oSIST prEN 12299:2023
(Main)Railway applications - Ride comfort for passengers - Measurement and evaluation
Railway applications - Ride comfort for passengers - Measurement and evaluation
The purpose of this document is to provide methods for quantifying the ride comfort of a passenger in a rail vehicle in response to the track sections it is operated over.
The methods aim to quantify the effects of vehicle body motions on ride comfort and to make the assessment of passenger comfort predictable, repeatable, objective and meaningful.
The methods and comfort scales are validated for people of good health.
This document applies to passengers in rail vehicles operating on heavy rail networks.
This document may also be used as a guide for example on urban rail systems, but their operational routes/environments may make it difficult to comply with the requirements of the test methods.
This document applies to measurements of motions. It also applies to simulated motions. Guidance is provided on:
- which method described within the document should be used for different scenarios;
- typical values for different comfort levels;
- the application of simulation.
This document excludes health and safety issues, non-passenger carrying vehicles, vehicle homologation and safety, limit values, motion sickness, discomfort caused by accelerating and braking, design guidelines and measurement technology.
Bahnanwendungen - Fahrkomfort für Fahrgäste - Messung und Auswertung
Diese Europäische Norm legt Methoden zur Bewertung der Auswirkungen von Bewegungen des Wagenkastens auf den Fahrkomfort für die Fahrgäste und für die Fahrzeugbemessung fest.
Die hier betrachteten Auswirkungen sind:
- Unannehmlichkeiten in Verbindung mit relativ kleinen Beschleunigungen und Rollgeschwindigkeiten.
Andere Einflüsse in Zusammenhang mit höheren Beschleunigungspegeln sind nicht in dieser Norm erfasst:
- Gesundheitsrisiko: körperliche Behinderung und psychische Störung.
Der Anwendungsbereich ist auf den öffentlichen Eisenbahnverkehr beschränkt, die Norm umfasst Schienenfahrzeuge, die zur Beförderung von Fahrgästen ausgelegt sind, einschließlich Neben- und Vorortstrecken. Sie kann aber auch als Leitfaden für andere Eisenbahnfahrzeuge, z. B. Lokomotiven, U Bahnen und Straßenbahnen usw. verwendet werden.
Diese Norm bezieht sich auf Fahrgäste, die sich in einem gesundheitlich guten Allgemeinzustand befinden.
Sie gilt für Bewegungsmessungen, kann aber auch für Simulationen angewendet werden
Applications ferroviaires - Confort de marche des voyageurs - Mesurage et évaluation
La présente Norme européenne spécifie des méthodes de détermination des effets des mouvements de la caisse sur le confort de marche des voyageurs et d’évaluation du véhicule du point de vue du confort de marche. L’effet considéré est :
- l’inconfort, lié à des niveaux d’accélération et une vitesse de roulis relativement faibles.
Les autres effets, non couverts par la présente norme, sont liés à des niveaux d’accélération plus élevés :
- risques pour la santé : Dommages physiques et psychologiques.
L’objet de la présente norme se limite au service ferroviaire public ; la norme concerne les véhicules ferroviaires de transport de voyageurs sur des lignes ferroviaires, incluant les lignes secondaires et les lignes de banlieue. Le présent document peut toutefois être utilisé comme guide pour d’autres véhicules ferroviaires comme par exemple les locomotives, les métros, les tramways, etc.
La norme s’applique à des voyageurs en bonne santé.
La présente norme s’applique aux mesurages des mouvements, mais elle peut également être utilisée pour des simulations.
Železniške naprave - Udobnost vožnje potnikov - Meritve in vrednotenje
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2023
Železniške naprave - Udobnost vožnje potnikov - Meritve in vrednotenje
Railway applications - Ride comfort for passengers - Measurement and evaluation
Bahnanwendungen - Fahrkomfort für Fahrgäste - Messung und Auswertung
Applications ferroviaires - Confort de marche des voyageurs - Mesurage et évaluation
Ta slovenski standard je istoveten z: prEN 12299
ICS:
13.160 Vpliv vibracij in udarcev na Vibration and shock with
ljudi respect to human beings
45.060.20 Železniški vagoni Trailing stock
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2022
ICS Will supersede EN 12299:2009
English Version
Railway applications - Ride comfort for passengers -
Measurement and evaluation
Applications ferroviaires - Confort de marche des Bahnanwendungen - Fahrkomfort für Gäste - Messung
voyageurs - Mesurage et évaluation und Auswertung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12299:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols, units and abbreviations . 9
5 General description. 13
5.1 General. 13
5.2 Passenger exposure to vibrations . 13
5.3 Application . 14
5.4 Characteristics of rail vehicle motions . 14
5.5 Ride comfort . 15
5.6 Direct and indirect measurements . 15
5.7 Summary table of procedures . 15
5.8 Application of comfort indices . 16
6 Mean comfort and continuous comfort . 17
6.1 General. 17
6.2 Basis of the method . 18
6.3 Methodology . 18
6.4 Test conditions . 18
6.4.1 General. 18
6.4.2 Selection of test sections . 19
6.4.3 Test speed . 19
6.4.4 Wheel-rail contact geometry . 19
6.4.5 Vehicle condition . 19
6.5 Parameters to be measured . 19
6.5.1 General. 19
6.5.2 Location of measuring points . 19
6.5.3 Filtering . 20
6.6 Definition of intermediate quantities . 20
6.6.1 Symbols and indices . 20
6.6.2 Rms-values of weighted accelerations . 22
6.6.3 95th and 50th percentiles . 22
6.7 Definition of comfort indexes . 23
6.7.1 Continuous comfort. 23
6.7.2 Mean comfort standard method . 23
6.7.3 Mean comfort complete method . 23
6.8 Test report . 23
7 Comfort on Curve Transitions . 24
7.1 General. 24
7.2 Basis of the method . 24
7.3 Methodology . 24
7.4 Test conditions . 25
7.4.1 General. 25
7.4.2 Selection of test sections . 25
7.4.3 Test speed . 25
7.4.4 Wheel-rail contact geometry . 25
7.4.5 Vehicle condition . 25
7.5 Parameters to be measured . 25
7.5.1 General . 25
7.5.2 Location of measuring points . 26
7.5.3 Filtering . 26
7.6 Definition of intermediate quantities . 26
7.6.1 Symbols and indices . 26
¨
7.6.2 y Averaging procedure . 26
1s
max
7.6.3 Identification of transition periods. 27
7.6.4 Intermediate quantities . 27
7.7 Definition of comfort index P . 27
CT
7.8 Alternative comfort index ‘sliding P over 3 s’ . 28
CT
7.9 Test report . 29
7.10 Example diagrams . 29
8 Comfort on Discrete Events . 31
8.1 General . 31
8.2 Basis of the method . 31
8.3 Methodology . 31
8.4 Test conditions . 32
8.4.1 General . 32
8.4.2 Selection of test sections . 32
8.4.3 Test speed . 32
8.4.4 Wheel-rail contact geometry . 32
8.4.5 Vehicle condition . 32
8.5 Parameters to be measured . 32
8.5.1 General . 32
8.5.2 Location of measuring points . 32
8.5.3 Filtering . 33
8.6 Definition of intermediate quantities . 33
8.6.1 Symbols and indices . 33
8.6.2 Averaging procedure . 33
8.6.3 Intermediate quantities . 33
8.7 Definition of comfort index P . 34
DE
8.8 Test report . 34
9 Guide for the interpretation of the results . 35
9.1 General . 35
9.2 Mean comfort . 35
9.3 Continuous comfort . 35
9.4 Comfort on curve transitions . 36
9.5 Comfort on discrete events . 36
Annex A (normative) Reference system . 38
Annex B (normative) Measurement techniques . 40
B.1 General . 40
B.2 Measuring equipment . 40
B.2.1 General . 40
B.2.2 Accelerometers and processing amplifiers . 40
B.2.3 Recording equipment . 41
B.2.4 Fixing transducers to the floor . 41
B.3 Seat measuring devices and their applications . 42
Annex C (normative) Weighting curves . 45
C.1 General. 45
C.2 Filter functions. 46
C.2.1 General. 46
C.2.2 Band-limiting filter . 46
C.2.3 Acceleration to velocity transition . 47
C.2.4 Upward gradient . 47
C.2.5 Overall frequency weighting. 47
C.2.6 Reduction of the upper limit of the frequency range in vertical direction . 47
C.3 Tolerances . 48
C.4 Diagrams . 50
Annex D (normative) Specifying the vehicle performance regarding to ride comfort . 53
D.1 General. 53
D.2 Knowledge of intended route for comfort prediction . 53
D.3 Track specification . 53
D.4 Vehicle specification . 54
D.5 General specification . 54
Annex E (normative) Vehicle assessment with respect to ride comfort . 55
E.1 General. 55
E.2 Track geometric quality . 55
E.3 Test conditions . 56
E.3.1 Selection of test sections and test zones . 56
E.3.2 Test speed . 56
E.3.3 Wheel-rail contact geometry . 56
E.3.4 Vehicle condition . 57
E.4 Acceptable modifications of the methods for the continuous or mean comfort
evaluation . 57
E.5 Test Report . 59
Annex F (informative) Presentation of test report . 60
F.1 General. 60
F.2 Aim of test . 60
F.3 Test performer . 60
F.4 References . 60
F.5 Test conditions . 60
F.5.1 General information . 60
F.5.2 Vehicle . 61
F.5.3 Seat (for mean comfort complete method) . 61
F.5.4 Seat occupant (for mean comfort complete method) . 61
F.5.5 Track . 61
F.5.6 Speed profile . 62
F.5.7 Test configurations . 62
F.6 Measurements and processing . 62
F.6.1 Measurements . 62
F.6.2 Processing . 62
F.7 Report on mean comfort and continuous comfort . 62
F.7.1 General . 62
F.7.2 Time series . 62
F.7.3 Statistical results . 63
F.7.4 Comfort evaluation . 63
F.7.5 Spectral analyses . 63
F.8 Report on comfort in curve transitions . 68
F.9 Reporting on comfort on discrete events . 68
Annex G (informative) Guideline for the application of direct tests . 71
Annex H (informative) Workflow for calculation of RMS values from measured (or
simulated) time series of accelerations . 72
Annex I (informative) Determining quantities . 73
Annex J (informative) Guidance for the application of simulation . 76
J.1 Introduction . 76
J.2 Benefits . 76
J.3 Applications . 76
J.4 Accuracy and limitations . 77
J.5 State of the art for railway ENs . 77
Annex K (normative) Train set value for the mean comfort index . 79
K.1 Train set value definition . 79
K.2 Simple example . 79
Bibliography . 83
European foreword
This document (prEN 12299:2022) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12299:2009.
a) The Scope has been revised;
b) Normative references have been updated;
c) Clause 3, Terms and definitions has been updated;
d) Clause 4, Symbols, units and abbreviations has been revised;
e) Clause 5, General description has been revised;
f) Clause 6, Mean comfort and continuous comfort has been revised;
g) Clause 7, Comfort on curve transitions has been updated;
h) Clause 8, Comfort on discrete events has been revised;
i) Clause 9, Guide for the interpretation of the results has been updated;
j) Annex B, Measurement techniques has been updated;
k) Annex C, Weighting curves has been updated;
l) New Annex D has been added
m) (previous) Annex D has been revised and renamed in Annex F;
n) Annex E has been revised;
o) (previous) Annex F has been revised and renamed in Annex G;
p) New Annex H, I, J and K have been added to the document.
1 Scope
The purpose of this document is to provide methods for quantifying the ride comfort of a passenger in a
rail vehicle in response to the track sections it is operated over.
The methods aim to quantify the effects of vehicle body motions on ride comfort and to make the
assessment of passenger comfort predictable, repeatable, objective and meaningful.
The methods and comfort scales are validated for people of good health.
This document applies to passengers in rail vehicles operating on heavy rail networks.
This document may also be used as a guide for example on urban rail systems, but their operational
routes/environments may make it difficult to comply with the requirements of the test methods.
This document applies to measurements of motions. It also applies to simulated motions. Guidance is
provided on:
— which method described within the document should be used for different scenarios;
— typical values for different comfort levels;
— the application of simulation.
This document excludes health and safety issues, non-passenger carrying vehicles, vehicle
homologation and safety, limit values, motion sickness, discomfort caused by accelerating and braking,
design guidelines and measurement technology.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14363:2016+A2:2022, Railway applications — Testing and Simulation for the acceptance of running
characteristics of railway vehicles — Running behaviour and stationary tests
ISO 5348, Mechanical vibration and shock — Mechanical mounting of accelerometers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
passengers
people travelling in a rail vehicle, without specific activities related to the transport
3.2
ride comfort
complex sensation experienced by a passenger due to motions (vibrations, roll velocities and inertia
forces etc) transmitted through the rail vehicle body whilst running over track (see also 5.5)
3.3
interfaces
contact parts between the vehicle body or seat and the passenger with the function of sustaining and
guiding the passenger and of transmitting their weight to the vehicle body itself, e.g. floor-feet
3.4
mean comfort
perceived comfort level, continuously adjusted, as evaluated through measurement on a long-time basis
(at least some minutes)
3.5
continuous comfort
level of accelerations, frequency weighted continuously evaluated as a set of rms (root mean square)
values in vertical, lateral and longitudinal direction over a short time period (typical 5 s)
3.6
comfort on curve transition
comfort evaluation, due to a perceived curve transition, expressed as percentage of passengers feeling
uncomfortable
3.7
comfort on discrete event
comfort evaluation, due to a perceived transient acceleration, expressed as percentage of passengers
feeling uncomfortable
3.8
whole-body transmission
motion transmitted to the whole body through the interfaces between vehicle body and passenger
3.9
indirect measurement
measurement of motion environment by different motion quantities, such as acceleration or roll
velocity
3.10
direct measurement
measurement of actual passenger reactions, for example by asking passengers to fill in a questionnaire
3.11
vehicle assessment with respect to ride comfort
identifying the vehicle’s contribution to the ride comfort by relating the measured ride comfort to the
condition of the track (geometry, irregularities, turnout, bridges, etc.) and operation condition (speed,
cant deficiency, etc.)
3.12
test section
part of a rail line used for the passenger comfort test
3.13
test zone
five-minute period, which is used for mean comfort evaluation
3.14
reference system
local reference system for a vehicle body is defined through:
Origin: on the floor of the vehicle body, in the central position between the two body-bogie centre
pivots (existing or ideally defined)
Axis:
— x-axis: longitudinal
— y-axis: lateral
— z-axis: vertical
Roll motions (ϕ) are defined as rotation around the x-axis
For human body reference system, right hand system is used with vertical direction defined upwards
A more detailed definition of the reference system is given in Annex A
4 Symbols, units and abbreviations
Table 1 defines the symbols, units and abbreviations used in this document.
Table 1 — Symbols, units and abbreviation
General parameters
Parameter Symbol Unit
t
Time [s]
Time period [s]
T
τ
Integration variable [s]
V
Vehicle speed [km/h]
f
Frequency [Hz]
Interface, the floor (Plancher in French) P [-]
Interface, the seat pan (Assise in French) [-]
A
Interface, the seat back (Dossier in French) [-]
D
W
Frequency weighting curve for vertical direction [-]
b
Frequency weighting curve for longitudinal direction
W [-]
c
(backrest)
Frequency weighting curve for lateral/longitudinal
W
[-]
d
direction
W
Low-pass filter [-]
p
General parameters
Parameter Symbol Unit
n-tile k [-]
n
Percentile [%]
Number of samples N [-]
i
Imaginary unit [-]
Root mean square rms [-]
Lateral Vertical
Parameter Longitudinal axis
Axis Axis
Translational accelerations on running gear [m/s2]
..
Wheelset i – –
y
i
Translational accelerations in vehicle body [m/s2]
..*
..*
Leading end of passenger compartment –
y
z
EI
EI
..*
..*
Over leading bogie –
y
z
I
I
..*
..* ..*
Body centre
y
x z
M M
M
..* ..*
Over trailing bogie –
y y
II II
..* ..*
Trailing end of passenger compartment –
y z
EII
EII
Translational weighted accelerations [m/s2]
..* ..*
W W
–
c b
x z
Seat, weighted , D,Wc A,Wb
..*
..* ..*
W W
d b
y
Vehicle body, weighted , xP,Wd z P,Wb
P,Wd
..*
Vehicle body, weighted W
– –
p y
P,Wp
w w w
c d b
W W W
a a a
c d b
XD YA ZA
Seat, weighted , , , rms
w w w
d d b
W W
a a a
d b
XP YP ZP
Floor, weighted , , rms
w w w
d d b
Floor, Weighted W , W , rms, 50th percentile
a a a
d b
XP50 YP50 ZP50
w w w
c d b
W W W
a a a
c d b
XD95 YA95 ZA95
Seat, weighted , , , rms, 95th percentile
w w w
d d b
Floor, weighted W , W , rms, 95th percentile a a a
d b XP95 YP95 ZP95
General parameters
Parameter Symbol Unit
..
One-second average – –
yt()
ls
..
Two-second average – –
yt()
2s
..
Peak to peak – –
yt()
pp
..
y
One-second average, maximum absolute value – –
ls
max
..
Two-second average, absolute value – yt() –
2s
Translational jerk in vehicle body [m/s ]
yt
One-second average – () –
1s
y
One-second average, maximum absolute value – –
1s
max
Angular velocity in vehicle body [rad/s]
*
φ t
Body () – –
*
W
φ t
p () – –
Wp
Weighted
φ t
One-second average () – –
1s
φ
One-second average, maximum absolute value – –
1s
max
Lateral Vertical
Parameter Longitudinal axis
Axis Axis
Comfort indexes [-]
Mean comfort standard method
N
MV
Mean comfort standard method, partial index
N N N
MVx MVy MVz
Mean comfort complete method, seated passenger
N
VA
(in French: VA = voyageur assis)
Mean comfort complete method, standing passenger
N
VD
(in French: VD = voyageur debout)
Continuous comfort
C C C
Cx Cy Cz
Comfort on curve transitions –
P P
CT CT
, _3sec
–
P P
CT_Rol CT_Lat
General parameters
Parameter Symbol Unit
Comfort on discrete events – –
P
DE
Constants for passenger comfort on curve transitions and discrete events
Parameter Symbol Unit
Constant in acceleration component in curve transitions [s /m]
A
Constant in acceleration component in curve transitions [s /m]
B
Constant in acceleration component in curve transitions C [-]
Constant in roll velocity component in curve transitions D [s/rad]
Constant in roll velocity component in curve transitions E [-]
a
Constant in acceleration component in discrete events [s /m]
Constant in acceleration component in discrete events b [s /m]
c
Constant in acceleration component in discrete events
[-]
Transfer functions
Parameter Symbol Unit
f
Corner frequencies, n = 1,2,3,4,5,6 [Hz]
n
Q
Resonant quality factors, n = 1,2,3,4 [-]
n
Gain [-]
K
Hf
High pass transfer function ( ) [-]
h
Low pass transfer function Hf( ) [-]
l
Hf
Acceleration to velocity transfer function ( ) [-]
t
Upward gradient transfer function Hf( ) [-]
s
f
Corner frequencies, n = 1,2,3,4,5,6 [Hz]
n
Q
Resonant quality factors, n = 1,2,3,4 [-]
n
5 General description
5.1 General
The comfort of passengers in a rail vehicle is influenced by a number of different factors (temperature,
noise, vibration, etc.). This document considers only that part of the comfort influenced by the
vibrations and motions of the vehicle. This is described as ride comfort or as passenger comfort. The
document can also be used for vehicle assessment with respect to ride comfort.
This document defines as the standard method:
a) The standard method for mean comfort evaluation, taking into account the effects of vibration
exposure measured on the floor of the vehicle body.
This document also defines several methods for special applications:
b) taking into account the short time effects of vibration exposure measured on the floor of the vehicle
body as continuous comfort for the longitudinal, lateral, and vertical direction
c) taking into account the vibration exposure measured on the seat or other interfaces on ride comfort
as the complete method for mean comfort evaluation
d) taking into account the effects of:
1) discrete events (comfort on discrete events) and
2) running on curve transitions (comfort on curve transitions) on ride comfort.
e) taking into account the vibration exposure measured on the floor of the vehicle body for the
purpose of vehicle assessment with respect to ride comfort.
5.2 Passenger exposure to vibrations
Rail transport exposes passengers to vibrations related to the dynamic motions of the vehicle body.
The motions of the vehicle body transmit their effects to the human body through the following
interfaces:
a) in the standing position:
1) floor – feet
b) in the seated position:
1) headrest – head
2) arm rest – arms
3) seat – hips
4) backrest – back
5) floor – feet
The type of transmission is whole-body transmission which acts on the whole body through the
interfaces.
5.3 Application
Table 2 lists the items included or excluded from this standard:
Table 2 — Items considered by this standard
Item Included Excluded
Effects of — on ride comfort — on health
vibration
— on vehicle assessment with respect — on activities
exposure
to ride of comfort — on motion sickness
Vibration transfer — on whole body through — on single body part
interfaces
— on whole surface
— through floor interface
Test procedure — definitions — notes or attributes related to
service quality and/or passenger
— reference system
expectation
— requirements
— limit values
— measurement and evaluation rules
— guidance on reporting
Posture and — standing — lying down
activities of
— seated — performing specific actions
passenger (reading, writing etc.)
Type of — indirect measurement, i.e. — direct measurements (by
measurement measurement of motion environment by asking test subjects)
different motion quantities
— combined measurements
5.4 Characteristics of rail vehicle motions
The basic typical motion characteristics, referred to the type of measurement and evaluation, are:
a) Different properties, depending on the type of evaluation:
1) quasi-stationary (Mean comfort)
2) non-stationary (Comfort on curve transitions and comfort on discrete events).
b) The frequency range of motions expected in rail vehicles includes, in the lateral direction:
1) up to 15 Hz: due to track characteristics, vehicle body swing-roll and yaw modes at lower
frequencies, and suspensions characteristics and vehicle body modes at higher frequencies
c) The frequency range of motions expected in rail vehicles includes, in the vertical direction:
1) up to 40 Hz: due to track characteristics, suspensions characteristics, wheel defects, vehicle
body modes
d) Range of frequencies from 0 Hz (quasi-static) to 2 Hz for comfort on curve transitions and for
discrete e vents.
5.5 Ride comfort
The ride comfort for passengers is the complex sensation, produced on the passenger by the vehicle
body motions of the railway vehicle, transmitted to the whole body through the interfaces.
This sensation is classified as:
a) average sensation, based on the vibration applied on a long-time basis (several minutes)
b) quasi-static lateral acceleration due to curving
c) instantaneous sensation: a sudden change of the average sensation, due to a short-basis event
(change of mean lateral acceleration level with possible oscillation, roll motion at significant
velocity and lateral jerk).
The first type of sensation is taken into account in the mean comfort evaluation.
The second and the third type of sensation are taken into account in the comfort on curve transitions
and in comfort on discrete events.
NOTE For situations with curve radii considerably sharper and transitions considerably sh
...
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