ISO 4412-3:1991

SLOVENSKI STANDARD
01-december-1998
)OXLGQDWHKQLND+LGUDYOLND3RVWRSHNXJRWDYOMDQMDUDYQL]UDþQHJDKUXSDGHO
ýUSDONHPHWRGDVSDUDOHORSLSHGQRUD]PHVWLWYLMRPLNURIRQRY
Hydraulic fluid power -- Test code for determination of airborne noise levels -- Part 3:
Pumps -- Method using a parallelepiped microphone array
Transmissions hydrauliques -- Code d'essai pour la détermination du niveau de bruit
aérien -- Partie 3: Pompes -- Méthode employant un étalage des microphones en
parallélépipède
Ta slovenski standard je istoveten z: ISO 4412-3:1991
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
23.100.10 +LGUDYOLþQHþUSDONHLQPRWRUML Pumps and motors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
STANDARD
First edition
1991-08-15
Hydraulic fluid power - Test code for
determination of airborne noise levels -
Part 3:
Pumps - Method using a parallelepiped
microphone array
Transmissions hydrauliques - Code d ’essai pour la determination du
niveau de bruit a&en -
Partie 3: Pompes - MHhode employant un eta/age des microphones en
parall&pip~de
Reference number
IS0 4412-3:1991(E) ,.;
. .
- IS0 4412=3:1991(E)
Contents
Page
I Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Normative references
. . . . . . . . . I
3 Definitions _.I.
4 Measurement uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
5 Test environment
6 Instrumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . 3
9 Location and number of sound measurement points
.,. 4
10 Test procedure
11 Calculation of surface sound pressure levels and sound power
levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
12 information to be recorded
13 Test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 Identification statement (Reference to this part of IS0 4412)
Annexes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A Errors and classes of measurement
B Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
0 is0 1991
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without
permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
IS0 4412-3:1991(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. IS0 collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard IS0 4412-3 was prepared jointly by Technical
Committees ISO/TC 131, Fluid power systems, Sub-Committee SC 8,
Product fesfinq and confaminafion confrol and ISO/TC 43, Acoustics.
.
IS0 4412 consists of the following parts, under the general title Hydraulic
f7uid power - Test code for determination of airborne noise levels:
- Part 1: Pumps
- Part 2: Motors
- Part 3: Pumps - Method using a parallelepiped microphone array
Annex A forms an integral part of this part of IS0 4412. Annex B is for
information only.
. . .
III
’ IS0 4412=3:1991(E)
Introduction
In hydraulic fluid power systems, power is transmitted and controlled
through a liquid under pressure in a closed circuit. Pumps are compo-
nents which convert rotary mechanical power into fluid power. During
the process of converting mechanical power into hydraulic fluid power,
airborne noise, fluid-borne vibrations and structure-borne vibrations are
radiated from the pump.
The airborne noise level of a hydraulic fluid power pump is an important
consideration in component selection. The noise measurement tech-
nique should, therefore, be such as to yield accurate appraisals of these
airborne noise levels. The determination of noise levels is complicated
by the interactions which occur during noise measurements. The fluid-
borne and structure-borne vibrations from the pump can be transmitted
to the circuit and ultimately give rise to background airborne noise lev-
els which could affect the determination of the pump airborne noise
levels.
The procedures described in this part of IS0 4412 are intended to
measure only the airborne noise radiated directly from the pump under
test.
This part of IS0 4412 closely follows the methods described in the two
other parts, but allows the use of alternative pump mounting and drive
configurations which are simpler and cheaper to implement in an
anechoic chamber. Much of the guidance given in IS0 44j2-1:1991, an-
nex C, is equally applicable to this part of IS0 4412. The data obtained
have been shown to be sufficiently accurate in engineering terms for
A-weighted and one-third octave noise measurements, in decibels.
This part of IS0 4412 may also be applied to the testing of motors.
iv
INTERNATIONAL STANDARD IS0 441203:1991 (E)
Hydraulic- fluid power - Test code for determination of
airborne noise levels -
Part 3:
Pumps - Method using a parallelepiped microphone array
IEC and IS0 maintain registers of currently valid ln-
1 Scope
ternational Standards.
This part of IS0 4412 describes procedures for the
IS0 3448:1975, lndusfriaI liquid lubricants - IS0 vis-
determination of the sound power levels of a hy-
cosity classification.
draulic fluid power pump, under controlled con-
ditions of installation and operation, suitable for
IS0 3744:1981, Acoustics - Determination of sound
providing a basis for comparing the noise levels of
power levels of noise sources - Engineering mefh-
pumps in terms of
ods for free-field conditions over a renecfing plane.
- A-weighted sound power level;
IS0 5598:1985, Fluid power systems and components
- Vocabulary.
-
one-third octave band power level.
IS0 6743-4:1982, Lubricants, industrial oils and re-
From these sound power levels, if required, refer-
lated products (class L) - Classification - Part 4:
ence sound pressure levels may be calculated for
Family H (Hydraulic systems).
reporting purposes (see clause 11).
For general purposes, the frequency range of inter-
IEC 651:1979, Sound level meters.
est includes the one-third octave bands with centre
frequencies between 100 Hz and 10000 Hz?
3 Definitions
This part of IS0 4412 is applicable to all types of
hydraulic fluid power pumps operating under
For the purposes of this part of IS0 4412, the defi-
steady-state conditions, irrespective of size, except
nitions given in IS0 5598 and the following defi-
for any limitations imposed by the size of the test
nitions apply. It is accepted that the latter definitions
environment (see clause 3).
may differ from those in other specific International
Standards.
2 Normative references
3.1 free sound field: Sound field in a homogeneous,
isotropic medium free of boundaries.
The following standards contain provisions which,
through reference in this text, constitute provisions
NOTE 1 In practice, it is a field in which the effects of
of this part of IS0 4412. At the time of publication, the boundaries are negligible over the frequency range
of interest.
the editions indicated were valid. All standards are
subject to revision, and parties to agreements based
on this part of IS0 4412 are encouraged to investi- 3.2 free field over two reflecting planes: Field
gate the possibility of applying the most recent edi- produced by a source in the presence of two mutu-
tions of the standards indicated below. Members of ally perpendicular reflecting planes.
1) I Hz = 1 s--i
’ IS0 4412-3:1991(E)
3.3 anechoic room: Test room having boundaries
which absorb essentially all of the incident sound Table 1 - Standard deviations of sound power level
energy over the frequency range of interest, thereby determinations
affording free-field conditions over the measurement
Standard deviation, dB,
surface.
for one-third octave band centre frequencies
I
I
3.4 mean-square sound pressure: The sound
pressure averaged in space and time on a mean-
square basis.
570 TO TO
NOTE 2 In practice, this is estimated by space and time
I
I I
I
I
averaging over a finite path length or over a number of
fixed microphone positions.
The standard deviations given in table I include the
effects of allowable variations in the positioning of
3.5 mean sound pressure level (I.,,): Ten times the
the measurement points and in the selection of any
logarithm to the base IO of the ratio of the mean-
prescribed measurement surface, but exclude vari-
square sound pressure to the square of the refer-
ations in the sound power output of the source from
ence sound pressure, in decibels (dB).
test to test.
NOTE 3 The weighting network or the width of the fre-
NOTE 5 The A-weighted sound power level will in most
quency band used should always be indicated; for exam-
practical cases be determined with a standard deviation
ple, A-weighted sound pressure level, octave band sound
of approximately 2 dB.
pressure level. The reference sound pressure is 20 LIPa?
5 Test environment
3.6 sound power level I,,: Ten times the logarithm
Tests shall be conducted in an environment gener-
to the base IO of the ratio of a given sound power to
ally in accordance with that described in IS0 3744
the reference sound power, in decibels (dB).
and which provides free-field conditions over two
mutually perpendicular reflecting planes, both of
NOTE 4 The weighting network or the width of the fre-
quency band used should always be indicated. The refer- which extend beyond the projected area of the
ence sound power is 1 pW3).
microphone measuring array.
Calibrate the acoustic test environment thus formed
3.7 volume of source under test: Vol
ume of the en-
and ascertain the environmental corrections for
velope of the whole pump under test.
each frequency band of interest, using the pro-
cedures described in IS0 3744:1981, annex A.
3.8 reference box: Hypothetical reference surface
which is the smallest rectangular parallelepiped that
just encloses the pump and any large directly-
6 Instrumentation
attached appendages (such as valve bodies or con-
trol handwheels) and which terminates on the
6.1 The instrumentation used to measure fluid
reflecting planes.
flow, fluid pressure, pump speed and fluid tempera-
ture shall be in accordance with the recommen-
dations for “industrial class” accuracy of testing; i.e.
4 Measurement uncertainty
class C given in annex A.
With the exception of the measurement environment
6.2 The instrumentation used for acoustical
specified in clause 5, use methods of measurement
measurements shall be in accordance with IEC 651.
which tend to result in standard deviations which
This instrumentation shall be in accordance with
are equal to or less than those given in table 1. To
IS0 3744 for both performance and calibration; i.e.
meet this requirement, use the engineering methods
type 2 instruments for engineering (grade 2)
given in IS0 3744: 1981, clause 4 and annex A.
measurements.
2) 1 LlPa = 10-G N/m2
3) 1 pw = 10-Q w
IS0 441203:1991 (E)
least 15 m of hose shall be used to meet this re-
7 Installation conditions
quirement.
7.1 Pump location
7.4.6 A stable load valve shall be used.
The pump shall be located with its mounting flange
NOTE 6 Unstable load valves in the discharge line can ’
flush with one reflecting plane. The second reflecting
generate and transmit noise through the fluid and piping
plane shall be arranged so as to intersect the first
which can emerge as airborne sound at the pump.
at right angles as close to the pump as practicable.
7.4.7 The load valve shall be positioned as far as
possible from the pump, preferably outside the test
7.2 Pump mounting
room, to minimize interaction. The load valve shall
be located close to the pump only when adequate
7.2.1 The pump mounting shall be constructed so
control o
...