Active vibration noise control mechanism and method for beam structure

Abstract

The invention discloses an active vibration noise control mechanism and method for a beam structure. Based tracking of on acoustic frequency of noise, a bidirectional electromagnetic semi-active dynamic vibration absorber is controlled to perform structural vibration suppression on a sound source structure through open-loop coarse adjustment of a frequency identification algorithm, so that radiation of noise is weakened from a sound source; and further closed-loop fine adjustment is realized through an acceleration signal obtained through feedback, so that an optimal noise reduction effect isachieved. According to the method, the corresponding relation of the sound power peak values can be built in a self-adaptive mode in combination with the vibration frequency, and the defect that a traditional method is poor in medium-low frequency band effect can be overcome.

Description

technical field [0001] The invention relates to a technology in the field of mechanical vibration, in particular to an autonomous intelligent (adaptive active control) vibration and noise control method for beam structures. Background technique [0002] From the perspective of structural acoustics, the principle of sound propagation is that the medium molecules are driven by the vibration of the surface of the structure to form a pressure wave centered on the surface of the structure and spread outward. Therefore, the sound frequency information detected at a point outside the structure can effectively characterize the sound source. This provides a theoretical basis for active vibration and noise control methods, that is, based on sound frequency detection, to achieve active noise reduction of sound sources by suppressing structural vibrations. [0003] As an effective means of vibration reduction, dynamic vibration absorbers have been applied in many fields. The main struc...

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Problems solved by technology

[0005] In view of the deficiencies of the existing passive vibration and noise reduction methods and the defects of the above-mentioned technologies, the present invention proposes an active vibration and noise control method for beam structures, which can not only track the noise frequency, but also realize the active noise reduction of the sound source by suppressing the structural vibration. Moreover, in the effective working frequency band, it can also make up for the shortcomings of traditional methods that are not effective for the middle and low frequency bands.

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