Output adjustment method for sound energy obtained by sound wave interaction in nonlinear medium

A non-linear medium and output regulation technology, applied in transducer circuits, sensors, electrical components, etc.

Inactive Publication Date: 2012-06-20
HARBIN ENG UNIV
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Problems solved by technology

There is no variable parameter interaction on the acoustic wave to generate ω 2 The change characteristics of the amplitude of the three columns of sound waves

Method used

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  • Output adjustment method for sound energy obtained by sound wave interaction in nonlinear medium
  • Output adjustment method for sound energy obtained by sound wave interaction in nonlinear medium
  • Output adjustment method for sound energy obtained by sound wave interaction in nonlinear medium

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Embodiment Construction

[0056] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0057] Based on the Burgers equation, the present invention obtains the expression of the amplitude of each sound field after the interaction between the weak signal wave and the pump wave, and uses the Runger-Kutta method to simulate the amplitude or energy of each sound field with the propagation distance The change curve of the acoustic wave can intuitively obtain the energy transfer process after the interaction of the nonlinear variable parameter of the acoustic wave, and use the transfer to realize the adjustment of the output energy of the three-column wave.

[0058] The variable parameter interaction phenomenon of the sound wave is explained by the language of quantum mechanics, that is, it can be regarded as a high-frequency pump wave ω 3 The phonon splits into two low frequency ω 1 、 ω 2 Phonons, or the process of splitting...

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Abstract

The invention provides an output adjustment method for sound energy obtained by sound wave interaction in a nonlinear medium. The output adjustment method comprises the following steps of: (a) performing nonlinear interaction on a pump wave with the frequency of w3 and a weak signal wave with the frequency of omega1, and generating a resonance wave with the frequency of omega2; (b) respectively calculating amplitude values B1(x), B2(x) and B3(x) of the three waves at the displacement x after interaction according to the frequencies omega3, omega1 and omega2 of the pump wave, the weak signal wave and the resonance wave; and (c) adjusting the output energy of the three waves according to the change characteristics of the amplitude values B1(x), B2(x) and B3(x) of the pump wave, the weak signal wave and the resonance wave. According to the output adjustment method, the energy of the generated sound wave is changed according to a pulse rule on the basis of a basic theory of interaction of sound waves in optics and hydroacoustics; therefore, the output energy of each wave can be adjusted according to actual requirements.

Description

technical field [0001] The invention relates to the field of nonlinear interaction of acoustic waves, in particular to an output adjustment method for nonlinear parameter interaction between acoustic waves. Background technique [0002] Since Westervelt proposed the concept of using the nonlinear interaction of sound and sound to form a parametric array in 1960, the development of nonlinear acoustics has become faster and faster, and its application has become wider and wider. Many achievements have been made in its research and application. new progress. The nonlinear interaction of acoustic waves in water can be considered as a variable parameter transmitter or a variable parameter receiver formed in the interaction region. The concept of variable parameter interaction process was born in radio science. Its essence is that when the capacitance or inductance in an oscillating circuit changes periodically, the weak electrical signal can be amplified or weakened. In the pro...

Claims

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Application Information

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IPC IPC(8): H04R3/00
Inventor 杨德森兰朝凤时胜国李思纯洪连进
Owner HARBIN ENG UNIV
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