Download or read book Power Spectra of the Vertical Component of Atmospheric Turbulence Obtained from Concurrent Measurements on an Aircraft and at Fixed Points written by A. Burns and published by . This book was released on 1960 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Power Spectra of the Vertical Component of Atmospheric Turbulence Obtained from Concurrent Measurements on an Aircraft and at Fixed Points written by Aeronautical Research Council (Great Britain) and published by . This book was released on 1963 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Papers written by and published by . This book was released on 1950 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1964 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Papers written by Aeronautical Research Council (Great Britain) and published by . This book was released on 1965 with total page 936 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 Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Power Spectral Analysis of Concurrent Airplane and Tower Measurements of Atmospheric Turbulence written by U. OSCAR. LAPPE and published by . This book was released on 1960 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The joint tower-airplane experiment was designed to provide concurrent turbulence data for one flight level (at or near tower height) and at the same time to supplement these data with airplane measurements above, and tower measurements below, the tower height. Three tower locations were incorporated in this experiment in an attempt to determine the effects of diffn be simply related to turbulence measured at a fixed point as a function of time, (2) Obtain data for examining low level temporal and spatial homogeneity, (3) Investigate the influence of terrain variations on the turbulence power spectral densitrent topographical conditions on the turbulence spectrum. The 4 principal objectives were: (1) Obtain data to test the hypothesis of G.I. Taylor (1937) that turbulence encountered along a path in space aligned with the mean wind can be simply related to turbulence measured at a fixed point as a function of time, (2) Obtain data for examining low level temporal and spatial homogeneity, (3) Investigate the influence of terrain variations on the turbulence power spectral densities, and (4) Investigate the variation of turbulence characteristics with height above ground. (Author).
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 NASA Contractor Report written by United States. National Aeronautics and Space Administration and published by . This book was released on 1973 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Atmospheric Turbulence Spectra Obtained from Concurrent Airplane and Tower Measurements written by U. O. Lappe and published by . This book was released on 1959 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Atmospheric Turbulence Over a Wide Range of Wavelength for One Meteorological Condition written by Harold L. Crane and published by . This book was released on 1956 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for obtaining a power spectrum of gust vertical velocity over a wide range of wavelength from simultaneous measurements made in flight has been devised and applied. This method has the advantage of not involvhg the use of airplane transfer functions. A gust vertical velocity spectrum was determined for one meteorological condition for wavelengths from 10 feet to 60,000 feet. The test was conducted at low altitude in clear- turbulence having a root-mean-square intensity of 5 feet per second. At the higher frequencies (shorterwavelengths), the power spectral density varied at a rate which was between the -5/3 power which has been predicted theoretically and the inverse square of the frequency. The spectrum which was obtained tended to flatten out for the longest test wavelengths.The break frequency which provides an indication of the scale of the turbulence occurred at a wavelength of approximately 6,000 feet. The results obtained indicate that the method of obtaining spectra used in this investigation is practicable.
Download or read book Journal of the Royal Aeronautical Society written by and published by . This book was released on 1965 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Measured Power Spectrum of the Vertical Component of Atmospheric Turbulence written by Aeronautical Research Council and published by . This book was released on 1960 with total page 15 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 A Measured Power Spectrum of the Vertical Component of Atmospheric Turbulence written by Aeronautical Research Council and published by . This book was released on 1960 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
