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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