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  • Other Sources  (4)
  • 2020-2024
  • 1995-1999
  • 1980-1984  (4)
  • 1982  (4)
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  • 2020-2024
  • 1995-1999
  • 1980-1984  (4)
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  • 1
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    Unknown
    Analysis of the nature and cause of turbulence upset using airline flight records (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The development and application of methods for determining aircraft motions and related winds, using data normally recorded during airline flight operations, are described. The methods are being developed, in cooperation with the National Transportation Safety Board, to aid in the analysis and understanding of circumstances associated with aircraft accidents or incidents. Data from a recent DC-10 encounter with severe, high-altitude turbulence are used to illustrate the methods. The analysis of this encounter shows the turbulence to be a series of equally spaced horizontal swirls known as 'cat's eyes' vortices. The use of flight-data analysis methods to identify this type of turbulence phenomenon is presented for the first time.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis of general-aviation accidents using ATC radar records (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that general aviation aircraft usually do not carry flight recorders, and in accident investigations the only available data may come from the Air Traffic Control (ATC) records. A description is presented of a technique for deriving time-histories of aircraft motions from ATC radar records. The employed procedure involves a smoothing of the raw radar data. The smoothed results, in combination with other available information (meteorological data and aircraft aerodynamic data) are used to derive the expanded set of motion time-histories. Applications of the considered analytical methods are related to different types of aircraft, such as light piston-props, executive jets, and commuter turboprops, as well as different accident situations, such as takeoff, climb-out, icing, and deep stall.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: AIAA PAPER 82-1310 , Atmospheric Flight Mechanics Conference; Aug 09, 1982 - Aug 11, 1982; San Diego, CA
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    A Variational Technique for Smoothing Flight-Test and Accident Data (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The problem of determining aircraft motions along a trajectory is solved using a variational algorithm that generates unmeasured states and forcing functions, and estimates instrument bias and scale-factor errors. The problem is formulated as a nonlinear fixed-interval smoothing problem, and is solved as a sequence or linear two-point boundary value problems, using a sweep method. The algorithm has been implemented for use in flight-test and accident analysis. Aircraft motions are assumed to be governed by a six-degree-of-freedom kinematic model; forcing functions consist of body accelerations and winds, and the measurement model includes aerodynamic and radar data. Examples of the determination of aircraft motions from typical flight-test and accident data are presented.
    Keywords: Aircraft Design, Testing and Performance
    Type: AIAA Paper 80-1601R , Journal of Aircraft; 19; 7; 546-552|Atmospheric Flight Mechanics Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Blade loss transient dynamic analysis of turbomachinery (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper reports on work completed to develop an analytical method for predicting the transient non-linear response of a complete aircraft engine system due to the loss of a fan blade, and to validate the analysis by comparing the results against actual blade loss test data. The solution, which is based on the component element method, accounts for rotor-to-casing rubs, high damping and rapid deceleration rates associated with the blade loss event. A comparison of test results and predicted response show good agreement except for an initial overshoot spike not observed in test. The method is effective for analysis of large systems.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 82-1057 , Joint Propulsion Conference; Jun 21, 1982 - Jun 23, 1982; Cleveland, OH
    Format: text
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    NASA TECHNICAL REPORTS
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