Download or read book A Method for the Measurement and the Statistical Analysis of Atmospheric Turbulence written by Stavros Christas Tavoularis and published by . This book was released on 1974 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Statistical Analysis of Atmospheric Turbulence about a Simulated Block Building written by Sidney L. Jr Steely and published by . This book was released on 1981 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Statistical Analysis of Atmospheric Turbulence about a Simulated Block Building written by Sidney L. Steely and published by . This book was released on 1980 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Statistical Study of Atmospheric Turbulence by Flight Measurements written by George Robert Chippendale and published by . This book was released on 1951 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Statistical Analysis of Low Level Atmospheric Turbulence written by Henry W. Tieleman and published by . This book was released on 1973 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Overview of Methodology in the Measurement and Analysis of Atmospheric Turbulence written by Sankarankovil Krishnan Mohan and published by . This book was released on 1983 with total page 262 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 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

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 Statistical Analysis of Turbulence Data from the NASA Marshall Space Flight Center Atmospheric Boundary Layer Tower Array Facility written by Walter Frost and published by . This book was released on 1983 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atmospheric Turbulence Simulation Techniques with Application to Flight Analysis written by Show-Tien Wang and published by . This book was released on 1980 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Statistical modeling of atmospheric turbulence is discussed. The statistical properties of atmospheric turbulence, in particular the probability distribution, the spectra, and the coherence are reviewed. Different atmospheric turbulence simulation models are investigated, and appropriate statistical analyses are carried out to verify their validity. The models for simulation are incorporated into a computer model of aircraft flight dynamics. Statistical results of computer simulated landings for an aircraft having characteristics of a DC-8 are reported for the different turbulence simulation techniques. The significance of various degrees of sophistication in the turbulence simulation techniques on the landing performance of the aircraft is discussed.

Download or read book Novel Methods for the Quantification of Atmospheric Turbulence Strength in the Atmospheric Surface Layer written by Raymond James Oermann and published by . This book was released on 2014 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric turbulence is a random and chaotic process brought about by energy transport mechanisms in the atmosphere. Of particular focus in this research program is the energy transport occurring in the atmospheric surface layer between ground heated air parcels and the air directly above. This dynamic process is impacted by so many apparently random initial conditions and boundary states that a precise analytical description of the process is beyond current computation. The process of turbulence can, however, be statistically analysed and characterised empirically. Observable phenomena such as scintillation have been found to have a range dependence and even the micro-meteorological structure of the turbulent eddies (chiefly responsible for the convective energy transport) have had their spatial distribution, scale size and power spectra examined in detail. As complex as the field is, one is left in no doubt, when viewing a scene through strong turbulence, that this dynamic and random process disrupts and perturbs the passage of visible radiation and is seen to severely degrade the quality of imagery. So the question raised is: "How can the strength of atmospheric turbulence be determined from either physical measurements of meteorological data or from sequences of perturbed imagery?" In order for imagery to be corrected for turbulence-induced degradation, or even the reliability of the imagery for uses such as object recognition and identification, an accurate measure of the current turbulence strength is required. After exploring the turbulence phenomenon and its impact upon laser spots and imagery, three parallel approaches to the determination of the current turbulence strength were pursued in this research program. The first was a controlled laboratory experiment where an artificial turbulent air- stream generated above a hot plate was investigated. Using sensitive temperature probes the temperature structure function (a quantity specifically developed to describe the spatial nature of a turbulent field) in a region of relatively high turbulence strength was determined. The homogeneity and isotropy of this turbulent space was then assessed. The instrument and processes developed were also applied in the field to studies of an ambient turbulent field. Measurements of turbulence strength made in this way were compared to results from a commercial scintillometer. The second line of research was field based. It involved the assessment of a range of observable features of the effects of turbulent air masses upon visible imagery. These features included analysis of the apparent motion of an incoherent light source and features of the scene. These observable effects were assessed along a horizontal path 1.5 m above the ground for their ability to infer the strength of the turbulent air mass through which the radiation had passed. The third line of research involved the development of an understanding of the impact of specific local meteorological parameters on the strength of turbulence. A major outcome from over one hundred days of data was the development of an empirical model of turbulence strength that improves upon previous models from the literature. The merits and shortcomings of each of these approaches to the characterisation of atmospheric turbulence conditions are compared. Ultimately, the ability to use imagery sequences acquired through turbulence, the temperature structure function of a sample volume or an empirical model using meteorological parameters to determine the strength of that turbulence, were assessed. This information is a necessary first step in the development of techniques for the mitigation of turbulence-induced, image distortion.

Download or read book Imaging Through Turbulence written by Michael C. Roggemann and published by CRC Press. This book was released on 2018-02-06 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: Learn how to overcome resolution limitations caused by atmospheric turbulence in Imaging Through Turbulence. This hands-on book thoroughly discusses the nature of turbulence effects on optical imaging systems, techniques used to overcome these effects, performance analysis methods, and representative examples of performance. Neatly pulling together widely scattered material, it covers Fourier and statistical optics, turbulence effects on imaging systems, simulation of turbulence effects and correction techniques, speckle imaging, adaptive optics, and hybrid imaging. Imaging Through Turbulence is written in tutorial style, logically guiding you through these essential topics. It helps you bring down to earth the complexities of coping with turbulence.

Download or read book Analysis of Atmospheric Turbulence Measurements from the 366 Meter SRL WJBF Tower written by Jon Paul Kahler and published by . This book was released on 1975 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Air Turbulence and its Methods of Detection written by Leonardo Di G. Sigalotti and published by CRC Press. This book was released on 2023-02-24 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is a concise guide dealing with the subject of air turbulence and its methods of detection with particular applications to aviation turbulence. It begins with a general description of turbulence and provides a background into the nature and causes of atmospheric turbulence that affect aircraft motion, giving updates on the state-of-the-art research on clear air turbulence (CAT). Important physical processes leading to the Kelvin-Helmholtz instability, a primary producer of CAT, are also explained. The several categories of CAT along with its impact on commercial aviation are also presented in a separate chapter, with particular emphasis on the structural damages to planes and injuries. The central theme of the book deals with both the earlier and the latest CAT detecting methods and techniques for remote and in situ sensing and forecasting. A concise presentation of new technologies for reducing aviation weather-related accidents is also offered. A chapter on the weather accident prevention project of the NASA aviation safety program is also included. Additionally, the book ends with a full description of the recent research activities on CAT and future challenges in turbulence detection, prediction and avoidance.

Download or read book Measurements of the Statistical Properties of Atmospheric Turbulence at Altitudes Below 1000 Feet written by D. G. Gould and published by 1973.. This book was released on 1973 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measured statistical properties of the three components of turbulence are presented for research flights at four altitudes below 1000 feet over flat terrain and two altitudes below 1000 feet over hilly terrain. The measured power spectral density distributions were closely approximated by the von Karman spectral shape. The derived scales of the three components were all about the same, being approximately proportional to height over the flat terrain. The derived scales at the higher altituded appeared to be related to the terrain a considerable distance up-wind from the track along which the measurements were made. (Author Modified Abstract).

Download or read book Atmospheric Turbulence a Comparison of U S and U K Methods of the Collection Evaluation and Analysis of Data written by R. T. Sewell and published by . This book was released on 1962 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Turbulence in the Atmosphere written by John C. Wyngaard and published by Cambridge University Press. This book was released on 2010-01-28 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on his over forty years of research and teaching, John C. Wyngaard's textbook is an excellent up-to-date introduction to turbulence in the atmosphere and in engineering flows for advanced students, and a reference work for researchers in the atmospheric sciences. Part I introduces the concepts and equations of turbulence. It includes a rigorous introduction to the principal types of numerical modeling of turbulent flows. Part II describes turbulence in the atmospheric boundary layer. Part III covers the foundations of the statistical representation of turbulence and includes illustrative examples of stochastic problems that can be solved analytically. The book treats atmospheric and engineering turbulence in a unified way, gives clear explanation of the fundamental concepts of modeling turbulence, and has an up-to-date treatment of turbulence in the atmospheric boundary layer. Student exercises are included at the ends of chapters, and worked solutions are available online for use by course instructors.