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  • METEOROLOGY AND CLIMATOLOGY  (3)
  • SPACE SCIENCES  (2)
  • METEOROLOGY  (1)
  • 1
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    Statistical analysis of flight times for space shuttle ferry flights (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Markov chain and Monte Carlo analysis techniques are applied to the simulated Space Shuttle Orbiter Ferry flights to obtain statistical distributions of flight time duration between Edwards Air Force Base and Kennedy Space Center. The two methods are compared, and are found to be in excellent agreement. The flights are subjected to certain operational and meteorological requirements, or constraints, which cause eastbound and westbound trips to yield different results. Persistence of events theory is applied to the occurrence of inclement conditions to find their effect upon the statistical flight time distribution. In a sensitivity test, some of the constraints are varied to observe the corresponding changes in the results.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-129021
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Stochastic simulation of vertically nonhomogeneous gusts (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The small-scale horizontal gust structure of detailed wind profiles along the vertical in the first 20 km of the atmosphere is a vertically nonhomogeneous process. A linear stochastic model was developed based on the process covariance function. This model was formulated through the use of a scaling hypothesis which transforms the nonhomogeneous gust process into a nondimensional gust process which is homogeneous in a nondimensional gust height coordinate. The velocity scaling parameter for the gust process is the gust standard deviation, and the length scale used to nondimensionalize the altitude is the vertical space lag associated with the first zero of the gust covariance function. State space theory was used to derive a digital filter from the model, which can be readily used to simulate gusts for space vehicle design applications.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-X-73004
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Application of Markov chain theory to ASTP natural environment launch criteria at Kennedy Space Center (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: To aid the planning of the Apollo Soyuz Test Program (ASTP), certain natural environment statistical relationships are presented, based on Markov theory and empirical counts. The practical results are in terms of conditional probability of favorable and unfavorable launch conditions at Kennedy Space Center (KSC). They are based upon 15 years of recorded weather data which are analyzed under a set of natural environmental launch constraints. Three specific forecasting problems were treated: (1) the length of record of past weather which is useful to a prediction; (2) the effect of persistence in runs of favorable and unfavorable conditions; and (3) the forecasting of future weather in probabilistic terms.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-129044
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Three velocity component, nonhomogeneous atmospheric boundary layer turbulence modeling (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The vertical nonhomogeneous character of turbulence in the atmospheric boundary layer results in a non-stationary turbulence process relative to an aircraft during takeoff and landing despite the fact that the turbulence statistics can be horizontally homogeneous. The simulation of the three components of the turbulent winds which include the nonstationary aspect of atmospheric turbulence is the subject of this paper. A procedure is developed and demonstrated to generate the three components of a turbulence ramdom process field, u sub i(x,z) where x and z denote horizontal and vertical coordinates and u sub i, i = 1,2,3 are the three orthogonal components of the turbulent random field. This field satisfies any desired one point auto spectra as well as two point statistics (interlevel correlations). By use of Taylors frozen eddy hypothesis we can transform the turbulent random field into the time domain and obtain the random turbulence along an aircraft trajectory.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: AIAA PAPER 76-413 , Fluid and Plasma Dynamics Conference; Jul 14, 1976 - Jul 16, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Stochastic simulation of vertically nonhomogeneous gusts (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The small-scale horizontal gust structure of detailed wind profiles along the vertical in the first 20 km of the atmosphere is a vertically nonhomogeneous process. A linear stochastic model is developed for the process based on the process covariance function. This model is formulated through the use of a scaling hypothesis that transforms the nonhomogeneous gust process into a nondimensional gust process which is homogeneous in a nondimensional height coordinate. The velocity scaling parameter for the gust process is the gust standard deviation, and the length scale used to nondimensionalize the altitude is the vertical space lag associated with the first zero of the gust covariance function. State space theory is used to derive a digital filter from the model, which can be readily used to simulate gusts for space vehicle design applications.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: AIAA PAPER 76-389 , Fluid and Plasma Dynamics Conference; Jul 14, 1976 - Jul 16, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Nonstationary atmospheric boundary layer turbulence simulation (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Report on a new and general technique for simulating atmospheric turbulence-like random processes which are statistically homogeneous along the horizontal and nonhomogeneous along the vertical. This technique is general in the sense that it can be used for a broad class of similar problems. Like the other presently available schemes, the techniques presented are based on the Dryden hypothesis and Taylor's frozen eddy hypothesis; however, they go a step further by utilizing certain self-similarity properties of the Dryden spectral density function which permits the development of height invariant filters. These filters are in turn used to generate vertically homogeneous (statistically) random processes from which turbulence at any specified level in the boundary layer can be simulated, thus facilitating the simulation of a nonstationary turbulence process along the flight path of an aircraft during take-off or landing.
    Keywords: METEOROLOGY
    Type: AIAA PAPER 74-587 , Fluid and Plasma Dynamics Conference; Jun 17, 1974 - Jun 19, 1974; Palo Alto, CA
    Format: text
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