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Some Aspects of Ray Representation Running Sound waves in Liquid Spaces

Open Journal of Acoustics 2013年第1期3卷 7-13页

作者： V. P. Ivanov G. K. Ivanova Institute of Applied Physics Russian Academy of Sciences Nizhny Novgorod Russia

Work is devoted to the analysis of errors meeting in literature in treatment of a spatial part of a phase of running sound waves. In some cases, it is not taken into consideration that this part of a phase is formed by scalar product of vectors which does not depend on a choice of system of co-ordinates. Taking into account the necessary corrections in record of a phase of plane waves, it is shown that the decision of the homogeneous wave equation in the form of “belated” potentials is simultaneously and the decision of the equations of movement of a liquid, and “outstripped” potentials does not satisfy them. The analysis of coefficients of reflection and passage of running waves in non-uniform space is carried out. It is shown that on boundary of spaces with different sound speeds, a turning point of a sound wave is the point of full internal reflection. The way of calculation of coefficients of reflection and passage is offered by consideration of all three waves on boundary of spaces as vectors with the set directions and amplitude of a falling wave. Calculation of coefficients of reflection and passage of a sound wave in a wave-guide of canonical type along the chosen trajectory by two methods—under traditional formulas and a vector method is carried out. Results of calculation practically coincide.

关键词： Sound Running waves wave Equation Reflection Passage Liquid Space wave-guide Rays

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A New Concept of Calculation Coefficietns of Reflection and Passage Sound waves on the Boundary of Liquid Spaces

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Open Journal of Acoustics 2013年第3期3卷 72-79页

作者： V. P. Ivanov G. K. Ivanova Institute of Applied Physics Russian Academy of Sciences Nizhny Novgorod Russia

It is consider that, from the standpoint of the law of conservation of energy, the process of converting sound wave falls on the boundary between two spaces in two, leaving the boundary, reflected and passage. It is assumed that the simultaneous presence of three waves is impossible, and that the process of converting one wave in two waves occurs instantaneously. Based on this concept, enter the following boundary conditions for the calculation of amplitudes (coefficients) of the reflected and passage waves. The initial phases of the reflected and passage waves coincide with the phase of the falling wave. The energy of the falling wave is equal to the sum of the energies of the reflected and passage waves. The normal component velocity amplitude of the particle of the liquid under the influence of the falling wave is equal to the sum of the normal component of particle velocity amplitudes of the reflected and passage waves. It was found that the character of dependence of the reflection coefficient on the angle of departure of the initial wave is the same as in the traditional formulas, but the coefficient of passage does not exceed unity. Calculations of reflection and passage coefficients for different values of the refractive coefficient at the boundary between two homogeneous spaces as well as the canonical form of the waveguide, wherein the speed of sound which is minimum at predetermined depth is carried out.

关键词： Sound Running waves Trajectory Phase Reflection Passage Liquid Space wave-guide

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Analysis and Simulation of Propagation Characteristics of SLF Communication

Analysis and Simulation of Propagation Characteristics of SL...

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2012年计算机应用与系统建模国际会议

作者： Chen Zhiyi Zhou Suihua Yan Bing Dep. of Weaponry Engineering Naval University of Engineering

From propagation characteristics of SLF communication, theoretical models have been deduced by wave-guide theory and formulas of vertical electric field and horizonal magnetic field also have been presented. Attenuation rates of SLF communication in earth-ionosphere and in the sea have been *** the value of attenuation rate in daytime is more than that in nighttime. Atmosphere noises and direction effect also have an influence on SLF communication. By the way,in practice Schumann resonance frequency should be a avoided.

关键词： SLF Communication Propagation characteristics wave-guide Attenuation rate

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