Automobile front panel based on acoustic metamaterials
A technology of acoustic metamaterials and dash panels, which is applied to vehicle parts, upper structures, upper structure sub-assemblies, etc., can solve the problems that it is difficult to suppress the middle and low frequency bands, and it is difficult to meet actual needs, and achieve excellent Damping and vibration reduction characteristics, simple structure, reducing the effect of sound insulation and sound absorption accessories
Pending Publication Date: 2019-02-15
AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG
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Problems solved by technology
Traditional sound insulation materials, such as glass fiber cotton, styrofoam, sound insulation and sound-absorbing cotton, etc., these materials mainly rely on the conversion of kinetic energy into heat energy when sound waves propagate in pores to achieve sound wave attenuation, which has a significant effect on high-frequency noise. However, it is difficult to achieve ideal suppression in the low and medium frequency bands.
Therefore, in order to effectively isolate the medium and low frequency sound waves of 600-1200HZ, a material barrier with a thickness of about 70dm is required, which is difficult to meet the actual needs
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[0023] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0024] Such as figure 1 and figure 2 As shown, the automobile dash panel based on the acoustic metamaterial of the present invention includes a plurality of unit structures, and the plurality of unit structures are sequentially connected along the width direction of the dash panel to form the automobile dash panel of the present invention.
[0025] Each unit structure includes a core 1 located at the core, a cladding layer 2 covering the entire core 1, and a matrix 3 covering the entire cladding layer 2. The structural diagram of each unit structure Such as image 3 shown. The core body 1 is made of metal material, and the core body 1 forms a lumped mass, providing a mass m. The cladding layer 2 is made of elastic material to provide elasticity k. In this way, the combination of cladding layer 2 and core body 1 forms a spring mass unit. ...
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The invention discloses an automobile front panel based on acoustic metamaterials. The automobile front panel based on the acoustic metamaterials comprises unit structures; each unit structure comprises a core, a coating layer and a base body, and the cores are positioned at core parts, the coating layers coat on the outsides of the cores, and the matrixes coat on the outsides of the coating layers; the cores are made of metal materials, the coating layers are made of elastic materials, and the coating layers and the cores are combined to form spring quality units. The automobile front panel has a simple structure, has excellent damping and vibration reduction characteristics which are not provided by steel plates with the same thickness on the basis of ensuring strength and rigidity, andthe acoustic metamaterials adopted by the front panel not only has a structural effect, but also has a vibration reduction function, can reduce sound insulation and sound absorption accessories, and further realizes the weight reduction of the front panel.
Description
technical field [0001] The invention relates to the technical field of automobile vibration reduction, in particular to an automobile dash panel based on acoustic metamaterials. Background technique [0002] At present, with the increasingly stringent regulations on noise control and the continuous improvement of users' requirements for the comfort of the acoustic environment in the car, automobile companies are paying more and more attention to achieving the goal of vibration reduction and noise reduction from the initial design. Car N V H (Noise, Vibration and Harshness) performance has become an important design index to evaluate the vehicle performance. [0003] Automotive NVH research involves many components, and the dash panel is an important part of it. Its vibration damping performance directly affects the comfort of driving and riding. Research on the damping design of the dash panel can provide a meaningful reference for structural optimization. The upper part an...
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IPC IPC(8): B62D25/08B60R13/08
CPCB62D25/082B60R13/0838
Inventor 张晶韩强李继伟琚林峰张胜强杨浩
Owner AUTOMOBILE RES INST OF TSINGHUA UNIV IN SUZHOU XIANGCHENG