Author: David C. Pridmore-BrownPublisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
Tentative Method for Calculation of the Sound Field about a Source Over Ground Considering Diffraction and Scattering Into Shadow Zones
Author: David C. Pridmore-BrownPublisher:
ISBN:
Category :
Languages : en
Pages : 33
Book Description
Tenative Method for Calculation of the Sound Field about a Source Over Ground Considering Diffraction and Scattering Into Shadow Zones
Author: David C. Pridmore-BrownPublisher:
ISBN:
Category : Diffraction
Languages : en
Pages : 33
Book Description
A semiempirical method is given for the calculation of the sound field about a source over ground considering the effects of vertical temperature and wind gradients as well as scattering of sound by turbulence into shadow zones. The diffracted field in a wind-created shadow zone is analyzed theoretically in the two-dimensional case and is shown to be similar to the results obtained for a temperature created shadow field as givenin NACA TN 3494. The frequency and wind-velocity dependence of the scattered field into the shadow zone is estimated from Lighthill's theory, and on the basis of these two field contributions a semiempirical formula is constructed for the total field which contains two adjustable parameters. From this expression a set of charts has been prepared showing equal sound-pressure contours at 10 feet above ground for various source heights, wind velocities, and frequencies.
Technical Note - National Advisory Committee for Aeronautics
Author: United States. National Advisory Committee for AeronauticsPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 974
Book Description
Technical Note
Author: On Possible Similarity Solutions for Three-dimensional Incompressible Laminar Boundary Layers
Author: Arthur G. HansenPublisher:
ISBN:
Category : Air flow
Languages : en
Pages : 716
Book Description
Solutions of mainstream flow patterns for all possible incompressible laminar-boundary-layer flows having classical similarity with respect to rectangular coordinate systems are derived. These solutions, which apply to a wide range of flows, are summarized in table form.
A Theory of the Sound from Jets and Other Flows in Terms of Simple Sources
Author: Herbert S. RibnerPublisher:
ISBN:
Category : Jet plane sounds
Languages : en
Pages : 122
Book Description
NASA Technical Memorandum
Author: Sound Propagation Near the Earth's Surface as Influenced by Weather Conditions
Author: M. D. BurkhardPublisher:
ISBN:
Category : Noise
Languages : en
Pages : 122
Book Description
Index of NACA Technical Publications
Author: United States. National Advisory Committee for AeronauticsPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 580
Book Description
Author: