Open Access
Table 3
The seat and floor types with the estimated effective seat back rest heights* (the unobstructed part of the seat back rest) together with the calculated main dip frequencies** with effective seat backrest corresponding to λ/4, as well as the measured main attenuation dip frequencies*** for the floor and seat combinations.
| Floor type | Seat type (underpass) | Eff. back rest* (cm) | SDE calc.** (Hz) | SDE meas.*** (Hz) |
|---|---|---|---|---|
| Flat | Closed (0 cm) | 88 | 98 | 94–110 |
| 〃 | Open (10 cm) | 78 | 111 | 122–149 |
| 〃 | Open (24 cm) | 64 | 135 | 149–158 |
| Mod. raked | Closed (0 cm) | 78 | 111 | 94–99 |
| 〃 | Open (10 cm) | 78 | 111 | 109–111 |
| 〃 | Open (24 cm) | 64 | 135 | 145–158 |
| Steeply raked | Closed (0 cm) | 64 | 135 | 97–102 |
| 〃 | Open (10 cm) | 64 | 135 | 97–102 |
| 〃 | Open (24 cm) | 64 | 135 | 109–115 |
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