Regulation No. 138-00 Proposal

Name:Regulation No. 138-00 Proposal
Description:Regulation on the Approval of Quiet Road Transport Vehicles (QRTV) - Proposal.
Official Title:Uniform Provisions Concerning the Approval of Quiet Road Transport Vehicles with Regard to their Reduced Audibility - Proposal.
Country:ECE - United Nations
Date of Issue:2015-12-22
Amendment Level:Original
Number of Pages:42
Information:Published as Regulation No. 138-00
Vehicle Types:Bus, Car, Component, Heavy Truck, Light Truck
Subject Categories:Drafts and Proposals (Historical)
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Keywords:

vehicle, test, sound, speed, approval, paragraph, level, frequency, annex, regulation, type, measurement, background, noise, pressure, avas, condition, manufacturer, constant, facility, reported, requirements, a-weighted, line, vehicles, means, figure, measurements, conditions, microphone, indoor, range, maximum, tests, minimum, shift, tested, target, outdoor, method, plane, simulated, signal, motor, system, electric, table, granted, motion, sample

Text Extract:

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ECE/TRANS/WP.29/2016/26
DRAFT REGULATION CONCERNING THE APPROVAL
OF QUIET ROAD TRANSPORT VEHICLES (QRTV)
(ECE 138-00)
ADOPTED AT THE 168 SESSION – MARCH 2016
PROVISIONAL DATE OF ENTRY INTO FORCE: OCTOBER 5, 2016

DRAFT REGULATION ON THE APPROVAL OF
QUIET ROAD TRANSPORT VEHICLES (QRTV)
(ECE 138-00)
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF QUIET ROAD
TRANSPORT VEHICLES WITH REGARD TO THEIR REDUCED AUDIBILITY
1. SCOPE
This Regulation applies to electrified vehicles of Categories M and N which can travel in the
normal mode, in reverse or at least one forward drive gear, without an internal combustion
engine operating in respect to their audibility.
2. DEFINITIONS
For the purpose of this Regulation,
2.1. "Approval of a vehicle" means the approval of a vehicle type with regard to sound;
2.2. "Acoustic Vehicle Alerting System" (AVAS) means a component or set of components
installed in vehicles with the primary purpose to fulfil the requirements of this Regulation;
2.3. "Vehicle type" means a category of motor vehicles which does not differ essentially in such
respects as:
2.3.1. The shape and the materials of the bodywork of the vehicle which affect the sound level
emitted.
2.3.2. The principle of the drivetrain (from the batteries to the wheels). Notwithstanding the
provisions of 2.3.2. vehicles which differ with respect to overall gear ratios, battery type or
the fitment of a range extender may be considered vehicles of the same type;
2.3.3. If applicable, the number and type(s) of sound emitting devices (hardware) of AVAS fitted on
the vehicle;
2.3.4. If applicable, the position of the AVAS on the vehicle.
2.4. "Frequency Shift" means the variation of the frequency content of the AVAS sound as a
function of the vehicle speed.
2.5. "Electrified vehicle" means a vehicle with a powertrain containing at least one electric
motor or electric motor-generator.
2.5.1. "Pure Electric Vehicle" (PEV) means a motor vehicle with an electric motor as its sole
mean of propulsion.

Table 1
Symbols and Abbreviations
Symbol Unit Paragraph Explanation
ICE – 6.2. Internal Combustion Engine
AA' – Annex 3 Paragraph 3
BB' – Annex 3 Paragraph 3
Line perpendicular to vehicle travel which indicates
the beginning of the zone to record sound pressure
level during test
Line perpendicular to vehicle travel which indicates
end of the zone to record sound pressure level
during test
PP' – Annex 3 Paragraph 3
Line perpendicular to vehicle travel which indicates
location of microphones
CC' – Annex 3 Paragraph 3 Centreline of vehicle travel
v km/h Annex 3 Paragraph 3 Target vehicle test velocity
j – Annex 3 Paragraph 3
L dB(A) Annex 3 Paragraph 3
L dB(A) Annex 3 Paragraph 3
L dB(A) Annex 3 Paragraph 3
Index for single test run within standstill or constant
speed test conditions
Vehicle A-weighted sound pressure level for
reversing test
Vehicle A-weighted sound pressure level for
constant speed test at 10km/h.
Vehicle A-weighted sound pressure level for
constant speed test at 20km/h.
L dB(A) Annex 3 Paragraph 2.3.2 Background noise correction
L dB(A) Annex 3 Paragraph 2.3.2.
L dB(A) Annex 3 Paragraph 2.3.2.
A-weighted sound pressure level result of j test
run
A-weighted sound pressure level result of j test
run corrected for background noise
L dB(A) Annex 3 Paragraph 2.3.1. Background A-weighted sound pressure level.
∆L dB(A) Annex 3 Paragraph 2.3.2.
∆L dB(A) Annex 3 Paragraph 2.3.2.
v km/h Annex 3 Paragraph 4
f Hz Annex 3 Paragraph 4
f Hz Annex 3 Paragraph 4
f Hz Annex 3 Paragraph 4
l m Annex 3 Appendix Length of vehicle
Range of maximum to minimum value of the
representative background noise A-weighted sound
pressure level over a defined time period.
A-weighted sound pressure level of j test result
minus the A-weighted background noise level
(∆L = L - L )
Reference vehicle velocity used for calculating
frequency shift percentage.
Single frequency component at a given vehicle
speed per sample segment, e.g. f
Single frequency component at reference vehicle
speed
Single frequency component at a given vehicle
speed, e.g. f

5.4. There shall be affixed to every vehicle conforming to a vehicle type approved under this
Regulation, conspicuously and in a readily accessible place specified on the approval form,
an international approval mark consisting of:
5.4.1. A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval;
5.4.2. The number of this Regulation, followed by the Letter "R", a dash and the approval number
to the right of the circle prescribed in Paragraph 5.4.1.
5.5. If the vehicle conforms to a vehicle type approved, under one or more other Regulations
annexed to the Agreement, in the country which has granted approval under this
Regulation, the symbol prescribed in Paragraph 5.4.1. need not be repeated. In such a case
the regulation and approval numbers and the additional symbols of all the Regulations
under which approval has been granted in the country which has granted approval under
this Regulation shall be placed in vertical columns to the right of the symbol prescribed in
Paragraph 5.4.1.
5.6. The approval mark shall be clearly legible and indelible.
5.7. The approval mark shall be placed close to or on the vehicle data plate affixed by the
manufacturer.
5.8. Annex 2 to this Regulation gives examples of arrangements of the approval mark.
6. SPECIFICATIONS
6.1. General Specifications
For the purpose of this Regulation, the vehicle shall fulfil the following requirements:
6.2. Acoustics Characteristics
The sound emitted by the vehicle type submitted for approval shall be measured by the
methods described in Annex 3 to this Regulation. The speed range for operation is the
range of greater than 0km/h up to and inclusive 20km/h.
If the vehicle that is not equipped with an AVAS fulfils the overall levels as specified in
Table 2 below with a margin of +3dB(A), the specification for one-third octave bands and the
frequency shift do not apply.

6.2.6. Pause Function
The manufacturer may install a function for temporary deactivation of the AVAS. Any other
deactivation function, which does not satisfy the specification below, is prohibited.
6.2.6.1. The function shall be located so that it is operable by the driver in a normal seating position.
6.2.6.2. In the case when the pause function is activated, the suspension of AVAS has to be clearly
indicated to the driver.
6.2.6.3. The AVAS shall be reactivated when the vehicle is started upon each vehicle turn-off.
6.2.6.4. Owner’s Manual Information
If a pause function is installed, the manufacturer shall provide the owner with information
(e.g. in the owner’s manual) on its effect:
"The pause function of the Acoustic Vehicle Alerting System (AVAS) shall not be used
unless for an obvious lack of necessity to emit sound for alert in the surrounding area and
that it is certain that there are no pedestrians within the short distance."
6.2.7. Specifications on Maximum Sound Level for AVAS
When tested under the conditions of Annex 3 Paragraph 3.3.2, a vehicle which is equipped
with an AVAS, shall not emit an overall sound level of more than 75dB(A), if driving in
forward direction.

7. MODIFICATION AND EXTENSION OF APPROVAL OF A VEHICLE TYPE
7.1. Every modification of the vehicle type shall be notified to the Type Approval Authority which
approved the vehicle type. The Type Approval Authority may then either:
7.1.1. Consider that the modifications made are unlikely to have an appreciable adverse effect and
that in any case the vehicle still complies with the requirements, or
7.1.2. Require a further test report from the Technical Service responsible for conducting the tests.
7.2. Confirmation or refusal of approval, specifying the alterations shall be communicated by the
procedure specified in Paragraph 5.3. above to the Parties to the Agreement applying this
Regulation.
7.3. The Type Approval Authority issuing the extension of approval shall assign a series number
for such an extension and inform thereof the other Parties to the 1958 Agreement applying
this Regulation by means of a communication form conforming to the model in Annex 1 to
this Regulation.
8. CONFORMITY OF PRODUCTION
The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2) with the following requirements:
8.1. Vehicles approved according to this Regulation shall be manufactured so as to conform to
the type approved and satisfy the requirements set forth in Paragraph 6.2. above.
8.2. The authority which has granted type approval may at any time verify the conformity control
methods applied in each production facility. The normal frequency of these verifications
shall be one every two years.
9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a vehicle type pursuant to this Regulation may be
withdrawn if the requirements set forth above are not met.
9.2. If a Contracting Party to the Agreement applying this Regulation withdraws an approval it
has previously granted, it shall forthwith so notify the other Contracting Parties applying this
Regulation, by means of a communication form conforming to the model in Annex 1 to this
Regulation.
10. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a vehicle type approved in
accordance with this Regulation, he shall so inform the authority which granted the
approval. Upon receiving the relevant communication that authority shall inform thereof the
other Parties to the 1958 Agreement applying this Regulation by means of a communication
form conforming to the model in Annex 1 to this Regulation.

ANNEX 1
COMMUNICATION
(Maximum format: A4 (210 × 297mm))
Issued by:
Name of administration
.....................................
.....................................
.....................................
Concerning:
Approval granted
Approval extended
Approval refused
Approval withdrawn
Production definitively discontinued
of a vehicle type with regard to its sound emission pursuant to Regulation No. XX
Approval No.: .......................................................... Extension No.: ....................................................
SECTION I
0.1. Make (trade name of manufacturer): .............................................................................................
0.2. Vehicle type .....................................................................................................................................
0.3. Means of identification of type if marked on the vehicle: ............................................................
0.3.1. Location of that marking: ................................................................................................................
0.4. Category of vehicle ......................................................................................................................
0.5. Propulsion principle (PEV/HEV/FCV/FCHV): .................................................................................
0.6. Company name and address of manufacturer: ..............................................................................
0.7. Names and Address(es) of assembly plant(s): ..............................................................................
0.8. Name and address of the manufacturer's representative (if any): .................................................

Addendum to the Communication Form No …
Technical Information
0.
General
0.1.
Make (trade name of manufacturer):
0.2.
Means of identification of type, if marked on the vehicle
0.2.1.
Location of that marking:
0.3
Category of vehicle:
0.4.
Company name and address of manufacturer:
0.5.
Name and address of the manufacturer's representative (if any):
0.6.
Name(s) and Address(es) of assembly plant(s):
1.
Additional information
1.1.
Power plant
1.1.1.
Propulsion principle (PEV/HEV/FCV/FCHV):
1.1.2.
Manufacturer of the engine(s):
1.1.3.
Manufacturer's engine code(s):
1.2.
Description of AVAS (if applicable): .............
1.2.1
Pause switch (yes/no)
1.2.2.
Sound at Stationary (yes/no)
1.2.3.
No. of driver selectable sounds (1/2/3/…)
2.
Test results
2.1.
Sound level of moving vehicle: .............. dB(A) at 10km/h
2.2.
Sound level of moving vehicle: .............. dB(A) at 20km/h
2.3.
Sound level of moving vehicle: .............. dB(A) in reversing
2.4.
Frequency shift: .......... % /km/h
3.
Remarks

2.6. Mass in running order
3. Power plant
minimum and maximum: ...........................................................................................................
3.1. Manufacturer of the engine(s):
3.1.1. Manufacturer's engine code(s) (as marked on the engine(s), or other means of
identification): ............................................................................................................................
3.3. Electric motor
3.3.1. Type of the electric motor (winding, excitation):
3.4. Engine or motor combination:
3.4.4. Electric motor (describe each type of electric motor separately)
3.4.4.1. Make: ........................................................................................................................................
3.4.4.2. Type: .........................................................................................................................................
3.4.4.3. Maximum power: ....... kW
6. Suspension
6.6. Tyre size
6.6.2. Upper and lower limits of rolling radii
6.6.2.1. Axle 1: .......................................................................................................................................
6.6.2.2. Axle 2: .......................................................................................................................................
6.6.2.3. Axle 3: .......................................................................................................................................
6.6.2.4. Axle 4: .......................................................................................................................................
etc.
9. Bodywork
9.1. Type of bodywork:
9.2. Materials used and methods of construction:
12. Miscellaneous
12.5. Details of materials and components influencing the sound emission of the vehicle (if not
covered by other items): ...........................................................................................................

ANNEX 2
ARRANGEMENTS OF THE APPROVAL MARKS
Model A
(See Paragraph 5.4. of this Regulation)
a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has, with regard to
its audibility, been approved in the Netherlands (E 4) pursuant to Regulation No. XXX under approval
No. 002439.
The first two digits of the approval number indicates that Regulation No. XX already included the
00 series of amendments when the approval was granted.
Model B
(See Paragraph 5.5. of this Regulation)
a = 8mm min.
The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved
in the Netherlands (E 4) pursuant to Regulations Nos. XXX and 33. The approval numbers indicate
that, at the dates when the respective approvals were granted, Regulation No. XXX included the
00 series of amendments while Regulation No. 33 included the 01 series of amendments.

1.3. Meteorological Instrumentation
The meteorological instrumentation used to monitor the environmental conditions during the
test shall meet the specifications of:
(a)
(b)
(c)
(d)
±1°C or less for a temperature measuring device;
±1.0m/s for a wind speed-measuring device;
±5hPa for a barometric pressure measuring device;
±5% for a relative humidity measuring device.
2. ACOUSTIC ENVIRONMENT, METEOROLOGICAL CONDITIONS, AND BACKGROUND
NOISE
2.1. Test Site
2.1.1. General
The specifications for the test site provide the necessary acoustic environment to carry out
the vehicle tests documented in this regulation. Outdoor and indoor test environments that
meet the specifications of this regulation provide equivalent acoustic environments and
produce results that are equally valid.
2.1.2. Outdoor Testing
The test site shall be substantially level. The test track construction and surface shall meet
the requirements of ISO 10844:2014.
Within a radius of 50m around the centre of the track, the space shall be free of large
reflecting objects such as fences, rocks, bridges or buildings. The test track and the surface
of the site shall be dry and free from absorbing materials such as powdery snow, or loose
debris.
In the vicinity of the microphones, there shall be no obstacle that could influence the
acoustic field and no person shall remain between the microphone and the noise source.
The meter observer shall be positioned so as not to influence the meter reading.
Microphones shall be located as specified in Figures 1.

2.2. Meteorological Conditions
Metrological conditions are specified to provide a range of normal operating temperatures
and to prevent abnormal readings due to extreme environmental conditions.
A value representative of temperature, relative humidity, and barometric pressure shall be
recorded during the measurement interval.
The meteorological instrumentation shall deliver data representative for the test site and
shall be positioned adjacent to the test area at a height representative of the height of the
measuring microphone.
The measurements shall be made when the ambient air temperature is within the range
from 5°C to 40°C.
The ambient temperature may of necessity be restricted to a narrower temperature range
such that all key vehicle functionalities that can reduce vehicle noise emissions
(e.g. start/stop, hybrid propulsion, battery propulsion, fuel-cell stack operation) are enabled
according to manufacturer’s specifications.
The tests shall not be carried out if the wind speed, including gusts, at microphone height
exceeds 5m/s, during the measurement interval.
2.3. Background Noise
2.3.1. Measurement Criteria for A-weighted Sound Pressure Level
The background, or ambient noise, shall be measured for a duration of at least 10s. A 10s
sample taken from these measurements shall be used to calculate the reported background
noise, ensuring the 10s sample selected is representative of the background noise in
absence of any transient disturbance. The measurements shall be made with the same
microphones and microphone locations used during the test.
When testing in an indoor facility, the noise emitted by the roller-bench, chassis
dynamometer or other test facility equipment, without the vehicle installed or present,
inclusive of the noise caused by air handling of the facility and vehicle cooling, shall be
reported as the background noise.
The recorded maximum A-weighted sound pressure level from both microphones during the
10s sample shall be reported as the background noise, L , for both left and right
microphones.
For each 10s sample at each microphone, the maximum to minimum range of the
background noise, ∆L , shall be reported.
The one-third-octave frequency spectrum, corresponding to the reported maximum level of
background noise in the microphone with the highest background level, shall be reported.
As an aid for measurement and reporting of background noises see flowchart in Figure 4 of
the Appendix to this Annex.

2.3.3. Background Noise Requirements when Analysing in One-third-octave Bands
When analysing one-third octaves according to this regulation, the level of background
noise in each one-third octave of interest, analysed according to Paragraph 2.3.1, shall be
at least 6dB(A) below the measurement of the vehicle or AVAS under test in each
one-third-octave band of interest. The A-weighted sound pressure level of the background
noise shall be at least 10dB(A) below the measurement of the vehicle or AVAS under test.
Background compensation is not permitted for one-third octave band measurements.
As an aid for background noise requirements when analysing in one-third-octave bands see
flowchart in Figure 6 of the Appendix to this Annex.
3. TEST PROCEDURES FOR VEHICLE SOUND LEVEL
3.1. Microphone Positions
The distance from the microphone positions on the microphone Line PP’ to the
perpendicular reference Line CC’ as specified in Figure 1 and 2 on the test track or in an
indoor test facility shall be 2.0m ± 0.05m.
The microphones shall be located 1.2m ± 0.02m above the ground level. The reference
direction for free field conditions as specified in IEC 61672-1:2013 shall be horizontal and
directed perpendicularly towards the path of the vehicle Line CC’.
3.2. Conditions of the Vehicle
3.2.1. General Conditions
The vehicle shall be representative of vehicles to be put on the market as specified by the
manufacturer in agreement with the technical service to fulfil the requirements of this
Regulation.
Measurements shall be made without any trailer, except in the case of non-separable
vehicles.
In the case of HEVs/FCHVs, the test shall be carried out in the most energy efficient mode
so to avoid the restart of the ICE, e.g. all audio-, entertainment-, communication- and
navigation-systems shall be switched off.
Before the measurements are started, the vehicle shall be brought to its normal operating
conditions.
3.2.2. Battery State of Charge
If so equipped, propulsion batteries shall have a state-of-charge sufficiently high to enable
all key functionalities according to the manufacturer’s specifications. Propulsion batteries
shall be within their component-temperature window to enable all key functionalities that
could reduce vehicle sound emissions. Any other type of rechargeable energy storage
system shall be ready to operate during the test.

3.3.2.1. Constant Speed Tests in Forward Motion
For a vehicle tested in an outdoor facility, the path of the centreline of the vehicle shall follow
Line CC’ as closely as possible with constant speed v throughout the entire test. The front
plane of the vehicle shall pass from the Line AA’ at the start of the test and the rear plane of
the vehicle shall pass from the Line BB’ at the end of the test, as shown in Figure 1a. Any
trailer, which is not readily separable from the towing vehicle, shall be ignored when
considering the crossing of the Line BB’.
A vehicle tested in an indoor facility, shall be located with the front plane of the vehicle on
the PP' Line as shown in Figure 2a. The vehicle shall maintain a constant test speed, v for
at least 5s.
For constant speed test condition of 10km/h, the test speed v shall be 10km/h ± 2km/h.
For constant speed test condition of 20km/h, the test speed v shall be 20km/h ± 1km/h.
For automatic transmission vehicles, the gear selector shall be placed as specified by the
manufacturer for normal driving.
For manual transmission vehicles, the gear selector shall be placed in the highest gear
which can achieve the target vehicle speed with constant engine speed.
3.3.2.2. Constant speed tests simulated by an external signal to the AVAS with the vehicle in
standstill condition
A vehicle tested in an indoor or outdoor facility, shall be located with the front plane of the
vehicle on the PP' Line as shown in Figure 2b. The vehicle shall maintain a constant
simulated test speed, v for at least 5s.
For constant speed test condition of 10km/h, the simulated test speed v shall be
10km/h ± 0.5km/h.
For constant speed test condition of 20km/h, the simulated test speed v shall be
20km/h ± 0.5km/h
3.3.3. Reversing Tests
These tests may be conducted with the vehicle in rearward motion or with the vehicle speed
simulated by an external signal to the AVAS or with the vehicle in standstill condition.

3.4. Measurement Readings and Reported Values
At least four measurements for each test condition shall be made on both sides of the
vehicle.
The first four valid consecutive measurement results for each test condition, within 2.0dB(A)
per side, allowing for the deletion of non-valid results, shall be used for the calculation of the
intermediate or final result.
If a sound peak obviously out of character with the general sound pressure level is
observed, that measurement shall be discarded. For measurement of a vehicle in motion
(forward and reversing) outdoor, the maximum A-weighted sound pressure level indicated
during each passage of the vehicle between AA’ and PP’ (L ) shall be noted for each
microphone position, to the first significant digit after the decimal place (for example XX,X).
For measurement of a vehicle in motion indoor and in standstill (forward and reversing), the
maximum A-weighted sound pressure level indicated during each period of 5s for each
microphone position, L , shall be noted, to the first significant digit after the decimal place
(for example XX,X).
L shall be corrected according to Paragraph 2.3.2 to obtain L .
For each maximum A-weighted sound pressure level, the corresponding one-third-octave
spectrum shall be reported for each microphone position. No background correction shall be
applied to any measured one-third octave result.
3.5. Data Compilation and Reported Results
For each test condition described in Paragraph 3.3., the background corrected results,
L , and the corresponding one third octave spectra of both sides of the vehicle
individually shall be arithmetically averaged and rounded to the first decimal place.
The final A-weighted sound pressure level results L , L and L to be reported are
the lower values of the two averages of both sides, rounded to the nearest integer. The final
one third octave spectra to be reported are the spectra corresponding to the same side as
the reported A-weighted sound pressure level.

4.3. Test Methods
4.3.1. Method (A) – Outdoor Facility and Vehicle in Motion
The vehicle shall be operated in the same outdoor test facility and according to the same
general operating condition as for the vehicle constant speed testing (Paragraph 3.3.2).
The vehicle sound emission shall be measured at target speeds of 5km/h to 20km/h in steps
of 5km/h with a tolerance of +/- 2km/h for the speed of 10km/h or less and of +/- 1km/h for
any other speeds. The speed of 5km/h is the lowest target speed. If the vehicle cannot be
operated at this speed within the given precision, the lowest possible speed below 10km/h
shall be used instead.
4.3.2. Method (B) and Method (D) – Outdoor/Indoor Facility and Vehicle in Standstill
The vehicle shall be operated in a test facility where the vehicle can accept an external
vehicle speed signal to the AVAS simulating vehicle operation. The microphone locations
shall be as for the complete vehicle test conditions as specified in Figure 2a. The front plane
of the vehicle shall be placed on Line PP’.
The vehicle sound emission shall be measured at simulated speeds of 5km/h to 20km/h in
steps of 5km/h with a tolerance of +/- 0.5km/h for each test speed.
4.3.3. Method (C) – Indoor Facility and Vehicle in Motion
4.3.4. Method (E)
The vehicle shall be installed in an indoor test facility where the vehicle can operate on a
chassis dynamometer in the same manner as outdoors. All microphone locations shall be as
for the vehicle test conditions as specified in Figure 2a. The front plane of the vehicle shall
be placed on Line PP’.
The vehicle sound emission shall be measured at target speeds of 5km/h to 20km/h in steps
of 5km/h with a tolerance of +/- 2km/h for the speed of 10km/h or less and of +/- 1km/h for
any other speeds. The speed of 5km/h is the lowest target speed. If the vehicle cannot be
operated at this speed within the given precision, the lowest possible speed below 10km/h
shall be used instead.
The AVAS shall be mounted rigidly in an indoor facility, by means of the equipment
indicated by the manufacturer. The microphone of the measuring instrument shall be placed
at 1m distance from the AVAS in the direction where the subjective sound level is greatest
and placed at a height of approximately the same level as the sound radiation of the AVAS.
The sound emission shall be measured at simulated speeds of 5km/h to 20km/h in steps of
5km/h with a tolerance of +/- 0.5km/h for each test speed.

Target speed
Table 4
Analysis of the Shifted Frequency per Target Condition per Side
Test run per
target
condition
Reported speed
(average per
sample segment)
Determined
frequency of
interest
(f )
Reported Speed
per target
condition
(average of the
reported speeds)
Reported
frequency of
interest per
target condition
(f )
km/h No km/h Hz km/h Hz
5
10
15
20
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
For all other test methods the derived frequency spectrum shall directly be used for the
further calculation.

Table 5
Report Table, to be Completed for Each Frequency Analysed
Test Results at Target Speeds
5km/h
(Reference)
10km/h 15km/h 20km/h
Reported Speed
km/h
Frequency, f
, Left Side
Hz
Frequency, f
, Right Side
Hz
Frequency Shift, Left Side
%
n.a.
Frequency Shift, Right Side
%
n.a.

Figure 3
Minimum Space to be Qualified as Semi-Anechoic Chamber
Figure 4
Determination of the Range of Background Noise

Figure 6
Background Noise Requirements for Analysis in One-third-octave Bands

Figure 7b
Test Procedures for Measurement of Frequency Shift, Method A

Regulation on the Approval of Quiet Road Transport Vehicles (QRTV) - Proposal.