How about the sound insulation effect of carbon fiber aluminum honeycomb panel

Generally speaking, the greater the surface density of the board, the better the sound insulation effect, but the pursuit of high surface density will also bring about an increase in costs and increase the difficulty of transportation and handling costs. In the selection of wall and partition materials for industrial plants, high-rise buildings, public facilities, etc., the traditional clay wall has shortcomings such as self-weight and large occupied area, and is gradually replaced by a new type of lightweight composite wall.

Generally speaking, the sound insulation of a brick wall with a thickness of 24cm is about 40dB, while the average sound insulation of a light wall with an areal density of 20kg/㎡ is only 30dB, and the sound insulation performance is far from enough. In order to overcome the contradiction between light weight and high sound insulation, sandwich structure has become one of the effective measures of light sound insulation. As a special composite structure, carbon fiber honeycomb sandwich structure has the advantages of light weight, high strength, heat insulation and sound insulation, and has been widely used in many fields such as aerospace, aviation, rail transit, construction and so on.

Carbon fiber aluminum honeycomb structure is more and more used in aviation industry, high-speed train and automobile structure. In order to study its sound insulation performance has an important influence on the noise in the car and cabin, the researchers established a finite element model of carbon fiber aluminum honeycomb sandwich structure, and studied the influence of carbon fiber panel thickness, panel layer number, laying angle, aluminum honeycomb core layer thickness and aluminum honeycomb thickness on the sound insulation performance.

When the sound is transmitted to the wall of the honeycomb panel through the honeycomb panel structure, it will vibrate back and forth in each small honeycomb, which is equivalent to adding a multi-layer sound insulation board, and the consumption of sound energy will be relatively large. At the same time, for sound waves of a specific frequency, the honeycomb structure can prevent the sound waves from continuing to propagate, thereby achieving a good noise reduction effect.

When the panel adopts carbon fiber composite structure, it is less than 1000 In the low frequency band of Hz, the sound insulation performance of the aluminum honeycomb composite structure with the same panel thickness is lower than that of the aluminum honeycomb sandwich composite structure with all aluminum alloy materials, and the sound insulation trough with lower sound insulation will appear in the high frequency band. Compared with the aluminum alloy panel, the carbon fiber composite plate can not only realize the light weight of the overall structure, but also improve the sound insulation performance of the composite structure; with the increase of the thickness of the panel, the sound insulation performance of the composite structure increases, and the total thickness of the panel layer is unchanged, the single-layer panel or too many layers will reduce the sound insulation performance of the composite structure.