Vehicle Performance on Track
When judging the performance of a
high-speed vehicle on the track, it is ascertained that the following
requirements are fulfilled.
(a) At the
defective locations in the track, the variations in the vertical and lateral
wheel loads should not reach a level where the wheels can get derailed because
of the incidence of mounting.
(b) At
defective portions of the track, the variations in the vertical and lateral
wheel loads should not reach a level where they can lead to derailment as of a
result of the distortion to the track.
(c) It should
be ensured that the passengers are generally comfortable while the vehicle
plies on the track and that goods are carried without any damage.
(d) In the
case of diesel and electric locomotives, it is specified that a lateral force
lasting more than 2 m should not normally exceed 40% of the axle load plus 2 t.
The values of acceleration recorded in the cab at locations should, as far as
possible, be limited to 0.3g, both in the vertical and the lateral direction. A
peak value of 0.35g may be permitted in case the records do not indicate a
significant tendency of this value to be repeated. The ride index is calculated
for the purpose of comfort analysis, based on the lateral and vertical
acceleration values obtained from acceleration output graphs. The ride index
should normally not be greater than 4; a value of 3.75 is
preferred.
In the case of carriages, the
values of horizontal and lateral accelerations should generally not increase
beyond 0.3g, and an occasional value of 0.35g is permissible, as stipulated in
the case of locomotives. The value of the ride index should not increase to
3.5, though a value of 3.25 is preferred.
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