Acoustic Gravity Waves in the Atmosphere
Department of Electrical Engineering, Stanford University., 1965 - Sound-waves - 98 pages
The purpose of this research was to obtain a panoramic view of acoustic-gravity-wave motions throughout the atmosphere. A one-dimensional array of particles and springs, conceived by Newton to study sound waves in the atmosphere, was extended to two dimensions by means of 1500 particles interconnected by springs. Variations of density and pressure with altitude are represented by variations in mass and spring constants. This new model has provided means by which acoustic-gravity-wave motions in the atmosphere are solved on a high-speed digital computer, and a new animated-computer-output technique is used. A motion picture--automatically plotted by the computer, a frame at a time--provides greater detail and perspective of mechanical wave motions in the atmosphere than has ever been obtainable before. Ground-level and 100-km-high explosions were investigated with this computer model, and the resulting transient motions of the atmosphere were displayed by means of a motion picture produced by digital techniques. Computed ground-level barograms resulting from a ground-level explosion compare well with experimental barograms recorded during ground-level nuclear explosions. (Author).
What people are saying - Write a review
We haven't found any reviews in the usual places.
BACKGROUND FOR ACOUSTICGRAVITYWAVE ANALYSIS
AIRCELL COMPUTER MODEL OF THE ATMOSPHERE
1 other sections not shown
acoustic-gravity waves acoustic-gravity-wave air cell air-cell computer model air-cell model air-cell orbits resulting altitude approximately atmo barograms resulting barographs boundary calculated contours coordinate cutoff frequency cylindrical wavefronts D.C. Attn density gradient diagonal springs displacement energy sources energy-density equations of motion Equilibrium air-cell orbits F region filament source finite-difference fluid gravity waves ground-level explosion ground-level point source ground-level source group velocity high-altitude horizontal direction hydrodynamic equations lattice of particles low-frequency masses and springs mechanical analogy mechanical lattice mechanical wave motion picture NOVAYA ZEMLYA one-dimensional lattice particles and springs perturbational pressure disturbance ray theory raypaths raytracings refractive-index refractive-index surfaces represent scale height shown in Fig sinusoidal point source sound duct SOURCE ENERGY spring constants temperature THEORETICAL BAROGRAMS throughout the atmosphere two-dimensional lattice U.S. Army U.S. STANDARD ATMOSPHERE Vaisala various ground distances VERTICAL ENERGY DISTRIBUTIONS Washington 25 wave period wave propagation wavelength x(i+l,J+l,t