Active vibration and noise control mechanism and method for beam structures

Abstract

An active vibration and noise control mechanism and method for beam structures. Based on tracking the sound frequency of noise, the two-way electromagnetic semi-active dynamic vibration absorber is controlled by the open-loop coarse adjustment of the frequency identification algorithm to suppress the structural vibration of the sound source structure, and realize the sound from the sound source. The source weakens the radiation of the noise, and further realizes further closed-loop fine adjustment through the feedback acceleration signal to achieve the best noise reduction effect. The invention can not only realize the construction of the corresponding relationship of the peak value of the sound power adaptively in combination with the vibration frequency, but also can make up for the defect that the traditional method is not effective for the middle and low frequency bands.

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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