Thin plate acoustic meta-material low frequency sound insulation structure
An acoustic metamaterial, thin-plate technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of the complex structure of the thin-film acoustic metamaterial unit, the inability to precisely control the magnitude of the tension, and the complex production process, and achieve the goal of easy low-frequency sound insulation , the effect of rich modalities and large expansion space
Inactive Publication Date: 2018-12-14
XI AN JIAOTONG UNIV +1
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[0005] 2) The material used in most film-type acoustic metamaterials is rubber film. The disadvantages of this material are unstable performance, easy aging, poor mechanical strength, and basically no load-bearing capacity, so additional pre-tension is required, but The magnitude of the tension in actual operation cannot be precisely controlled, so there are relatively large limitations in practical engineering applications
[0006] 3) The unit structure of some thin-film acoustic metamaterials is too complex, and the prototyping process is complicated and time-consuming, which is not conducive to practical engineering applications
[0007] 4) Since the low-frequency sound insulation of thin-film acoustic metamaterials is based on the principle of local resonance, the sound insulation frequency band is relatively narrow. In practical engineering applications, broadband noise needs to be isolated in most working conditions, so measures need to be taken to widen the Its sound insulation bandwidth
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[0045] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thoroughly understood, and will fully convey the scope of the present invention to those skilled in the art.
[0046] It should be noted that certain terms are used in the description and claims to refer to specific components. It should be understood by those skilled in the art that the same component may be referred to by different nouns. The description and the claims do not use the difference in terms as a way to distinguish components, but use the difference in function of the components as a criterion for distinguishing. As referred...
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The invention discloses a thin plate acoustic meta-material low frequency sound insulation structure comprising multiple acoustic meta-material structural units (1) which are mutually combined in an array and an integral outer frame (2). Each acoustic meta-material structural unit (1) used for forming the sound insulation peak in the predetermined low frequency range comprises a left side frame (3) and a right side frame (4) which are mutually combined in an array and a high-molecular polymer sheet (5) which is adhered on at least one of the upper and lower surfaces of the integral outer frame(2), the left side frame (3) and the right side frame (4). The invention also relates to a structure for realizing broadband sound insulation within the predetermined low frequency range, i.e. multiple acoustic meta-material structural units (1) are combined into a composite structural unit (7), at least two mass blocks (6) of different masses are placed on the composite structural unit (7), andfinally the composite structural unit (7) is mutually combined in an array to form the thin plate acoustic meta-material low frequency sound insulation structure.
Description
technical field [0001] The invention relates to the technical field of mechanical noise and environmental noise control, in particular to a thin-plate acoustic metamaterial low-frequency sound insulation structure. Background technique [0002] In daily production and life, there are all kinds of environmental noises such as mechanical equipment noise and traffic noise all the time, and in most cases, noise will have many adverse effects, so noise control is still a social and scientific and technological development process. issues that need to be addressed directly. In particular, the control of low-frequency noise is a daunting challenge. This is because low-frequency noise has a long wavelength, slow attenuation in air and strong penetrating ability, so it is difficult for traditional materials to achieve effective sound due to their weak inherent loss. Attenuation effect. In addition, according to the law of mass density, to achieve effective low-frequency sound insul...
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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 王小鹏陈勇勇寇晓适钱诗林张嵩阳
Owner XI AN JIAOTONG UNIV