Download or read book Experimental Investigations on the Scattering of Sound by Turbulence written by Dieter W. Schmidt and published by . This book was released on 1961 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental investigations of the scattering of sound by turbulence were performed in a wind tunnel. Turbulence was produced by grids of parallel circular rods (with diameters of 0.1 to 1.0 cm and grid meshlengths of 0.5 to 2. 5 cm); the sound frequencies covered a range of 100 to 500 kc. Disturbances of the measurements due to reflections of sound waves at the tunnel walls were avoided by the application of short sound pulses. The dependence of the damping of the sound waves on the sound frequency, the Mach number of the turbulence, the length of the sound path in the turbulent flow and a predominant direction of the turbulent eddies was measured. Theoretical predictions were confirmed and partly extended. In the range of the parameters which is of interest for practical use the most important results are the proportionality of the damping to the square of the sound frequency and to the square of the turbulent Mach number. Based on the measurements and the theoretical considerations, a formula is derived which is applicable to the damping of sound by turbulent scattering in the atmosphere. (Author).

Download or read book Recent Experimental Investigations on the Scattering of Sound by Turbulence written by Dieter W. Schmidt and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental investigations of the scattering of sound by turbulence were performed in a wind tunnel. Recent theoretical predictions concerning the sound attenuation are well confirmed and partly extended by the measurements. In the range of the parameters which is of interest for practical applications the most important results obtained are the proportionality of the sound attenuation to the square of the sound frequency and to the square of the turbulent Mach number. A formula is derived from which the turbulent attenuation of directed sound (such as aircraft noise in the free atmosphere) can be calculated. A method for measuring large phase variations is described in preliminary form; it will be used to investigate the influence of turbulent scattering on the phase angle of the sound waves.

Download or read book Collected Reprints 1970 1971 written by Wave Propagation Laboratory and published by . This book was released on 1972 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book AFOSR written by United States. Air Force. Office of Scientific Research and published by . This book was released on 1968 with total page 968 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 1994 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurements of the Scattering of Sound from Turbulence written by William Baerg and published by . This book was released on 1964 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Collected Reprints written by and published by . This book was released on 1972 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Collected Reprints of the Wave Propagation Laboratory written by and published by . This book was released on 1967 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Meteorological Observations and Instrumentation written by S. Teweles and published by Springer. This book was released on 2016-07-15 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objects of the American Meteorological Society are "the development and dissemination of knowledge of meteorology in all its phases and applications, and the advancement of its professional ideals." The organization of the Society took place in affiliation with the American Association for the Advancement of Science at Saint Louis, Missouri, December 29, 1919, and its incorporation, at Washington, D. C., January 21, 1920. The work of the Society is carried on by the Bulletin, the Journal, and Meteorological Monographs, by papers and discussions at meetings of the Society, through the offices of the Secretary and the Executive Secretary, and by correspondence. All of the Americas are represented in the membership of the Society as well as many foreign countries.

Download or read book NASA Technical Note written by and published by . This book was released on 1974 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Third Conference on Sonic Boom Research written by Ira R. Schwartz and published by . This book was released on 1971 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Prediction methods for sonic boom generation and propagation with overpressure minimization in supersonic transport design and operation.

Download or read book Report written by and published by . This book was released on 1963 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1963 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Acoustic Remote Sensing Applications written by Sagar Pal Singal and published by Springer. This book was released on 2005-10-21 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, which is divided into three parts, gives a state-of-the-art report on technical developments in instrumentation and on theoretical advancements in acoustic remote sensing. It explains the utilization of acoustic techniques in studies related to the structure of the lower atmosphere and oceans and discusses various atmospheric and oceanic applications. The potential and limitations of acoustic remote sensing are also described. This book will be useful to researchers, graduate students, and teachers interested in the structure of the atmosphere and oceans.

Download or read book Fusion Energy Update written by and published by . This book was released on 1978 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ultrasonics International 93 written by Sam Stuart and published by Butterworth-Heinemann. This book was released on 2013-09-11 with total page 881 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasonics International 93: Conference Proceedings presents a comprehensive account of the presentations given in the Ultrasonics International 93 conference. It discusses a blood flow mapping system using ultrasonic waves. It addresses the dynamical response functions of elastically anisotropic solids. Some of the topics covered in the book are the ultrasonic waves propagation in a liquid producing radicals; ultrasonic characterization of interfaces; surface acoustic wave measurements; line-focus-beam acoustic microscopy; investigation of fatigue cracks in steels using spherical lens scanning acoustic microscopy; and the phenomenon of ultrasonic light diffraction. The description of bichromatic tunable acousto-optic separator is fully covered. The diffraction phenomenon affecting the properties of the fibre-optic sensor system is discussed in detail. The text describes in depth the opto-acoustic measurement of ultrasound velocity in a solidifying polymer. The evaluation of microfracture due to thermal shock using acoustic emission is completely presented. A chapter is devoted to the detection of a weak adhesive and adherent interface in bonded joints. The book can provide useful information to engineers, students, and researchers.