This Standard covers the requirements for random vibration and shock testing items
of mechanical, pneumatic, electrical and electronic equipment/components (hereafter
only referred to as "equipment") to be fitted on to railway vehicles. Random vibration
is the only method to be used for equipment/component approval.
The tests contained within this Standard are specifically aimed at demonstrating
the ability of the equipment under test to withstand the type of environmental vibra-
tion conditions normally expected for railway vehicles. In order to achieve the best
representation possible, the values quoted in this Standard have been derived from
actual service measurements submitted by various bodies from around the world.
This Standard is not intended to cover self-induced vibrations as these will be spe-
cific to particular applications.
Engineering judgement and experience is required in the execution and interpre-
tation of this Standard.
This Standard is suitable for design and validation purposes; however, it does not
exclude the use of other development tools (such as sine sweep), which may be used
to ensure a predetermined degree of mechanical and operational confidence. To as-
sist product design for compliance with this Standard, guidance is given in Annex B
which allows comparison with alternative design methods.
The test levels to be applied to the item under test and dictated only by its loca-
tion on the train (i.e. axle, bogie or body-mounted).
It should be noted that these tests may be performed on prototypes in order to gain
design information about the product performance under random vibration. However,for attestation of testing purposes the tests have to be carried out on equipment taken
from normal production.
This Standard specifies the requirements for testing items of equipment intended
for use on railway vehicles which are subsequently subjected to vibrations and shock
owing to the nature of railway operational environment. To gain assurance that the
quality of the item is acceptable, it has to withstand tests of reasonable duration that
simulate the service conditions seen throughout its expected life.
Simulated long-life testing can be achieved in a number of ways each having their
associated advantages and disadvantages, the following being the most common:
a) amplification: where the amplitudes are increased and the time base decreased;
b) time compression: where the amplitude history is retained and the time base is
decreased;
c) decimation: where time slices of the historical data are removed when the am-
plitudes are below a specified threshold value.