Phononic crystal sound barrier with self-adaptive function

Abstract

The invention provides a phononic crystal sound barrier with a self-adaptive function. The phononic crystal sound barrier comprises scatterer tubes capable of adjusting the size of a resonant cavity, a sensor, a controller, a driver, an actuator, two stepping push rods, a control panel, a connecting plate and a connecting mechanism of the scatterer tubes. The scatterer in the phononic crystal sound barrier provided by the invention can pick up an audio signal of noise by a sound pick-up according to different main noise frequency bands and transmit the audio signal to a single-chip microcomputer; corresponding noise reduction pulses generated by the single-chip microcomputer act on a stepping motor to drive the stepping motor to rotate, so that the stepping push rods drive the control panel to move, and the inclination degree of each base cotyledon is changed; and then the frequency range of the band gap of the scatterer is changed through the outer diameter of a hinge scatterer and a resonant cavity, so that the band gap frequency band of the scatterer corresponds to the maximum noise amplitude frequency band, the noise environment can be automatically adapted, effective reflection and absorption attenuation of the sound barrier on different noise frequency bands are remarkably enhanced, the effect is good, and 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

Images