CEN/TR 17373:2019

Railway applications - Railway rolling stock - Investigation of vehicles position on the reverse curve tracks during running and calculation of buffer overlap

The purpose of this document is to analyse the conducted investigation and evaluation of lateral displacement and buffer overlap between each two specified vehicles of different train sets for defined running cases in curves.
For this purpose, the types of vehicles defining the train sets and different operating conditions are specified. Position of the vehicles on the track at the moment of maximum lateral displacement (minimum buffer overlap) is recorded during the calculation.
The worst cases of lateral displacement and buffer overlap between two coupled vehicles as well as relation to formulae in EN 15551:2009 are analysed.

Bahnanwendungen - Schienenfahrzeuge - Untersuchung der Fahrzeugstellungen im Gleis bei Durchfahrt von S-Bögen mit Ermittlung der Pufferüberdeckung

Applications ferroviaires - Synthèse des calculs de la largeur des tampons pour appareils de choc et traction

Železniške naprave - Železniška vozila - Ugotavljanje položaja tirnih vozil med vožnjo po tirnih protikrivinah in izračun prekrivanja odbojnikov

General Information

• Status: Published
• Publication Date: 17-Sep-2019
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: CEN/TC 256 - Railway applications
• Drafting Committee: CEN/TC 256/WG 33 - Coupling devices
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 18-Sep-2019
• Due Date: 20-May-2019
• Completion Date: 18-Sep-2019
• Directive: 2008/57/EC - Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)
• Mandate: M/483 - Mandate for programming and standardisation addressed to the European standardisation bodies under directive 2008/57/EC in the field of the interoperability of the rail system within the European Union
• Ref Project: SIST-TP CEN/TR 17373:2019 - Railway applications - Railway rolling stock - Investigation of vehicles position on the reserve curve tracks during running and calculation of buffer overlap

Overview

CEN/TR 17373:2019 - "Railway applications - Railway rolling stock - Investigation of vehicles position on the reverse curve tracks during running and calculation of buffer overlap" - is a CEN technical report that documents a systematic investigation into lateral displacement of coupled vehicles in S‑curves (reverse curves) and the resulting buffer overlap. The report compares measured and simulated vehicle positions at the instant of maximum lateral displacement (minimum buffer overlap), evaluates worst‑case scenarios, and examines the applicability of existing formulae in EN 15551:2009 and assumptions in UIC 527‑1.

Key Topics

• Scope and scenarios
  • Analysis of specified vehicle combinations and running cases in reverse curves (S‑curves).
  • Typical test conditions include v = 30 km/h at R = 150 m and v = 40 km/h at R = 190 m, with compressive forces of 0 kN and 200 kN to simulate braking/pushing.
• Vehicle types & configurations
  • Examples used in the report: Avmz and VTU coaches, BB27000 and Vectron locomotives, and freight wagons; three‑vehicle combinations and loco‑wagon sets.
• Vehicle dynamics and geometry
  • Definitions and calculation of lateral displacement components (dy), geometric overthrow (dg/F), coefficient of displacement (k), overhang and length over buffer (LoB).
• Buffer overlap calculation
  • Determination of minimum half‑width of buffer heads and verification methods.
  • Comparison of formulae from EN 15551:2009 and UIC 527‑1 (noting historical discrepancies between language versions and differing assumptions on internal lateral play).
• Methodologies
  • Use of drawing methods, simplified formulae (derived from UIC 527‑1), and multi‑body dynamic simulation (examples with SIMPACK and other tools) to determine vehicle positions and buffer overlap.
• Results analysis
  • Identification of worst‑case lateral displacements and relationship to buffer head geometry and overlap risk.

Applications

• Useful for vehicle designers, rolling stock engineers, safety assessors, infrastructure managers and standards writers who need to:
  • Validate buffer head width and buffer overlap requirements for safe coupling and to avoid buffer locking during curve negotiation.
  • Assess interoperability and conformity with EN 15551 and UIC recommendations when operating in reverse curves.
  • Inform vehicle acceptance tests, design reviews, and risk assessments involving S‑curve dynamics.
  • Implement multi‑body simulation studies to predict lateral displacement and optimize buffer geometry.

Related Standards

• EN 15551:2009 - (Referenced in the report for buffer head width formulae and verification)
• UIC 527‑1 - (Assumptions on internal lateral play and historic formulae; discrepancies between versions are discussed)

Keywords: CEN/TR 17373:2019, buffer overlap, railway rolling stock, reverse curve, S‑curve, lateral displacement, EN 15551, UIC 527‑1, buffer head width, multi‑body simulation, SIMPACK.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2019
Železniške naprave - Železniška vozila - Ugotavljanje položaja tirnih vozil med
vožnjo po tirnih protikrivinah in izračun prekrivanja odbojnikov
Railway applications - Railway rolling stock - Investigation of vehicles position on the
reserve curve tracks during running and calculation of buffer overlap
Bahnanwendungen - Schienenfahrzeuge - Untersuchung der Fahrzeugstellungen im
Gleis bei Durchfahrt von S-Bögen mit Ermittlung der Pufferüberdeckung
Applications ferroviaires - Synthèse des calculs de la largeur des tampons pour appareils
de choc et traction
Ta slovenski standard je istoveten z: CEN/TR 17373:2019
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TR 17373
TECHNICAL REPORT
RAPPORT TECHNIQUE
September 2019
TECHNISCHER BERICHT
ICS 45.060.01
English Version
Railway applications - Railway rolling stock - Investigation
of vehicles position on the reverse curve tracks during
running and calculation of buffer overlap
Applications ferroviaires - Synthèse des calculs de la Bahnanwendungen - Schienenfahrzeuge -
largeur des tampons pour appareils de choc et traction Untersuchung der Fahrzeugstellungen im Gleis bei
Durchfahrt von S-Bögen mit Ermittlung der
Pufferüberdeckung
This Technical Report was approved by CEN on 26 May 2019. It has been drawn up by the Technical Committee CEN/TC 256.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 17373:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols and abbreviations . 6
5 Boundary conditions . 7
6 Vehicle dynamic . 10
6.1 Coefficient of displacement k . 10
6.2 Geometric overthrow dg or F . 11
6.3 Location of the vehicle in the track and displacement dy . 12
p
6.4 Position of the vehicles in the S-curve . 13
6.4.1 Bogie vehicles . 13
6.4.2 Other vehicles . 14
7 Calculation of the displacement of the vehicle body centre (dy ) — Δdy calculated
p p
with UIC 527-1 assumptions . 15
7.1 General . 15
7.2 Basic vehicle . 16
8 Determination of the minimum half width of the buffer head . 16
8.1 Calculation (simplified formula derived from UIC 527-1) . 16
8.2 Verification . 18
8.2.1 General . 18
8.2.2 Drawing methodology with UIC 527-1 assumptions . 18
8.2.3 Simulation methodology . 18
9 Comparison of the values . 20
10 Buffer overlap of investigated vehicles . 20
11 Summary . 21
Annex A (informative) Position of the vehicles on the track calculated and compared with
estimation according to UIC 527-1 assumption . 23
Annex B (informative) Drawing methodology — Examples . 27
Annex C (informative) Multi-body simulation methodology — Examples . 34
C.1 General . 34
C.2 Multi-body simulation by Siemens . 34
C.3 Multi-body simulation by SNCF . 45
Annex D (informative) Remark about the buffer head geometry and buffer overlap . 52
Bibliography . 57

European foreword
This document (CEN/TR 17373:2019) has been prepared by Technical Committee CEN/TC 256
“Railway applications”, the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Introduction
During CEN/TC 256/SC 2/WG 33/SG 2 meetings for the writing of the European Standard EN 15551,
SNCF presented its experience about derailments in the space of time from 1976 to 1982 due to
insufficient buffer overlap and proposed to modify the formulae written in EN 15551:2009, Annex J to
make greater the width of buffer heads sufficient for safety operation service. The formulae SNCF
proposed, based on the former assumptions acc. UIC-leaflet from January 1964, simply takes into
account the maximal own play of the vehicles, instead of the 5 mm value given in UIC 527-1:2005, 3.2.2
and EN 15551:2009, K.6. Indeed, this 5 mm value is a realistic value for freight wagons but not for other
types of vehicles. Regarding the modification of the formulae proposed by SNCF the other members of
W 33 pointed out that:
— it is not possible to increase the internal half width of the buffer head over the limits specified by
UIC 527-1:2005, Annex A and EN 15551:2009, 6.2.2;
— since 1965 there have been two language versions of UIC 527-1, a French version and a German
version, and they have the following discrepancy in the formulae for calculation of the width of
buffer head:
— UIC 527-1 French version: calculates the half width of the buffer head with different formulae
for vehicles with running bogies (e.g. coaches, wagons) or with power bogies (e.g. locomotives,
power heads and motor vehicles). Thus, the width of the buffer head calculated for vehicles
with power bogies will be greater than the width of the buffer head calculated for vehicles with
running (non-power) bogies;
— UIC 527-1 German version: calculates the half width of the buffer head with the same formulae
for all types of bogie vehicles, namely: for vehicles with running bogies as well as for vehicles
with power bogies.
— No cases of buffer locking due to an insufficient dimensioning of buffer width (with consequently
insufficient buffer overlap) were really noticed in Germany, whereas also in German speaking
countries the UIC 527-1 formulae in the German version have been used for decades to dimension
the buffer heads width.
— The geometry of the outside half width of buffer heads (opposite to vehicle centre line) of SNCF
derailed coaches have had a circular shape geometry that reduced the buffing surface in Geometry
specified in UIC 527-1:2005, Annex A).
In order to develop a uniform methodology for the calculation of the width of buffer heads, WG 33
decided to create an ad hoc group whose mission was to analyse, by means of realistic simulations,
realized with the multi-body Software SIMPACK, if the formulae, written in the standard
EN 15551:2009, Annex J, provide the width of buffer head enough for required minimum buffer overlap
and what the domain of use of these formulae was.
This document presents the work made by the WG 33 Ad hoc group and the conclusions of this Group.
The investigation is conducted for specified vehicles in different vehicle combinations (train sets) for
defined running cases in curves.
The purpose of this investigation is evaluation of following parameters:
— lateral displacement of coupled vehicles on the track;
— lateral displacement of coupled vehicles to each other;
— buffer overlap between two specified coupled vehicles with given buffers.
For this purpose, the types of vehicles defining the train sets and different operational conditions are
specified. Position of the vehicles on the track at the moment of maximum lateral displacement to each
other (minimum buffer overlap) is recorded.
The worst cases of lateral displacement and buffer overlap between two coupled vehicles as well as
relation to UIC 527-1 and EN 15551 formulae are analysed.
1 Scope
The purpose of this document is to analyse the conducted investigation and evaluation of lateral
displacement and buffer overlap between each two specified vehicles of different train sets for defined
running cases in curves.
For this purpose, the types of vehicles defining the train sets and different operating conditions are
specified. Position of the vehicles on the track at the moment of maximum lateral displacement
(minimum buffer overlap) is recorded during the calculation.
The worst cases of lateral displacement and buffer overlap between two coupled vehicles as well as
relation to formulae in EN 15551:2009 are analysed.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Symbols and abbreviations
Symbol Designation Unit
Distance between end wheelsets of vehicles not fitted with bogies or
a mm
between bogie centres
dg
Geometric overthrow of the vehicle on the outside of the curve mm
a
dg
Geometric overthrow of the vehicle on the inside of the curve mm
i
Distance from the centre line of the buffer to the contact point at the
dy
mm
i
buffer head, index 1, 2 in accordance to the vehicle number
dy
Distance between the centre lines of the 2 buffers mm
p
Geometric overthrow of the vehicle on the outside of the curve for car
F mm
body pivots on the track centre line
F
Compressive force with buffers in contact kN
BC
Compressive force simulates the forces which occur on the vehicles
F
kN
LC
during braking or pushing operation
Own lateral play (internal lateral displacement) of the vehicle (j1) in
j1 mm
secondary suspension
j2 Lateral play in primary suspension mm
j3 Lateral play of the wheelset in a track mm
Symbol Designation Unit
k Coefficient of lateral displacement of the vehicle on the track —
l Track gauge, distance between the rail running edges mm
l
Nominal track gauge mm
nom
LoB Length over buffer mm or m
Distance from the section under consideration to the adjacent end
n mm
wheelset or the closest bogie centre or bogie pivot
Overhang, distance from buffer face to the closest singular wheelset or
n
mm
a
closest bogie centre
n
n for the sections between the wheelsets or bogie centres mm
i
p Bogie wheelbase mm
R Horizontal curve radius mm or m
R
Horizontal curve radius, left curve mm or m
LC
R
Horizontal curve radius, right curve mm or m
RC
v Vehicle speed m/s or km/h
5 Boundary conditions
The configurations and scenarios studied are described in Table 1 and Table 2.
Table 1 — Boundary conditions
v = 30 km/h constant for R = 150 m
Velocity
v = 40 km/h constant for R = 190 m
R 150 m — 6,79 m — R 150 m gauge 1 470 mm
Track
R 190 m — 0 m — R 190 m gauge 1 458 mm
Number of vehicles 3
Vehicle st
1 class intercity “Avmz”
DB 3 times the same type
configuration
Avmz – Avmz - Avmz
VTU coaches
SNCF 1 3 times the same type
VTU – VTU – VTU
Loco BB 27000 + 2 freight wagons (FW)
SNCF 2 (FW, length over buffers, LoB = 18 m, a = 12 m)
Loco + Loco + coach
2 Loco (Vectron) + coach (UIC-type)
Siemens
Loco + Loco + coach
F = 0 kN = const
LC
Compressive force
a
between vehicles
F = 200 kN = const
LC
Screw coupler nominal case (N) degraded case (D)
tightening
— for locomotives Dimension in millimetre
or wagons
— for coaches
Buffers in contact
— 2 turns before contact with nuts
— Specific rules (SNCF)
a
The compressive force simulates the forces which occur on the vehicles during braking or pushing operation.
In Table 2, the configurations of the coupled vehicles studied are indicated by the sign “X”. The
additional scenarios indicated by a footnote “a” for the “worst case” are the “special” cases where it is
assumed that higher requirements might occur and the calculation of the buffer head width in
accordance with the specified formulae are not valid for all vehicles.
Table 2 — Configuration of coupled vehicles
Screw 0 kN 0 kN 200 kN 200 kN
Operator/
Vehicle configuration coupler R 150 m R 190 m R 150 m R 190 m
Manufacturer
tightening v = 30 km/h v = 40 km/h v = 30 km/h v = 40 km/h
N X X X X
DB 3 coaches “Avmz”
a
D
X
2 locomotives + 1 UIC N X  X
coach
Siemens
Locomotive = Siemens
a
D
X
Vectron
N X X X X
SNCF 1 3 coaches “VTU”
a
D
X
1 locomotive N   X
SNCF 2 + 2 freight wagons
a
D
X
locomotive = BB27000
Key
N = nominal case, see Table 1, Screw coupler tightening
D = degraded case, see Table 1, Screw coupler tightening
X = configuration to be calculated/simulated
a
Classified as "worst case"
As specified by the previous tables (Table 1 and Table 2), the two following parameters are taken into
account, because they are considered as the most influential ones:
— Screw coupler tightening;
— Compressive force (as a reaction to the braking or pushing mode).
In order to compare the results between the calculations from the group members, a uniform
coordinate system for the analysis of output data was determined. This coordinate system is defined in
accordance with 3-finger rule of the right hand, where “x” follows the track in running direction of the
train set, and it is shown in Figure 1.

Key
v velocity of the train set
train
R radius, left curve
LC
Figure 1 — Coordinate system
It is also necessary to fix of the variables to be registered. The following scheme presents the variable
names for vehicle 1 (i is the position of the bogies: i = 1 is the first bogie entering in the S-curve).

Key
v
velocity of the train set
train
l track gauge: 1 470 mm
1 vehicle body
2 vehicle body centre line
3 track centre line
x, y axis of the coordinate system
wheelset
bogie pivot
own play of the vehicle body on the bogie (j1): Example: j1 , j1

i i1+
play of the wheelsets in a track (j3): Example: jj3 ,, 3' 3j , 3'j

i i i1+ i1+
NOTE 1 i is the position of the bogie: i = 1 is the first bogie entering in the S-curve
NOTE 2 ' indicates the second wheelset of the bogie
NOTE 3 The play j2 (bogie internal to primary spring) is neglected.
Figure 2 — Visualization of the names of analysed parameters
6 Vehicle dynamic
6.1 Coefficient of displacement k
The lateral displacement of the wheelsets in the track (j3) is different for the bogie vehicles and other
vehicles. Thus, there are two formulae for the calculation of the coefficient “k” for the position of the
wheelsets of the bogies in the curve, see Figure 3.
na+
a
(1)
k=
a
a) Bogie vehicles
2⋅+na
a
(2)
k=
a
b) All other vehicles
Key
a is the distance, in mm, between end wheelsets or bogie pivots of the vehicle concerned;
n is the overhang, in mm, of the buffer face in relation to the end wheelsets or bogie pivot;
a
k is the coefficient of displacement of the vehicle in the track.
Figure 3 — Coefficient k for bogie vehicles and other vehicles
6.2 Geometric overthrow dg or F
For the definition of the Geometric overthrow (dg), see Figure 4.
an − n
ii
(3)
dg =
i
2R
an − n
α α
(4)
F≡ dg =
α
2R
a) dg of the vehicle on a curved track

p
(5)
dg =
i
8R
b) dg of the bogie on a curved track
i
Figure 4 — Geometric overthrow dg
6.3 Location of the vehicle in the track and displacement dy
p
The displacement of the centre lines of the two buffers dy to each other is the main parameter to be
p
analysed and it is approximately the shortest distance between the two centre lines (see Figure 5,
item 1 and item 2).
Key
dy distance between the centre lines of the two buffers
p
dy distance from the centre line of the buffer to the contact point at the buffer head of vehicle 1
dy distance from the centre line of the buffer to the contact point at the buffer head of vehicle 2
1 vehicle body centre line of vehicle 1
2 vehicle body centre line of vehicle 2
3 track centre line
Figure 5 — Scheme of displacement of vehicle body centre line in a S-curve
6.4 Position of the vehicles in the S-curve
6.4.1 Bogie vehicles
Figure 6 shows the position of bogie vehicles in S-curve.
Key
v velocity of the train set and running direction
train
1 vehicle body centre line of vehicle 1
2 track centre line
3 vehicle body centre line of vehicle 2
4 wheelsets 30 mm outside from the centre line of the track
5 first wheelset in running direction 30 mm outside from the centre line of the track; second wheelset
30 mm inside from the centre line of the track
n is the overhang, in mm, distance from the buffer face to the bogie pivot
a
a is the distance, in mm, between bogie pivots of the vehicle concerned
own play of the vehicle (j1)
play of the wheelset in the track (j3)

Figure 6 — Position of the vehicles in the S-curve for bogie vehicles
6.4.2 Other vehicles
Figure 7 shows the position of other vehicles in S-curve, e.g. vehicles with two singular wheelsets.
Key
v velocity of the train set and running direction
train
1 vehicle body centre line of vehicle 1
2 track centre line
3 vehicle body centre line of vehicle 2
4 wheelset 30 mm outside from the centre line of the track
5 wheelset 30 mm inside from the centre line of the track
n is the overhang, in mm, distance from the buffer face to the end
a
wheelsets
a is the distance, in mm, between end wheelsets of the vehicle concerned
own play of the vehicle (j1)
the play of the wheelset in the track (j3)

Figure 7 — Position of the vehicles in the S-curve for other vehicles
7 Calculation of the displacement of the vehicle body centre (dy ) — Δdy
p p
calculated with UIC 527-1 assumptions
7.1 General
The formulae written in UIC 527-1 and in EN 15551:2009, Annex J, come from a study described by UIC
Document [6] from January 1964 and are covered in UIC 527-1.
The formulae calculate the minimum half width of buffer heads so that the overlap of the buffers of any
two vehicles running on a given S-curved track is not less than that of the buffers of two so-called
“basic” vehicles running under the same conditions. The work of the UIC group from 1964 was divided
into four stages:
1) Definition of a basic vehicle;
2) Determination of the tracks where two basic vehicles shall ensure the safe running without buffer
locking (minimal straight line between two curves);
3) Determination of the minimum safe buffer width for any vehicles (input data are the dimensions of
the vehicles);
4) Consideration about lateral plays (displacements), such as:
— own play – internal lateral displacement of the vehicle;
— play of the wheelsets on the track.
The created formulae assumed a corresponding singular position of two coupled consecutive vehicles
on a track. It also distinguished the type of vehicle (bogie vehicles and other vehicles).
The formulae in UIC 527-1 and in EN 15551:2009, Annex J calculate the minimum half width of buffer
heads for vehicles in S-curve of R 150 m —6 m — R 150 m with track gauge of 1 470 mm as a worst
case.
7.2 Basic vehicle
The basic vehicle is described by the following criteria:
— minimum horizontal overlap of 25 mm of two buffer heads in contact, with vehicles running on
tracks;
— distance between end wheelsets or bogie pivots: a = 12 m;
— overhang distance between buffer face and the singular end wheelset or bogie pivot: n = 3 m;
a
— own play of the vehicle: j1 = 5 mm;
— play of the wheelsets on a track 1 470 mm wide j3 = 30 mm.
Track
8 Determination of the minimum half width of the buffer head
8.1 Calculation (simplified formula derived from UIC 527-1)
Figures 3 to 7 show the position of the vehicles in an S-curve.
 
∆
The minimum of the half width buffer head , taking into account the vehicle geometry, according to
 
 
Formulae (1), (2), (4), and (5), is determined according to the respective Formulae (6) to (8) valid for
the respective areas, which are schematically shown in Figure 8 as function versus a. The
an+
( )
a
∆
i
Figure 8 explains the index of 1 to 3 of .
Figure 8 — Areas where Formula (6) to Formula (8) are valid for
Depending on the maximum of the geometrical overthrow (F) and the distance between the end
wheelsets or bogie pivots of the vehicle (a) and/or the overhang (n ), the minimum the half width of
a

∆
i
the buffer head  will be calculated by one of Formula (6) to Formula (8) as a guiding value for

 
R = 150 m and with 30 mm lateral clearance between the track and wheelset each side.
∆
p
= 30k+−130 , in mm if F ≤ 150 mm and (a + n ) ≤ 15 000 mm (6)
a
2 1 200 000
∆
p
=Fk+ 30−−20 , in mm if F ≥ 150 mm and n ≥ 3 000 mm (7)
a
2 1 200 000
if (a + n ) > 15 000 mm and n < 3 000 mm:
a a
 
2 a
3 000−+n  1
( )
a
 
an+− 15 000 n
∆
∆ ( ) ∆
a a
3 1 2  
=+=+ , in mm (8)
22 2
   
aa
300 000 −−4 60 000 4
   
nn
aa
   
where
p is the bogie wheelbase (P = 0 for 2 wheelset vehicles, see also Figure 4 b).
In the formulae, the play of the wheelsets in a track (j3) and the own play of the vehicle (j1) are fixed:
— j3 = 30 mm;
— j1 = 5 mm.
With the previous hypothesis in terms of vehicle position in the track and play, it is possible to estimate
dy on the basis of UIC 527-1 assumptions for any coupled vehicles.
p
8.2 Verification
8.2.1 General
The values dy on the basis of UIC 527-1 for the train set configurations, detailed in Tables 1 and 2, were
p
investigated by CAD drawings.
NOTE The internal displacement j1 on each vehicle on both bogies are always considered in the same
direction, namely outside of the corresponding curve.
Relation between buffer width and the vertical displacement of buffers to each other, is presented in
Annex D.
8.2.2 Drawing methodology with UIC 527-1 assumptions
Investigation of the distance dy between the centre lines of two vehicles on the track with assumptions
p
according to UIC 527-1 for the same boundary conditions as SIMPACK simulation were conducted.
Boundary conditions are as following:
— S-curve with intermediate straight line: R 150 m — 6,79 m — R 150 m;
— Track clearance to wheelset (each side): 30 mm;
— Own lateral play each vehicle body on the bogies: 5 mm.
The results of the drawing investigation are presented in Table 3.
The results of the drawing investigation compared to results of multi-body simulation, are presented in
Annex A.
An example of the drawing methodology is presented in Annex B.
Table 3 — Result dy estimated by CAD drawing based on UIC 527-1 assumptions
p
Coach Avmz Coach VTU Loco BB27000 Loco Vectron Loco Vectron
No Configuration + + + + +
Coach Avmz Coach VTU "basic" wagon Coach UIC Loco Vectron
a
1 dy , in mm 476 516 312 421 358
p
b, c
2 dy , in mm 558 600 403 512 458
p
a
Obtained for vehicles in the track centre line, with geometrical overthrow without lateral displacement (for information
only).
b
Obtained with UIC 527-1 assumptions.
c
Estimated by CAD drawing with j1 = 5 mm and j3 = 30 mm.
The values in grey cells are taken into account for comparison with results of the
...