis Research Center's 500 HP Helicopter Transmission Test Stand to monitor gearbox testing. The vibration of the gearbox is analyzed using diagnostic algorithms to calculate a parameter indicating damaged components. Unspecified Center NAS3-26134; RTOP 505-63-36...
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 464
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