Download or read book Examples of Low Altitude Atmospheric Turbulence Measurements by Gnat XP505 written by G.W. Foster and published by . This book was released on 1983 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement and Analysis of Low Altitude Atmospheric Turbulence Obtained Using a Specially Instrumented Gnat Aircraft written by G. W. Foster and published by . This book was released on 1987 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed measurements of atmospheric turbulence made by a specially instrumented Gnat aircraft at altitudes below one thousand feet over a variety of terrains are described. A programme of flying yielded about 400 runs for which time histories of the three components of turbulence are available. These runs are analysed to give parameters which summarize the statistical characteristics of the turbulence encountered. A very strong relationship between two parameters from the Statistical Discrete Gust analysis technique and one from the Power Spectral Density technique is identified.
Download or read book Analysis of Low Altitude Atmospheric Turbulence Data Measured in Flight written by Victor M. Ganzer and published by . This book was released on 1977 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Turbulence Measurements Obtained from Airplane Operations at Altitudes Between 20 000 and 75 000 Feet for Several Areas in the Northern Hemisphere written by Thomas L. Coleman and published by . This book was released on 1960 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Aeronautical Journal written by and published by . This book was released on 1989 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Atmospheric Turbulence Upon Flight at Low Altitude and High Speed written by Charles Boris Notess and published by . This book was released on 1961 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Power Spectral Measurements of Clear air Turbulence to Long Wavelengths for Altitudes Up to 14 000 Meters written by Harold N. Murrow and published by . This book was released on 1982 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spanwise Measurements of Vertical Components of Atmospheric Turbulence written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Correlation and spectrum magnitude estimates are computed for vertical gust velocity measurements at the nose and wing tips of a NASA B-57B aircraft for six level flight, low speed and low altitude runs and are compared with those of the von Karman atmospheric turbulence model extended for spanwise relationships. The distance between the wing tips was 62.6 ft. Airspeeds ranged from about 330 to 400 ft/sec, heights above the ground ranged from near ground level to about 5250 ft. and gust velocity standard deviations ranged from 4.10 to 8.86 ft/sec. Integral scale lengths, determined by matching measured autocorrelation estimates with those of the model, ranged from 410 to 2050 ft. Digital signals derived from piezoelectric sensors provided continuous pressure and airspeed measurements. Some directional acceleration sensitivity of the sensors was eliminated by sensor orientation, and their performance was spectrally verified for the higher frequencies with supplemental onboard piezoresistive sensors. The model appeared to satisfactorily predict the trends of the measured cross-correlations and cross-spectrum magnitudes, particularly between the nose and wing tips. However, the measured magnitude estimates of the cross-spectra between the wing tips exceeded the predicted levels at the higher frequencies. Causes for the additional power across the wing tips were investigated. Vertical gust velocity components evaluated along and lateral to the flight path implied that the frozen-turbulence-field assumption is a suitable approximation. Sleeper, Robert K. Langley Research Center...
Download or read book Atmospheric Conditions Associated with Turbulence Encountered by the XB 70 Airplane Above 40 000 Feet Altitude written by L. J. Ehernberger and published by . This book was released on 1968 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Turbulence Characterization of a Low Altitude Long Horizontal Path written by Wesley Allan Bernard and published by . This book was released on 1996 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spanwise Measurements of Vertical Components of Atmospheric Turbulence written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Correlation and spectrum magnitude estimates are computed for vertical gust velocity measurements at the nose and wing tips of a NASA B-57B aircraft for six level flight, low speed and low altitude runs and are compared with those of the von Karman atmospheric turbulence model extended for spanwise relationships. The distance between the wing tips was 62.6 ft. Airspeeds ranged from about 330 to 400 ft/sec, heights above the ground ranged from near ground level to about 5250 ft. and gust velocity standard deviations ranged from 4.10 to 8.86 ft/sec. Integral scale lengths, determined by matching measured autocorrelation estimates with those of the model, ranged from 410 to 2050 ft. Digital signals derived from piezoelectric sensors provided continuous pressure and airspeed measurements. Some directional acceleration sensitivity of the sensors was eliminated by sensor orientation, and their performance was spectrally verified for the higher frequencies with supplemental onboard piezoresistive sensors. The model appeared to satisfactorily predict the trends of the measured cross-correlations and cross-spectrum magnitudes, particularly between the nose and wing tips. However, the measured magnitude estimates of the cross-spectra between the wing tips exceeded the predicted levels at the higher frequencies. Causes for the additional power across the wing tips were investigated. Vertical gust velocity components evaluated along and lateral to the flight path implied that the frozen-turbulence-field assumption is a suitable approximation. Sleeper, Robert K. Langley Research Center...
Download or read book Low Altitude Atmospheric Turbulence LO LOCAT Phase 3 Volume 1 Part 1 Data Analysis written by and published by . This book was released on 1970 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents procedures, analysis methods, and final results pertaining to the LO-LOCAT Phase 3 program. Approximately 150 hours of low altitude (100 - 1000 feet) turbulence and associated meteorological data were recorded from 16 August 1968 through 30 June 1969. A model of the turbulence environment at low-level is presented in terms of gust velocity primary peaks, level crossings, amplitude samples, rms values, and gust maxima, as well as derived equivalent gusts, turbulence scale lengths, and power spectra. Mathematical expressions for turbulence spectra, scale length, and primary peak statistics are shown. Correlations between atmospheric gust velocities and meteorological and geophysical phenomena are evaluated. It was found that gust velocity magnitude at low altitude is most affected by atmospheric stability and terrain. Gust velocity rms values above 1.5 fps may be approximated by truncated Gaussian distributions. For wavelengths less than 15,000 feet, turbulence spectra are best represented by the von Karman mathematical expressions. The turbulence, sampled for 4-1/2 minute intervals over a distance of approximately 32 miles at absolute altitudes below 1,000 feet, was found to be basically stationary, isotropic, and homogeneous.
Download or read book Study of Three Models of Low Altitude Atmospheric Turbulence by Pilot Opinion written by Jean-Paul Duval and published by . This book was released on 1969 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Altitude Atmospheric Turbulence written by J. W. Jones and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low altitude Atmospheric Turbulence Around an Airport written by Stanley Dale Cass and published by . This book was released on 1972 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Altitude Atmospheric Turbulence LO LOCAT Phase 3 Volume 2 Part 2 Frequency Data Plots written by and published by . This book was released on 1970 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents procedures, analysis methods, and final results pertaining to the LO-LOCAT Phase III program. Approximately 150 hours of low altitude (100 - 1000 feet) turbulence and associated meteorological data were recorded from 16 August 1968 through 30 June 1969. A model of the turbulence environment at low-level is presented in terms of gust velocity primary peaks, level crossings, amplitude samples, rms values, and gust maxima, as well as derived equivalent gusts, turbulence scale lengths, and power spectra. Mathematical expressions for turbulence spectra, scale length, and primary peak statistics are shown. Correlations between atmospheric gust velocities and meteorological and geophysical phenomena are evaluated. It was found that gust velocity magnitude at low altitude is most affected by atmospheric stability and terrain. Gust velocity rms values above 1.5 fps may be approximated by truncated Gaussian distributions. For wavelengths less than 15,000 feet, turbulence spectra are best represented by the von Karman mathematical expressions. The turbulence, sampled for 4-1/2 minute intervals over a distance of approximately 32 miles at absolute altitudes below 1,000 feet, was found to be basically stationary, isotropic, and homogeneous.
Download or read book The Measurement of Atmospheric Turbulence at Very Low Altitude and High Speed mesure de la Turbulence Atmospherique a Tres Basse Altitude Et Grande Vitesse written by Jean Angelini and published by . This book was released on 1963 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
