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To detect problems by on board staff and passengers The estimated
rate of non-detection of a hot axle box by passengers and by on-board staff
( OBS ) is represented by equation 3.
NP×PIQ
RDH OBS =(
RDH PA )
+
RDH CPA
(3)
10 1 /h.
- Taking into account a high speed train with all seats taken (377 seats)
and 8 wagons: NP =
- Assuming a low passenger attention: RDH PA =
5
.
= 47.
- Assuming that 25% of passengers will want to alert a member of the crew
and 12,5% (1 in 8 cars) will find one: PIQ =
377 ÷ 8
= 0,03125.
- Assuming a low procedural action by the crew: RDH CPA =
0
,
25 × 0
,
125
10 2 /h.
5
.
10 1 /h.
The result is RDH OBS =
4
,
1
.
To monitor axle boxes by STEM agents The estimated rate of non-
detection of a hot axle box by STEM agents is represented by equation 4.
NA
RDH STEMA
SAQ
RDH STEM =(
)
(4)
- Assuming an average attention of STEM agents to trac safety:
RDH STEMA =
10 2 /h.
- Assuming that 20% of the work of the STEM agents is devoted to trac
safety: SAQ = 0,20.
- Assuming that there is, at least, one agent available: NA =1.
5
.
10 1 /h.
The result is RDH STEM =
2
,
5
.
To monitor axle boxes by on track HBD The estimated rate of non-
detection of a hot axle box for high speed trains with on track HBD is rep-
resented by equation 5.
NFT
Factor ×
1
RDH HBD−Track =
(5)
(1
I 0 −HBD ) ×
h DBC ×
NB HBD
- There is currently NB HBD = 106 on track HBD on the French network,
it can be estimated that there is a HBD every 35,49 kms.
- Number of failures tolerated per year ( NFT )=1.
- A risk aversion factor of HBD for high-speed lines: Factor = 15.
- Unavailability of HBD ( I 0 −HBD )=
10 3 .
3
,
96
.
- Hours of operation: h DBC =18 × 333
= 5994 h/year (18 hours per day
during 333 days per year).
10 7 /h.
The result is RDH HBD−Track =
1
,
05
.
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