Division 4.2.13 Slipstream effects

The behaviour of a train with respect to slipstream effects on persons outside the train is characterised by the trackside forces created on passage of the trainset.

The sensor used is a dummy with the following characteristics:

A cylinder constituting a test body subjected to the slipstream effect with the following geometrical characteristics:

• cylinder frontal area: 0,36m² ± 0,05m²,

• cylinder height: 0,92 m ± 0,10 m,

• height of the pressure centre (cylinder centre) in relation to the base of the bearing device: 1,10 m ± 0,15 m,

• a device maintaining the cylinder in its measuring position at garage distance d_G,

• a measurement system.

Definitions:

Ve

test speed in km/h.

V_max

the anticipated operating maximum speed in km/h.

TT_max

maximal effort module for the whole trainset.

IT

trail index in N.

d_G

garage distance, or distance separating the outside model face (the closest to the rail) of the outside rail face.

It can be defined:

$$\mathrm{NM\; =}\frac{{\mathrm{TT}}_{\max }}{{\mathrm{Ve}}^2}$$

Then comes:

The reference values of the drag effect IT are defined as follows:

The interoperable trainsets have to respect:

• at the speed of 300 km/h,

• or in the maximal speed of the trainset if it is lower than 300 km/h,

IT value:

$${\mathrm{IT\; <\; or\; =\; 185\; Nat\; a\; distance\; d}}_g\mathrm{of\; 2\; m}$$