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Wednesday, May 13, 2020 | History

3 edition of System life and reliability modeling for helicopter transmissions found in the catalog.

System life and reliability modeling for helicopter transmissions

M. Savage

System life and reliability modeling for helicopter transmissions

by M. Savage

  • 359 Want to read
  • 26 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Informationc Service in [Washington, D.C.], Springfield, Va .
Written in English

    Subjects:
  • Computer programs.,
  • Mathematical models.,
  • Gears -- Reliability -- Computer programs.,
  • Helicopters -- Transmissions -- Reliability,
  • Transmissions (Mechanical) -- Reliability -- Computer programs.,
  • Computerized simulation.,
  • Helicopter design.,
  • Life (Durability),
  • Reliability.,
  • System effectiveness.,
  • Transmissions (Machine elements)

  • Edition Notes

    StatementM. Savage and C. K. Brikmanis.
    SeriesNASA contractor report -- 3967., NASA contractor report -- NASA CR-3967.
    ContributionsBrikmanis, C. K., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., Lewis Research Center.
    The Physical Object
    FormatMicroform
    Paginationiv, 197 p.
    Number of Pages197
    ID Numbers
    Open LibraryOL16116409M

    Stringer, David B., and Allaire, Paul E. "Modeling Techniques for Dynamic Analysis of a Helicopter Transmission System." Proceedings of the ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. Abstract: Development of a reliable high-performance helicopter-based unmanned aerial vehicle (UAV) requires an accurate and practical model of the vehicle dynamics. This report describes the process and results of the dynamic modeling of a model-scale unmanned helicopter (Yamaha R with 10 ft rotor diameter) using system identification.

      At some point, the industry even thought some helicopters (the Eurocopter EC) had a reliable backup system in case the primary system for gearbox lubrication failed. .   Helicopter transmission overhaul Features - MRO for overhaul and recertification of OH Kiowa helicopter transmissions provided a perfect opportunity. There was only one caveat: a very condensed timeframe. While the system was designed for vertical operation the brake was mounted horizontally to allow direct torque measurement.

      WAYNE, Pa(BUSINESS WIRE)--Jul. 28, Triumph Group, Inc. (NYSE:TGI) today announced that its gear systems operations, located in Park City, Utah and Macomb, Michigan, have been awarded a multi-year supply agreement by Bell Helicopter to provide the main transmission assembly for the scope of the agreement includes manufacturing, . A helicopter transmission with split-torque drive trains to the main rotor and tail rotor drive shaft is described. A design based on two kW engines supplying torque to a r/min main shaft demonstrates a weight reduction of 40 per cent, extreme low height and reduced losses.


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System life and reliability modeling for helicopter transmissions by M. Savage Download PDF EPUB FB2

System Life and Reliability Modeling for Helicopter Transmissions M. Savage and C. Brikmanis University of Akron Akron, Ohio Prepared for Lewis Research Center under Grant NAG NI\5/\ National Aeronautics and Space Administration Scientific and Technical Information Branch System life and reliability modeling for helicopter transmissions.

[Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; Springfield, Va.: For sale by the National Technical Informationc Service, (OCoLC) Material Type.

System life and reliability modeling for helicopter transmissions. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch, April (OCoLC) helicopter transmissions relies in our large expertise in highly-loaded and high-speed aircraft gearboxes.

PERFORMANCE AND RELIABILITY HELICOPTER TRANSMISSIONS TRANSFER GEARBOX Hispano-Suiza is responsible for the design, manufacture, testing and support of several aircraft power transmissions, which includes transfer gearbox (TGB) subsystems.

Astridge, D. Improving the integrity, life, and reliability of helicopter gearboxes. Seminar on Pushing back the frontiers of failure in aerospace transmissions, London, Decemberpaper 5 (Institution of Mechanical Engineers).

Google ScholarCited by: Rashid et al. [6] applied the influence diagram to establish the reliability model for a helicopter main gearbox lubrication system. The working situation of the products with high reliability.

[1]) to evaluate fatigue reliability of helicopter dynamic components. This analytical approach required selection of a reference S/N curve for damage evaluation. Overall reliability of a given life was based on the assumption of weighted sums of the equivalent damage rates of all steps in the load spectrum.

A sensitivity study indicated that the. The interrelationships between MGB lubrication system failure types were thus identified, and the influence of each of these factors on the overall MGB lubrication system reliability was assessed.

This paper highlights parts of the HELMGOP project, sponsored by the European Aviation Safety Agency to improve helicopter main gearbox reliability.

liability and life are discussed. INTRODUCTION With the advent of the gas turbine enqine and its application to helicopters ir" the late fifties and early sixties, there was a significant change in the design ann technology of helicopter transmissions.

Drive system input speeds increased fror to 20, rpm and power to be absorbed tripled. In simple terms, the engine or engines drive the main transmission, and the main transmission drives both the main and tail rotors. There's a more detailed explanation, along with good, clear illustrations, at this FAA Web site: Activities, Cours.

A joint helicopter transmission research program between NASA Lewis Research Center and the U.S. Army Aviation Systems Command has existed since Program goals are to reduce weight and noise and to increase life and reliability.

This report reviews significant advavces in technology for gears. Thirdly, the book deals with many things that you will not normally find in a text book: helicopter related experiences and a great deal of interesting detail.

This is the sort of information that can only be provided if you have flown a lot of different helicopters and have been working in this industry for some time. State-of-the-art technologies The state-of-the-art technologies offered by Safran Transmission Systems for mechanical power transmissions have allowed us to expand our scope of expertise and develop new applications for helicopters.

The design of these helicopter transmissions relies in large part on our expertise in highly-loaded and high-speed geartrains. In a conventional airplane, the engine and propeller are permanently connected.

However, in a helicopter there is a different relationship between the engine and the rotor. Because of the greater weight of a rotor in relation to the power of the engine, as compared. The component-life algorithm will accumulate life and reliability tables.

The Phase I effort developed the algorithms. In the Phase II effort, the life-use monitor algorithm will be placed in its appropriate hardware and flown in a commercial helicopter to provide an improvement in that aircraft's safety.

study of helicopter transmission system development testing sikorsky engineering report ser ojune u. army aviation systems command st. louis, missouri contract daajc(c) sikorsky aircraft division of united aircraft corporation ar 0 distrbutio of earinghouse b this document | for.

the first stage. The planetary gear system contains 99 teeth on the ring gear, 27 teeth on the sun gear and 35 teeth on the planet gears. This helicopter model contains four planet gears in two pairs of two gears; each gear pair is spaced deg with about deg between the pairs. The planet carrier section of the epicyclic system.

Life and Reliability Models for Helicopter Transmissions AHS−RWP−16 (NASA TM−), NASA/TM— 10 23 Reliability Model for Planetary Gear Trains   "It is a very practical book which provides a comprehensive discussion on reliability engineering concepts and techniques throughout a product life cycle.

The author has done a great job in explaining the up-to-date reliability techniques in a very practical manner and using simple and straightforward language.

A recent study on a split torque helicopter transmission is that 22nd compound gear of D. Hochmann et al. They analyzed the load distribution 1,2 1st, 2of spur and double helical gear pairs used in a split torque helicopter lh,2h 1st, 2nd helical gear transmission.

As such, mechanical contact transmissions are vulnerable to loss of lubrication events and require regular maintenance for the lubrication US Army desires a solution to reduce mechanical contacts within the helicopter transmission to alleviate the lubrication loss related catastrophic failures.Discover the best Helicopter Model Kits in Best Sellers.

Find the top most popular items in Amazon Toys & Games Best Sellers.Rotor mast-- Also known as the rotor shaft, the mast connects the transmission to the rotor mast rotates the upper swash plate and the blades.

Transmission -- Just as it does in a motor vehicle, a helicopter's transmission transmits power from the engine to the main and tail transmission's main gearbox steps down the speed of the main rotor so it doesn't rotate as.