Control method for bubble motion chaotization in sound field based on parameter perturbation

Abstract

The invention belongs to the field of non-linear acoustics, and particularly relates to a control method for bubble motion chaotization in a sound field based on parameter perturbation. The method comprises the steps: obtaining a radius and a pulsation speed of a three-dimension autonomous bubble at any time; measuring resonant frequency of the bubble, and estimating the size of a balance radius of the bubble; conducting the parameter perturbation on a bubble vibration system; and building a perturbation control parameter database under different balance radiuses of the bubble. According to the control method, a dynamics model of bubble motion under the parameter perturbation is built, the control method for the bubble motion chaotization based on the parameter perturbation is provided, limitation of a high-intensity and additionally incentive sound filed sound pressure level achieving the bubble motion chaotization is overcome, and requirements on devices such as underwater acoustic emission transducer and a power amplifier are reduced. Real-time picking of bubble vibration responses is avoided. The method improves the chaotization effect of the system, and achieves the optimal control on bubbles of the different radiuses.

Description

technical field [0001] The invention belongs to the field of nonlinear acoustics, and in particular relates to a method for controlling the chaos of bubble motion in a sound field based on parameter perturbation. Background technique [0002] At present, the research on the motion state of bubbles in the sound field mainly focuses on the nonlinear dynamic behavior of the bubble vibration system under the action of the periodic external sound field. Bubbles will vibrate under the excitation of sound waves of a certain frequency and amplitude. If only radial vibration is considered, it can be considered that the change of the bubble radius over time is the response of the system, that is, the contraction and expansion of the bubble. [0003] From the existing theoretical basis, the vibration law of the bubbles in the liquid medium satisfies a certain form of differential equation, and the motion state of the bubbles in the sound field can be studied through the solution of the...

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Problems solved by technology

But for the bubble vibration system, this method has its limitations. On the one hand, due to the instability of the bubble, it is difficult to obtain the bubble vibration response in real time. On the other hand, when the high sound intensity sound wave is used as the input excitation of the bubble vibration system, due The nonlinear effect of the medium will produce waveform distortion, and this method has high requirements on the accuracy of the feedback signal, so that the sound wave as the feedback excitation will have an adverse effect on the chaotic effect of the system

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