Open Access
Table 2
Summary of experimental results.
| Parameter | Variable value | Absorption coefficient or performance description |
|---|---|---|
| Porosity/% | 75 | Absorption coefficient gradually increases, but with low effectiveness |
| 85 | Further improvement in absorption coefficient | |
| 95 | Optimal absorption effect, significant increase in low-frequency absorption coefficient | |
| Thickness/mm | 5 | Low absorption coefficient |
| 8 | Increased absorption coefficient, shifted towards lower frequencies | |
| 11 | Optimal absorption effect, multiple absorption peaks appear | |
| Density/(kg/m3) | 0.15 | Second absorption valley frequency f3 is higher |
| 0.25 | f3 shifts towards lower frequencies | |
| 0.35 | f3 continues to shift towards lower frequencies, but with insignificant change | |
| Size/mm | 16 | Good absorption effect |
| 21 | Decreased absorption performance | |
| 26 | Significantly reduced absorption performance | |
| Tension force/(N/m) | 110 | Lower characteristic frequency |
| 130 | Characteristic frequency shifts towards higher frequencies | |
| 160 | Highest characteristic frequency, significant impact | |
| Young’s modulus/Pa | 3.5e9 | Sound insulation peak at 30 Hz |
| 2.1e9 | Sound insulation peak shifts towards lower frequencies | |
| 1.1e9 | Sound insulation peak moves to 110 Hz, reduced bandwidth | |
| Poisson’s ratio | 0.25 | Low-frequency attenuation signal absorption curve slightly shifts towards lower frequencies |
| 0.35 | Curves almost coincide, peak at 65 dB | |
| 0.45 | Curve continues to shift towards higher frequencies, but with insignificant change | |
| Frame material | Photosensitive Resin | Slightly lower sound insulation compared to other materials |
| Aluminum | Slightly higher sound insulation than photosensitive resin | |
| Steel | Slightly higher sound insulation, but with overall minor impact | |
| Mass Block Contact Area with Membrane/mm2 | 3.5 | Low absorption effect |
| 4.5 | Improved absorption effect | |
| 5.5 | Optimal absorption effect |
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