Ordinary aluminum honeycomb panel is a layered composite structure composed of two thin aluminum plates and a lightweight aluminum honeycomb core material bonded by adhesive. The middle aluminum honeycomb core material is a regular hexagonal honeycomb hole, with a side length of 8mm and a material thickness of 0.08mm. , height 18mm.
The new aluminum honeycomb panel consists of a micro-perforated aluminum panel, a perforated aluminum panel non-woven fabric and an aluminum honeycomb core material. The thickness of the micro-perforated aluminum plate in the test piece is 1mm, the shape of the hole is an isosceles right triangle, the length of the hypotenuse is 0.4mm, the center distance of the hole is 2.2mm, the perforation rate is 0.65%, and the back surface of the plate is pasted with a thickness of 0.2mm and a density of 40g. /㎡ non-woven porous sound-absorbing material. The thickness of the perforated aluminum plate in the test piece is 1mm, the diameter of the hole is 2.5mm, the distance between the center of the hole is 4.5mm, and the perforation rate is 23.8%. The middle aluminum honeycomb core material is the same as the ordinary aluminum honeycomb panel.
According to the sound absorption coefficient curve, the measured noise reduction coefficient of the new aluminum honeycomb panel is 0.63, and the noise reduction coefficient of the ordinary aluminum honeycomb panel is 0.17. It is generally considered that materials with a noise reduction coefficient less than 0.2 are reflective materials. It can be seen that the noise reduction effect of the new aluminum honeycomb panel is much better than that of the ordinary aluminum honeycomb panel. The simulation noise reduction coefficient of the new aluminum honeycomb panel is 0.64, which is basically consistent with the measured results, and the simulation degree is high.