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Author :
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (317 download)
Download or read book Research Requirements for Development of Advanced-technology Helicopter Transmissions written by and published by . This book was released on 1976 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John J. Coy
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)
Download or read book Advanced Transmission Studies written by John J. Coy and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Lewis Research Center and the U.S. Army Aviation Systems Command share an interest in advancing the technology for helicopter propulsion systems. In particular, this paper presents highlights from that portion of the program in drive train technology and the related mechanical components. The major goals of the program are to increase life, reliability, and maintainability; reduce the weight, noise, and vibration; and maintain the relatively high mechanical efficiency of the gear train. The current activity emphasizes noise reduction technology and analytical code development followed by experimental verification. Selected significant advances in technology for transmissions are reviewed, including advanced configurations and new analytical tools. Finally, the plan for transmission research in the future is presented.
Author : David G. Lewicki
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (219 download)
Download or read book Effect of Advanced Component Technology on Helicopter Transmissions written by David G. Lewicki and published by . This book was released on 1987* with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raymond J. Drago
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (228 download)
Download or read book A Study of the Potential Benefits Associated with the Development of a Dedicated Helicopter Transmission Lubricant written by Raymond J. Drago and published by . This book was released on 1985 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A common oil is now used in both engines and transmissions of virtually all U.S. military helicopters. While this provides significant logistic advantages, these advantages are attained only by compromising the optimization of the oil for either system. This paper summarizes the results of two studies undertaken to determine what benefits would accrue through the development of a special oil tailored specifically to meet the unique requirements of high-speed, heavily loaded helicopter transmission systems. These studies, conducted independently by two major helicopter manufacturers under the direction of the Naval Air Propulsion Center, addressed specific problem areas as related to typical production aircraft in order to reach well-documented conclusions. In addition, the effect of the availability of such a special gearbox lubricant on the development of other advanced technology components was evaluated and documented.
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781792685514
Total Pages : 34 pages
Book Rating : 4.6/5 (855 download)
Download or read book Effect of Advanced Component Technology on Helicopter Transmissions written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-31 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental tests were performed on the NASA/Bell Helicopter Textron (BHT) 500 hp advanced technology transmission (ATT) at the NASA Lewis Research Center. The ATT was a retrofit of the OH-58C helicopter 236 kW (317 hp) main rotor transmission, upgraded to 373 kW (500 hp), with a design goal of retaining long life with a minimum increase in cost, weight, and size. Vibration, strain, efficiency, deflection, and temperature experiments were performed and the results were compared to previous experiments on the OH-58A, OH-58C, and UH-60A transmissions. The high-contact-ratio gears and the cantilevered-mounted, flexible ring gear of the ATT reduced vibration compared to that of the OH-58C. The ATT flexible ring gear improved planetary load sharing compared to that of the rigid ring gear of the UH-60A transmission. The ATT mechanical efficiency was lower than that of the OH-58A transmission, probably due to the high-contact-ratio planetary gears. Lewicki, David G. and Townsend, Dennis P. Glenn Research Center NASA-TM-101431, E-4531, NAS 1.15:101431, AVSCOM-TR-87-C-38, AD-A219265 RTOP 505-63-51...
Author :
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ISBN 13 :
Total Pages : 1102 pages
Book Rating : 4.X/5 (4 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1973 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (227 download)
Download or read book Effect of Advanced Component Technology on Helicopter Transmissions written by and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental tests were performed on the NASA/Bell Helicopter Textron (BHT) 500-hp advanced technology transmission (ATT) at the NASA Lewis Research Center. The ATT was a retrofit of the OH-58C helicopter 236-kW (317-hp) main rotor transmission, upgraded to 373 kW (500 hp), with a design goal of retaining long life with a minimum increase in cost, weight, and size. Vibration, strain, efficiency, deflection, and temperature experiments were performed and the results were compared to previous experiments on the OH-58A, OH-58C, and UH-60A transmissions. The high-contact-ratio gears and the cantilever-mounted, flexible ring gear of the ATT reduced vibration compared to that of the OH-58C. The ATT flexible ring gear improved planetary load sharing compared to that of the rigid ring gear of the UH-60A transmission. The ATT mechanical efficiency was lower than that of the OH-58A transmission, probably due to the high-contact-ratio planetary gears. Keywords: Transmission; Gears; Bearings; Transmission testing; Efficiency; Vibration; Strain; Deflections; Helicopters; High-contact-ratio gears.
Author :
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ISBN 13 :
Total Pages : 1142 pages
Book Rating : 4.E/5 ( download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 460 pages
Book Rating : 4.:/5 (319 download)
Download or read book Army Research and Development written by and published by . This book was released on 1974 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 548 pages
Book Rating : 4.:/5 (317 download)
Download or read book Advanced Power Transmission Technology written by and published by . This book was released on 1983 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (317 download)
Download or read book Research Requirements to Improve Reliability of Civil Helicopters written by and published by . This book was released on 1978 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. J Willis (Jr)
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (228 download)
Download or read book A State of the Art Assessment of Turboprop Transmission Technology and Projected Needs for the Next Generation written by R. J Willis (Jr) and published by . This book was released on 1985 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The major share of power transmission research and development during the past twenty years has been expended on the improvement of helicopter main rotor drives. Fortunately, most of the advanced technology features resulting from these efforts are directly applicable to turboprop transmissions. The technology base is made up of a number of interacting disciplines whose application is tempered by economics as well as the engineering state of the art at any given time.
Author : United States. Superintendent of Documents
Publisher :
ISBN 13 :
Total Pages : 1250 pages
Book Rating : 4.3/5 (121 download)
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author :
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ISBN 13 :
Total Pages : 1256 pages
Book Rating : 4.:/5 (31 download)
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1979 with total page 1256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (317 download)
Download or read book Research Requirements to Improve Safety of Civil Helicopters written by and published by . This book was released on 1977 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David Blake Stringer
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (495 download)
Download or read book A New Helicopter Transmission Model for Condition-based Maintenance Technologies Using First Principles written by David Blake Stringer and published by . This book was released on 2009 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a new helicopter transmission model in support of condition-based maintenance (CBM) initiatives. The model uses the first principles approach to analyze the rotating shafts and gear couplings using rotor dynamic analysis techniques. The helicopter transmission is presented, followed by a discussion of the finite element formulation to include gear mesh modeling methodologies. System natural frequencies and mode shapes are discussed, along with the model's validation procedure. The model's primary purpose is to simulate multiple operating conditions to include faults. One such fault condition simulates the wear of gear tooth contact surfaces. The nature of the fault and its modeling techniques are discussed. Simulation results are presented in the time domain using a conventional vibration diagnostic parameter. A new diagnostic parameter, the FE2, is also introduced for detecting faults in the frequency domain. Additional considerations and further research points are also discussed. The results demonstrate the potential of physics-based, mathematical models in providing a key technology enabler for improving health monitoring and prediction capabilities of CBM strategies.
Author : United States. Naval Air Systems Command
Publisher :
ISBN 13 :
Total Pages : 672 pages
Book Rating : 4.E/5 ( download)
Download or read book Technical Information Indexes written by United States. Naval Air Systems Command and published by . This book was released on 1974 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
