3 edition of Window acoustic study for advanced turboprop aircraft found in the catalog.
Window acoustic study for advanced turboprop aircraft
by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va
Written in English
|Statement||R.A. Prydz, F.J. Balena|
|Series||NASA contractor report -- 172391, NASA contractor report -- NASA CR-172391|
|Contributions||Balena, F. J, Langley Research Center|
|The Physical Object|
Over the years, the interior noise levels have been improved, and nowadays a high acoustical comfort is of major importance for the commercial success of propeller aircraft. The use and development of high vibro-acoustic performance devices and their integration on the primary structure are, therefore, among the most critical topics in the greening of the next generation air by: 6. COMPARATIVE INTERIOR NOISE MEASUREMENTS IN A LARGE TRANSPORT AIRCRAFT – TURBOPROPS VS. TURBOFANS. Jurica Ivošević1, Dubravko Miljković2, Karolina Krajček1. 1 University of Zagreb, Faculty of Transport and Traffic Sciences, Department of Aeronautics. Vukelićeva 4, Zagreb, Croatia, 2HEP Zagreb, Vukovarska 37 [email protected],File Size: KB.
Prop-Fan Propulsion -Its Status and Potential Studies have established that advanced turboprop (prop-fan) equipped aircraft will reduce fuel consumption by 15 to 30 percent compared to aircraft equipped with high-bypass turbofan engines of equivalent by: 8. Interior noise in modern turboprop aircraft is a serious problem as it is directly related to passenger comfort, crew performance, and aircraft weight. For turboprop aircraft the most important noise sources are the propellers generating intense low‐frequency noise which is, in general, difficult to reduce by passive measures. Therefore, extensive work has been conducted on active noise Author: Thomas Rohde, Ingo U. Borchers, Sigurd Häusler, Michael Möser.
Generally, pilots fly turboprop planes using three levers: one for fuel, another for controlling the pitch of the propeller, and a third for power. The ATP uses a full authority digital engine control (FADEC), which enables the reduction from three levers to one, thereby providing a more “jet-like” experience. A Florida company is testing a pound turboprop engine from the Czech Republic on a Van's Aircraft RV Van's Aircraft is not involved in the project. Turbine Solution Group of Deland, Fla., has done ground tests of the aircraft now on display during Sun 'n Fun in Lakeland, Fla. Flight testing will begin after its appearance at the yearly.
Effects of planform geometry on tidal flushing and mixing in marinas
The golden book of Marcus Aurelius.
Electrical load management for the California water system
The felons account of his transportation at Virginia in America.
Railways in the blood
The University prints.
Industrial Noise Control and Acoustics
Estate management in eighteenth-century England
Uses of the Social Security work history sample in studying metropolitan migration
The Nature of Life
New Ibis Readers
Designs for advanced turboprop powered aircraft. The basic approach of the Cockburn and Jolly sound transmission method was used to analyze multipane window configurations. The results of the analysis showed that a triple-pane, high-surface-density window would meet both the acoustic and sidewall space requirements.
However, formatting rules can vary widely between applications and fields of interest or study. The specific requirements or preferences of your reviewing publisher, classroom teacher, institution or. An acoustic analysis was performed to establish window designs for advanced turboprop powered aircraft.
The window transmission loss requirements were based on A-weighted interior noise goals of 80 and 75 dBA. The analytical results showed that a triple pane window consisting of two glass outer panes and an inner pane of acrylic would provide the required transmission loss and meet the Author: R.
Prydz and F. Balena. In this study the transmissibility of triple pane windows, designed to provide 69 dB noise transmission loss at the blade propeller frequency of Hz, was experimentally investigated using insertion loss and three-dimensional intensity techniques.
A modal analysis on the outer window panes was conducted to determine pane modal : Ferdinand W. Grosveld. Full text of "Investigation of fuselage acoustic treatment for a twin-engine turboprop aircraft in flight and laboratory tests" See other formats NASA Technical Memorandum (NASA-TH) INVFSTIGATION OF FL'i)ELAGB ACOUSTIC T FOR A THlN-ENSINfi TURBOPROP AlfiCEAFT IN FLIGHT AND LABORATORY TESTS (NASA) 37 p Hr AC3/HF AO I CSCL 20A G3/71.
Computational Fluid Dynamic (CFD) is used to study a complete twin-engined turboprop aircraft, in particular evaluating the fuselage exterior noise, as well as the interior cabin sound levels via experimentally obtained transfer by: 2. windows for advanced turboprop and jet aircraft.
The work presented in this paper extends the plexiglas window study to include transmission loss predictions based on statistical energy analysis (SEA) methods and TL equations in the literature. ADVANCED AIRCRAFT FLIGHT PERFORMANCE Comprehensive Programs in This Book 13 Bibliography 14 2 Aircraft Models Model for Transport Aircraft 16 Case Study: Turboprop PWM Turbojet with After-Burning Generalised Engine Performance generation by pipe ﬂows, and with respect to more advanced th eory on modal expansions and approx-imation methods.
This particular choice is motivated by industrial applications like aircraft engines and gas transport systems. This course is inspired by the book of Dowling and Ffowcs Williams: “Sound and Sources of Sound” .
A follow-on study was performed to assess the potential of an advanced turboprop transport aircraft concept. To provide a valid basis for compari- son, an equi valent turbofan transport aircraft concept incorporating equal technology levels was also derived.
Recent advances in active noise control. Stevens and Advanced turboprop aircraft noise annoyance - A review of recent NASA research. Broadband active structural acoustic control of aircraft cabin noise - Laboratory tests.
Simpson, Cited by: The aerodynamic design and analysis on advanced propeller with blade sweep was performed for recent turboprop aircraft.
HS1 airfoil series are selected as a advanced propeller blade : Won Choi. An aerodynamic and acoustic study was made of a pusher-propeller aircraft model in the NASA Ames Research Center 7-by Foot Wind Tunnel.
The test sec-tion was modified to operate as an open jet. The mm diameter unswept propeller was operated alone and in the wake of three empennages--an I-tail, a Y-tail, and a Size: 2MB.
A flight and laboratory study of sidewall acoustic treatment for cabin noise control is described. In flight, cabin noise levels were measured at six locations with three treatment configurations. Noise levels from narrow-band analysis are reduced to one-third octave format and used to calculate insertion loss, IL, defined as the reduction of.
an aircraft is subject the fives types of stress—torsion, bending, tension, shear, and compression. Torsional stress in a fuselage is created in several ways. For example, torsional stress is encountered in engine torque on turboprop aircraft. Engine torque tends to rotate the aircraft in the direction opposite to the direction the propeller File Size: 1MB.
Advanced Aircraft Systems, by David Lombardo, provides upgrading pilots with solid guidance on the function and application of new aircraft systems. Although some of the material really doesn't fit the description "advanced" (e.g. - the material included on electricity and electrical systems), it is nonetheless relevant to aircraft operations/5(18).
Join Mindy and me as we fly the Quest Kodiak to the Sun N Fun Aviation Event in Lakeland, FL. Capt Mindy's Instagram Pr. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.
Propeller installation options for a twin-engined turboprop aircraft are evaluated at cruise conditions, aiming to identify the quieter configuration. Computational fluid dynamics is used to investigate the near-field acoustics and transfer functions are employed to estimate the interior cabin noise.
Co-rotating and counter-rotating installation options are by: 2. Advanced turboprop transport aircraft The initial propfan aircraft system studies were performed by Boeing, Douglas, and Lockheed in the NASA funded studies on Reducing the Energy of the Commercial Air Transportation (RECAT) system reported in () Results from these studies are shown in Figs 10 and Cited by: 9.
A laboratory experiment was conducted to compare the annoyance to advanced turboprop aircraft flyover noise with the annoyance to conventional turboprop and jet aircraft flyover noise.
The effects of fundamental frequency and tone‐to‐broadband noise ratio on advanced turboprop annoyance were also examined. A computer synthesis system was used to generate 18 realistic, time Author: David A.
McCurdy.In-flight acoustic measurements on a light twin-engined turboprop airplane. (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: John F Wilby; C D McDaniel; E G Wilby; Langley Research Center.The most comprehensive, current guide to aircraft powerplants.
Fully revised to cover the latest industry advances, Aircraft Powerplants, Eighth Edition, prepares you for certification as an FAA powerplant technician in accordance with the Federal Aviation Regulations (FAR).This authoritative text has been updated to reflectrecent changes in FAR Part /5(28).