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Author : Z. S. Henry
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Preliminary Design and Analysis of an Advanced Rotorcraft Transmission written by Z. S. Henry and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gloria K. Yamauchi
Publisher : BiblioGov
ISBN 13 : 9781289016630
Total Pages : 24 pages
Book Rating : 4.0/5 (166 download)
Download or read book Progress in Conceptual Design and Analysis of Advanced Rotorcraft written by Gloria K. Yamauchi and published by BiblioGov. This book was released on 2013-06 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: This presentation will give information on Multi-Disciplinary Analysis and Technology Development, including it's objectives and how they will be met. In addition, it will also present recent highlights including the Lift-Offset Civil Design and it's study conclusions, as well as, the LCTR2 Propulsion Concept's study conclusions. Recent publications and future publications will also be discussed.
Author : Egbert Torenbeek
Publisher : John Wiley & Sons
ISBN 13 : 1118568095
Total Pages : 412 pages
Book Rating : 4.1/5 (185 download)
Download or read book Advanced Aircraft Design written by Egbert Torenbeek and published by John Wiley & Sons. This book was released on 2013-05-28 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the overall appearance of modern airliners has not changed a lot since the introduction of jetliners in the 1950s, their safety, efficiency and environmental friendliness have improved considerably. Main contributors to this have been gas turbine engine technology, advanced materials, computational aerodynamics, advanced structural analysis and on-board systems. Since aircraft design became a highly multidisciplinary activity, the development of multidisciplinary optimization (MDO) has become a popular new discipline. Despite this, the application of MDO during the conceptual design phase is not yet widespread. Advanced Aircraft Design: Conceptual Design, Analysis and Optimization of Subsonic Civil Airplanes presents a quasi-analytical optimization approach based on a concise set of sizing equations. Objectives are aerodynamic efficiency, mission fuel, empty weight and maximum takeoff weight. Independent design variables studied include design cruise altitude, wing area and span and thrust or power loading. Principal features of integrated concepts such as the blended wing and body and highly non-planar wings are also covered. The quasi-analytical approach enables designers to compare the results of high-fidelity MDO optimization with lower-fidelity methods which need far less computational effort. Another advantage to this approach is that it can provide answers to “what if” questions rapidly and with little computational cost. Key features: Presents a new fundamental vision on conceptual airplane design optimization Provides an overview of advanced technologies for propulsion and reducing aerodynamic drag Offers insight into the derivation of design sensitivity information Emphasizes design based on first principles Considers pros and cons of innovative configurations Reconsiders optimum cruise performance at transonic Mach numbers Advanced Aircraft Design: Conceptual Design, Analysis and Optimization of Subsonic Civil Airplanes advances understanding of the initial optimization of civil airplanes and is a must-have reference for aerospace engineering students, applied researchers, aircraft design engineers and analysts.
Author :
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (317 download)
Download or read book Preliminary Investigation of the Thermal Behavior of High-Speed Helical Gear Trains written by and published by . This book was released on 2002 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A preliminary experimental investigation of the thermal behavior of high-speed helical gears will be presented. A full-scale torque regenerative test stand has been built to test a representative helical gear train as that used in tiltrotor aircraft. Power loss and temperature data from a wide range of operating conditions were measured. Loop power ranged up to 3730 kW (5000 hp). Drive system components representative of flight quality hardware were used in the test program. The results attained in this initial study indicated that windage losses due to the high rotational speeds that were tested were far more important than the losses due to the gear meshing losses.
Author :
Publisher :
ISBN 13 :
Total Pages : 430 pages
Book Rating : 4.0/5 ( download)
Download or read book AIAA/SAE/ASME/ASEE 27th Joint Propulsion Conference: 91-2018 - 91-2092 written by and published by . This book was released on 1991 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 538 pages
Book Rating : 4.3/5 (91 download)
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781724373762
Total Pages : 212 pages
Book Rating : 4.3/5 (737 download)
Download or read book Sikorsky Aircraft Advanced Rotorcraft Transmission (Art) Program written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-27 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the Advanced Rotorcraft Transmission program were to achieve a 25 percent weight reduction, a 10 dB noise reduction, and a 5,000 hour mean time between removals (MTBR). A three engine Army Cargo Aircraft (ACA) of 85,000 pounds gross weight was used as the baseline. Preliminary designs were conducted of split path and split torque transmissions to evaluate weight, reliability, and noise. A split path gearbox was determined to be 23 percent lighter, greater than 10 dB quieter, and almost four times more reliable than the baseline two stage planetary design. Detail design studies were conducted of the chosen split path configuration, and drawings were produced of a 1/2 size gearbox consisting of a single engine path of the split path section. Fabrication and testing was then conducted on the 1/2 size gearbox. The 1/2 size gearbox testing proved that the concept of the split path gearbox with high reduction ratio double helical output gear was sound. The improvements were attributed to extensive use of composites, spring clutches, advanced high hot hardness gear steels, the split path configuration itself, high reduction ratio, double helical gearing on the output stage, elastomeric load sharing devices, and elimination of accessory drives. Kish, Jules G. Unspecified Center NASA-CR-191079, NAS 1.26:191079, ARL-CR-49, AD-A266406 NAS3-25423; DA PROJ. 1L1-62211-A-47-A; RTOP 505-62-10...
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 :
Publisher :
ISBN 13 :
Total Pages : 414 pages
Book Rating : 4.0/5 ( download)
Download or read book 92-3365 - 92-3399 written by and published by . This book was released on 1992 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert C. Bill
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (227 download)
Download or read book Advanced Rotorcraft Transmission Program written by Robert C. Bill and published by . This book was released on 1990 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: This ART program is a joint Army/NASA program to develop and demonstrate lightweight, quiet, durable drivetrain systems for next generation rotorcraft. ART addresses the drivetrain requirements of two distinct next generation aircraft classes: (1) Future air attack vehicle, a 10,000 to 20,000 lb aircraft capable of undertaking tactical support and air-to-air missions; (2) Advanced cargo aircraft, a 60,000 to 80,000 lb aircraft capable of heavy lift field support operations. Both tiltrotor and more conventional helicopter configurations are included in the ART program. Specific objectives include: reduction of drivetrain weight by 25% compared to baseline state-of-the-art drive systems configured and sized for the next generation aircraft; reduction of noise level at the transmission source by 10dB relative to a suitably sized and configured baseline; and attainment of at least a 5000 hr mean-time-between- removal. The technical approach for achieving ART goals includes application of the latest available component, material, and lubrication technology to advanced concept drivetrains that use new ideas in gear configuration, transmission layout, and airframe/drivetrain integration. To date, candidate drivetrain systems have been carried to a conceptual design stage, and tradeoff studies have resulted in selection of an ART transmission configuration for each of the four contractors. The final section was based on comparative weight, noise, and reliability studies. A description of each of the selected ART designs is included in this paper.
Author : Jules G. Kish
Publisher :
ISBN 13 :
Total Pages : 209 pages
Book Rating : 4.:/5 (227 download)
Download or read book Sikorsky Aircraft Advanced Rotorcraft Transmission (ART) Program - Final Report written by Jules G. Kish and published by . This book was released on 1993 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the Advanced Rotorcraft Transmission program were to achieve a 25% weight reduction, a 10 dB noise reduction, and a 5,000 hour mean time between removals (MTBR). A three engine Army Cargo Aircraft (ACA) of 85,000 pound gross weight was used as the baseline. Preliminary designs were conducted of split path and split torque transmissions to evaluate weight, reliability, and noise. A split path gearbox was determined to be 23% lighter, greater than 10 dB quieter, and almost four times more reliable than the baseline two stage planetary design. Detail design studies were conducted of the chosen split path configuration and drawings were produced of a 1/2 size gearbox consisting of a single engine path of the split path section. Fabrication and testing was then conducted on the 1/2 size gearbox. The 1/2 size gearbox testing proved that the concept of the split path gearbox with high reduction ratio double helical output gear was sound. The improvements were attributed to extensive use of composites, spring clutches, advanced high hot hardness gear steels, the split path configuration itself, high reduction ratio, double helical gearing on the output stage, elastomeric load sharing devices, and elimination of accessory drives ... Transmissions, Gears, Bearings, Helicopters.
Author :
Publisher :
ISBN 13 :
Total Pages : 424 pages
Book Rating : 4.0/5 ( download)
Download or read book AIAA/SAE/ASME/ASEE 27th Joint Propulsion Conference: 91-1900 - 91-1959 written by and published by . This book was released on 1991 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 360 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA SP. written by and published by . This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 570 pages
Book Rating : 4.:/5 (227 download)
Download or read book Advanced Rotorcraft Transmission Program (ART). written by and published by . This book was released on 1995 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effort undertaken by Boeing Defense & Space Group, Helicopters Division, to conduct the Advanced Rotorcraft Transmission (A.R.T.) program is summarized in this report. This program was structured to incorporate key emerging material and component technologies into an advanced rotorcraft transmission with the intent of making significant improvements in the state of the art The specific objectives of this program are 25 percent reduction in weight, lO-dB reduction in noise, and a 5,000 hour MTBR rotorcraft transmission. All of these objectives were attained. Boeing concentrated its work on high-gain and comparatively high risk technologies that could demonstrate the program objectives before full scale aircraft development Component development testing was conducted to evaluate high risk concepts before finalizing the advanced transmission configuration. Some of the advanced technology component tests conducted included hybrid bearings, bidirectional tapered roller bearings, precision net forged gears, active noise cancellation, titanium gears, HCRNIV tooth form spur gears, and noise reduction by variations in contact ratio and tooth form. The results of these tests are provided in this report. Trade studies conducted under this contract indicated that applying the A.R.T. drive system to a new aircraft design will have a great impact on aircraft gross weight and engine power rating requirements, in addition to a significant effect on the acquisition and operating costs of the aircraf. Potential cost savings of more than $300 million on a production run of 600 TTR aircraft or approximately half a million dollars cost reduction per aircraft could be realized.
Author :
Publisher :
ISBN 13 :
Total Pages : 694 pages
Book Rating : 4.0/5 ( download)
Download or read book 93-2120 - 93-2167 written by and published by . This book was released on 1992 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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
