A Phononic Crystal Sound Barrier with Adaptive Function

Abstract

The invention provides a phononic crystal sound barrier with self-adaptive function, including a diffuser tube with adjustable resonant cavity size, a sensor, a controller, a driver, an actuator, two stepping push rods, a control board, and a connecting board and the connection mechanism of the scatterer tube; the scatterer in the phononic crystal sound barrier provided by the present invention can pick up the audio signal of the noise by the pickup according to different main noise frequency bands, and transmit it to the single-chip microcomputer, and generate corresponding noise reduction by the single-chip microcomputer. The noise pulse acts on the stepping motor, drives the stepping motor to rotate, makes the stepping rod drive the control board to move, changes the inclination of each base cotyledon, and then changes the bandgap of the scatterer through the outer diameter of the hinge scatterer and the resonant cavity The frequency range makes the bandgap frequency band of the scatterer correspond to the maximum amplitude frequency band of the noise, which can automatically adapt to the noise environment, significantly enhance the sound barrier to effectively reflect and absorb and attenuate different noise frequency bands, the effect is good, and the noise reduction is more targeted.

Description

technical field [0001] The invention relates to the technical field of highway traffic noise control, in particular to a phonon crystal sound barrier with an adaptive function. Background technique [0002] At present, while expressways bring great convenience to the society, they also bring serious noise pollution to the residents along the highway. In my country's main traffic lines, the roadside environmental noise is higher than 70dB(A) noise level during the day and higher than 55dB at night. (A) Noise accounted for 80%. Serious road noise pollution has become an environmental problem that cannot be underestimated in road construction. The phononic crystal is a periodic composite material with elastic wave band gap characteristics. Its basic feature is that when the elastic wave propagates in the phononic crystal, it is affected by its internal periodic structure to form a special dispersion relationship, that is, the energy band structure. The frequency range between ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is: for the lack of universal adaptability of the existing phononic crystal sound barrier noise reduction in the prior art, for different periods of different road sections, the dominant factors of noise generation are different, and the characteristic noise spectrum is also different, due to its established The structure can only produce a specific band gap problem. An adaptive phononic crystal sound barrier of the present invention can effectively attenuate traffic noise in a more targeted manner according to the difference in the noise environment spectrum, and reduce the Sound pressure, making the noise reduction effect of the sound barrier more effective and more targeted

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