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Development Of A Microburst Turbulence Model For The Joint Airport Weather Studies Wind Shear Data
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Book Synopsis Development of a Microburst Turbulence Model for the Joint Airport Weather Studies Wind Shear Data by : Ho-Pen Chang
Download or read book Development of a Microburst Turbulence Model for the Joint Airport Weather Studies Wind Shear Data written by Ho-Pen Chang and published by . This book was released on 1987 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: A turbulence model is developed to supplement the microburst quasi-steady wind shear model established earlier from the JAWS Doppler radar data sets. The wind shear model is, in effect, a quasi-steady, spatially varying wind field. The spatial scale of the wind variation is on the order of 500-750 ft (150-200 m). Airborne sensor response (i.e., angle of attack, stall warning, pitot tubes, etc,), structural dynamics, pilot workload, and other such factors, however, respond to much higher frequency wind effects. To account for these effects, a 'first-cut' turbulence model based on Doppler radar second moment data is presented. Superimposing the turbulent fluctuation from this turbulence model on the quasi-steady JAWS wind field is believed to provide a more realistic simulation of the microburst flow for aviation application. The Doppler radar second moments of spectral width data from the June 30, July 14, and August 5, 1982, JAWS microburst measurements are analyzed in considerable detail. Microburst turbulence intensity is calculated by subtracting the spectral width broadenings due to wind shear, antenna motion, and precipitation fall speeds from the radar spectra width. (Author).
Book Synopsis Microburst Wind Shear Models from the Joint Airport Weather Studies (JAWS). by :
Download or read book Microburst Wind Shear Models from the Joint Airport Weather Studies (JAWS). written by and published by . This book was released on 1985 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple Doppler radar data collected during the Joint Airport Weather Studies (JAWS) Project is used to synthesize the three-dimensional wind in the region of a microburst. A six-degree-of-freedom numerical aircraft model having characteristics similar to Boeing 727 series aircraft is used to investigate jet transport aircraft response to microburst winds during simulated approaches and departures. Simple pilot control laws are used to adjust thrust, pitch, roll, and yaw so as to maintain given approach or departure parameters. Generally, when horizontal wind shear along the approach or departure path is .0001/s or greater, the model is unable to maintain the desired approach path and suffers a significant reduction in climb performance during a go-around or departure. Although the mean wind shear along a path gives a good qualitative measure of the wind shear threat to a jet transport, different paths with similar mean shears can yield markedly different results, as do the same paths with similar mean shears can yield markedly different results, as do the same paths through the microburst at different times, emphasizing the fine temporal and spatial scale of microburst winds. Finally, during the approximate 30 s period required for the aircraft to traverse the region of highest horizontal shear, time variations in the microburst wind field are shown to insignificantly affect the modelled flight path because the traverse period is a short time compared to the life time of a microburst.
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Book Synopsis Wind Shear/turbulence Inputs to Flight Simulation and Systems Certification by : Roland L. Bowles
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Book Synopsis Publications and Creative Achievements by : University of Tennessee (System)
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