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Sunday, November 15, 2020 | History

2 edition of Stereo-video data reduction of wake vortices and trailing aircrafts found in the catalog.

Stereo-video data reduction of wake vortices and trailing aircrafts

Rachel Alter-Gartenberg

Stereo-video data reduction of wake vortices and trailing aircrafts

  • 336 Want to read
  • 28 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, Available from National Technical Information Service in Hampton, Va, Springfield, Va .
Written in English

    Subjects:
  • Image processing.,
  • Photography, Stereoscopic.,
  • Video recording.,
  • Vortex-motion.

  • Edition Notes

    Other titlesStereo video data reduction of wake vortices and trailing aircrafts
    StatementRachel Alter-Gartenberg.
    SeriesNASA CR -- 1998-208719, NASA contractor report -- NASA CR-1998-208719.
    ContributionsComputer Sciences Corporation., Langley Research Center.
    Classifications
    LC ClassificationsTL521.3.C3 A6 no.1998-208719
    The Physical Object
    Paginationiii, 36 p. :
    Number of Pages36
    ID Numbers
    Open LibraryOL19255074M

    Aircraft Wake Vortices Publications “Computational Analysis of a Passive Wake Alleviation Scheme”, Gregory J. McCauley, Philip S. Marcus, Omer Savas, Donald A. Durston, American Institute of Aeronautics and Astronautics, June , doi: /   Aircraft produce wake vortices when they fly, much like two small horizontal tornadoes trailing behind the wing tips. Larger, heavier aircraft produce stronger wakes. the fall of Controlled experiments using a NASA C aircraft are discussed, and some preliminary results are presented. (Keywords: Bistatic radar, Radio-acoustic sounding, Wake vortex.) INTRODUCTION The lifting surfaces of all aircraft produce wake vortices to some extent. The vortex created by a large aircraft such as a can have a.


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Stereo-video data reduction of wake vortices and trailing aircrafts by Rachel Alter-Gartenberg Download PDF EPUB FB2

Limited and well defined set of object points. Tile stereo data reduction scheme employed for tile wake-vortex experiment is oil the matching of the trailing airplane's nose, tail and wing-tips, and their corresponding nearest wake vortices locations (i.e., Figures 5 and 6 top, and Figure 9).

Stereo-video data reduction of wake vortices and trailing aircrafts book September NASA/CR Stereo-Video Data Reduction of Wake Vortices and Trailing Aircrafts Rachel Alter-Gartenberg Computer Sciences Corporation, Hampton, Virginia. Get this from a library. Stereo-video data reduction of wake vortices and trailing aircrafts.

[Rachel Alter-Gartenberg; Langley Research Center.]. A Rockwell OVA airplane, fitted with video cameras under its wings, flew at to feet above and parallel to the wakes, and photographed the wake interception process for the purpose of determining the three-dimensional location of the trailing aircraft relative to the wake.

Stereo-Video Data Reduction of Wake Vortices and Trailing Aircrafts. By Rachel Alter-Gartenberg. Abstract. C was equipped with wing-tip smokers to visualize its wing vortices, while a trailing Boeing flew into the wake vortices of the leading airplane. A Rockwell OVA airplane, fitted with video cameras under its wings, flew at Author: Rachel Alter-Gartenberg.

Aircraft trailing vortices constitute both a kaleidoscope of instructive fluid dynamics phenomena and a challenge for the sustained development of the safety and capacity of the air-transportation Aircraft Wake Vortices: From Fundamental Research to Operational Application | Cited by: 1.

Effects of Wake Vortices on Commercial Aircraft T. Economon + University of Notre Dame, Notre Dame, Indiana, Commercial aircraft are becoming more and more susceptible to wake vortex encounters at cruise altitude. Every airplane generates a trailing vortex which can linger behind the aircraft for Size: 1MB.

Check out the awesome sound of the wake vortexes from a Boeing at Skiathos. Vortexes / Vortices / Wake Turbulence follow the aircraft. Aircraft trailing vortices constitute both a kaleidoscope of instructive fluid dynamics phenomena and a challenge for the sustained development of the safety and capacity of the air-transportation.

Commercial Aircraft Wake Vortices. and the proper evaluation of wake data from measurement and simulation, are addressed in the first part. trailing edge of the wing a strong downward.

The combination of increasing airport congestion and the ad­ vent of large transports has caused increased interest in aircraft wake turbulence.

A quantitative understanding of the interaction between an aircraft and the vortex wake of a preceding aircraft is necessary for planning future high. Abstract. The studies summarized here were motivated by the need to gain information (i) about the impact of aircraft emissions upon the atmosphere and the climate and (ii) about optimized separation distances between aircraft landing at an airport for possibly increasing its : Thomas Gerz, Frank Holzäpfel, Thomas Hofbauer, Andreas Dörnbrack, Michael Frech.

In case of cross winds, wake vortices will be transported out of the way of the oncoming traffic and thus will not represent any more danger. In addition, wake vortices decay will be quicker with high atmospheric turbulence. Theoretical analyses show that decay time of wake vortices is proportional to the cubic root of eddy dissipation rate.

Characterization of Aircraft Dynamic Wake Vortices and Atmospheric Turbulence by Coherent Doppler Lidar Songhua Wu (a, b)*, Xiaochun Zhai (a), Bingyi Liu (a, b) (a) Ocean Remote Sensing Institute, College of Information Science and Engineering, Ocean University of China, QingdaoChina.

• The aircraft crossing one of the gates generates a pair of wake vortices (WV) that are transported (also by the headwind) and also decay. The Deterministic wake Vortex Model (DVM) • The DVM forecasts, in real-time, the WV behavior (transport and decay) in one computational gate, using simplified physical models.

AbstractAircraft trailing vortices pose a danger to following aircraft during takeoff and landing. This necessitates spacing rules, based on aircraft type, to be enforced during approach in instrum Cited by: 2.

Wake Vortex Turbulence; ICAO Wake Turbulence Category; Further Reading. ICAO. ICAO Doc Air Traffic Services Planning Manual, Part II, Section 5 gives detailed characteristics of wake vortices and their effect on aircraft.

ICAO Doc Aircraft Type Designators lists the wake turbulence category for each fixed wing aircraft type. A theory is presented on the effect of wake turbulence of a leading aircraft on the roll stability of a following aircraft, leading to a simple formula for the safe separation distance between the two aircraft that provides estimates of aircraft separation distances comparable to existing empirical regulations, based on by: 2.

The computed vortex circulation is compared with aircraft measurements. As a result it can be seen that the new transient hybrid approach provides physically reasonable results.

The landing gears have a notable effect on the aircraft’s drag, as well as on the wake footprint. However, the effect on the wake vortex circulation evolution is Cited by: 2. A method is presented for comparison of measurements on aircraft wake vortices obtained using two very different techniques: 1) five-hole probe measurements on a 1/ (%) scale half-model of an Airbus A were made in a wind tunnel, and 2) coherent laser radar (lidar) measurements were made in full-scale field trials at Toulouse Blagnac by:   This report provides an extensive analysis of potential wake vortex noise sourcesthat might be utilized to aid in their tracking.

Several possible mechanisms of aircraftvortex sound generation are examined on the basis of discrete vortex dynamic modelsand characteristic acoustic signatures calculated by application of vortex sound : Volpe National Transportation Systems Center.

On wake vortex response for all combinations of five classes of aircraft - Volume Issue - L. Campos, J. Marques Please note, due to essential maintenance online purchasing will be unavailable between and (GMT) on 23rd November Cited by: 4. The frequency of aircraft encountering the wake of other aircraft is analyzed for given aircraft, movement, and meteorological data.

The method considers the descent and decay of wake vortices for a given stratification and turbulence-kinetic-energy dissipation rate, and the advection with ambient horizontal and vertical by: 7. The magnitude of the problem is illustrated by noting that the wake vortices trailing from a B can induce a rolling moment on a Lear Jet type following aircraft about equal to C l v = at 1–2 n mile behind the generating aircraft.

Hence, an accommodation of some Cited by: This paper discusses the problem of wake vortices shed by commercial aircraft. It presents a consolidated European view on the current status of knowledge of the nature and characteristics of aircraft wakes and of technical and operational procedures of minimizing and predicting the vortex strength and avoiding wake encounters.

Methodological aspects of data evaluation and interpretation, Cited by: Block diagram of aircraft wake vortices calculation algorithm is presented in Figure 3. Fig. Block diagram of aircraft wake vortices calculation algorithm. Math model of near wake is constructed on the base of vortex method. Far wake math model is filled with initial data from near wake model through reference plane (RP).File Size: KB.

Aircraft wake vortices – prediction and mitigation Frank Holzapfel¨ ∗, Thomas Gerz, and Robert Baumann Institut f¨ur Physik der Atmosph¨are, DLR Oberpfaffenhofen, D Weßling, Germany.

The current abstract presents selected topics investigated within the wake-vortex research program of DLR. Two approaches. Rachel Alter-Gartenberg, Stereo-Video Data Reduction of Wake Vortices and Trailing Aircrafts, NASA/CR, Septemberpp.

42, (KB) - Pages: NASAcrpdfRead; NASAcrpdfNASAcrpdf. The state of knowledge about aircraft wake vortices in the summer of is summarized. With the advent of a new FAA wake vortex program, the current situation was assessed by answering five questions: (1) What do we know about wake vortices, (2) what don't we know about wake vortices, (3) what are the requirements and limitations for operational systems to solve the wake vortex problems, Cited by: trailing aircraft positioned properly within the upwash field of the lead aircraft’s wake.

The reduction in induced drag arising from flying aircraft in formation is, to first order, attributed to the rotation of the resultant forcevectorarising from the presence of the upwash field associated with the lead aircraft’s wake [1,2]. As depicted inCited by: Wake turbulence from the generating aircraft can affect encountering aircraft due to the strength, duration, and direction of the vortices.

Wake turbulence can impose rolling moments exceeding the roll-control authority of encountering aircraft, causing possible injury to occupants and damage to aircraft. Stereo-Video Data Reduction of Wake Vortices and Trailing Aircrafts C / B Wake Encounter Data Seperation B Flaps C Speed Flight Run Number of Dynamic Encounters Dyn.

Enc. with Stereo Video Wake Dynamics Vortex Marked 3 15 Number of Steady Encounters 2. wake. The near-wake region extends about wingspans behind the generating aircraft and is dominated by the roll-up of multiple vortices off the wing surface, flaps, and tail.

At greater distances, i.e., in the far-wake region, these multiple vortices coalesce into a counter-rotating vortex pair and the ambient meteorologicalFile Size: KB.

SIMULATION OF AIRCRAFT WAKE VORTICES DURING LANDING WITH DECAY ENHANCING OBSTACLES A. Stephan, F. Holz apfel, T. Misaka A reduction of the established static aircraft separation distances appears feasible employing advanced wake-vortex advisory sys-tems (WVAS) incorporating the state-of-the- File Size: 1MB.

Sound recorded by the author in March at JFK International Airport shows that wake vortices in ground effect emit infrasound that is 1) more than 40 dB stronger than audible wake vortex sound; 2) substantially stronger than the infrasound component of wind noise and airport noise; and 3) comparable to, and often stronger than, the infrasound component of aircraft by: 2.

Get this from a library. Aircraft wake vortices: a state-of-the-art review of the United States R & D program. [J N Hallock; W R Eberle; United States. Federal Aviation Administration.

Systems Research and Development Service.;]. The influence of weather is not factored into the wake separation standard, only the weight class of the leading and following aircraft.” Weather can have a significant impact on vortices.

For instance, a strong crosswind can blow a vortex away from the path of a trailing aircraft. Normal turbulence can eat up a Author: Joe Atkinson.

I guess the wake created by a bird is not the same as that of an aircraft, since the flying mechanisms are different. I am inclined to think that the wake behind a bird is more of the form of pressure waves in the air (due to fluttering of wings). Analysis of Wake Vortices of a Medium Range Trailing Vortices and Downwash 38 Propeller analysis 40 ICAO Aircraft Separation Distances to Avoid Wake Vortex Encounter 5 Overall Specifications ofMedium Range Twin-Engine Military Cargo Aircraft and the Model 48Author: Burhan Sahin.

Behavior of wake vortices is widely shown to be altered by proximity to the ground. 5­7. as well as by various. atmosphericconditions. 8,9. numerical simulation by Corjon and Poinsot finds. that ground proximity and resulting viscous flow produce a secondary pair of vortices that induce the original wake vortices to move upward.

: Abstract Aircraft trailing vortices constitute both a kaleidoscope of instructive fluid dynamics phenomena and a challenge for the sustained development of the safety and capacity of the air-transportation system.

proceeding with a sketch of the nature and characteristics of wake vortices resulting from field.realized by the trailing aircraft. This method of drag reduction is contingent upon having the trailing aircraft positioned properly within the upwash- eld of the lead aircraft’s wake. The reduction in induced drag arising from ying aircraft in formation is, to rst order, attributed to the rotation of the resultant.The Complete Handbook on Piloting and Aeronautics.

Home WHAT'S IN THE BOOK. INCIDENTS & ACCIDENTS Chapter Wake Vortices RUNWAY INCIDENTS. Planes featured in the book. sample pages. DIAGRAMS.

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