Regulation No. 33-00

Name:Regulation No. 33-00
Description:Collision Structure Performance - Front End.
Official Title:Uniform Provisions Concerning the Approval of: Vehicles with Regard to the Behaviour of the Structure of the Impacted Vehicle in a Head-on Collision.
Country:ECE - United Nations
Date of Issue:1975-07-01
Amendment Level:00 Series, Supplement 2
Number of Pages:26
Vehicle Types:Car
Subject Categories:Occupant Protection
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Keywords:

vehicle, approval, regulation, seat, point, machine, angle, paragraph, torso, position, annex, type, manufacturer, test, means, seating, reference, impact, plane, structure, front, back, vertical, actual, design, pan, requirements, granted, passenger, forward, foot, collision, horizontal, compartment, procedure, data, leg, tests, vehicles, defined, positions, number, head-on, passing, behaviour, line, mark, barrier, prescribed, centre

Text Extract:

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E/ECE/324 )
E/ECE/TRANS/505 ) Rev.1/Add.32/Rev.1/Amend.2
August 6, 2007
STATUS OF UNITED NATIONS REGULATION
ECE 33
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
VEHICLES WITH REGARD TO THE BEHAVIOUR OF THE STRUCTURE
OF THE IMPACTED VEHICLE IN A HEAD-ON COLLISION
Incorporating:
00 series of amendments
Date of Entry into Force: 01.07.75
Corr. 1 to the 00 series of amendments
Dated: 11.09.92
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 17.11.99
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 11.06.07

REGULATION NO. 33
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF VEHICLES WITH REGARD TO THE
BEHAVIOUR OF THE STRUCTURE OF THE IMPACTED VEHICLE IN A HEAD-ON COLLISION
REGULATION
CONTENTS
1.
Scope
2.
Definitions
3.
Application for approval
4.
Approval
5.
Requirements
6.
Test
7.
Modifications and extension of approval of the vehicle type
8.
Conformity of production
9.
Penalties for non-conformity of production
10.
Names and addresses of technical services conducting approval tests, and of administrative
departments
ANNEXES
Annex 1 -
Annex 2 -
Annex 3 -
Annex 4 -
Communication concerning the approval or extension or refusal or withdrawal of approval or
production definitely discontinued of a vehicle type with regard to the behaviour of the
structure of the passenger compartment in a head-on collision, pursuant to Regulation
No. 33
Arrangements of the approval mark
Procedure for determining the "H" point and the actual torso angle for seating positions in
motor vehicles
Frontal impact test against a barrier

2.2.5. "unladen kerb weight" means the weight of the vehicle in running order, unoccupied and
unladen but complete with fuel, coolant, lubricant, tools and a spare wheel (if provided as
standard equipment by the vehicle manufacturer);
2.2.6. "capacity of the fuel tank" means the fuel-tank capacity as specified by the manufacturer.
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a vehicle type with regard to the behaviour of the structure of
the passenger compartment in a head-on collision shall be submitted by the vehicle
manufacturer or by his duly accredited representative.
3.2. It shall be accompanied by the undermentioned documents in triplicate and by the following
particulars:
3.2.1. a detailed description of the vehicle type with respect to its structure, dimensions, lines and
constituent materials;
3.2.2. drawings of the vehicle showing the vehicle type in front, side and rear elevation and design
details of the forward part of the structure, and
3.2.3. particulars of the vehicle's unladen kerb weight.
3.2.4. Evidence that the vehicle complies with the specifications of Regulation No. 94, 01 series of
amendments.
3.3. A vehicle representative of the type to be approved shall be submitted to the technical
service responsible for conducting the approval tests.
3.3.1. A vehicle not comprising all the components proper to the type may be accepted for test
provided that it can be shown that the absence of the components omitted has no
detrimental effect on the results of the test, so far as the requirements of this Regulation are
concerned.
3.3.2. It shall be the responsibility of the applicant for approval to show that acceptance of the
variants referred to in Paragraph 3.3.1. is compatible with compliance with the requirements
of this Regulation.
4. APPROVAL
4.1. If the vehicle submitted for approval pursuant to this Regulation meets the requirements of
Paragraphs 5. and 6., below, approval of that vehicle type shall be granted.
4.2. An approval number shall be assigned to each type approved. Its first two digits
(at present 00 for the Regulation in its original form) shall indicate the series of amendments
incorporating the most recent major technical amendments made to the Regulation at the
time of issue of the approval. The same Contracting Party may not assign the same
number to another vehicle type within the meaning of Paragraph 2.2.2. above.
4.3. Notice of approval or of extension or of refusal or withdrawal of approval or production
definitely discontinued of a vehicle type pursuant to this Regulation shall be communicated
to the Parties to the Agreement which apply this Regulation by means of a form conforming
to the model in Annex 1 to this Regulation.

5.3. Before impact, the straight line formed for each front seat by the intersection of the
longitudinal plane passing through the centre of the seat with the horizontal plane passing
through the centre of the service brake pedal in the position of rest shall be
determined. The distance between the point of intersection of the said straight line with the
front of the passenger compartment and its point of intersection with the transverse plane
passing through the corresponding "R" point shall then be determined. After impact, this
distance shall be not less than 650 mm.
5.4. The width of the footwell shall be determined as follows:
5.4.1. before impact, the points shall be determined at which a transverse horizontal axis passing
through the centre of the service brake pedal in the position of rest meets the side walls of
the footwell;
5.4.2. after impact, the distance separating two longitudinal vertical planes passing through the
same points shall be measured. This distance shall be not less than 250 mm for each front
seat.
5.5. The distance from floor to roof shall be determined along a vertical passing through the "R"
point and situated in the longitudinal plane passing through the centre of each front seat.
After impact, this distance shall not be reduced by more than 10%.
5.6. For measuring the distances referred to in Paragraphs 5.2., 5.3., 5.4. and 5.5., compression
corresponding to a force of 10 daN applied over a surface of 5 x 5 cm may be exerted in the
direction of measurement.
5.7. After the test, no rigid component in the passenger compartment shall constitute a risk of
serious injury to the vehicle's occupants.
5.8. In addition, the side doors of the vehicle shall not open under the effect of the impact.
5.9. Except in the case of a vehicle not having a roof of rigid construction, the opening of a
number of doors sufficient to enable all the occupants to get out must be possible after the
impact without the use of tools.
5.10. Specifications of Paragraphs 5.1. to 5.9. above are deemed to be met if the vehicle
concerned complies with the requirements of Regulation No. 94, 01 series of amendments.
6. TESTS
The vehicle's compliance with the requirements of Paragraph 5. above shall be checked by
the methods set out in Annexes 3 and 4 to this Regulation.
7. MODIFICATIONS AND EXTENSION OF APPROVAL OF THE VEHICLE TYPE
7.1. Every modification of the vehicle type shall be notified to the administrative department
which approved the vehicle type. The department may then either:
7.1.1. consider that the modifications made are unlikely to have appreciable adverse effects, and
that in any case the vehicle still meets the requirements; or
7.1.2. require a further test report from the technical service responsible for conducting the tests.

11. NAMES AND ADDRESSES OF TECHNICAL SERVICES CONDUCTING APPROVAL
TESTS, AND OF ADMINISTRATIVE DEPARTMENTS
The Parties to the Agreement which apply this Regulation shall communicate to the
Secretariat of the United Nations the names and addresses of the technical services
conducting approval tests and of the administrative departments which grant approval and
to which forms certifying approval or refusal or withdrawal of approval, issued in other
countries, are to be sent.

9. Date of test report issued by that service ..................................................................................
10. Number of test report issued by that service .............................................................................
11. Approval granted/extended/refused/withdrawn ......................................................................
12. Position of approval mark on the vehicle ...................................................................................
13. Place ..........................................................................................................................................
14. Date............................................................................................................................................
15. Signature....................................................................................................................................
The list of documents deposited with the Administrative Service which has granted approval
is annexed to this communication and may be obtained on request.

ANNEX 3
PROCEDURE FOR DETERMINING THE "H" POINT AND THE ACTUAL TORSO ANGLE FOR
SEATING POSITIONS IN MOTOR VEHICLES
1. PURPOSE
The procedure described in this annex is used to establish the "H" point location and the
actual torso angle for one or several seating positions in a motor vehicle and to verify the
relationship of measured data to design specifications given by the vehicle manufacturer.
2. DEFINITIONS
For the purposes of this Annex:
2.1. "Reference data" means one or several of the following characteristics of a seating
position:
2.1.1. the "H" point and the "R" point and their relationship,
2.1.2. the actual torso angle and the design torso angle and their relationship.
2.2. "Three-dimensional `H' point machine" (3-D H machine) means the device used for the
determination of "H" points and actual torso angles. This device is described in Appendix 1
to this Annex;
2.3. "`H' point" means the pivot centre of the torso and the thigh of the 3-D H machine installed
in the vehicle seat in accordance with Paragraph 4 below. The "H" point is located in the
centre of the centreline of the device which is between the "H" point sight buttons on either
side of the 3-D H machine. The "H" point corresponds theoretically to the "R" point (for
tolerances see Paragraph 3.2.2. below). Once determined in accordance with the
procedure described in Paragraph 4, the "H" point is considered fixed in relation to the
seat-cushion structure and to move with it when the seat is adjusted;
2.4. "`R' point" or "seating reference point" means a design point defined by the vehicle
manufacturer for each seating position and established with respect to the
three-dimensional reference system;
2.5. "Torso-line" means the centreline of the probe of the 3-D H machine with the probe in the
fully rearward position;
2.6. "Actual torso angle" means the angle measured between a vertical line through the "H"
point the torso line using the back angle quadrant on the 3-D H machine. The actual torso
angle corresponds theoretically to the design torso angle (for tolerances see
Paragraph 3.2.2. below):

3.2.4. If the "H" point or the actual torso angle does not satisfy the requirements of
Paragraph 3.2.2. above, the "H" point and the actual torso angle shall be determined twice
more (three times in all). If the results of two of these three operations satisfy the
requirements, the conditions of Paragraph 3.2.3. above shall apply.
3.2.5. If the results of at least two of the three operations described in Paragraph 3.2.4. above do
not satisfy the requirements of Paragraph 3.2.2. above, or if the verification cannot take
place because the vehicle manufacturer has failed to supply information regarding the
position of the "R" point or regarding the design torso angle, the centroid of the three
measured points or the average of the three measured angles shall be used and be
regarded as applicable in all cases where the "R" point or the design torso angle is referred
to in this Regulation.
4. PROCEDURE FOR "H" POINT AND ACTUAL TORSO ANGLE DETERMINATION
4.1. The vehicle shall be preconditioned at the manufacturer's discretion, at a temperature of
20 ± 10°C to ensure that the seat material reached room temperature. If the seat to be
checked has never been sat upon, a 70 to 80 kg person or device shall sit on the seat twice
for one minute to flex the cushion and back. At the manufacturer's request, all seat
assemblies shall remain unloaded for a minimum period of 30 min prior to installation of the
3-D H machine.
4.2. The vehicle shall be at the measuring attitude defined in Paragraph 2.11. above.
4.3. The seat, if it is adjustable, shall be adjusted first to the rearmost normal driving or riding
position, as indicated by the vehicle manufacturer, taking into consideration only the
longitudinal adjustment of the seat, excluding seat travel used for purposes other than
normal driving or riding positions. Where other modes of seat adjustment exist (vertical,
angular, seat-back, etc.) these will then be adjusted to the position specified by the vehicle
manufacturer. For suspension seats, the vertical position shall be rigidly fixed
corresponding to a normal driving position as specified by the manufacturer.
4.4. The area of the seating position contacted by the 3-D H machine shall be covered by a
muslin cotton, of sufficient size and appropriate texture, described as a plain cotton fabric
having 18.9 threads per cm and weighing 0.228 kg/m or knitted or non-woven fabric
having equivalent characteristics. If test is run on a seat outside the vehicle, the floor on
which the seat is placed shall have the same essential characteristics as the floor of the
vehicle in which the seat is intended to be used.
4.5. Place the seat and back assembly of the 3-D H machine so that the centreplane of the
occupant (C/LO) coincides with the centreplane of the 3-D H machine. At the
manufacturer's request, the 3-D H machine may be moved inboard with respect to the C/LO
if the 3-D H machine is located so far outboard that the seat edge will not permit levelling of
the 3-D H machine.
4.6. Attach the foot and lower leg assemblies to the seat pan assembly, either individually or by
using the T-bar and lower leg assembly. A line through the "H" point sight buttons shall be
parallel to the ground and perpendicular to the longitudinal centreplane of the seat.

4.11. Install the right and left buttock weights and then, alternately, the eight torso weights.
Maintain the 3-D H machine level.
4.12. Tilt the back pan forward to release the tension on the seat-back. Rock the 3-D H machine
from side to side through 10° arc (5° to each side of the vertical centreplane) for three
complete cycles to release any accumulated friction between the 3-D H machine and the
seat.
During the rocking action, the T-bar of the 3-D H machine may tend to diverge from the
specified horizontal and vertical alignment. The T-bar must therefore be restrained by
applying an appropriate lateral load during the rocking motions. Care shall be exercised in
holding the T-bar and rocking the 3-D H machine to ensure that no inadvertent exterior
loads are applied in a vertical or fore and aft direction.
The feet of the 3-D H machine are not to be restrained or held during this step. If the feet
change position, they should be allowed to remain in that attitude for the moment.
Carefully return the back pan to the seat-back and check the two spirit levels for zero
position. If any movement of the feet has occurred during the rocking operation of the 3-D H
machine, they must be repositioned as follows:
Alternately, lift each foot off the floor the minimum necessary amount until no additional foot
movement is obtained. During this lifting, the feet are to be free to rotate; and no forward or
lateral loads are to be applied. When each foot is placed back in the down position, the heel
is to be in contact with the structure designed for this.
Check the lateral spirit level for zero position; if necessary, apply a lateral load to the top of
the back pan sufficient to level the 3-D H machine's seat pan on the seat.
4.13. Holding the T-bar to prevent the 3-D H machine from sliding forward on the seat cushion,
proceed as follows:
(a)
(b)
return the back pan to the seat-back;
alternately apply and release a horizontal rearward load, not to exceed 25 N, to the
back angle bar at a height approximately at the centre of the torso weights until the
hip angle quadrant indicates that a stable position has been reached after load
release. Care shall be exercised to ensure that no exterior downward or lateral loads
are applied to the 3-D H machine. If another level adjustment of the 3-D H machine is
necessary, rotate the back pan forward, re-level, and repeat the procedure from
Paragraph 4.12.
4.14. Take all measurements:
4.14.1. The coordinates of the "H" point are measured with respect to the three-dimensional
reference system.
4.14.2. The actual torso angle is read at the back angle quadrant of the 3-D H machine with the
probe in its fully rearward position.

ANNEX 3 - APPENDIX 1
DESCRIPTION OF THE THREE-DIMENSIONAL "H" POINT MACHINE
(3-D H machine)
1. BACK AND SEAT PANS
The back and seat pans are constructed of reinforced plastic and metal; they simulate the
human torso and thigh and are mechanically hinged at the "H" point. A quadrant is fastened
to the probe hinged at the "H" point to measure the actual torso angle. An adjustable thigh
bar, attached to the seat pan, establishes the thigh centreline and serves as a baseline for
the hip angle quadrant.
2. BODY AND LEG ELEMENTS
Lower leg segments are connected to the seat pan assembly at the T-bar joining the knees,
which is a lateral extension of the adjustable thigh bar. Quadrants are incorporated in the
lower leg segments to measure knee angles. Shoe and foot assemblies are calibrated to
measure the foot angle. Two spirit levels orient the device in space. Body element weights
are placed at the corresponding centres of gravity to provide seat penetration equivalent to
a 76 kg male. All joints of the 3-D H machine should be checked for free movement without
encountering noticeable friction.

Figure 2
Dimensions of the 3-D H Machine Elements and Load Distribution

ANNEX 3 – APPENDIX 3
REFERENCE DATA CONCERNING SEATING POSITIONS
1. CODING OF REFERENCE DATA
Reference data are listed consecutively for each seating position. Seating positions are
identified by a two-digit code. The first digit is an Arabic numeral and designates the row of
seats, counting from the front to the rear of the vehicle. The second digit is a capital letter
which designates the location of the seating position in a row, as viewed in the direction of
forward motion of the vehicle; the following letters shall be used:
L = left
C = centre
R = right
2. DESCRIPTION OF VEHICLE MEASURING ATTITUDE
2.1. Co-ordinates of Fiducial Marks
X................................................
Y................................................
Z ................................................
3. List of Reference Data
3.1. Seating position:......................................................................................
3.1.1. Co-ordinates of "R" point
X................................................
Y................................................
Z ................................................
3.1.2. Design torso angle: .................................................................................
3.1.3. Specifications for seat adjustment
horizontal:..................................
vertical:......................................
angular: .....................................
torso angle: ...............................
Note: List reference data for further seating positions under 3.2, 3.3, etc.

1.5. Velocity on Impact
The velocity on impact must be between 48.3 km/h and 53.1 km/h. However, if the test has
been carried out at a higher impact velocity and the vehicle has satisfied the conditions
prescribed, the test is considered satisfactory.
1.6. Measuring Instruments
2. RESULTS
The instrument used to record the speed referred to in Paragraph 1.5. above shall be
accurate to within 1%.
Before and after impact, the dimensions specified in Paragraph 5. of this Regulation shall be
measured and recorded.
3. CORRECTION FACTORS
3.1. Notation
V
m
m
D
D
Recorded speed in km/h;
Weight mass of prototype in state defined in Paragraph 1.4. of this Annex;
Weight mass of prototype with testing apparatus;
Residual dimensions measured after the impact, as defined in Paragraph 5. of this
Regulation;
Corrected residual dimensions used to determine results of test;
K =
the greater of
(48.3)
v
and 0.83;
K = the greater of m
m and 0.8.
3.2. The corrected dimensions D used to check the conformity of the prototype with the
requirements of this Regulation shall be calculated by the following formula:
D = D . K . K

Collision Structure Performance - Front End.