Download or read book Supersonic Transport Noise Reduction Technology Summary Phase 1 Summary of GE4 SST Acoustic Suppression Research written by and published by . This book was released on 1972 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: A development program for a commercial supersonic aircraft and engines was sponsored by the Federal Aviation Administration during a five-year period from 1966 through 1971. The unique propulsion system, an afterburning turbojet, required acoustic suppression techniques to reduce its noise levels to those federally regulated for subsonic aircraft. An acoustic suppression research program was conducted by the General Electric Company to develop technology applicable to prototype and commercial supersonic engines. Primary emphasis was on jet noise suppressor development through model and engine testing. Various systems were studied including ejector pumping, simple mechanical primary and secondary suppressors, fluid injectants, multi-element tube nozzles, acoustically treated ejectors, highly segmented annular plug nozzles, etc. A research study on fundamental jet noise generation and reduction mechanisms was conducted at the General Electric Corporate Research and Development Center. In addition, investigatory tests were conducted for identification of total system noise. Application of a choked inlet and an open A sub 8 exhaust cycle were studied for noise reduction. Source turbomachinery noise generation and suppression through treatment application were investigated. This report summarizes the acoustic and aerodynamic technology with emphasis toward development of guidelines for future applications.

Download or read book Supersonic Transport Noise Reduction Technology Summary Phase I written by W. S. Fisk and published by . This book was released on 1972 with total page 529 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies were performed to conclude and refine elements of work begun under the Supersonic Transport Engine Development Program. Three programs were completed in the area of turbomachinery noise: the screening of proposed materials for high temperature acoustic treatment and the extension of suppression design methods to the flows and temperatures typical of turbine exhaust conditions; investigations of multi-stage compressor tip treatment using multiple circumferential grooves; and the prediction and demonstration of the effects of increased turbine axial spacing on noise generation. Detailed analytical studies were made of data from conic and suppressor-type jets, both cold and hot flows, selected from the GE4/SST program. Correlations of aero/acoustic interrelationships were made, and elements of the noise generation mechanisms showing promise for future advanced concepts were identified. Scaling of small model jet noise data to engine size was established, using scaling techniques and accounting for site differences and the added sources present in engine data. (Author).

Download or read book Supersonic Transport Noise Reduction Technology Summary Phase 1 Summary of GE4 SST Acoustic Suppression Research written by and published by . This book was released on 1972 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Jet Noise Suppressor Configurations and Parametric Studies (Concluded) -- Acoustic ejectors on tube and conical nozzles, and Annular plug nozzle suppressor model studies; System studies -- Choked inlet - GE4 engine, Exhust nozzle open area schedule - GE4 Engine, and Tubomachinery noise on GE4 engine; General Electric Corporate Research and Development Center's Fundamental Jet Noise Work -- Supersonic jet noise suppression results and prediction methods.

Download or read book The Supersonic Transport written by Langley Research Center and published by . This book was released on 1960 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Supersonic Transport Noise Reduction Technology Program Phase II written by S. B. Kazin and published by . This book was released on 1975 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Supersonic Transport Noise Reduction Technology Program, sponsored by the Federal Aviation Administration, was conducted as a follow-on effort after cancellation of the SST Program to finalize selected noise technology areas and summarize results of the SST Program. Using initial effects of the SST Program, as summarized in Phase I of The Supersonic Transport Noise Reduction Technology Program, the Phase II contract was issued to the General Electric Company (and Boeing) to continue this important work. The overall program objective was to provide additional acoustic technology necessary, to design high speed aircraft systems, recognizing future acceptable noise levels. General Electric's effort was divided into the acoustic technology areas of jet noise reduction, turbomachinery noise reduction, and aircraft system integration. Jet noise reduction technology work was achieved through analytical studies, model tests, and J79 engine tests. Selected suppression systems identified during the SST Program were further refined (multispoke/chute suppressors or annular plug nozzles). Novel advanced concepts of suppression were identified, and extensive aerodynamic (static and wind-on) performance tests and hot-jet acoustic tests were performed.

Download or read book Aeroacoustics of Flight Vehicles Noise control written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Notices of Changes in Classification Distribution and Availability written by and published by . This book was released on 1977 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 36th AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit 2000 3150 2000 3199 written by and published by . This book was released on 2000 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Quantitative Assessment of Advanced Take off Trajectories for Supersonic Transport Noise Reduction written by Laurens Jozef Amandine Voet and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis (a) establishes the design trades and limitations of supersonic transport propulsion systems in terms of take-off noise reduction, (b) identifies the attributes, quantifies the potential, and assesses the impact of advanced take-off trajectories designed for noise reduction, and (c) formulates a reduced-order model to scale these results for supersonic transport of different size classes and cruise Mach numbers. The propulsion system design trades established in this thesis show that clean- sheet engines do not enable supersonic transport to meet current subsonic transport noise limits when using conventional take-off trajectories. The impact of derivative engines on the cumulative noise levels is found to be small (1.4 EPNdB). In fact, regardless of whether a clean-sheet or derivative engine is selected, a Mach 1.4 business jet is shown to exceed the current cumulative noise limit by at least 15.5 EPNdB. Further noise reduction of the jet noise dominant engines is prevented by the fan size constraint imposed to limit wave drag during supersonic cruise. Advanced trajectories are proposed to reduce take-off noise by capitalizing on excess engine thrust and improved aerodynamic efficiency at higher take-off speeds. These novel trajectories use (i) automatic continuous control of thrust and high-lift devices, (ii) increased take-off speed, and (iii) reduced cut-back altitude, compared to conventional trajectories currently used for subsonic transport. For the aircraft examined, although these trajectories reduce the 65 dB-A community noise contour area by 63.8%, they only reduce cumulative certification noise by 10.6 EPNdB, which is insufficient to meet current subsonic transport noise limits. Additionally, advanced trajectories with the lowest community noise do not yield the lowest certification noise, which warrants re-examination of supersonic transport noise standards. On the contrary, engine NO[subscript x] standards are representative for supersonic transport using advanced take-off trajectories and thus do not need to be modified, as the impact of these trajectories on the mass of NO[subscript x] emissions during climb-out is small (16.1%). Last, a first-of-its-kind reduced-order model for supersonic transport take-off noise scaling shows that, as cruise Mach number increases, supersonic transport take-off noise levels increase while the thrust cut-back noise reduction potential decreases. This scaling rule enables equally stringent standard setting for noise certification of supersonic transport across a broad range of size classes and cruise Mach numbers.

Download or read book SST Technology Follow On Program Phase I a Summary of the SST Jet Noise Suppression Test Program written by and published by . This book was released on 1972 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supersonic aircraft require propulsion systems that are significantly different from those for present subsonic aircraft. The higher jet velocity of the supersonic aircraft engines will generate more noise during the actual takeoff run than conventional jet transport engines. An applied research program was conducted at The Boeing Company from February 1966 through March 1971 to investigate jet nozzle systems which will suppress jet noise levels from the supersonic transport with minimal thrust loss. These efforts applied to the two prototype supersonic transports being developed at that time as well as the commercial version of the SST that was to follow. The research program indicated that 12 to 20 PNdB noise suppression can be attained with less than 10% thrust loss by using multielement jet nozzle concepts. This report summarizes the test results pertaining to suppressor nozzle noise and thrust characteristics.

Download or read book Supersonic Transport Development Environmental Impact Statement written by United States. Office of Supersonic Transport Development and published by . This book was released on 1970 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Collection of Technical Papers written by and published by . This book was released on with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aviation Noise Impact Management written by Laurent Leylekian and published by Springer. This book was released on 2022-03-15 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book provides a view into the state-of-the-art research on aviation noise and related annoyance. The book will primarily focus on the achievements of the ANIMA project (Aviation Noise Impact Management through Novel Approaches), but not exclusively. The content has a broader theme in order to encompass. regulation issues, the ICAO (International Civil Aviation Organization) balanced approach, progresses made on technologies and reduction of noise at source, impact of possible future civil supersonic aircraft, land-use planning issues, as well as the core topics of the ANIMA project, i.e. impact on human beings, annoyance, quality of life, health and findings of the project in this respect. This book differs from traditional research programmes on aviation noise as the authors endeavour, not to lower noise at source, but to reduce the annoyance. This book examines these non-acoustic factors in an effort to help those most affected by aviation noise – communities living close to airports, and also help airport managers, policy-makers, local authorities and researchers to deal with this issue holistically. The book concludes with some recommendations for EU, national and local policy-makers, airport and aviation authorities, and more broadly a scientifically literate audience. These recommendations may help to identify gaps for progress in terms of research but also genuine implementation actions for political and regulatory authorities.

Download or read book Supersonic Cruise Technology written by F. Edward Mclean and published by . This book was released on 1985 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Commercial Supersonic Technology written by National Research Council and published by National Academies Press. This book was released on 2002-02-16 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-speed flight is a major technological challenge for both commercial and business aviation. As a first step in revitalizing efforts by the National Aeronautics and Space Administration (NASA) to achieve the technology objective of high-speed air travel, NASA requested the National Research Council (NRC) to conduct a study that would identify approaches for achieving breakthroughs in research and technology for commercial supersonic aircraft. Commercial Supersonic Technology documents the results of that effort. This report describes technical areas where ongoing work should be continued and new focused research initiated to enable operational deployment of an environmentally acceptable, economically viable commercial aircraft capable of sustained supersonic flight, including flight over land, at speeds up to approximately Mach 2 in the next 25 years or less.

Download or read book Supersonic Transport Development Program Phase Iii Proposal Boeing Model 2707 Volume Iv 5 Internal Noise Program written by R. H. Sawhill and published by . This book was released on 1966 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: B-2707 Interior Noise Levels; Noise Sources -- Boundary layer noise, Engine noise, Equipment and systems noise, Prediction Methods and Noise Reduction -- Boundary layer noise prediction, Prediction methods for transmission loss, and Noise reduction.