IS 13937-3: Statistical Methods for Determining and Verifying Stated Noise Emission Values of Machinery and Equipment, Part 3: Simple (Transition) Method for Stated Values for Batches of Machines

8 Pages·1994·1.1 MB·English

by  Bureau of Indian Standards

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IS 13937-3 (1994): Statistical Methods for Determining and
Verifying Stated Noise Emission Values of Machinery and
Equipment, Part 3: Simple (Transition) Method for Stated
Values for Batches of Machines [ETD 15: Rotating Machinery]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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IS 13937(Part3) : 1994
ISO 7574/3:1985

standard
Indian
STATISTICAL METHODS FOR DETERMINING
AND VERIFYING STATED NOISE EMISSION
VALUES OF MACHINERY AND EQUIPMENT
PART 3 SIMPLE ( TRANSITION ) METHOD FOR STATED VALUES FOR
BATCHES OF MACHINES
UDC 534’835”46:519”23

0 61S 1994
6UREAUOFINDIANST AN DARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
March 1994 PriceGroup1
.
!
Acoustics Sectional Committee, LTD 5
NATIONAL FOREWORD
This Indian Standard (-Part 3 ) which is identical with ISO 7574/3 :1985 ‘Acoustics – Statistical
methods for determining and verifying stated noise emission values of machinery and equipment.
Part 3 Simple ( transition ) method for stated values for batches @f machines’ issued by the
International Organization for Standardization ( ISO ) was adopted by the Bureau of Indian
Standards on the recommendation of the Acoustics Sectional Committee ( LTD 5 ) and approval
of the Electronics and Telecommunication Division Council.
The text of ISO Standard has been approved as suitable for publication as Indian Standard without
deviations. Certain conventions are, however, not identical to those used in Indian Standards.
Attention is particularly drawn to the following:
a) Wherever the words ‘International Standard’ appear referring to this standard, -they
should be read as ‘Indian Standard’.
CROSS REFERENCES
In thi’s Indian Standard, the following International Standards are referred to, Read in their
respective place the following:
International Standard Indian Standard Degree of
Correspondence
IEC 651: 1979 IS 9779:1981 Technically equivalent
Sound level meter Specification for sound level meter
ISO 7574/1 :1985 IS 13937 ( Part 1) :1993 Identical
Acoustics –Statistical methods Statistical methods for determin-
for determining and verifying ing and verifying stated noise
stated noise emission values emission values of machinery
of machinery and equipment and equipment Part 1 General
Part 1 General considerations considerations and definitions
and definitions
ISO 7574/4 :1985 IS 13937 ( Part 4 ) :1993 Identical
Acoustics—Statistical methods Statistical methods for determin-
for determining and verifying ing and verifying stated noise
stated noise emission values emission values of machinery

of machinery and equipment and equipment Part 4 Methods
Part 4 Methods for stated values for stated values for batches of
for batches of machines machines
The Technical committee responsible for ‘the preparation of this standard has reviewed the
provisions of the following International publications and has decided that they are acceptable for
use in conjunction with this standard:
ISO 3741 Acoustics — Determination of sound power levels of noise sources — Precision
methods for broad-band sources in reverberation rooms
ISO 3742 Acoustics — Determination of sound power levels of noise sources — Precision
methods for discrete-frequency and narrow-band sources in reverberation rooms
ISO 3743 Acoustics — Determination of sound power levels of noise sources — Engineering
methods for special reverberation test rooms
ISO 3744 Acoustics — Determination of sound power levels of noise sources — Engineering
methods for free-field conditions over a reflecting plane
ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision
methods for anechoic and semi-anechoic rooms
ISO 3746 Acoustics — Determination of sound power levels of noise sources — Survey
method
IS 13937( Part3) :1994
ISO 7574/3:1985
IndianSturdml
STATISTICAL METHODS FOR DETERMINING
AND VERIFYING STATED NOISE EMISSION
VALUES OF MACHINERY AND EQUIPMENT
PART 3 SIMPLE ( TRANSITION ) METHOD FOR STATED VALUES FOR
BATCHES OF MACHINES
o Introduction ISO 3743, Acoustics — Determination of sound
power levels of noise sources — Engineering
A general introduction to the four-part series methods for special reverberation test rooms.
of ISO 7574 is given in ISO 7574/10
ISO 3744, Acoustics — Determination of sound
For the purposes of this part of 1S0 7574, the power levels of noise sources — Engineering
term “labelled value” stands for all kinds of methods for free-field conditions over a reflect-
stated values ( e g. information on a label, the ing plane.
upper noise limit set by an authority, the
ISO 3745, Acoustics — Determination of sound
agreed contract value ) for which the methods
power levels of noise sources — Precision
may be applied.
methods for anechoic and semi. anechoic
1 Scope and field of application rooms,
This part of ISO 7574 is derived from ISO 3746, Acoustics — Determination of sound
power levels of noise sources — Survey
ISO 7574/4. It provides guidelines for deter-
method.
mining the Iabelled value, LC,by the Iabeller
and specifies a simple method for verifying ISO 7574/1, Acoustics — Statistical methods
compliance of the noise emissions of a batch for determining and verifying stated noise
[ lot ) of machinerv or eaui~ment with its
emission values of machinery and equipment —
(abel~ed value, Lo. This method may be used
Part 1: General considerations and definitions.
when a specific noise Iabelling code ( in accor-
dance with clause 6 of ISO 7574/4) specifying ISO 757414, Acoustics — Statistical methods
the reference standard deviation, sample size for determining and verifying stated noise
and sampling procedure for the family of emission values of machinery and equipment —
machines, does not yet exist. If a specific Part 4: Methods for stated values for batches

noise label ling code exists, it shall be used, of machines.

in which case reference to this part of
ISO 7574 shall not be made. 3 Definitions
This part of ISO 7574 should preferably be For the purposes of this part of ISO 7574, the
used only by agreement, e.g. as reached in definitions given in ISO 7574/1 apply.
the standards relating to the relevant machi-
nery industry or in a contract. 4 General
This part of ISO 7574 does not deal with the
When checking compliance of a batch with its
consequences that ensue if the stated value
Iabelled value, this part of ISO 7574 works on
is not confirmed as verified for a batch of
the principle that the Iabelled value indicates
machines.
the limit below which a specified large pro-
2 References portion of the noise emission values of the
batch shall lie. This proportion accounts for
ISO3741, Acoustics — Determination of sound both the variability between the machines and
power levels of noise sources — Precision the random measurement errors occurring
methods for broad-band sources in reverbera- under reproducibility conditions ( see 3.17 in
tion rooms.
1s07574/1 ),
ISO 3742, Acoustics — Determination of sound
power levels of noise sources — Precision NOTE — In the application of this part of ISO 7574,
it is assumed that all measurements will be perfor-
methods for discrete-frequency and narrow-
med by a testing laboratory which has appropriate
band sources in reverberation rooms. test facilities and trained staff.
1
IS 13937( Part3) :1994
ISO 7574/3:1985
5 Guidelines for the determination of 6 Verifying the Iabelled value for a.
the Iabelled value, L,, by the Iabeller batch of machines
As the determination of the Iabelled value for If no special noise Iabeliing code exists for
a batch of machines is the sole responsibility the specific family of machines to be verified,
of the Iabeller, this clause is given for guid- verification of the Iabelled value, Lc, is
ance only. then carried out as follows:
The measured values of individual machines, a) A sample size of n = 3 is taken at ran-
Li*, of the relevant batch shall be determined dom from the batch under consideration.
in accordance with the specific measurement
b) The measured values, Li, are determi-
test code for the specific family of machines.
ned in accordance with the specific
( The asterisk in the symbol is used here to
measurement test code for the specific
differentiate between measurements in con-
family of machines, or, if no such code
formity with this clause and those in confor-
exists, in accordance with ISO 3741,
mity with clause 6 ).
ISO 3742, ISO 3743, ISO 3744 or ISO
NOTES 3745]) using the same installation and
1 If such a specific measurement test code does not operating conditions as specified in
exist, the methods specified in ISO 3741, ISO 3742, clause 5, fi shall not be rounded prior
ISO 3743, ISO 3744 and ISO 37451) may be used if the to statistical calculations.
installation and operating conditions typical of
normal use are clearly stated o agreed.
c) The mean value is given by
2 if the specific measurement test code for the
family of machines provides more than one mode of 3
operation in normal use, the mocfr?yielding the
highest value of Z* or the mode agreed upon in the
relevant machinery industry or in the contract should
i=l
be used to determine Lo. The installation and operat-
ing conditions and the measurement test code used
d) The rules governing the decision shall
should be clearly stated.
be as follows:
The mean value, ~$, is calculated from the
If ~< LO—2 dB, the Iabelled value is
measured values, Li*, of the individual
confirmed as verified for the batch;
machines in a sample.
If ~> LC— 2 dB, the Iabelled value is
The Iabelled value, LO of a batch of machines
not confirmed as verified for the batch.
may be determined by adding a constant, K,
to the mean value of the sample, Z*: NOTES
Lc=~*+K 1 The above procedure is equivalent to the procedure
outlined in ISO 7574/4 for:
In general, it is preferable to choose a sample
size as large as practicable in determinations —a single sampling inspection,

of the mean value in orde r to reduce the — a sample size of n = 3, and

uncertainties associated with th e noise source.
— a reference standard deviation of aM = 3“5 dB.
The constant, K, is a positive number, deter-
mined by the Iabeller on the basis of the The above procedure is applicable for reproducibility
definition of the Iabelled value ( see clause4 ) conditions ( see 3.17 in ISO 7574/1 ), and for repeat-
with respect to the verification procedure of ability conditions ( see 3.16 in 1S07574/1 ). It should
be ascertained that no outstanding systematic error
clause 6. According to clause 6, the value of
of measurement results is connected with relevant
K should be greater than or equal to 5 dB.
laboratories.
This value is given for guidance only. More
guidance is given in clause 5 of ISO 7574/4 2 If the actual total standard deviation for this
assuming that (TM = 3“5 dB. specific batch of machines differs from UM = 3“5 dB,
see ISO 7574/4 clause 5, and annexes A and B,
NOTE — Testing may be necessary from time to
time in order to ensure that the Iabelled value con- 7 information to be given
tinues to be correct. Testing ISalso required when-
ever physical changes are made to the production The specific measurement test code for the
machines that may affect their noise emissions.
specific family of machines, or, if no such
—
code exists, ISO 3741, ISO 3742, ISO 3743,
I)This does not preclude the use of other inter-
ISO 3744 or ISO 3745, and the installation and
national Standards, e.g. ISO 3746, which may form
the basis of the special measurement test code. operating conditions used shall be stated.
2
. ,
Bureau of Indian Standards
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and attending to connected matters in the country.
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Review of Indian Standards
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edition.
This Indian Standard has been developed from Doc : No. LTD 05 ( 1668 ).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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