Carbon Fiber Aluminum Honeycomb Sandwich Composite Structures’ Sound Insulation Properties
Carbon fiber aluminum honeycomb sandwich composite structures are increasingly utilized in aviation and high-speed trains, where their sound insulation properties significantly affect interior noise levels.
Research has found that in the frequency range below 1000Hz, the sound insulation of the “carbon fiber composite panel + aluminum honeycomb core + carbon fiber composite panel” structure is inferior to that of the “aluminum alloy panel + aluminum honeycomb core + aluminum alloy panel” structure of the same size. Similarly, within 100~3150Hz, its weighted sound insulation is also lower than the aluminum alloy counterpart.
However, data suggests that increasing the thickness of the upper and lower panels can enhance the sound insulation of carbon fiber composite sandwich structures. Compared to traditional aluminum alloy sandwich structures, this not only achieves weight reduction but also improves sound insulation.
In summary, increasing the wall thickness of sandwich aluminum honeycomb structures can boost low-frequency sound insulation; as the honeycomb core layer thickens, sound insulation improves in the 100~630Hz range, and the sound insulation dip frequency gradually shifts towards higher frequencies, thereby enhancing low-frequency sound insulation.
