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ISO 19380:2019

(Main)

Heavy commercial vehicles and buses — Centre of gravity measurements — Axle lift, tilt-table and stable pendulum test methods

Heavy commercial vehicles and buses — Centre of gravity measurements — Axle lift, tilt-table and stable pendulum test methods

This document describes a standard method for measuring a vehicle's longitudinal and lateral (horizontal plane) centre of gravity (CG) positions and three methods for estimating a vehicle's vertical CG position, the axle lift, tilt-table, and stable pendulum methods. It applies to heavy vehicles, that is commercial vehicles and buses as defined in ISO 3833 (trucks and trailers with maximum weight above 3,5 tonnes and buses and articulated buses with maximum weight above 5 tonnes, according to ECE and EC vehicle classification, categories M3, N2, N3, O3 and O4). CG measurements are performed separately for each single unit.

Véhicules utilitaires lourds et autobus — Mesure du centre de gravité — Méthode d'essais du plateau incline, levage d'un essieu et pendule stable

General Information

Status
Published
Publication Date
13-Aug-2019
ICS
43.080.01 - Commercial vehicles in general
Technical Committee
ISO/TC 22/SC 33 - Vehicle dynamics and chassis components
Drafting Committee
ISO/TC 22/SC 33/WG 6 - Vehicle dynamics of heavy commercial vehicles and buses
Current Stage
9020 - International Standard under periodical review
Start Date
15-Jul-2024
Completion Date
15-Jul-2024
Ref Project

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ISO 19380:2019 - Heavy commercial vehicles and buses -- Centre of gravity measurements -- Axle lift, tilt-table and stable pendulum test methodsISO 19380:2019 - Heavy commercial vehicles and buses -- Centre of gravity measurements -- Axle lift, tilt-table and stable pendulum test methods
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ISO 19380:2019 - Heavy commercial vehicles and buses -- Centre of gravity measurements -- Axle lift, tilt-table and stable pendulum test methods
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INTERNATIONAL ISO
STANDARD 19380
First edition
2019-08
Heavy commercial vehicles
and buses — Centre of gravity
measurements — Axle lift, tilt-table
and stable pendulum test methods
Véhicules utilitaires lourds et autobus — Mesure du centre de gravité —
Méthode d'essais du plateau incline, levage d'un essieu et pendule stable
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principles . 3
5 Variables . 3
5.1 Reference system . 3
5.2 Variables to be measured . 3
5.2.1 Variables to be measured for location of x and y coordinates of centre
CG CG
of gravity in horizontal plane . 3
5.2.2 Variables to be measured using the axle lift method for location of z
CG
coordinates . 4
5.2.3 Variables to be measured using the tilt-table method for location of z
CG
coordinates . 4
5.2.4 Variables to be measured using the stable pendulum method for location
of z coordinates . . 4
CG
6 Measuring equipment . 5
7 Test conditions . 6
7.1 General . 6
7.2 Ambient conditions . 6
7.3 Test surface . 6
7.4 Test vehicle . 6
7.5 Operating and other liquids . 6
7.6 Loading conditions, suspension and mechanical parts . 6
8 Determination of the centre of gravity in the horizontal plane . 7
8.1 General . 7
8.2 x position of the centre of gravity in the horizontal plane . 7
CG
8.2.1 Two axle vehicles . 7
8.2.2 More than two axles . 7
8.3 y position of the centre of gravity in the horizontal plane . 8
CG
8.3.1 Two axle vehicles . 8
8.3.2 More than two axles . 8
9 Determination of the centre of gravity height . 8
9.1 General . 8
9.2 Axle lift method . 8
9.2.1 General guidance . 8
9.2.2 Procedure .10
9.2.3 Determination of the axle load and inclination angle .11
9.2.4 Location of the centre of gravity above the ground plane with loaded tyre
radius .11
9.3 Tilt-table method .12
9.3.1 General guidance .12
9.3.2 Tilt-table procedures.14
9.3.3 Determination of the centre of gravity height z .15
CG
9.3.4 Data presentation .15
9.4 Stable pendulum method .15
9.4.1 General guidance .15
9.4.2 Stable pendulum procedure .17
9.4.3 Determination of platform properties .17
9.4.4 Determination of the applied torque .17
9.4.5 Consideration of platform deflection .18
9.4.6 Determination of the centre of gravity height, z .18
CG
9.4.7 Data Presentation.18
Annex A (informative) Determination of static loaded radius, r .19
stat
Annex B (informative) Test report — Axle lift method .20
Annex C (informative) Test report — Tilt method (up to 3 axles) .23
Annex D (informative) Test report — Stable pendulum method .26
Bibliography .29
iv © ISO 2019 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33,
Vehicle dynamics and chassis components.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
Introduction
Methods are presented for measuring the location of the centre of gravity of an individual vehicle unit
in the horizontal, lateral and vertical planes. Location of the longitudinal and lateral centre of gravity
positions are obtained through successive use of wheel or platform scales. Three different methods
are described for measurement of the vertical centre of gravity – the axle lift method, the tilt-table
method, and the stable pendulum method. The selection of the method to use depends on the facility
and resource availability, as well as constraints imposed by the vehicle design. Knowledge of a vehicle
unit’s centre of gravity supports vehicle modelling work, design validation and planning for other
dynamic tests yet to be performed.
vi © ISO 2019 – All rights
...

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