Thin film type acoustic metamaterial structure
An acoustic metamaterial and film-type technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of narrow sound insulation range, poor noise elimination ability, and low sound insulation, and achieve stable absorption coefficient, excellent sound absorption performance, and noise elimination. Effect
Active Publication Date: 2022-06-28
开化县钱江源高端装备研究院
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[0003] In view of this, the present invention aims to propose a film-type acoustic metamaterial structure to solve the problem that the sound insulation of thin-film acoustic metamaterials is low and the sound insulation range is relatively narrow , the poor ability of thin-film acoustic metamaterials to eliminate noise in the low frequency range
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[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict, and the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0027] like figure 1 As shown, a mass of a certain size and weight is given to stick on the film. l xi ,l yi ,ρ i Represents the length, width and areal density of the ith mass block, (x i ,y i ) represents the coordinate of the point where the ith mass is closest to the origin. Adding the inertia generated by the mass after the mass is added to the vibration equation of the film as the excitation force exerted by the outside world, the free vibration equation of the film structure with the a...
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The invention provides a thin film type acoustic metamaterial structure, and belongs to the field of noise control. The problems that a thin film type acoustic metamaterial is low in sound insulation amount, the sound insulation frequency band is narrow, and the noise elimination capacity of the thin film type acoustic metamaterial in the low-frequency range is poor are solved. The invention relates to a mass damper which comprises a cylindrical film and a plurality of mass blocks, two ends of the cylindrical film are sealed by films made of the same material, and the mass blocks are adhered to the outer surface of the cylindrical film and are divided into an upper group and a lower group which are arranged along the axis direction of the cylindrical film. The mass block at the upper part and the mass block at the lower part at the same position are arranged oppositely, and the vertical distance between the upper end surface of the mass block at the upper part and the lower end surface of the mass block at the lower part at the same position is the diameter length of the cylindrical film; and the plurality of mass blocks positioned at the upper part and the plurality of mass blocks positioned at the lower part are arranged at equal intervals. The sound insulation amount is high, the sound insulation frequency band is wide, and the thin film type acoustic metamaterial is good in noise elimination capacity in the low-frequency range.
Description
technical field [0001] The invention belongs to the technical field of noise control, and in particular relates to a thin-film acoustic metamaterial structure. Background technique [0002] Thin-film acoustic metamaterials are formed by attaching oscillators to a fixed elastic film. Due to the large difference in areal density between the oscillators and the thin film, under the excitation of a specific frequency of acoustic waves, the oscillators and the thin film vibrate relative to each other, resulting in a sound-insulating band gap. Lightweight, thin layer, and small size are the unique advantages of thin-film acoustic metamaterials. Improving the control performance of thin-film acoustic metamaterials for low-frequency sound waves, and developing acoustic and vibration control technology based on metamaterial theory has become the realization of acoustic metamaterial engineering applications. The basics. SUMMARY OF THE INVENTION [0003] In view of this, the present...
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IPC IPC(8): G10K11/172G10K11/162
CPCG10K11/172G10K11/162
Inventor吴丰民杨彬
Owner开化县钱江源高端装备研究院