These adjustments correspond
to a suspension height of 3 cm from the low end stop, (minimum
height); the suspension seat adjusted in the middle of its
adjustment range (median height); and the suspension adjusted
at 3 cm from the maximum height achieved with maximum
pressure in the pneumatic bladder. The minimum and maximum
heights were decided in order to avoid end-stop impacts,
while providing some vibration attenuation (SEAT < 1). The
seat has been also tested for different horizontal seat adjustments
that are expected to be encountered during subway
operation: maximum displacement to the right (9 cm) with
clockwise rotation of 24 degrees and maximum displacement
to the left (9 cm) with no rotation. The vibration spectra have
been defined after extensive measurement in the Montreal subway1).
Table 1 gives a summary of the different conditions
that have been tested in the laboratory.